Release v1.0.0

This is the first releas of dpg-map, an AI coded dearpygui map widget
built due to a lack of time to build it myself.

It features multi-widget abilities, with layers, overlays etc

AGENTS.md

@@ -1,74 +0,0 @@
-# AGENTS.md
-
-## Current status
-
-Step 4 complete.
-
-## Completed steps
-
-Step 1 - Public API contract and pure core.
-Step 2 - Thread-safe state, commands, overlays, and cache model.
-Step 3 - Widget shell, sizing system, and GUI-thread frame pump.
-Step 4 - Tile manager, persistent cache, and asynchronous loading.
-
-## Current step
-
-Step 5 - Interaction: pan, zoom, and view commands.
-
-## Design decisions
-
-- Package is managed with uv.
-- Public import is `import dpg_map as dpgm`.
-- Dear PyGui calls are GUI-thread-only.
-- Runtime public calls enqueue commands or update logical state.
-- Overlay updates must not reset center/zoom.
-- The widget uses child_window + measured-size drawlist.
-- Tiles use a memory cache and persistent disk cache.
-- Tile providers are interchangeable.
-
-## Known issues
-
-None yet.
-
-## Commands used
-
-- Read `STEPS.md`, `FEATURES.md`, and `ARCHITECTURE.md`.
-- Created initial package, examples, tests, and agent-log structure.
-- Implemented public exports, exceptions, common types, tile provider registry, projection helpers, cache dataclasses, and GUI-dependent API stubs.
-- Added Step 1 tests for imports, providers, projection, and cache dataclasses.
-- Implemented global configuration, logical MapState, map registry, and current map context stack.
-- Implemented DirtyFlags, MapCommand, CommandKind, and coalescing MapCommandQueue.
-- Implemented logical marker, polyline, trajectory, and layer state models.
-- Implemented public runtime overlay/view/layer/provider/cache/debug wrappers against logical state without Dear PyGui calls.
-- Implemented memory cache metadata, disk cache path generation, metadata read/write, disk size scanning, and prune planning.
-- Added Step 2 tests for command coalescing, overlay/view isolation, copied trajectory inputs, coordinate length validation, layer state, disk path generation, and prune ordering.
-- Implemented `map_widget(...)` as a Dear PyGui child-window plus drawlist shell.
-- Implemented GUI-thread renderer frame pump that schedules frame callbacks, drains command queues, measures size, resizes the drawlist, and draws a placeholder background/attribution.
-- Implemented sizing helpers for measured size, last non-zero size preservation, visibility transitions, effective draw size, and resize dirty flags.
-- Implemented map interaction hit-rectangle calculation.
-- Implemented TileID, TileStatus, Tile, visible tile calculation, and TileManager.
-- Implemented asynchronous tile worker queue for disk reads, HTTP fetches, and image decoding.
-- Implemented provider-namespaced persistent cache writes, access metadata updates, clearing, and LRU pruning.
-- Implemented memory tile cache with visible-tile protection and deferred GUI-thread texture deletion.
-- Integrated tile result processing, stale generation/provider rejection, texture creation, and tile drawing into the GUI-thread renderer.
-- Added OpenStreetMap User-Agent warning/fallback and configured examples with example user agents.
-- Added Step 3 examples for basic map, window sizing, child-window sizing, table sizing, and hidden-tab sizing.
-- Added Step 4 cache stress example.
-- Added Step 3 tests for sizing transitions, zero-size preservation, resize dirty flags, command drain ordering, and hit rectangles.
-- Added Step 4 tests for visible tile calculation, stale result rejection, protected memory eviction, and tile image decoding.
-- Ran a Dear PyGui context smoke check for `map_widget` child-window/drawlist creation.
-- Ran `uv run pytest`.
-- Ran `uv run ruff check .`.
-- Ran `uv run ruff format .`.
-- Ran `uv run ruff format --check .`.
-- Ran `uv run pyright`.
-- Ran `uv run pytest`.
-- Ran `uv run ruff check .`.
-- Ran `uv run ruff format .`.
-- Ran `uv run ruff format --check .`.
-- Ran `uv run pyright`.
-- Ran a Dear PyGui context smoke check for `map_widget` child-window/drawlist/texture-registry creation.
-
-## Next action
-
-Implement Step 5.

README.md

@@ -1,51 +1,88 @@
 # dpg-map
 
-`dpg-map` is a Dear PyGui map widget package under rebuild.
-
-The Step 4 tile manager is in place:
+`dpg-map` is a Dear PyGui widget for interactive XYZ raster maps, tile caching, and
+geographic overlays.
 
 ```python
 import dpg_map as dpgm
-
-provider = dpgm.TileProvider(
-    name="custom",
-    url_template="https://example.com/{z}/{x}/{y}.png",
-    attribution="Tiles (c) Example",
-)
-dpgm.register_provider(provider)
-
-with dpgm.map_widget(tag="map", center=(47.9029, 1.9093), zoom=15):
-    dpgm.add_marker("vehicle", lat=47.9029, lon=1.9093)
-
-dpgm.update_marker("vehicle", lat=47.9030, lon=1.9094, map_tag="map")
 ```
 
-Implemented so far:
+The widget is built for telemetry dashboards and internal tools that need maps inside normal
+Dear PyGui layouts. Runtime updates are thread-safe: marker, trajectory, view, provider, and
+cache calls update logical state or enqueue renderer work, while Dear PyGui draw calls stay on
+the GUI thread.
 
-- public package exports
-- tile provider definitions and registry
-- Web Mercator projection helpers
-- thread-safe logical map state and map registry
-- command queue with coalescing for overlay and view updates
-- logical marker, polyline, trajectory, and layer models
-- persistent disk cache paths, metadata, scanning, pruning, and clearing
-- Dear PyGui `child_window` + measured-size `drawlist` widget shell
-- GUI-thread frame pump that drains commands, manages textures, and draws raster tiles
-- sizing helpers that preserve the last non-zero size across hidden layouts
-- interaction hit-rectangle calculation for the measured map area
-- asynchronous tile workers that read disk cache, fetch HTTP, and decode images
-- memory cache with visible-tile protection and GUI-thread texture deletion
+## Install
 
-Overlay drawing is not implemented yet. Step 5 will add pan/zoom interaction and
-view command projection.
+For local development:
 
-Examples:
+```bash
+uv sync
+uv run pytest
+```
+
+From another local project:
+
+```bash
+uv add --editable ../dpg-map
+uv run python -c "import dpg_map as dpgm; print(dpgm.list_providers())"
+```
+
+## Minimal Example
+
+```python
+from typing import Any
+
+import dearpygui.dearpygui as _dpg
+import dpg_map as dpgm
+
+dpg: Any = _dpg
+
+dpgm.configure(user_agent="my-app/0.1 contact@example.com")
+
+dpg.create_context()
+dpg.create_viewport(title="Map", width=900, height=600)
+
+with dpg.window(label="Map", width=-1, height=-1):
+    with dpgm.map_widget(tag="map", center=(47.9029, 1.9093), zoom=15, width=-1, height=-1):
+        dpgm.add_marker("vehicle", lat=47.9029, lon=1.9093, label="Vehicle")
+
+dpg.setup_dearpygui()
+dpg.show_viewport()
+dpg.start_dearpygui()
+dpg.destroy_context()
+```
+
+Run the bundled example:
 
 ```bash
 uv run python examples/basic_map.py
-uv run python examples/sizing_window.py
-uv run python examples/sizing_child.py
-uv run python examples/sizing_table.py
-uv run python examples/hidden_tab.py
-uv run python examples/cache_stress.py
+```
+
+## Documentation
+
+- [Getting Started](docs/GETTING_STARTED.md)
+- [Examples](docs/EXAMPLES.md)
+- [API Reference](docs/API_REFERENCE.md)
+
+Internal rebuild notes, implementation plans, and agent logs live in [codex/](codex/).
+
+## Highlights
+
+- OpenStreetMap provider registered by default as `osm`
+- Custom XYZ tile providers
+- Pan and cursor-centered zoom
+- Markers, polylines, and live trajectories
+- Overlay layers with visibility and z-order controls
+- Memory tile cache and provider-namespaced disk cache
+- Multiple independent map widgets in one Dear PyGui app
+- Background-thread runtime updates for telemetry workloads
+
+## Project Commands
+
+```bash
+uv run pytest
+uv run ruff check .
+uv run ruff format --check .
+uv run pyright
 ```

codex/AGENTS.md

@@ -0,0 +1,129 @@
+# AGENTS.md
+
+## Current status
+
+Step 8 complete.
+
+## Completed steps
+
+Step 1 - Public API contract and pure core.
+Step 2 - Thread-safe state, commands, overlays, and cache model.
+Step 3 - Widget shell, sizing system, and GUI-thread frame pump.
+Step 4 - Tile manager, persistent cache, and asynchronous loading.
+Step 5 - Interaction: pan, zoom, and view commands.
+Step 6 - Overlay rendering and runtime update stress tests.
+Step 7 - Layers, provider switching, and clearing APIs.
+Step 8 - Documentation, hardening, and internal release.
+
+## Current step
+
+Internal rebuilt beta prepared.
+
+## Design decisions
+
+- Package is managed with uv.
+- Public import is `import dpg_map as dpgm`.
+- Dear PyGui calls are GUI-thread-only.
+- Runtime public calls enqueue commands or update logical state.
+- Overlay updates must not reset center/zoom.
+- The widget uses child_window + measured-size drawlist.
+- Tiles use a memory cache and persistent disk cache.
+- Tile providers are interchangeable.
+
+## Known issues
+
+None yet.
+
+## Commands used
+
+- Read `codex/STEPS.md`, `codex/FEATURES.md`, and `codex/ARCHITECTURE.md`.
+- Created initial package, examples, tests, and agent-log structure.
+- Implemented public exports, exceptions, common types, tile provider registry, projection helpers, cache dataclasses, and GUI-dependent API stubs.
+- Added Step 1 tests for imports, providers, projection, and cache dataclasses.
+- Implemented global configuration, logical MapState, map registry, and current map context stack.
+- Implemented DirtyFlags, MapCommand, CommandKind, and coalescing MapCommandQueue.
+- Implemented logical marker, polyline, trajectory, and layer state models.
+- Implemented public runtime overlay/view/layer/provider/cache/debug wrappers against logical state without Dear PyGui calls.
+- Implemented memory cache metadata, disk cache path generation, metadata read/write, disk size scanning, and prune planning.
+- Added Step 2 tests for command coalescing, overlay/view isolation, copied trajectory inputs, coordinate length validation, layer state, disk path generation, and prune ordering.
+- Implemented `map_widget(...)` as a Dear PyGui child-window plus drawlist shell.
+- Implemented GUI-thread renderer frame pump that schedules frame callbacks, drains command queues, measures size, resizes the drawlist, and draws a placeholder background/attribution.
+- Implemented sizing helpers for measured size, last non-zero size preservation, visibility transitions, effective draw size, and resize dirty flags.
+- Implemented map interaction hit-rectangle calculation.
+- Implemented TileID, TileStatus, Tile, visible tile calculation, and TileManager.
+- Implemented asynchronous tile worker queue for disk reads, HTTP fetches, and image decoding.
+- Implemented provider-namespaced persistent cache writes, access metadata updates, clearing, and LRU pruning.
+- Implemented memory tile cache with visible-tile protection and deferred GUI-thread texture deletion.
+- Integrated tile result processing, stale generation/provider rejection, texture creation, and tile drawing into the GUI-thread renderer.
+- Added OpenStreetMap User-Agent warning/fallback and configured examples with example user agents.
+- Added Step 3 examples for basic map, window sizing, child-window sizing, table sizing, and hidden-tab sizing.
+- Added Step 4 cache stress example.
+- Added Step 3 tests for sizing transitions, zero-size preservation, resize dirty flags, command drain ordering, and hit rectangles.
+- Added Step 4 tests for visible tile calculation, stale result rejection, protected memory eviction, and tile image decoding.
+- Ran a Dear PyGui context smoke check for `map_widget` child-window/drawlist creation.
+- Ran `uv run pytest`.
+- Ran `uv run ruff check .`.
+- Ran `uv run ruff format .`.
+- Ran `uv run ruff format --check .`.
+- Ran `uv run pyright`.
+- Ran `uv run pytest`.
+- Ran `uv run ruff check .`.
+- Ran `uv run ruff format .`.
+- Ran `uv run ruff format --check .`.
+- Ran `uv run pyright`.
+- Ran a Dear PyGui context smoke check for `map_widget` child-window/drawlist/texture-registry creation.
+- Implemented left mouse drag panning using the measured drawlist rectangle.
+- Implemented mouse wheel zoom around the cursor.
+- Implemented projection-backed `screen_to_latlon`, `latlon_to_screen`, and zoom-fitting `fit_bounds`.
+- Attached Dear PyGui mouse handlers through the map handler registry.
+- Added interaction debug state for active drag and last mouse position.
+- Added Step 5 tests for pan, cursor zoom, view conversion, bounds fitting, and overlay/view isolation.
+- Added Pyright virtualenv settings so `uv run pyright` resolves installed dependencies.
+- Ran `uv run pytest`.
+- Ran `uv run ruff check .`.
+- Ran `uv run ruff format --check .`.
+- Ran `uv run pyright`.
+- Ran a Dear PyGui context smoke check for `map_widget` child-window/drawlist/texture-registry/handler-registry creation.
+- Implemented Dear PyGui draw-layer bookkeeping for background, tiles, overlays, and attribution.
+- Rendered markers, polylines, and trajectories from GUI-thread overlay snapshots.
+- Isolated overlay redraws so they clear only the overlay draw layer and do not clear tile draw commands or textures.
+- Added live background-thread marker and trajectory stress examples.
+- Added Step 6 tests for overlay draw-layer isolation, overlay-only dirty flags, threaded update coalescing, and view/drag-state isolation.
+- Updated `README.md` with Step 6 overlay rendering behavior and examples.
+- Ran `uv run ruff format .`.
+- Ran `uv run pytest`.
+- Ran `uv run pyright`.
+- Ran `uv run ruff check .`.
+- Ran `uv run ruff format --check .`.
+- Ran a Dear PyGui context smoke check for `map_widget` with marker, polyline, and trajectory overlays.
+- Added `z_index` support for `add_layer`, layer visibility/clearing tests, and cache-safe map-wide memory clearing.
+- Implemented provider switching that validates providers, clamps zoom to the new provider range, preserves overlays/center, increments generation, and queues GUI-thread tile invalidation.
+- Implemented provider-scoped disk cache clearing and cache-size scanning.
+- Exported `CacheStats` publicly.
+- Added `examples/custom_provider.py` and cache control/stat buttons to `examples/cache_stress.py`.
+- Updated `README.md` with Step 7 behavior and examples.
+- Added Step 7 tests for provider switch tile invalidation, provider-scoped disk clearing, queued disk clear commands, layer z-order updates, and public exports.
+- Ran `uv run ruff format .`.
+- Ran `uv run pytest`.
+- Ran `uv run ruff check .`.
+- Ran `uv run ruff format --check .`.
+- Ran `uv run pyright`.
+- Ran `uv run python -c "import dpg_map as dpgm; print(dpgm.list_providers())"`.
+- Added docstrings for public API functions.
+- Rewrote `README.md` with uv install, local editable dependency, basic usage, sizing, live update, custom provider, cache, OpenStreetMap, and thread-safety documentation.
+- Added Step 8 hardening tests for unknown maps, overlays, providers, invalid coordinates, mismatched coordinate lengths, empty trajectory support, deleted overlays, provider switching while tiles are loading, overlay updates during dragging, and public docstrings.
+- Bumped package version to `0.3.0b1` and updated the fallback OpenStreetMap User-Agent version.
+- Ran `uv run pytest`.
+- Ran `uv run ruff format .`.
+- Ran `uv run ruff check .`.
+- Ran `uv run ruff format --check .`.
+- Ran `uv run pyright`.
+- Tested editable install from `/tmp/dpg-map-editable-test` with `uv add --editable /home/hector/projects/dpg-map`.
+- Ran editable install import check: `uv run python -c "import dpg_map as dpgm; print(dpgm.list_providers())"`.
+- Ran `uv run python -m py_compile` across all example files.
+- Started `examples/basic_map.py` under a 5-second timeout; it launched without terminal errors and was stopped by timeout because the GUI loop blocks.
+- Ran `uv sync`.
+
+## Next action
+
+Commit and tag `v0.3.0b1`.

codex/ARCHITECTURE.md

@@ -684,14 +684,14 @@ Create:
 src/dpg_map/
 examples/
 tests/
-FEATURES.md
-ARCHITECTURE.md
-STEPS.md
-AGENTS.md
+codex/FEATURES.md
+codex/ARCHITECTURE.md
+codex/STEPS.md
+codex/AGENTS.md
 README.md
 ```
 
-Use `AGENTS.md` as the rolling implementation log. After every step:
+Use `codex/AGENTS.md` as the rolling implementation log. After every step:
 
 ```bash
 uv run pytest

codex/README.md

@@ -0,0 +1,18 @@
+# Codex Build Notes
+
+This folder contains internal rebuild instructions, implementation architecture notes, and the
+rolling agent log used while preparing the beta.
+
+These files are not user-facing package documentation:
+
+- `AGENTS.md`: rolling implementation log and current build status
+- `ARCHITECTURE.md`: internal architecture and invariants
+- `FEATURES.md`: rebuild feature contract
+- `STEPS.md`: historical rebuild step plan
+
+User-facing documentation lives in:
+
+- `../README.md`
+- `../docs/GETTING_STARTED.md`
+- `../docs/EXAMPLES.md`
+- `../docs/API_REFERENCE.md`

codex/STEPS.md

@@ -7,11 +7,11 @@ There is no Step 0. Initial setup is listed separately, then implementation star
 ## Workflow rules
 
 1. Use `uv` for all Python package and dependency management.
-2. Always read `FEATURES.md`, `ARCHITECTURE.md`, and `AGENTS.md` before making code changes.
-3. Keep `AGENTS.md` as a rolling log of what has been done, what is broken, and what comes next.
+2. Always read `codex/FEATURES.md`, `codex/ARCHITECTURE.md`, and `codex/AGENTS.md` before making code changes.
+3. Keep `codex/AGENTS.md` as a rolling log of what has been done, what is broken, and what comes next.
 4. Update `README.md` whenever public behaviour or examples change.
 5. After every step:
-   - update `AGENTS.md`
+   - update `codex/AGENTS.md`
    - run relevant checks
    - commit to git
 6. Do not casually change public API once introduced.
@@ -55,10 +55,10 @@ src/dpg_map/
   exceptions.py
 examples/
 tests/
-FEATURES.md
-ARCHITECTURE.md
-STEPS.md
-AGENTS.md
+codex/FEATURES.md
+codex/ARCHITECTURE.md
+codex/STEPS.md
+codex/AGENTS.md
 README.md
 ```
 
@@ -76,7 +76,7 @@ select = ["E", "F", "I", "UP", "B", "SIM"]
 typeCheckingMode = "basic"
 ```
 
-Create `AGENTS.md` with:
+Create `codex/AGENTS.md` with:
 
 ```markdown
 # AGENTS.md
@@ -753,7 +753,7 @@ Acceptance criteria:
 - disk cache limit works
 - sizing examples work
 - README accurately documents thread-safety and cache behaviour
-- AGENTS.md accurately describes status
+- codex/AGENTS.md accurately describes status
 
 Commit:
 

docs/API_REFERENCE.md

@@ -0,0 +1,411 @@
+# API Reference
+
+Public imports are available from:
+
+```python
+import dpg_map as dpgm
+```
+
+Unless stated otherwise, runtime public functions are safe to call from non-GUI threads. They
+update logical state and enqueue GUI-thread renderer work. `map_widget(...)` is the main exception:
+it creates Dear PyGui items and must run on the GUI thread.
+
+## Common Types
+
+- `Tag`: `str | int`
+- `LatLon`: `tuple[float, float]` as `(lat, lon)`
+- `Point`: `tuple[float, float]` as `(x, y)`
+- `Bounds`: `tuple[LatLon, LatLon]` as `((south, west), (north, east))`
+- `Color`: RGB or RGBA integer tuple, usually `(r, g, b, a)`
+
+## Configuration
+
+### `configure(...) -> None`
+
+Configure package-wide defaults used by subsequently created maps.
+
+```python
+dpgm.configure(
+    user_agent=None,
+    cache_dir=None,
+    default_provider="osm",
+    memory_cache_max_tiles=512,
+    disk_cache_max_bytes=2_000_000_000,
+    prefetch_margin_tiles=1,
+    tile_worker_count=4,
+    overlay_update_policy="coalesce",
+    debug=False,
+)
+```
+
+Parameters:
+
+- `user_agent`: HTTP user agent for tile requests.
+- `cache_dir`: persistent tile cache root. Defaults to a platform user cache directory.
+- `default_provider`: provider name or `TileProvider` used by new maps.
+- `memory_cache_max_tiles`: maximum decoded runtime tile count per map.
+- `disk_cache_max_bytes`: maximum disk cache size. Use `None` for no size limit.
+- `prefetch_margin_tiles`: number of tiles to request around the visible viewport.
+- `tile_worker_count`: background worker count for disk/network/decode work.
+- `overlay_update_policy`: currently only `"coalesce"` is supported.
+- `debug`: store debug mode flag in global config.
+
+Raises `ValueError` for invalid cache, worker, prefetch, or update-policy settings.
+
+## Widget
+
+### `map_widget(...) -> Iterator[Tag | None]`
+
+Create a Dear PyGui child-window map shell and logical map context.
+
+```python
+with dpgm.map_widget(
+    tag="map",
+    center=(47.9029, 1.9093),
+    zoom=15,
+    provider="osm",
+    width=-1,
+    height=-1,
+):
+    dpgm.add_marker("vehicle", lat=47.9029, lon=1.9093)
+```
+
+Parameters:
+
+- `tag`: map tag. If omitted, a generated tag is used.
+- `center`: initial `(lat, lon)`.
+- `zoom`: initial zoom, clamped to provider range.
+- `provider`: provider name or `TileProvider`; defaults to configured default provider.
+- `width`, `height`: Dear PyGui child-window size arguments.
+- `autosize_x`, `autosize_y`: Dear PyGui child-window autosize flags.
+- `cache_dir`: optional per-map cache directory passed as keyword argument.
+- `user_agent`: optional per-map tile user agent passed as keyword argument.
+- Other keyword arguments are forwarded to `dpg.add_child_window(...)`.
+
+GUI-thread only.
+
+## View
+
+### `set_center(lat, lon, *, map_tag=None) -> None`
+
+Set the map center without changing zoom.
+
+### `get_center(*, map_tag=None) -> LatLon`
+
+Return the current logical map center.
+
+### `set_zoom(zoom, *, map_tag=None) -> None`
+
+Set the zoom, clamped to the current provider range.
+
+### `get_zoom(*, map_tag=None) -> int`
+
+Return the current logical zoom.
+
+### `set_view(*, center=None, zoom=None, map_tag=None) -> None`
+
+Set center and/or zoom as one logical view update.
+
+```python
+dpgm.set_view(center=(47.9029, 1.9093), zoom=15, map_tag="map")
+```
+
+### `fit_bounds(bounds, *, map_tag=None) -> None`
+
+Set center and zoom so bounds fit the current draw area.
+
+```python
+dpgm.fit_bounds(((47.89, 1.89), (47.92, 1.93)), map_tag="map")
+```
+
+### `screen_to_latlon(x, y, *, map_tag=None) -> LatLon`
+
+Convert map-local screen coordinates to latitude/longitude.
+
+### `latlon_to_screen(lat, lon, *, map_tag=None) -> Point`
+
+Convert latitude/longitude to map-local screen coordinates.
+
+## Markers
+
+### `add_marker(tag, *, lat, lon, label=None, layer="default", show=True, map_tag=None, **kwargs) -> Tag`
+
+Add or replace a marker overlay.
+
+Keyword options:
+
+- `color`: marker fill color, default `(255, 80, 80, 255)`.
+- `radius`: marker radius in pixels, default `5.0`.
+- `show_label`: draw `label` next to the marker, default `False`.
+- `user_data`: stored with the overlay model.
+- `callback`: stored with the overlay model for application use.
+
+### `update_marker(tag, *, lat=None, lon=None, label=None, map_tag=None, **kwargs) -> None`
+
+Update marker properties without changing map view.
+
+Supported keyword updates:
+
+- `show`
+- `color`
+- `radius`
+
+### `set_marker_position(tag, lat, lon, *, map_tag=None) -> None`
+
+Shortcut for `update_marker(..., lat=lat, lon=lon)`.
+
+### `set_marker_label(tag, label, *, map_tag=None) -> None`
+
+Shortcut for `update_marker(..., label=label)`.
+
+## Polylines
+
+### `add_polyline(tag, *, points=None, lats=None, lons=None, layer="default", show=True, map_tag=None, **kwargs) -> Tag`
+
+Add or replace a polyline overlay.
+
+Provide either:
+
+- `points=[(lat, lon), ...]`
+- or `lats=[...], lons=[...]`
+
+Keyword options:
+
+- `color`: line color, default `(80, 180, 255, 255)`.
+- `thickness`: line thickness, default `2.0`.
+- `closed`: close the polyline, default `False`.
+- `simplify`: stored with the overlay model, default `True`.
+- `user_data`: stored with the overlay model.
+
+### `update_polyline(tag, *, points=None, lats=None, lons=None, map_tag=None, **kwargs) -> None`
+
+Update polyline points or properties.
+
+Supported keyword updates:
+
+- `show`
+- `color`
+- `thickness`
+
+### `set_polyline_points(tag, points, *, map_tag=None) -> None`
+
+Shortcut for replacing a polyline point sequence.
+
+## Trajectories
+
+### `add_trajectory(tag, *, points=None, lats=None, lons=None, layer="default", show=True, map_tag=None, **kwargs) -> Tag`
+
+Add or replace a trajectory overlay.
+
+Provide either `points` or `lats`/`lons`. Empty trajectories are valid for live updates.
+
+Keyword options:
+
+- `timestamps`: optional sequence with the same length as points.
+- `color`: trajectory color, default `(255, 180, 60, 255)`.
+- `thickness`: line thickness, default `2.0`.
+- `show_points`: draw point markers along the trajectory, default `False`.
+- `point_stride`: draw every Nth point when `show_points=True`, default `1`.
+- `user_data`: stored with the overlay model.
+
+### `update_trajectory(tag, *, points=None, lats=None, lons=None, map_tag=None, **kwargs) -> None`
+
+Update trajectory points or properties.
+
+Supported keyword updates:
+
+- `timestamps`
+- `show`
+- `color`
+- `thickness`
+
+## Generic Overlay Control
+
+### `set_overlay_show(tag, show, *, map_tag=None) -> None`
+
+Show or hide an overlay without deleting it.
+
+### `delete_overlay(tag, *, map_tag=None) -> None`
+
+Delete an overlay from its map and layer.
+
+When `map_tag` is omitted, the API can resolve an overlay only if the tag is unambiguous across
+registered maps. In multi-map apps, pass `map_tag`.
+
+## Layers
+
+### `add_layer(name, *, z_index=None, show=True, map_tag=None) -> None`
+
+Create or update a logical overlay layer.
+
+### `show_layer(name, *, map_tag=None) -> None`
+
+Show all overlays assigned to a layer.
+
+### `hide_layer(name, *, map_tag=None) -> None`
+
+Hide all overlays assigned to a layer.
+
+### `clear_layer(name, *, map_tag=None) -> None`
+
+Delete all overlays assigned to a layer.
+
+### `clear_map(*, map_tag=None) -> None`
+
+Delete all overlays and invalidate map tile resources.
+
+## Tile Providers
+
+### `TileProvider`
+
+Immutable tile provider definition.
+
+```python
+dpgm.TileProvider(
+    name="custom",
+    url_template="https://example.com/{z}/{x}/{y}.png",
+    min_zoom=0,
+    max_zoom=19,
+    tile_size=256,
+    attribution="Tiles (c) Example",
+    headers={},
+    subdomains=(),
+    retina=False,
+    file_extension=None,
+)
+```
+
+Fields:
+
+- `name`: provider registry name.
+- `url_template`: XYZ URL template with `{z}`, `{x}`, and `{y}`.
+- `min_zoom`, `max_zoom`: valid zoom range.
+- `tile_size`: tile size in pixels.
+- `attribution`: text drawn on the map.
+- `headers`: request headers.
+- `subdomains`: values for `{s}`.
+- `retina`: if true, `{r}` expands to `"@2x"`.
+- `file_extension`: value for `{ext}` and disk cache extension.
+
+### `register_provider(provider, *, replace=False) -> None`
+
+Register a provider by name.
+
+### `unregister_provider(name) -> None`
+
+Remove a registered provider.
+
+### `get_provider(name) -> TileProvider`
+
+Return a registered provider.
+
+### `list_providers() -> list[str]`
+
+Return registered provider names in sorted order.
+
+### `set_provider(provider, *, map_tag=None) -> None`
+
+Switch a map to another provider while preserving overlays and center.
+
+`provider` may be a provider name or a `TileProvider`. Provider switching clamps zoom to the new
+provider range and invalidates stale tile loads.
+
+## Cache
+
+### `CacheStats`
+
+Public cache statistics snapshot.
+
+Fields:
+
+- `memory_tiles`
+- `memory_max_tiles`
+- `memory_hits`
+- `memory_misses`
+- `disk_bytes`
+- `disk_max_bytes`
+- `disk_hits`
+- `disk_misses`
+- `disk_path`
+
+### `get_cache_stats(*, map_tag=None) -> CacheStats`
+
+Return memory and disk cache diagnostics. With `map_tag=None`, returns global disk-cache stats and
+configured memory limit.
+
+### `clear_memory_cache(*, map_tag=None) -> None`
+
+Clear decoded in-memory tile data. If `map_tag` is omitted outside a map context, all registered
+maps are targeted.
+
+### `clear_disk_cache(provider=None, *, map_tag=None) -> None`
+
+Clear persistent tile cache data.
+
+- `provider=None`: clear all provider namespaces.
+- `provider="osm"`: clear only one provider namespace.
+- `map_tag="map"`: enqueue a map-scoped clear through the renderer.
+
+## Diagnostics
+
+### `get_map_debug_state(*, map_tag=None) -> dict[str, Any]`
+
+Return a diagnostic snapshot for a map. Keys include:
+
+- `tag`
+- `center`
+- `zoom`
+- `requested_size`
+- `measured_size`
+- `visible`
+- `provider`
+- `overlay_count`
+- `layers`
+- `dirty_flags`
+- `pending_command_count`
+- `generation`
+- `active_drag`
+- `last_mouse_position`
+- `tiles`
+
+This output is for debugging and logging. It is not guaranteed to be a stable serialization
+format.
+
+## Exceptions
+
+Public exception classes are defined in `dpg_map.exceptions`:
+
+- `DpgMapError`
+- `ProviderError`
+- `ProviderExistsError`
+- `ProviderNotFoundError`
+- `InvalidProviderError`
+- `ProjectionError`
+- `MapNotFoundError`
+- `OverlayNotFoundError`
+- `CoordinateError`
+- `ThreadingError`
+- `CacheError`
+
+Common error cases:
+
+- Invalid latitude/longitude raises `CoordinateError`.
+- Unknown map tags raise `MapNotFoundError`.
+- Unknown overlay tags raise `OverlayNotFoundError`.
+- Unknown or invalid providers raise provider-specific errors.
+
+## Threading Contract
+
+GUI-thread only:
+
+- `map_widget(...)`
+- Dear PyGui setup and application code that creates widgets
+
+Runtime-safe public areas:
+
+- View updates: `set_center`, `set_zoom`, `set_view`, `fit_bounds`
+- Overlay updates: `add_marker`, `update_marker`, `update_trajectory`, `delete_overlay`
+- Layer updates: `add_layer`, `show_layer`, `hide_layer`, `clear_layer`
+- Provider and cache updates: `set_provider`, `clear_memory_cache`, `clear_disk_cache`
+
+The renderer owns Dear PyGui draw commands, textures, input handlers, and frame callbacks.

docs/EXAMPLES.md

@@ -0,0 +1,146 @@
+# Examples
+
+The `examples/` directory contains runnable Dear PyGui programs:
+
+```bash
+uv run python examples/basic_map.py
+uv run python examples/custom_provider.py
+uv run python examples/cache_stress.py
+uv run python examples/markers_live_thread.py
+uv run python examples/trajectory_live_thread.py
+uv run python examples/sizing_window.py
+uv run python examples/sizing_child.py
+uv run python examples/sizing_table.py
+uv run python examples/hidden_tab.py
+```
+
+## Basic Map
+
+Creates one map and one marker.
+
+```python
+with dpg.window(label="Map", width=-1, height=-1):
+    with dpgm.map_widget(tag="map", center=(47.9029, 1.9093), zoom=15, width=-1, height=-1):
+        dpgm.add_marker("vehicle", lat=47.9029, lon=1.9093)
+```
+
+Run:
+
+```bash
+uv run python examples/basic_map.py
+```
+
+## Live Marker Updates
+
+Use explicit `map_tag` from background threads or callbacks.
+
+```python
+dpgm.add_marker("vehicle", lat=47.9029, lon=1.9093, map_tag="map")
+
+def update_from_telemetry(lat: float, lon: float) -> None:
+    dpgm.update_marker("vehicle", lat=lat, lon=lon, map_tag="map")
+```
+
+Run a threaded stress example:
+
+```bash
+uv run python examples/markers_live_thread.py
+```
+
+## Live Trajectory
+
+Keep an application-owned point buffer and pass immutable snapshots to `update_trajectory(...)`.
+
+```python
+points: list[tuple[float, float]] = []
+dpgm.add_trajectory("track", points=[], show_points=True, point_stride=12, map_tag="map")
+
+def push_point(lat: float, lon: float) -> None:
+    points.append((lat, lon))
+    dpgm.update_trajectory("track", points=tuple(points), map_tag="map")
+```
+
+Run:
+
+```bash
+uv run python examples/trajectory_live_thread.py
+```
+
+## Multiple Maps
+
+Each map is independent. Reusing overlay tags across different maps is valid, but runtime updates
+should pass `map_tag` to avoid ambiguity.
+
+```python
+with dpgm.map_widget(tag="live-map", center=(47.9, 1.9), zoom=15, width=-1, height=300):
+    dpgm.add_marker("vehicle", lat=47.9, lon=1.9)
+
+with dpgm.map_widget(tag="recap-map", center=(47.9, 1.9), zoom=13, width=-1, height=300):
+    dpgm.add_trajectory("vehicle", points=[])
+
+dpgm.update_marker("vehicle", lat=47.901, lon=1.902, map_tag="live-map")
+dpgm.update_trajectory("vehicle", points=lap_points, map_tag="recap-map")
+```
+
+## Custom Provider Switch
+
+Register a provider, create the map with it, and switch at runtime.
+
+```python
+carto = dpgm.TileProvider(
+    name="carto-light",
+    url_template="https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png",
+    subdomains=("a", "b", "c", "d"),
+    attribution="(c) OpenStreetMap contributors (c) CARTO",
+)
+
+dpgm.register_provider(carto)
+dpgm.set_provider("carto-light", map_tag="map")
+dpgm.set_provider("osm", map_tag="map")
+```
+
+Run:
+
+```bash
+uv run python examples/custom_provider.py
+```
+
+## Cache Controls
+
+Configure a local cache and expose buttons in your UI.
+
+```python
+dpgm.configure(cache_dir=".tile-cache", memory_cache_max_tiles=128)
+
+def clear_memory() -> None:
+    dpgm.clear_memory_cache(map_tag="map")
+
+def clear_disk() -> None:
+    dpgm.clear_disk_cache(map_tag="map")
+
+def refresh_stats() -> str:
+    stats = dpgm.get_cache_stats(map_tag="map")
+    return f"{stats.memory_tiles} memory tiles, {stats.disk_bytes} disk bytes"
+```
+
+Run:
+
+```bash
+uv run python examples/cache_stress.py
+```
+
+## Layout And Sizing
+
+The widget works inside windows, child windows, tables, and hidden tabs.
+
+```python
+with dpg.child_window(width=-1, height=420):
+    with dpgm.map_widget(tag="map-child", width=-1, height=-1):
+        dpgm.add_marker("inside-child", lat=47.0, lon=2.0)
+```
+
+Run:
+
+```bash
+uv run python examples/sizing_child.py
+```

docs/GETTING_STARTED.md

@@ -0,0 +1,286 @@
+# Getting Started
+
+This guide walks through installing `dpg-map`, creating a map widget, adding overlays, updating
+the map from runtime code, and configuring tile providers and caches.
+
+## Requirements
+
+`dpg-map` currently targets Python `>=3.14` and uses:
+
+- Dear PyGui for the UI
+- Pillow for decoding tile images
+- Requests for tile HTTP requests
+- Platformdirs for the default disk cache location
+
+The project is managed with `uv`.
+
+## Install From This Repository
+
+For development inside this repository:
+
+```bash
+uv sync
+uv run python -c "import dpg_map as dpgm; print(dpgm.list_providers())"
+```
+
+For another local app using this checkout:
+
+```bash
+cd /path/to/your-app
+uv add --editable /home/hector/projects/dpg-map
+```
+
+Then import it as:
+
+```python
+import dpg_map as dpgm
+```
+
+## Configure The Package
+
+Configure package-wide defaults before creating maps:
+
+```python
+dpgm.configure(
+    user_agent="my-product/1.0 contact@example.com",
+    cache_dir=".tile-cache",
+    memory_cache_max_tiles=512,
+    disk_cache_max_bytes=2_000_000_000,
+)
+```
+
+Set an application-specific `user_agent` when using OpenStreetMap tiles. If no user agent is
+configured, `dpg-map` emits a runtime warning and uses a fallback package user agent.
+
+## Create A Map
+
+`map_widget(...)` is a Dear PyGui context manager. It creates a child window containing the map
+drawlist and installs internal render and input handlers.
+
+```python
+from typing import Any
+
+import dearpygui.dearpygui as _dpg
+import dpg_map as dpgm
+
+dpg: Any = _dpg
+
+dpgm.configure(user_agent="getting-started/0.1 contact@example.com")
+
+dpg.create_context()
+dpg.create_viewport(title="dpg-map", width=900, height=600)
+
+with dpg.window(label="Map", width=-1, height=-1):
+    with dpgm.map_widget(tag="map", center=(47.9029, 1.9093), zoom=15, width=-1, height=-1):
+        dpgm.add_marker("start", lat=47.9029, lon=1.9093, label="Start")
+
+dpg.setup_dearpygui()
+dpg.show_viewport()
+dpg.start_dearpygui()
+dpg.destroy_context()
+```
+
+`map_widget(...)` must be called on the GUI thread inside an active Dear PyGui context.
+
+## Tags And Map Scope
+
+Each map has a `tag`. Runtime calls should pass `map_tag` when there may be more than one map:
+
+```python
+dpgm.set_center(47.9029, 1.9093, map_tag="live-map")
+dpgm.update_marker("vehicle", lat=47.9030, lon=1.9098, map_tag="live-map")
+```
+
+Inside a `with dpgm.map_widget(...)` block, overlay creation can omit `map_tag` because the map is
+the current map context:
+
+```python
+with dpgm.map_widget(tag="live-map"):
+    dpgm.add_marker("vehicle", lat=47.9029, lon=1.9093)
+```
+
+Use explicit `map_tag` in callbacks, worker threads, and apps with multiple maps.
+
+## Add Overlays
+
+Markers:
+
+```python
+dpgm.add_marker(
+    "vehicle",
+    lat=47.9029,
+    lon=1.9093,
+    label="Vehicle",
+    show_label=True,
+    color=(255, 80, 80, 255),
+    radius=6,
+    map_tag="map",
+)
+```
+
+Polylines:
+
+```python
+dpgm.add_polyline(
+    "route",
+    points=[(47.9029, 1.9093), (47.9050, 1.9150), (47.9080, 1.9180)],
+    color=(80, 180, 255, 255),
+    thickness=3,
+    map_tag="map",
+)
+```
+
+Trajectories:
+
+```python
+dpgm.add_trajectory(
+    "track",
+    points=[],
+    color=(255, 180, 60, 255),
+    thickness=3,
+    show_points=True,
+    point_stride=10,
+    map_tag="map",
+)
+```
+
+Coordinates are `(lat, lon)` pairs in degrees. Latitude must be between `-90` and `90`;
+longitude must be between `-180` and `180`.
+
+## Runtime Updates
+
+Runtime public calls are intended to be safe from background threads. They update logical state
+and enqueue GUI-thread work instead of calling Dear PyGui directly.
+
+```python
+dpgm.update_marker("vehicle", lat=current_lat, lon=current_lon, map_tag="map")
+dpgm.update_trajectory("track", points=tuple(track_points), map_tag="map")
+```
+
+Overlay updates do not reset map center or zoom.
+
+## View Control
+
+```python
+dpgm.set_center(47.9029, 1.9093, map_tag="map")
+dpgm.set_zoom(15, map_tag="map")
+dpgm.set_view(center=(47.9029, 1.9093), zoom=15, map_tag="map")
+dpgm.fit_bounds(((47.89, 1.89), (47.92, 1.93)), map_tag="map")
+```
+
+`set_zoom(...)` and `set_view(...)` clamp zoom to the active provider range.
+
+Coordinate conversion helpers use map-local screen coordinates:
+
+```python
+lat, lon = dpgm.screen_to_latlon(120, 80, map_tag="map")
+x, y = dpgm.latlon_to_screen(47.9029, 1.9093, map_tag="map")
+```
+
+## Layers
+
+Overlays belong to named layers. Layers can be shown, hidden, cleared, and ordered with
+`z_index`.
+
+```python
+dpgm.add_layer("vehicles", z_index=80, map_tag="map")
+dpgm.add_marker("car-1", lat=47.9, lon=1.9, layer="vehicles", map_tag="map")
+
+dpgm.hide_layer("vehicles", map_tag="map")
+dpgm.show_layer("vehicles", map_tag="map")
+dpgm.clear_layer("vehicles", map_tag="map")
+```
+
+Default layers include `default`, `markers`, `lines`, and `trajectories`.
+
+## Tile Providers
+
+OpenStreetMap is registered by default as `osm`.
+
+Custom providers use XYZ URL templates. Required template fields are `{z}`, `{x}`, and `{y}`.
+Optional fields are `{s}` for subdomain, `{r}` for retina suffix, and `{ext}` for file extension.
+
+```python
+provider = dpgm.TileProvider(
+    name="carto-light",
+    url_template="https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png",
+    subdomains=("a", "b", "c", "d"),
+    attribution="(c) OpenStreetMap contributors (c) CARTO",
+    file_extension="png",
+)
+
+dpgm.register_provider(provider)
+dpgm.set_provider("carto-light", map_tag="map")
+```
+
+Provider switching preserves overlays and center, clamps zoom to the new provider range, and
+invalidates stale tile loads from the previous provider.
+
+## Cache
+
+`dpg-map` uses:
+
+- A memory cache for decoded runtime tiles
+- A persistent provider-namespaced disk cache
+
+```python
+stats = dpgm.get_cache_stats(map_tag="map")
+print(stats.memory_tiles, stats.disk_bytes, stats.disk_path)
+
+dpgm.clear_memory_cache(map_tag="map")
+dpgm.clear_disk_cache(provider="osm")
+```
+
+`clear_memory_cache(...)` is routed through the renderer command queue so Dear PyGui textures are
+deleted on the GUI thread. `clear_disk_cache(...)` can clear all providers, one provider, or a
+map-scoped cache directory.
+
+## Sizing
+
+The map widget is a Dear PyGui child window containing a measured drawlist.
+
+Common sizing modes:
+
+- `width=-1`, `height=-1`: fill available space where Dear PyGui supports it
+- Positive `width` and `height`: fixed requested size
+- `autosize_x=True` or `autosize_y=True`: pass Dear PyGui autosize flags to the child
+- Hidden layouts preserve the last non-zero measured size until visible again
+
+Examples:
+
+```bash
+uv run python examples/sizing_window.py
+uv run python examples/sizing_child.py
+uv run python examples/sizing_table.py
+uv run python examples/hidden_tab.py
+```
+
+## Multiple Maps
+
+Multiple maps can be used in the same Dear PyGui app. Give each map a distinct tag and pass
+`map_tag` for runtime updates.
+
+```python
+with dpgm.map_widget(tag="live-map", center=(47.9, 1.9), zoom=15, width=-1, height=300):
+    dpgm.add_marker("vehicle", lat=47.9, lon=1.9)
+
+with dpgm.map_widget(tag="recap-map", center=(47.9, 1.9), zoom=13, width=-1, height=300):
+    dpgm.add_trajectory("lap", points=[])
+
+dpgm.update_marker("vehicle", lat=47.901, lon=1.902, map_tag="live-map")
+dpgm.update_trajectory("lap", points=lap_points, map_tag="recap-map")
+```
+
+Pan, zoom, tile rendering, overlays, providers, and caches are isolated per map unless you choose
+to share global configuration.
+
+## Diagnostics
+
+Use `get_map_debug_state(...)` and `get_cache_stats(...)` while developing or troubleshooting:
+
+```python
+debug = dpgm.get_map_debug_state(map_tag="map")
+stats = dpgm.get_cache_stats(map_tag="map")
+```
+
+These snapshots are intended for diagnostics and logging, not as a stable serialization format.

examples/cache_stress.py

@@ -21,15 +21,37 @@ def main() -> None:
     dpg.create_context()
     dpg.create_viewport(title="dpg-map cache stress", width=1000, height=700)
 
+    def clear_memory() -> None:
+        dpgm.clear_memory_cache(map_tag="cache-map")
+
+    def clear_disk() -> None:
+        dpgm.clear_disk_cache(map_tag="cache-map")
+
+    def refresh_stats() -> None:
+        stats = dpgm.get_cache_stats(map_tag="cache-map")
+        dpg.set_value(
+            "cache-stats",
+            (
+                f"memory {stats.memory_tiles}/{stats.memory_max_tiles} tiles | "
+                f"disk {stats.disk_bytes // 1024} KiB | "
+                f"hits m:{stats.memory_hits} d:{stats.disk_hits}"
+            ),
+        )
+
     with (
         dpg.window(label="Cache Stress", width=-1, height=-1),
-        dpgm.map_widget(
+    ):
+        with dpg.group(horizontal=True):
+            dpg.add_button(label="Clear Memory", callback=clear_memory)
+            dpg.add_button(label="Clear Disk", callback=clear_disk)
+            dpg.add_button(label="Stats", callback=refresh_stats)
+            dpg.add_text("", tag="cache-stats")
+        with dpgm.map_widget(
             tag="cache-map",
             center=(47.9029, 1.9093),
             zoom=14,
             width=-1,
             height=-1,
-        ),
         ):
             dpgm.add_marker("start", lat=47.9029, lon=1.9093, label="Orleans")
 

examples/custom_provider.py

@@ -0,0 +1,52 @@
+from typing import Any
+
+import dearpygui.dearpygui as _dpg
+
+import dpg_map as dpgm
+
+dpg: Any = _dpg
+
+
+def main() -> None:
+    dpgm.configure(user_agent="dpg-map custom_provider example")
+    provider = dpgm.TileProvider(
+        name="carto-light",
+        url_template="https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png",
+        subdomains=("a", "b", "c", "d"),
+        attribution="(c) OpenStreetMap contributors (c) CARTO",
+        file_extension="png",
+    )
+    if "carto-light" not in dpgm.list_providers():
+        dpgm.register_provider(provider)
+
+    dpg.create_context()
+    dpg.create_viewport(title="dpg-map custom provider", width=900, height=600)
+
+    def use_osm() -> None:
+        dpgm.set_provider("osm", map_tag="custom-provider-map")
+
+    def use_carto() -> None:
+        dpgm.set_provider("carto-light", map_tag="custom-provider-map")
+
+    with dpg.window(label="Custom Provider", width=-1, height=-1):
+        with dpg.group(horizontal=True):
+            dpg.add_button(label="OSM", callback=use_osm)
+            dpg.add_button(label="Carto", callback=use_carto)
+        with dpgm.map_widget(
+            tag="custom-provider-map",
+            provider="carto-light",
+            center=(47.9029, 1.9093),
+            zoom=13,
+            width=-1,
+            height=-1,
+        ):
+            dpgm.add_marker("orleans", lat=47.9029, lon=1.9093, label="Orleans")
+
+    dpg.setup_dearpygui()
+    dpg.show_viewport()
+    dpg.start_dearpygui()
+    dpg.destroy_context()
+
+
+if __name__ == "__main__":
+    main()

examples/markers_live_thread.py

@@ -0,0 +1,66 @@
+from __future__ import annotations
+
+from math import cos, sin
+from threading import Event, Thread
+from time import sleep
+from typing import Any
+
+import dearpygui.dearpygui as _dpg
+
+import dpg_map as dpgm
+
+dpg: Any = _dpg
+
+
+def main() -> None:
+    dpgm.configure(user_agent="dpg-map markers_live_thread example")
+    stop = Event()
+
+    dpg.create_context()
+    dpg.create_viewport(title="dpg-map live markers", width=1000, height=700)
+
+    with (
+        dpg.window(label="Live Markers", width=-1, height=-1),
+        dpgm.map_widget(
+            tag="live-markers-map", center=(47.9029, 1.9093), zoom=15, width=-1, height=-1
+        ),
+    ):
+        for index in range(12):
+            dpgm.add_marker(
+                f"vehicle-{index}",
+                lat=47.9029,
+                lon=1.9093,
+                label=str(index + 1),
+                show_label=True,
+                color=(240, 92, 70, 255),
+            )
+
+    def update_markers() -> None:
+        tick = 0
+        while not stop.is_set():
+            for index in range(12):
+                angle = tick * 0.08 + index * 0.52
+                radius = 0.0015 + (index % 4) * 0.0002
+                dpgm.update_marker(
+                    f"vehicle-{index}",
+                    lat=47.9029 + sin(angle) * radius,
+                    lon=1.9093 + cos(angle) * radius,
+                    map_tag="live-markers-map",
+                )
+            tick += 1
+            sleep(1 / 30)
+
+    worker = Thread(target=update_markers, name="dpg-map-live-markers", daemon=True)
+    worker.start()
+    try:
+        dpg.setup_dearpygui()
+        dpg.show_viewport()
+        dpg.start_dearpygui()
+    finally:
+        stop.set()
+        worker.join(timeout=1.0)
+        dpg.destroy_context()
+
+
+if __name__ == "__main__":
+    main()

examples/trajectory_live_thread.py

@@ -0,0 +1,76 @@
+from __future__ import annotations
+
+from collections import deque
+from math import cos, sin
+from threading import Event, Thread
+from time import sleep
+from typing import Any
+
+import dearpygui.dearpygui as _dpg
+
+import dpg_map as dpgm
+
+dpg: Any = _dpg
+
+
+def main() -> None:
+    dpgm.configure(user_agent="dpg-map trajectory_live_thread example")
+    stop = Event()
+    points: deque[tuple[float, float]] = deque(maxlen=240)
+
+    dpg.create_context()
+    dpg.create_viewport(title="dpg-map live trajectory", width=1000, height=700)
+
+    with (
+        dpg.window(label="Live Trajectory", width=-1, height=-1),
+        dpgm.map_widget(
+            tag="live-trajectory-map",
+            center=(47.9029, 1.9093),
+            zoom=15,
+            width=-1,
+            height=-1,
+        ),
+    ):
+        dpgm.add_trajectory(
+            "track",
+            points=[],
+            color=(250, 190, 80, 255),
+            thickness=3.0,
+            show_points=True,
+            point_stride=12,
+        )
+        dpgm.add_marker(
+            "head",
+            lat=47.9029,
+            lon=1.9093,
+            color=(72, 205, 154, 255),
+            radius=6,
+        )
+
+    def update_trajectory() -> None:
+        tick = 0
+        while not stop.is_set():
+            angle = tick * 0.06
+            lat = 47.9029 + sin(angle) * 0.0016 + sin(angle * 2.7) * 0.00025
+            lon = 1.9093 + cos(angle) * 0.0016
+            points.append((lat, lon))
+            snapshot = tuple(points)
+            dpgm.update_trajectory("track", points=snapshot, map_tag="live-trajectory-map")
+            dpgm.update_marker("head", lat=lat, lon=lon, map_tag="live-trajectory-map")
+            tick += 1
+            sleep(1 / 20)
+
+    worker = Thread(target=update_trajectory, name="dpg-map-live-trajectory", daemon=True)
+    worker.start()
+    try:
+        dpg.setup_dearpygui()
+        dpg.show_viewport()
+        dpg.start_dearpygui()
+    finally:
+        stop.set()
+        worker.join(timeout=1.0)
+        dpg.destroy_context()
+
+
+if __name__ == "__main__":
+    main()

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "dpg-map"
-version = "0.1.0"
-description = "Add your description here"
+version = "1.0.0"
+description = "Dear PyGui map widget for XYZ raster tiles and geographic overlays"
 readme = "README.md"
 authors = [
     { name = "Hector van der Aa", email = "hector@h3cx.dev" }
@@ -37,3 +37,5 @@ select = ["E", "F", "I", "UP", "B", "SIM"]
 
 [tool.pyright]
 typeCheckingMode = "basic"
+venvPath = "."
+venv = ".venv"

src/dpg_map/__init__.py

@@ -32,6 +32,7 @@ from .api import (
     update_polyline,
     update_trajectory,
 )
+from .cache import CacheStats
 from .providers import (
     TileProvider,
     get_provider,
@@ -42,6 +43,7 @@ from .providers import (
 from .widget import map_widget
 
 __all__ = [
+    "CacheStats",
     "TileProvider",
     "add_layer",
     "add_marker",

src/dpg_map/api.py

@@ -10,15 +10,24 @@ from typing import Any
 
 from .cache import CacheStats, clear_disk_cache_path, disk_cache_root, disk_cache_size_bytes
 from .commands import CommandKind, MapCommand
-from .exceptions import CoordinateError, OverlayNotFoundError
+from .exceptions import (
+    CoordinateError,
+    InvalidProviderError,
+    MapNotFoundError,
+    OverlayNotFoundError,
+)
+from .interaction import latlon_to_screen_in_state, screen_to_latlon_in_state
 from .overlays import LayerState, MarkerOverlay, Overlay, PolylineOverlay, TrajectoryOverlay
+from .projection import latlon_to_world
 from .providers import TileProvider, get_provider
+from .sizing import effective_draw_size
 from .state import (
     DirtyFlags,
     configure_state,
     find_map_for_overlay,
     get_config,
     get_map_state,
+    list_map_states,
     mark_dirty,
 )
 from .types import Bounds, LatLon, Point, Tag
@@ -87,6 +96,8 @@ def configure(
     overlay_update_policy: str = "coalesce",
     debug: bool = False,
 ) -> None:
+    """Configure package-wide defaults used by subsequently created maps."""
+
     configure_state(
         user_agent=user_agent,
         cache_dir=cache_dir,
@@ -101,20 +112,28 @@ def configure(
 
 
 def set_center(lat: float, lon: float, *, map_tag: Tag | None = None) -> None:
+    """Set a map center without changing its zoom."""
+
     set_view(center=_validate_latlon(lat, lon), map_tag=map_tag)
 
 
 def get_center(*, map_tag: Tag | None = None) -> LatLon:
+    """Return the current logical center of a map."""
+
     state = get_map_state(map_tag)
     with state.lock:
         return state.center
 
 
 def set_zoom(zoom: int, *, map_tag: Tag | None = None) -> None:
+    """Set a map zoom, clamped to the map/provider zoom range."""
+
     set_view(zoom=zoom, map_tag=map_tag)
 
 
 def get_zoom(*, map_tag: Tag | None = None) -> int:
+    """Return the current logical zoom of a map."""
+
     state = get_map_state(map_tag)
     with state.lock:
         return state.zoom
@@ -126,6 +145,8 @@ def set_view(
     zoom: int | None = None,
     map_tag: Tag | None = None,
 ) -> None:
+    """Set map center and/or zoom as one logical view update."""
+
     state = get_map_state(map_tag)
     with state.lock:
         payload: dict[str, Any] = {}
@@ -142,22 +163,46 @@ def set_view(
 
 
 def fit_bounds(bounds: Bounds, *, map_tag: Tag | None = None) -> None:
+    """Set center and zoom so geographic bounds fit the current draw area."""
+
     (south_west, north_east) = bounds
     south, west = _validate_latlon(south_west[0], south_west[1])
     north, east = _validate_latlon(north_east[0], north_east[1])
-    set_center((south + north) / 2.0, (west + east) / 2.0, map_tag=map_tag)
+    south, north = min(south, north), max(south, north)
+    state = get_map_state(map_tag)
+    with state.lock:
+        width, height = effective_draw_size(state)
+        padding = 32
+        usable_width = max(1, width - padding * 2)
+        usable_height = max(1, height - padding * 2)
+        tile_size = state.provider.tile_size
+        target_zoom = state.min_zoom
+        for candidate_zoom in range(state.max_zoom, state.min_zoom - 1, -1):
+            west_x, north_y = latlon_to_world(north, west, candidate_zoom, tile_size)
+            east_x, south_y = latlon_to_world(south, east, candidate_zoom, tile_size)
+            world_size = tile_size * (2**candidate_zoom)
+            x_span = abs(east_x - west_x)
+            x_span = min(x_span, world_size - x_span)
+            y_span = abs(south_y - north_y)
+            if x_span <= usable_width and y_span <= usable_height:
+                target_zoom = candidate_zoom
+                break
+    set_view(center=((south + north) / 2.0, (west + east) / 2.0), zoom=target_zoom, map_tag=map_tag)
 
 
 def screen_to_latlon(x: float, y: float, *, map_tag: Tag | None = None) -> LatLon:
-    _ = (x, y)
-    return get_center(map_tag=map_tag)
+    """Convert map-local screen coordinates to latitude/longitude."""
+
+    state = get_map_state(map_tag)
+    return screen_to_latlon_in_state(state, float(x), float(y))
 
 
 def latlon_to_screen(lat: float, lon: float, *, map_tag: Tag | None = None) -> Point:
-    _validate_latlon(lat, lon)
+    """Convert latitude/longitude to map-local screen coordinates."""
+
+    lat_value, lon_value = _validate_latlon(lat, lon)
     state = get_map_state(map_tag)
-    with state.lock:
-        return (state.measured_width / 2.0, state.measured_height / 2.0)
+    return latlon_to_screen_in_state(state, lat_value, lon_value)
 
 
 def add_marker(
@@ -171,6 +216,8 @@ def add_marker(
     map_tag: Tag | None = None,
     **kwargs: Any,
 ) -> Tag:
+    """Add or replace a marker overlay and return its tag."""
+
     state = get_map_state(map_tag)
     color = kwargs.get("color", (255, 80, 80, 255))
     radius = float(kwargs.get("radius", 5.0))
@@ -210,6 +257,8 @@ def add_polyline(
     map_tag: Tag | None = None,
     **kwargs: Any,
 ) -> Tag:
+    """Add or replace a polyline overlay and return its tag."""
+
     state = get_map_state(map_tag)
     copied_points = _points_from_inputs(points, lats=lats, lons=lons)
     with state.lock:
@@ -243,6 +292,8 @@ def add_trajectory(
     map_tag: Tag | None = None,
     **kwargs: Any,
 ) -> Tag:
+    """Add or replace a trajectory overlay and return its tag."""
+
     state = get_map_state(map_tag)
     copied_points = _points_from_inputs(points, lats=lats, lons=lons)
     timestamps = kwargs.get("timestamps")
@@ -282,6 +333,8 @@ def update_marker(
     map_tag: Tag | None = None,
     **kwargs: Any,
 ) -> None:
+    """Update marker properties without changing the map view."""
+
     state = find_map_for_overlay(tag, map_tag)
     with state.lock:
         overlay = state.overlays.get(tag)
@@ -314,6 +367,8 @@ def update_polyline(
     map_tag: Tag | None = None,
     **kwargs: Any,
 ) -> None:
+    """Update polyline properties without changing the map view."""
+
     state = find_map_for_overlay(tag, map_tag)
     with state.lock:
         overlay = state.overlays.get(tag)
@@ -341,6 +396,8 @@ def update_trajectory(
     map_tag: Tag | None = None,
     **kwargs: Any,
 ) -> None:
+    """Update trajectory properties without changing the map view."""
+
     state = find_map_for_overlay(tag, map_tag)
     with state.lock:
         overlay = state.overlays.get(tag)
@@ -365,10 +422,14 @@ def update_trajectory(
 
 
 def set_marker_position(tag: Tag, lat: float, lon: float, *, map_tag: Tag | None = None) -> None:
+    """Set a marker latitude/longitude."""
+
     update_marker(tag, lat=lat, lon=lon, map_tag=map_tag)
 
 
 def set_marker_label(tag: Tag, label: str, *, map_tag: Tag | None = None) -> None:
+    """Set a marker label."""
+
     update_marker(tag, label=label, map_tag=map_tag)
 
 
@@ -378,10 +439,14 @@ def set_polyline_points(
     *,
     map_tag: Tag | None = None,
 ) -> None:
+    """Replace a polyline point sequence."""
+
     update_polyline(tag, points=points, map_tag=map_tag)
 
 
 def set_overlay_show(tag: Tag, show: bool, *, map_tag: Tag | None = None) -> None:
+    """Show or hide an overlay without deleting it."""
+
     state = find_map_for_overlay(tag, map_tag)
     with state.lock:
         overlay = state.overlays.get(tag)
@@ -394,6 +459,8 @@ def set_overlay_show(tag: Tag, show: bool, *, map_tag: Tag | None = None) -> Non
 
 
 def delete_overlay(tag: Tag, *, map_tag: Tag | None = None) -> None:
+    """Delete an overlay from its map and layer."""
+
     state = find_map_for_overlay(tag, map_tag)
     with state.lock:
         overlay = state.overlays.pop(tag, None)
@@ -406,16 +473,46 @@ def delete_overlay(tag: Tag, *, map_tag: Tag | None = None) -> None:
         _queue(state, CommandKind.DELETE_OVERLAY, {"tag": tag})
 
 
-def add_layer(name: str, *, show: bool = True, map_tag: Tag | None = None) -> None:
+def _cache_target_states(map_tag: Tag | None) -> list[Any]:
+    if map_tag is not None:
+        return [get_map_state(map_tag)]
+    try:
+        return [get_map_state(None)]
+    except MapNotFoundError:
+        return list_map_states()
+
+
+def add_layer(
+    name: str,
+    *,
+    z_index: int | None = None,
+    show: bool = True,
+    map_tag: Tag | None = None,
+) -> None:
+    """Create or update a logical overlay layer."""
+
     state = get_map_state(map_tag)
     with state.lock:
-        layer = _ensure_layer(state, name, z_index=len(state.layers), show=show)
+        layer = _ensure_layer(
+            state,
+            name,
+            z_index=len(state.layers) if z_index is None else int(z_index),
+            show=show,
+        )
+        if z_index is not None:
+            layer.z_index = int(z_index)
         layer.show = show
         mark_dirty(state, DirtyFlags.OVERLAYS)
-        _queue(state, CommandKind.ADD_LAYER, {"name": name, "show": show})
+        _queue(
+            state,
+            CommandKind.ADD_LAYER,
+            {"name": name, "show": show, "z_index": layer.z_index},
+        )
 
 
 def show_layer(name: str, *, map_tag: Tag | None = None) -> None:
+    """Show all overlays assigned to a layer."""
+
     state = get_map_state(map_tag)
     with state.lock:
         _ensure_layer(state, name).show = True
@@ -424,6 +521,8 @@ def show_layer(name: str, *, map_tag: Tag | None = None) -> None:
 
 
 def hide_layer(name: str, *, map_tag: Tag | None = None) -> None:
+    """Hide all overlays assigned to a layer."""
+
     state = get_map_state(map_tag)
     with state.lock:
         _ensure_layer(state, name).show = False
@@ -432,6 +531,8 @@ def hide_layer(name: str, *, map_tag: Tag | None = None) -> None:
 
 
 def clear_layer(name: str, *, map_tag: Tag | None = None) -> None:
+    """Delete all overlays assigned to a layer."""
+
     state = get_map_state(map_tag)
     with state.lock:
         layer = _ensure_layer(state, name)
@@ -443,6 +544,8 @@ def clear_layer(name: str, *, map_tag: Tag | None = None) -> None:
 
 
 def clear_map(*, map_tag: Tag | None = None) -> None:
+    """Delete all overlays and invalidate map tile resources."""
+
     state = get_map_state(map_tag)
     with state.lock:
         state.overlays.clear()
@@ -454,36 +557,55 @@ def clear_map(*, map_tag: Tag | None = None) -> None:
 
 
 def set_provider(provider: str | TileProvider, *, map_tag: Tag | None = None) -> None:
-    provider_obj = get_provider(provider) if isinstance(provider, str) else provider
+    """Switch a map to another tile provider while preserving overlays."""
+
+    if isinstance(provider, str):
+        provider_obj = get_provider(provider)
+    elif isinstance(provider, TileProvider):
+        provider_obj = provider
+    else:
+        raise InvalidProviderError("provider must be a provider name or TileProvider")
     state = get_map_state(map_tag)
     with state.lock:
+        if state.provider == provider_obj:
+            return
         state.provider = provider_obj
-        state.min_zoom = max(state.min_zoom, provider_obj.min_zoom)
-        state.max_zoom = min(state.max_zoom, provider_obj.max_zoom)
+        state.min_zoom = provider_obj.min_zoom
+        state.max_zoom = provider_obj.max_zoom
         state.zoom = max(state.min_zoom, min(state.max_zoom, state.zoom))
         state.generation += 1
-        mark_dirty(state, DirtyFlags.PROVIDER | DirtyFlags.TILES)
+        mark_dirty(state, DirtyFlags.PROVIDER | DirtyFlags.TILES | DirtyFlags.OVERLAYS)
         _queue(state, CommandKind.SET_PROVIDER, {"provider": provider_obj.name})
 
 
 def clear_memory_cache(*, map_tag: Tag | None = None) -> None:
-    state = get_map_state(map_tag)
+    """Clear decoded in-memory tile data through the renderer command queue."""
+
+    for state in _cache_target_states(map_tag):
         with state.lock:
+            state.generation += 1
             mark_dirty(state, DirtyFlags.TILES)
             _queue(state, CommandKind.CLEAR_MEMORY_CACHE, {})
 
 
-def clear_disk_cache(*, map_tag: Tag | None = None) -> None:
+def clear_disk_cache(provider: str | None = None, *, map_tag: Tag | None = None) -> None:
+    """Clear persistent tile cache data globally or for one map/provider."""
+
+    if provider is not None:
+        get_provider(provider)
     if map_tag is None:
-        clear_disk_cache_path(get_config().cache_dir)
+        clear_disk_cache_path(get_config().cache_dir, provider=provider)
         return
     state = get_map_state(map_tag)
     with state.lock:
+        state.generation += 1
         mark_dirty(state, DirtyFlags.TILES)
-        _queue(state, CommandKind.CLEAR_DISK_CACHE, {})
+        _queue(state, CommandKind.CLEAR_DISK_CACHE, {"provider": provider})
 
 
 def get_cache_stats(*, map_tag: Tag | None = None) -> CacheStats:
+    """Return memory and disk cache diagnostics."""
+
     config = get_config()
     if map_tag is None:
         cache_dir = config.cache_dir
@@ -510,6 +632,8 @@ def get_cache_stats(*, map_tag: Tag | None = None) -> CacheStats:
 
 
 def get_map_debug_state(*, map_tag: Tag | None = None) -> dict[str, Any]:
+    """Return a diagnostic snapshot for a map."""
+
     state = get_map_state(map_tag)
     with state.lock:
         return {
@@ -533,5 +657,6 @@ def get_map_debug_state(*, map_tag: Tag | None = None) -> dict[str, Any]:
             "pending_command_count": len(state.command_queue),
             "generation": state.generation,
             "active_drag": state.interaction.active_drag,
+            "last_mouse_position": state.interaction.last_mouse_position,
             "tiles": asdict(state.tile_manager.snapshot()),
         }

src/dpg_map/cache.py

@@ -225,10 +225,20 @@ def scan_disk_cache(cache_dir: str | Path | None) -> list[DiskCacheEntry]:
     return entries
 
 
-def disk_cache_size_bytes(cache_dir: str | Path | None) -> int:
-    """Return total bytes for cached tile files."""
+def disk_cache_size_bytes(
+    cache_dir: str | Path | None,
+    *,
+    provider: str | None = None,
+) -> int:
+    """Return total bytes for cached tile files, optionally scoped to one provider."""
 
+    if provider is None:
         return sum(entry.metadata.size_bytes for entry in scan_disk_cache(cache_dir))
+    safe_provider = provider.replace("/", "_")
+    provider_root = disk_cache_root(cache_dir) / safe_provider
+    if not provider_root.exists():
+        return 0
+    return sum(entry.metadata.size_bytes for entry in scan_disk_cache(provider_root))
 
 
 def plan_disk_prune(
@@ -277,10 +287,12 @@ def prune_disk_cache(
     return planned
 
 
-def clear_disk_cache_path(cache_dir: str | Path | None) -> None:
-    """Remove all persistent tile cache files under a cache root."""
+def clear_disk_cache_path(cache_dir: str | Path | None, *, provider: str | None = None) -> None:
+    """Remove persistent tile cache files under a cache root."""
 
     root = disk_cache_root(cache_dir)
+    if provider is not None:
+        root = root / provider.replace("/", "_")
     if not root.exists():
         return
     try:

src/dpg_map/draw_layers.py

@@ -1 +1,46 @@
 """Draw layer bookkeeping helpers."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any
+
+from .types import Tag
+
+
+@dataclass(frozen=True, slots=True)
+class DrawLayerTags:
+    """Internal Dear PyGui draw layer tags for one map."""
+
+    background: str
+    tiles: str
+    overlays: str
+    attribution: str
+
+
+def draw_layer_tags(map_tag: Tag) -> DrawLayerTags:
+    """Return stable internal draw layer tags for a map."""
+
+    return DrawLayerTags(
+        background=f"{map_tag}##layer-background",
+        tiles=f"{map_tag}##layer-tiles",
+        overlays=f"{map_tag}##layer-overlays",
+        attribution=f"{map_tag}##layer-attribution",
+    )
+
+
+def ensure_draw_layers(dpg: Any, *, drawlist_tag: Tag, map_tag: Tag) -> DrawLayerTags:
+    """Create draw layers if needed and return their tags."""
+
+    tags = draw_layer_tags(map_tag)
+    for layer_tag in (tags.background, tags.tiles, tags.overlays, tags.attribution):
+        if not dpg.does_item_exist(layer_tag):
+            dpg.add_draw_layer(parent=drawlist_tag, tag=layer_tag)
+    return tags
+
+
+def clear_draw_layer(dpg: Any, layer_tag: Tag) -> None:
+    """Clear one draw layer without touching sibling layers."""
+
+    if dpg.does_item_exist(layer_tag):
+        dpg.delete_item(layer_tag, children_only=True)

src/dpg_map/interaction.py

@@ -3,9 +3,18 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
+from math import isfinite
+from threading import RLock
+from typing import Any
 
+from .commands import CommandKind, MapCommand
+from .projection import latlon_to_world, screen_to_world, world_to_latlon
 from .sizing import effective_draw_size
-from .state import MapState
+from .state import DirtyFlags, MapState, mark_dirty
+from .types import LatLon, Point, Tag
+
+_drag_owner_lock = RLock()
+_drag_owner_map: Tag | None = None
 
 
 @dataclass(frozen=True, slots=True)
@@ -34,3 +43,215 @@ def calculate_hit_rect(state: MapState, drawlist_pos: tuple[float, float]) -> Hi
 
     width, height = effective_draw_size(state)
     return HitRect(float(drawlist_pos[0]), float(drawlist_pos[1]), float(width), float(height))
+
+
+def screen_to_latlon_in_state(state: MapState, x: float, y: float) -> LatLon:
+    """Convert map-local screen coordinates to latitude/longitude."""
+
+    with state.lock:
+        width, height = effective_draw_size(state)
+        center = state.center
+        zoom = state.zoom
+        tile_size = state.provider.tile_size
+    world_x, world_y = screen_to_world(
+        float(x),
+        float(y),
+        center=center,
+        zoom=zoom,
+        width=width,
+        height=height,
+        tile_size=tile_size,
+    )
+    return world_to_latlon(world_x, world_y, zoom, tile_size)
+
+
+def latlon_to_screen_in_state(state: MapState, lat: float, lon: float) -> Point:
+    """Convert latitude/longitude to map-local screen coordinates."""
+
+    with state.lock:
+        width, height = effective_draw_size(state)
+        center = state.center
+        zoom = state.zoom
+        tile_size = state.provider.tile_size
+    world_x, world_y = latlon_to_world(lat, lon, zoom, tile_size)
+    center_x, center_y = latlon_to_world(center[0], center[1], zoom, tile_size)
+    return (world_x - center_x + width / 2.0, world_y - center_y + height / 2.0)
+
+
+def pan_state_by_pixels(state: MapState, dx: float, dy: float) -> LatLon:
+    """Pan the map by a mouse drag delta in screen pixels."""
+
+    with state.lock:
+        if dx == 0 and dy == 0:
+            return state.center
+        center = state.center
+        zoom = state.zoom
+        tile_size = state.provider.tile_size
+        world_size = tile_size * (2**zoom)
+        center_x, center_y = latlon_to_world(center[0], center[1], zoom, tile_size)
+        new_x = (center_x - dx) % world_size
+        new_y = min(max(center_y - dy, 0.0), float(world_size))
+        state.center = world_to_latlon(new_x, new_y, zoom, tile_size)
+        mark_dirty(state, DirtyFlags.VIEW | DirtyFlags.TILES | DirtyFlags.OVERLAYS)
+        state.command_queue.put(
+            MapCommand(
+                kind=CommandKind.SET_VIEW,
+                map_tag=state.tag,
+                payload={"center": state.center},
+            )
+        )
+        return state.center
+
+
+def zoom_state_at_screen_point(
+    state: MapState,
+    *,
+    screen_x: float,
+    screen_y: float,
+    delta: float,
+) -> int:
+    """Zoom the map around a map-local screen point where possible."""
+
+    if delta == 0 or not isfinite(delta):
+        with state.lock:
+            return state.zoom
+
+    with state.lock:
+        old_zoom = state.zoom
+        new_zoom = max(state.min_zoom, min(state.max_zoom, old_zoom + (1 if delta > 0 else -1)))
+        if new_zoom == old_zoom:
+            return old_zoom
+
+        width, height = effective_draw_size(state)
+        tile_size = state.provider.tile_size
+        anchor_latlon = screen_to_latlon_in_state(state, screen_x, screen_y)
+        anchor_x, anchor_y = latlon_to_world(
+            anchor_latlon[0],
+            anchor_latlon[1],
+            new_zoom,
+            tile_size,
+        )
+        world_size = tile_size * (2**new_zoom)
+        center_x = (anchor_x - (screen_x - width / 2.0)) % world_size
+        center_y = min(max(anchor_y - (screen_y - height / 2.0), 0.0), float(world_size))
+
+        state.zoom = new_zoom
+        state.center = world_to_latlon(center_x, center_y, new_zoom, tile_size)
+        mark_dirty(state, DirtyFlags.VIEW | DirtyFlags.TILES | DirtyFlags.OVERLAYS)
+        state.command_queue.put(
+            MapCommand(
+                kind=CommandKind.SET_VIEW,
+                map_tag=state.tag,
+                payload={"center": state.center, "zoom": state.zoom},
+            )
+        )
+        return state.zoom
+
+
+def handle_mouse_down(state: MapState, mouse_pos: tuple[float, float], hit_rect: HitRect) -> None:
+    """Begin a drag if the left mouse button starts inside the map rectangle."""
+
+    with state.lock:
+        if not state.is_visible or not hit_rect.contains(mouse_pos[0], mouse_pos[1]):
+            state.interaction.active_drag = False
+            state.interaction.last_mouse_position = None
+            return
+    with _drag_owner_lock:
+        global _drag_owner_map
+        if _drag_owner_map is not None and _drag_owner_map != state.tag:
+            return
+        _drag_owner_map = state.tag
+    with state.lock:
+        state.interaction.active_drag = True
+        state.interaction.last_mouse_position = mouse_pos
+
+
+def handle_mouse_drag(state: MapState, mouse_pos: tuple[float, float]) -> None:
+    """Update center from a mouse drag event."""
+
+    with _drag_owner_lock:
+        if _drag_owner_map != state.tag:
+            return
+    with state.lock:
+        if not state.interaction.active_drag:
+            return
+        last_pos = state.interaction.last_mouse_position
+        state.interaction.last_mouse_position = mouse_pos
+    if last_pos is None:
+        return
+    pan_state_by_pixels(state, mouse_pos[0] - last_pos[0], mouse_pos[1] - last_pos[1])
+
+
+def handle_mouse_release(state: MapState) -> None:
+    """End any active drag."""
+
+    with _drag_owner_lock:
+        global _drag_owner_map
+        if _drag_owner_map == state.tag:
+            _drag_owner_map = None
+    with state.lock:
+        state.interaction.active_drag = False
+        state.interaction.last_mouse_position = None
+
+
+def handle_mouse_wheel(
+    state: MapState,
+    *,
+    mouse_pos: tuple[float, float],
+    wheel_delta: float,
+    hit_rect: HitRect,
+) -> None:
+    """Apply wheel zoom when the cursor is over the concrete map rectangle."""
+
+    with state.lock:
+        if not state.is_visible:
+            return
+    if not hit_rect.contains(mouse_pos[0], mouse_pos[1]):
+        return
+    zoom_state_at_screen_point(
+        state,
+        screen_x=mouse_pos[0] - hit_rect.x,
+        screen_y=mouse_pos[1] - hit_rect.y,
+        delta=wheel_delta,
+    )
+
+
+def update_drag_from_button_state(
+    state: MapState,
+    *,
+    mouse_pos: tuple[float, float],
+    hit_rect: HitRect,
+    is_down: bool,
+    can_start: bool = True,
+) -> None:
+    """Poll left-button state and keep drag interaction moving."""
+
+    with state.lock:
+        active_drag = state.interaction.active_drag
+
+    if not is_down:
+        if active_drag:
+            handle_mouse_release(state)
+        return
+
+    if active_drag:
+        handle_mouse_drag(state, mouse_pos)
+        return
+
+    if not can_start:
+        return
+
+    if hit_rect.contains(mouse_pos[0], mouse_pos[1]):
+        handle_mouse_down(state, mouse_pos, hit_rect)
+
+
+def wheel_delta_from_app_data(app_data: Any) -> float:
+    """Normalize Dear PyGui mouse wheel callback data."""
+
+    if isinstance(app_data, int | float):
+        return float(app_data)
+    if isinstance(app_data, (list, tuple)) and app_data:
+        value = app_data[-1]
+        if isinstance(value, int | float):
+            return float(value)
+    return 0.0

src/dpg_map/renderer.py

@@ -3,13 +3,24 @@
 from __future__ import annotations
 
 from collections.abc import Callable
+from dataclasses import replace
+from threading import RLock
 from typing import Any
 
 from .commands import CommandKind, MapCommand
-from .interaction import HitRect, calculate_hit_rect
+from .draw_layers import DrawLayerTags, clear_draw_layer, ensure_draw_layers
+from .interaction import HitRect, calculate_hit_rect, update_drag_from_button_state
+from .overlays import MarkerOverlay, Overlay, PolylineOverlay, TrajectoryOverlay
+from .projection import latlon_to_world
 from .sizing import SizeMeasurement, apply_size_measurement
 from .state import DirtyFlags, MapState
 from .tiles import Tile, VisibleTile
+from .types import Color, LatLon, Tag
+
+_scheduler_lock = RLock()
+_scheduled_renderers: dict[Tag, MapRenderer] = {}
+_scheduler_dpg: Any | None = None
+_scheduler_frame_scheduled = False
 
 
 class MapRenderer:
@@ -18,29 +29,21 @@ class MapRenderer:
     def __init__(self, state: MapState, dpg: Any) -> None:
         self.state = state
         self._dpg = dpg
-        self._background_tag = f"{state.tag}##background"
-        self._attribution_tag = f"{state.tag}##attribution"
+        self._layers: DrawLayerTags | None = None
         self.last_drained_commands: tuple[MapCommand, ...] = ()
         self.last_hit_rect: HitRect | None = None
+        self.last_overlay_count: int = 0
 
     def schedule_next_frame(self) -> None:
-        """Schedule this renderer to run on the next Dear PyGui frame."""
+        """Register this renderer with the shared Dear PyGui frame pump."""
 
-        with self.state.lock:
-            if self.state.frame_scheduled:
-                return
-            self.state.frame_scheduled = True
-        frame = self._dpg.get_frame_count() + 1
-        self._dpg.set_frame_callback(frame, self._frame_callback)
+        _schedule_renderer(self)
 
     def _frame_callback(self, sender: Any | None = None, app_data: Any | None = None) -> None:
         _ = (sender, app_data)
-        with self.state.lock:
-            self.state.frame_scheduled = False
         if not self._dpg.does_item_exist(self.state.drawlist_tag):
             return
         self.render_frame()
-        self.schedule_next_frame()
 
     def render_frame(self) -> None:
         """Drain pending commands, refresh size, process tiles, and redraw."""
@@ -48,10 +51,12 @@ class MapRenderer:
         commands = drain_renderer_commands(self.state)
         self.last_drained_commands = tuple(commands)
         self._update_size_from_dpg()
+        self._poll_mouse_drag()
 
         with self.state.lock:
             dirty = self.state.dirty
-            should_draw = bool(dirty & (DirtyFlags.FULL | DirtyFlags.SIZE | DirtyFlags.TILES))
+            draw_tiles = bool(dirty & (DirtyFlags.SIZE | DirtyFlags.TILES | DirtyFlags.PROVIDER))
+            draw_overlays = bool(dirty & (DirtyFlags.SIZE | DirtyFlags.OVERLAYS))
             visible = self.state.is_visible
             width = self.state.measured_width or self.state.last_nonzero_width
             height = self.state.measured_height or self.state.last_nonzero_height
@@ -61,6 +66,12 @@ class MapRenderer:
             zoom = self.state.zoom
             generation = self.state.generation
             cache_dir = self.state.cache_dir
+            overlays = tuple(
+                _copy_overlay_for_render(overlay) for overlay in self.state.overlays.values()
+            )
+            layers = {
+                name: (layer.show, layer.z_index) for name, layer in self.state.layers.items()
+            }
             self.state.dirty = DirtyFlags.NONE
 
         accepted_tiles = self.state.tile_manager.drain_results(
@@ -84,7 +95,7 @@ class MapRenderer:
                 margin=self._prefetch_margin(),
             )
 
-        if visible and (should_draw or accepted_tiles):
+        if visible and (draw_tiles or accepted_tiles):
             self._draw_tile_layer(
                 visible_tiles=visible_tiles,
                 width=width,
@@ -92,6 +103,16 @@ class MapRenderer:
                 attribution=provider_attribution,
                 tile_size=provider.tile_size,
             )
+        if visible and draw_overlays:
+            self._draw_overlay_layer(
+                overlays=overlays,
+                layers=layers,
+                center=center,
+                zoom=zoom,
+                width=width,
+                height=height,
+                tile_size=provider.tile_size,
+            )
 
     def _update_size_from_dpg(self) -> None:
         width, height = self._measure_child_content()
@@ -104,10 +125,28 @@ class MapRenderer:
             draw_width = update.effective_width
             draw_height = update.effective_height
         self._dpg.configure_item(self.state.drawlist_tag, width=draw_width, height=draw_height)
-        draw_pos = tuple(float(value) for value in self._dpg.get_item_pos(self.state.drawlist_tag))
+        draw_pos = tuple(
+            float(value) for value in self._dpg.get_item_rect_min(self.state.drawlist_tag)
+        )
         with self.state.lock:
             self.last_hit_rect = calculate_hit_rect(self.state, (draw_pos[0], draw_pos[1]))
 
+    def _poll_mouse_drag(self) -> None:
+        if self.last_hit_rect is None:
+            return
+        try:
+            is_down = bool(self._dpg.is_mouse_button_down(self._dpg.mvMouseButton_Left))
+            mouse_pos = self._dpg.get_mouse_pos(local=False)
+        except Exception:
+            return
+        update_drag_from_button_state(
+            self.state,
+            mouse_pos=(float(mouse_pos[0]), float(mouse_pos[1])),
+            hit_rect=self.last_hit_rect,
+            is_down=is_down,
+            can_start=False,
+        )
+
     def _measure_child_content(self) -> tuple[int, int]:
         try:
             width, height = self._dpg.get_item_rect_size(self.state.child_window_tag)
@@ -126,12 +165,14 @@ class MapRenderer:
     ) -> None:
         width = max(1, int(width))
         height = max(1, int(height))
-        self._dpg.delete_item(self.state.drawlist_tag, children_only=True)
+        layers = self._ensure_draw_layers()
+        clear_draw_layer(self._dpg, layers.background)
+        clear_draw_layer(self._dpg, layers.tiles)
+        clear_draw_layer(self._dpg, layers.attribution)
         self._dpg.draw_rectangle(
             (0, 0),
             (width, height),
-            parent=self.state.drawlist_tag,
-            tag=self._background_tag,
+            parent=layers.background,
             color=(54, 68, 78, 255),
             fill=(29, 38, 45, 255),
         )
@@ -139,25 +180,199 @@ class MapRenderer:
             tile = self.state.tile_manager.get_ready_tile(visible_tile.tile_id)
             if tile is None or tile.texture_tag is None:
                 continue
-            screen_x = visible_tile.screen_x
-            screen_y = visible_tile.screen_y
+            screen_x = _snap_tile_position(visible_tile.screen_x)
+            screen_y = _snap_tile_position(visible_tile.screen_y)
             self._dpg.draw_image(
                 tile.texture_tag,
                 (screen_x, screen_y),
                 (screen_x + tile_size, screen_y + tile_size),
-                parent=self.state.drawlist_tag,
+                parent=layers.tiles,
             )
         label = attribution or "Map tiles"
         text_y = max(28, height - 24)
         self._dpg.draw_text(
             (12, text_y),
             label,
-            parent=self.state.drawlist_tag,
-            tag=self._attribution_tag,
+            parent=layers.attribution,
             color=(172, 184, 192, 255),
             size=12,
         )
 
+    def _draw_overlay_layer(
+        self,
+        *,
+        overlays: tuple[Overlay, ...],
+        layers: dict[str, tuple[bool, int]],
+        center: LatLon,
+        zoom: int,
+        width: int,
+        height: int,
+        tile_size: int,
+    ) -> None:
+        draw_layers = self._ensure_draw_layers()
+        clear_draw_layer(self._dpg, draw_layers.overlays)
+        if width <= 0 or height <= 0:
+            self.last_overlay_count = 0
+            return
+
+        center_x, center_y = latlon_to_world(center[0], center[1], zoom, tile_size)
+        visible_overlays = [
+            overlay
+            for overlay in overlays
+            if overlay.show and layers.get(overlay.layer, (True, 0))[0]
+        ]
+        visible_overlays.sort(key=lambda overlay: layers.get(overlay.layer, (True, 0))[1])
+        drawn = 0
+        for overlay in visible_overlays:
+            if isinstance(overlay, MarkerOverlay):
+                self._draw_marker_overlay(
+                    overlay, center_x, center_y, zoom, width, height, tile_size
+                )
+                drawn += 1
+            elif isinstance(overlay, PolylineOverlay):
+                self._draw_polyline_overlay(
+                    overlay,
+                    center_x,
+                    center_y,
+                    zoom,
+                    width,
+                    height,
+                    tile_size,
+                    draw_layers.overlays,
+                )
+                drawn += 1
+            elif isinstance(overlay, TrajectoryOverlay):
+                self._draw_trajectory_overlay(
+                    overlay,
+                    center_x,
+                    center_y,
+                    zoom,
+                    width,
+                    height,
+                    tile_size,
+                    draw_layers.overlays,
+                )
+                drawn += 1
+        self.last_overlay_count = drawn
+
+    def _draw_marker_overlay(
+        self,
+        overlay: MarkerOverlay,
+        center_x: float,
+        center_y: float,
+        zoom: int,
+        width: int,
+        height: int,
+        tile_size: int,
+    ) -> None:
+        layers = self._ensure_draw_layers()
+        x, y = _latlon_to_screen(
+            overlay.lat,
+            overlay.lon,
+            center_x,
+            center_y,
+            zoom,
+            width,
+            height,
+            tile_size,
+        )
+        radius = max(1.0, float(overlay.radius))
+        self._dpg.draw_circle(
+            (x, y),
+            radius,
+            parent=layers.overlays,
+            color=(255, 255, 255, 230),
+            fill=_rgba(overlay.color),
+            thickness=1.5,
+            segments=20,
+        )
+        if overlay.show_label and overlay.label:
+            self._dpg.draw_text(
+                (x + radius + 4.0, y - 7.0),
+                overlay.label,
+                parent=layers.overlays,
+                color=(245, 248, 250, 255),
+                size=12,
+            )
+
+    def _draw_polyline_overlay(
+        self,
+        overlay: PolylineOverlay,
+        center_x: float,
+        center_y: float,
+        zoom: int,
+        width: int,
+        height: int,
+        tile_size: int,
+        parent: str,
+    ) -> None:
+        points = _screen_points(
+            overlay.points,
+            center_x=center_x,
+            center_y=center_y,
+            zoom=zoom,
+            width=width,
+            height=height,
+            tile_size=tile_size,
+        )
+        if len(points) < 2:
+            return
+        self._dpg.draw_polyline(
+            points,
+            parent=parent,
+            closed=overlay.closed,
+            color=_rgba(overlay.color),
+            thickness=max(1.0, float(overlay.thickness)),
+        )
+
+    def _draw_trajectory_overlay(
+        self,
+        overlay: TrajectoryOverlay,
+        center_x: float,
+        center_y: float,
+        zoom: int,
+        width: int,
+        height: int,
+        tile_size: int,
+        parent: str,
+    ) -> None:
+        points = _screen_points(
+            overlay.points,
+            center_x=center_x,
+            center_y=center_y,
+            zoom=zoom,
+            width=width,
+            height=height,
+            tile_size=tile_size,
+        )
+        if len(points) >= 2:
+            self._dpg.draw_polyline(
+                points,
+                parent=parent,
+                color=_rgba(overlay.color),
+                thickness=max(1.0, float(overlay.thickness)),
+            )
+        if overlay.show_points and points:
+            stride = max(1, int(overlay.point_stride))
+            for point in points[::stride]:
+                self._dpg.draw_circle(
+                    point,
+                    2.5,
+                    parent=parent,
+                    color=_rgba(overlay.color),
+                    fill=_rgba(overlay.color),
+                    segments=8,
+                )
+
+    def _ensure_draw_layers(self) -> DrawLayerTags:
+        if self._layers is None or not self._dpg.does_item_exist(self._layers.overlays):
+            self._layers = ensure_draw_layers(
+                self._dpg,
+                drawlist_tag=self.state.drawlist_tag,
+                map_tag=self.state.tag,
+            )
+        return self._layers
+
     def _ensure_texture(self, tile: Tile) -> None:
         if tile.texture_tag is not None:
             return
@@ -186,6 +401,54 @@ class MapRenderer:
         return get_config().prefetch_margin_tiles
 
 
+def _schedule_renderer(renderer: MapRenderer) -> None:
+    """Schedule the shared frame pump for all registered map renderers."""
+
+    global _scheduler_dpg, _scheduler_frame_scheduled
+
+    with _scheduler_lock:
+        _scheduled_renderers[renderer.state.tag] = renderer
+        _scheduler_dpg = renderer._dpg
+        if _scheduler_frame_scheduled:
+            return
+        _scheduler_frame_scheduled = True
+        dpg = renderer._dpg
+
+    frame = dpg.get_frame_count() + 1
+    dpg.set_frame_callback(frame, _shared_frame_callback)
+
+
+def _shared_frame_callback(sender: Any | None = None, app_data: Any | None = None) -> None:
+    """Render every live map from one Dear PyGui frame callback."""
+
+    _ = (sender, app_data)
+    global _scheduler_frame_scheduled
+
+    with _scheduler_lock:
+        renderers = tuple(_scheduled_renderers.values())
+        _scheduler_frame_scheduled = False
+
+    for renderer in renderers:
+        renderer._frame_callback()
+
+    with _scheduler_lock:
+        active_renderers = [
+            renderer
+            for renderer in _scheduled_renderers.values()
+            if renderer._dpg.does_item_exist(renderer.state.drawlist_tag)
+        ]
+        _scheduled_renderers.clear()
+        _scheduled_renderers.update((renderer.state.tag, renderer) for renderer in active_renderers)
+        if not active_renderers or _scheduler_frame_scheduled:
+            return
+        _scheduler_frame_scheduled = True
+        dpg = _scheduler_dpg
+
+    if dpg is not None:
+        frame = dpg.get_frame_count() + 1
+        dpg.set_frame_callback(frame, _shared_frame_callback)
+
+
 def drain_renderer_commands(state: MapState) -> list[MapCommand]:
     """Drain and apply GUI-thread command side effects."""
 
@@ -199,7 +462,7 @@ def drain_renderer_commands(state: MapState) -> list[MapCommand]:
                 state.dirty |= DirtyFlags.VIEW | DirtyFlags.TILES | DirtyFlags.OVERLAYS
             elif command.kind is CommandKind.SET_PROVIDER:
                 state.tile_manager.clear_memory_cache()
-                state.dirty |= DirtyFlags.PROVIDER | DirtyFlags.TILES
+                state.dirty |= DirtyFlags.PROVIDER | DirtyFlags.TILES | DirtyFlags.OVERLAYS
             elif command.kind in {
                 CommandKind.ADD_OVERLAY,
                 CommandKind.UPDATE_OVERLAY,
@@ -216,7 +479,10 @@ def drain_renderer_commands(state: MapState) -> list[MapCommand]:
                 state.tile_manager.clear_memory_cache()
                 state.dirty |= DirtyFlags.TILES
             elif command.kind is CommandKind.CLEAR_DISK_CACHE:
-                state.tile_manager.clear_disk_cache(state.cache_dir)
+                provider = command.payload.get("provider")
+                if not isinstance(provider, str):
+                    provider = None
+                state.tile_manager.clear_disk_cache(state.cache_dir, provider=provider)
                 state.dirty |= DirtyFlags.TILES
     return commands
 
@@ -229,3 +495,47 @@ def make_frame_pump(state: MapState, dpg: Any) -> Callable[[], None]:
         state.renderer = renderer
     renderer.schedule_next_frame()
     return renderer.render_frame
+
+
+def _rgba(color: Color) -> tuple[int, int, int, int]:
+    if len(color) == 3:
+        return (int(color[0]), int(color[1]), int(color[2]), 255)
+    return (int(color[0]), int(color[1]), int(color[2]), int(color[3]))
+
+
+def _snap_tile_position(value: float) -> int:
+    return int(round(value))
+
+
+def _latlon_to_screen(
+    lat: float,
+    lon: float,
+    center_x: float,
+    center_y: float,
+    zoom: int,
+    width: int,
+    height: int,
+    tile_size: int,
+) -> tuple[float, float]:
+    world_x, world_y = latlon_to_world(lat, lon, zoom, tile_size)
+    return (world_x - center_x + width / 2.0, world_y - center_y + height / 2.0)
+
+
+def _screen_points(
+    points: tuple[LatLon, ...],
+    *,
+    center_x: float,
+    center_y: float,
+    zoom: int,
+    width: int,
+    height: int,
+    tile_size: int,
+) -> list[tuple[float, float]]:
+    return [
+        _latlon_to_screen(lat, lon, center_x, center_y, zoom, width, height, tile_size)
+        for lat, lon in points
+    ]
+
+
+def _copy_overlay_for_render(overlay: Overlay) -> Overlay:
+    return replace(overlay)

src/dpg_map/state.py

@@ -47,7 +47,7 @@ class DpgMapConfig:
 
 @dataclass(slots=True)
 class InteractionState:
-    """Logical interaction state until GUI interaction is implemented."""
+    """Logical mouse interaction state."""
 
     active_drag: bool = False
     last_mouse_position: tuple[float, float] | None = None
@@ -276,6 +276,13 @@ def resolve_map_tag(map_tag: Tag | None = None) -> Tag:
     raise MapNotFoundError("map_tag is required outside a map_widget context")
 
 
+def list_map_states() -> list[MapState]:
+    """Return registered map states as a snapshot."""
+
+    with _maps_lock:
+        return list(_maps.values())
+
+
 def find_map_for_overlay(tag: Tag, map_tag: Tag | None = None) -> MapState:
     """Find the map containing an overlay, optionally scoped by map tag."""
 

src/dpg_map/tiles.py

@@ -316,7 +316,7 @@ class TileManager:
                 RuntimeWarning,
                 stacklevel=3,
             )
-        headers["User-Agent"] = "dpg-map/0.1"
+        headers["User-Agent"] = "dpg-map/1.0.0"
         return headers
 
     def _visible_disk_paths(self, cache_dir: str | Path | None) -> list[Path]:
@@ -428,10 +428,12 @@ class TileManager:
             self._failed.clear()
             return tags
 
-    def clear_disk_cache(self, cache_dir: str | Path | None) -> None:
-        """Clear the persistent cache root."""
+    def clear_disk_cache(
+        self, cache_dir: str | Path | None, *, provider: str | None = None
+    ) -> None:
+        """Clear the persistent cache root or one provider namespace."""
 
-        clear_disk_cache_path(cache_dir)
+        clear_disk_cache_path(cache_dir, provider=provider)
 
     def snapshot(self) -> TileManagerSnapshot:
         """Return diagnostic counters."""

src/dpg_map/widget.py

@@ -7,6 +7,14 @@ from contextlib import contextmanager
 from pathlib import Path
 from typing import Any
 
+from .interaction import (
+    calculate_hit_rect,
+    handle_mouse_down,
+    handle_mouse_drag,
+    handle_mouse_release,
+    handle_mouse_wheel,
+    wheel_delta_from_app_data,
+)
 from .providers import TileProvider
 from .renderer import MapRenderer
 from .state import create_map_state, current_map_context
@@ -63,6 +71,64 @@ def map_widget(
     )
     dpg.add_texture_registry(tag=state.texture_registry_tag)
     dpg.add_drawlist(1, 1, tag=state.drawlist_tag, parent=state.child_window_tag)
+    dpg.add_handler_registry(tag=state.handler_registry_tag)
+
+    def _mouse_pos() -> tuple[float, float]:
+        pos = dpg.get_mouse_pos(local=False)
+        return (float(pos[0]), float(pos[1]))
+
+    def _hit_rect() -> Any:
+        draw_pos = tuple(float(value) for value in dpg.get_item_rect_min(state.drawlist_tag))
+        return calculate_hit_rect(state, (draw_pos[0], draw_pos[1]))
+
+    def _is_drawlist_hovered() -> bool:
+        try:
+            return bool(dpg.is_item_hovered(state.drawlist_tag))
+        except Exception:
+            return False
+
+    def _on_mouse_down(sender: Any, app_data: Any, user_data: Any) -> None:
+        _ = (sender, app_data, user_data)
+        if not _is_drawlist_hovered():
+            return
+        handle_mouse_down(state, _mouse_pos(), _hit_rect())
+
+    def _on_mouse_drag(sender: Any, app_data: Any, user_data: Any) -> None:
+        _ = (sender, app_data, user_data)
+        handle_mouse_drag(state, _mouse_pos())
+
+    def _on_mouse_release(sender: Any, app_data: Any, user_data: Any) -> None:
+        _ = (sender, app_data, user_data)
+        handle_mouse_release(state)
+
+    def _on_mouse_wheel(sender: Any, app_data: Any, user_data: Any) -> None:
+        _ = (sender, user_data)
+        if not _is_drawlist_hovered():
+            return
+        handle_mouse_wheel(
+            state,
+            mouse_pos=_mouse_pos(),
+            wheel_delta=wheel_delta_from_app_data(app_data),
+            hit_rect=_hit_rect(),
+        )
+
+    dpg.add_mouse_down_handler(
+        button=dpg.mvMouseButton_Left,
+        callback=_on_mouse_down,
+        parent=state.handler_registry_tag,
+    )
+    dpg.add_mouse_drag_handler(
+        button=dpg.mvMouseButton_Left,
+        threshold=0.0,
+        callback=_on_mouse_drag,
+        parent=state.handler_registry_tag,
+    )
+    dpg.add_mouse_release_handler(
+        button=dpg.mvMouseButton_Left,
+        callback=_on_mouse_release,
+        parent=state.handler_registry_tag,
+    )
+    dpg.add_mouse_wheel_handler(callback=_on_mouse_wheel, parent=state.handler_registry_tag)
 
     renderer = MapRenderer(state, dpg)
     with state.lock:

tests/test_cache.py

@@ -7,6 +7,8 @@ from dpg_map.cache import (
     DiskCacheConfig,
     DiskCacheMetadata,
     MemoryCacheConfig,
+    clear_disk_cache_path,
+    disk_cache_size_bytes,
     plan_disk_prune,
     tile_cache_path,
     write_disk_metadata,
@@ -66,3 +68,23 @@ def test_disk_cache_prune_ordering(tmp_path: Path) -> None:
     planned = plan_disk_prune(tmp_path, 5, protected_paths={protected})
 
     assert planned == [first, second]
+
+
+def test_provider_scoped_disk_cache_clear(tmp_path: Path) -> None:
+    osm = tile_cache_path(tmp_path, "osm", 1, 1, 1)
+    custom = tile_cache_path(tmp_path, "custom", 1, 1, 1)
+    for path in (osm, custom):
+        path.parent.mkdir(parents=True, exist_ok=True)
+        path.write_bytes(b"abcde")
+        write_disk_metadata(
+            path.with_suffix(".json"),
+            DiskCacheMetadata(url=str(path), last_accessed_at=1.0, size_bytes=5),
+        )
+
+    assert disk_cache_size_bytes(tmp_path, provider="osm") == 5
+
+    clear_disk_cache_path(tmp_path, provider="osm")
+
+    assert not osm.exists()
+    assert custom.exists()
+    assert disk_cache_size_bytes(tmp_path) == 5

tests/test_hardening.py

@@ -0,0 +1,140 @@
+from __future__ import annotations
+
+from math import nan
+
+import pytest
+
+import dpg_map as dpgm
+from dpg_map.commands import CommandKind
+from dpg_map.exceptions import (
+    CoordinateError,
+    MapNotFoundError,
+    OverlayNotFoundError,
+    ProviderNotFoundError,
+)
+from dpg_map.overlays import TrajectoryOverlay
+from dpg_map.providers import TileProvider
+from dpg_map.renderer import drain_renderer_commands
+from dpg_map.state import DirtyFlags, InteractionState, create_map_state, get_map_state
+from dpg_map.tiles import TileID, TileResult, TileStatus
+
+
+def test_public_callables_have_docstrings() -> None:
+    for name in dpgm.__all__:
+        value = getattr(dpgm, name)
+        if callable(value):
+            assert value.__doc__, name
+
+
+def test_unknown_map_raises_public_error() -> None:
+    with pytest.raises(MapNotFoundError):
+        dpgm.get_center(map_tag="missing-map")
+
+
+def test_unknown_overlay_raises_public_error() -> None:
+    create_map_state(tag="missing-overlay")
+
+    with pytest.raises(OverlayNotFoundError):
+        dpgm.update_marker("vehicle", lat=47.0, lon=2.0, map_tag="missing-overlay")
+
+
+def test_unknown_provider_raises_public_error() -> None:
+    create_map_state(tag="missing-provider")
+
+    with pytest.raises(ProviderNotFoundError):
+        dpgm.set_provider("missing-provider-name", map_tag="missing-provider")
+
+
+def test_invalid_coordinates_raise_public_error() -> None:
+    create_map_state(tag="invalid-coordinates")
+
+    with pytest.raises(CoordinateError):
+        dpgm.add_marker("bad-lat", lat=91.0, lon=2.0, map_tag="invalid-coordinates")
+    with pytest.raises(CoordinateError):
+        dpgm.set_center(nan, 2.0, map_tag="invalid-coordinates")
+
+
+def test_mismatched_polyline_lat_lon_lengths_raise_public_error() -> None:
+    create_map_state(tag="mismatched-polyline")
+
+    with pytest.raises(CoordinateError):
+        dpgm.add_polyline("line", lats=[47.0, 47.1], lons=[2.0], map_tag="mismatched-polyline")
+
+
+def test_empty_trajectory_is_valid_for_live_updates() -> None:
+    create_map_state(tag="empty-trajectory")
+
+    dpgm.add_trajectory("track", points=[], map_tag="empty-trajectory")
+
+    state = get_map_state("empty-trajectory")
+    overlay = state.overlays["track"]
+    assert isinstance(overlay, TrajectoryOverlay)
+    assert overlay.points == ()
+
+
+def test_clear_deleted_overlay_raises_public_error() -> None:
+    create_map_state(tag="deleted-overlay")
+    dpgm.add_marker("vehicle", lat=47.0, lon=2.0, map_tag="deleted-overlay")
+
+    dpgm.delete_overlay("vehicle", map_tag="deleted-overlay")
+
+    with pytest.raises(OverlayNotFoundError):
+        dpgm.delete_overlay("vehicle", map_tag="deleted-overlay")
+
+
+def test_provider_switch_ignores_tiles_that_finish_after_switch() -> None:
+    provider = TileProvider(
+        name="hardening-switch-provider",
+        url_template="https://tiles.example.test/{z}/{x}/{y}.png",
+        min_zoom=0,
+        max_zoom=4,
+    )
+    dpgm.register_provider(provider)
+    try:
+        state = create_map_state(tag="provider-switch-loading", zoom=3)
+        old_tile = TileID("osm", 3, 1, 2)
+        with state.tile_manager._lock:
+            state.tile_manager._loading.add(old_tile)
+
+        dpgm.set_provider("hardening-switch-provider", map_tag="provider-switch-loading")
+        state.tile_manager._result_queue.put(
+            TileResult(
+                old_tile,
+                generation=0,
+                status=TileStatus.READY,
+                width=1,
+                height=1,
+                pixels=(1.0, 1.0, 1.0, 1.0),
+                source="network",
+            )
+        )
+
+        commands = drain_renderer_commands(state)
+        accepted = state.tile_manager.drain_results(
+            generation=state.generation,
+            provider_name=state.provider.name,
+        )
+
+        assert [command.kind for command in commands] == [CommandKind.SET_PROVIDER]
+        assert accepted == []
+        assert state.tile_manager.snapshot().stale_results == 1
+        assert state.tile_manager.get_ready_tile(old_tile) is None
+    finally:
+        dpgm.unregister_provider("hardening-switch-provider")
+
+
+def test_overlay_update_preserves_active_drag_model_state() -> None:
+    create_map_state(tag="update-while-dragging", center=(47.0, 2.0), zoom=9)
+    dpgm.add_marker("vehicle", lat=47.0, lon=2.0, map_tag="update-while-dragging")
+    state = get_map_state("update-while-dragging")
+    state.command_queue.drain()
+    state.dirty = DirtyFlags.NONE
+    state.interaction = InteractionState(active_drag=True, last_mouse_position=(20.0, 30.0))
+
+    dpgm.update_marker("vehicle", lat=47.1, lon=2.1, map_tag="update-while-dragging")
+
+    assert state.interaction.active_drag is True
+    assert state.interaction.last_mouse_position == (20.0, 30.0)
+    assert state.center == (47.0, 2.0)
+    assert state.zoom == 9
+    assert state.dirty == DirtyFlags.OVERLAYS

tests/test_interaction.py

@@ -1,8 +1,21 @@
 from __future__ import annotations
 
-from dpg_map.interaction import calculate_hit_rect
+import pytest
+
+import dpg_map as dpgm
+import dpg_map.interaction as interaction_module
+from dpg_map.commands import CommandKind
+from dpg_map.interaction import (
+    calculate_hit_rect,
+    handle_mouse_down,
+    handle_mouse_drag,
+    handle_mouse_release,
+    handle_mouse_wheel,
+    pan_state_by_pixels,
+    update_drag_from_button_state,
+)
 from dpg_map.sizing import SizeMeasurement, apply_size_measurement
-from dpg_map.state import create_map_state
+from dpg_map.state import DirtyFlags, create_map_state, get_map_state
 
 
 def test_hit_rect_uses_effective_map_size() -> None:
@@ -17,3 +30,118 @@ def test_hit_rect_uses_effective_map_size() -> None:
     assert rect.height == 250
     assert rect.contains(410.0, 270.0)
     assert not rect.contains(411.0, 270.0)
+
+
+def test_pan_updates_center_and_queues_view_command() -> None:
+    state = create_map_state(tag="pan", center=(0.0, 0.0), zoom=3)
+    apply_size_measurement(state, SizeMeasurement(width=400, height=300, visible=True))
+
+    old_center = state.center
+    pan_state_by_pixels(state, 40.0, 0.0)
+
+    assert state.center != old_center
+    assert state.center[1] < old_center[1]
+    assert state.dirty & DirtyFlags.VIEW
+    drained = state.command_queue.drain()
+    assert drained[-1].kind is CommandKind.SET_VIEW
+    assert drained[-1].payload["center"] == state.center
+
+
+def test_mouse_drag_uses_active_drag_state() -> None:
+    state = create_map_state(tag="drag", center=(0.0, 0.0), zoom=3)
+    apply_size_measurement(state, SizeMeasurement(width=400, height=300, visible=True))
+    rect = calculate_hit_rect(state, (10.0, 20.0))
+
+    handle_mouse_down(state, (20.0, 30.0), rect)
+    assert state.interaction.active_drag is True
+    handle_mouse_drag(state, (45.0, 30.0))
+    handle_mouse_release(state)
+
+    assert state.interaction.active_drag is False
+    assert state.interaction.last_mouse_position is None
+    assert state.center[1] < 0.0
+
+
+def test_polled_drag_starts_and_moves_while_button_is_down() -> None:
+    state = create_map_state(tag="polled-drag", center=(0.0, 0.0), zoom=3)
+    apply_size_measurement(state, SizeMeasurement(width=400, height=300, visible=True))
+    rect = calculate_hit_rect(state, (10.0, 20.0))
+
+    update_drag_from_button_state(state, mouse_pos=(20.0, 30.0), hit_rect=rect, is_down=True)
+    update_drag_from_button_state(state, mouse_pos=(45.0, 30.0), hit_rect=rect, is_down=True)
+    update_drag_from_button_state(state, mouse_pos=(45.0, 30.0), hit_rect=rect, is_down=False)
+
+    assert state.interaction.active_drag is False
+    assert state.center[1] < 0.0
+
+
+def test_renderer_poll_does_not_start_drag_for_inactive_map() -> None:
+    state = create_map_state(tag="poll-no-start", center=(0.0, 0.0), zoom=3)
+    apply_size_measurement(state, SizeMeasurement(width=400, height=300, visible=True))
+    rect = calculate_hit_rect(state, (10.0, 20.0))
+
+    update_drag_from_button_state(
+        state,
+        mouse_pos=(20.0, 30.0),
+        hit_rect=rect,
+        is_down=True,
+        can_start=False,
+    )
+
+    assert state.interaction.active_drag is False
+    assert state.center == (0.0, 0.0)
+
+
+def test_drag_owner_prevents_second_map_from_tracking_first_map() -> None:
+    with interaction_module._drag_owner_lock:
+        interaction_module._drag_owner_map = None
+    state_a = create_map_state(tag="drag-owner-a", center=(0.0, 0.0), zoom=3)
+    state_b = create_map_state(tag="drag-owner-b", center=(0.0, 0.0), zoom=3)
+    apply_size_measurement(state_a, SizeMeasurement(width=400, height=300, visible=True))
+    apply_size_measurement(state_b, SizeMeasurement(width=400, height=300, visible=True))
+    rect_a = calculate_hit_rect(state_a, (10.0, 20.0))
+    rect_b = calculate_hit_rect(state_b, (10.0, 20.0))
+
+    handle_mouse_down(state_a, (20.0, 30.0), rect_a)
+    handle_mouse_down(state_b, (20.0, 30.0), rect_b)
+    handle_mouse_drag(state_a, (45.0, 30.0))
+    handle_mouse_drag(state_b, (45.0, 30.0))
+
+    assert state_a.center[1] < 0.0
+    assert state_b.center == (0.0, 0.0)
+    handle_mouse_release(state_a)
+
+
+def test_wheel_zoom_keeps_cursor_latlon_stable() -> None:
+    state = create_map_state(tag="wheel", center=(47.9029, 1.9093), zoom=8)
+    apply_size_measurement(state, SizeMeasurement(width=800, height=600, visible=True))
+    rect = calculate_hit_rect(state, (100.0, 50.0))
+
+    before = dpgm.screen_to_latlon(300.0, 200.0, map_tag="wheel")
+    handle_mouse_wheel(state, mouse_pos=(400.0, 250.0), wheel_delta=1.0, hit_rect=rect)
+    after = dpgm.screen_to_latlon(300.0, 200.0, map_tag="wheel")
+
+    assert state.zoom == 9
+    assert after == pytest.approx(before, abs=1e-7)
+
+
+def test_view_coordinate_helpers_roundtrip() -> None:
+    create_map_state(tag="view-roundtrip", center=(47.9029, 1.9093), zoom=12)
+    state = get_map_state("view-roundtrip")
+    apply_size_measurement(state, SizeMeasurement(width=800, height=600, visible=True))
+
+    screen = dpgm.latlon_to_screen(47.91, 1.92, map_tag="view-roundtrip")
+    latlon = dpgm.screen_to_latlon(*screen, map_tag="view-roundtrip")
+
+    assert latlon == pytest.approx((47.91, 1.92), abs=1e-7)
+
+
+def test_fit_bounds_sets_center_and_zoom() -> None:
+    create_map_state(tag="fit", center=(0.0, 0.0), zoom=2)
+    state = get_map_state("fit")
+    apply_size_measurement(state, SizeMeasurement(width=800, height=600, visible=True))
+
+    dpgm.fit_bounds(((47.8, 1.8), (48.0, 2.0)), map_tag="fit")
+
+    assert dpgm.get_center(map_tag="fit") == pytest.approx((47.9, 1.9))
+    assert dpgm.get_zoom(map_tag="fit") > 2

tests/test_overlays_state.py

@@ -1,8 +1,11 @@
 from __future__ import annotations
 
+from threading import Thread
+
 import pytest
 
 import dpg_map as dpgm
+from dpg_map.commands import CommandKind
 from dpg_map.exceptions import CoordinateError
 from dpg_map.overlays import TrajectoryOverlay
 from dpg_map.state import DirtyFlags, create_map_state, get_map_state
@@ -61,3 +64,50 @@ def test_layer_state_tracks_visibility_and_overlay_membership() -> None:
 
     assert state.layers["fleet"].overlay_tags == set()
     assert "vehicle" not in state.overlays
+
+
+def test_add_layer_can_update_visibility_and_z_index() -> None:
+    create_map_state(tag="layer-order")
+
+    dpgm.add_layer("fleet", z_index=25, show=False, map_tag="layer-order")
+    dpgm.add_layer("fleet", z_index=30, show=True, map_tag="layer-order")
+
+    state = get_map_state("layer-order")
+    assert state.layers["fleet"].show is True
+    assert state.layers["fleet"].z_index == 30
+
+
+def test_threaded_marker_updates_coalesce_without_touching_view_or_drag_state() -> None:
+    create_map_state(tag="threaded-marker", center=(47.0, 2.0), zoom=9)
+    dpgm.add_marker("vehicle", lat=47.0, lon=2.0, map_tag="threaded-marker")
+    state = get_map_state("threaded-marker")
+    state.command_queue.drain()
+    state.dirty = DirtyFlags.NONE
+    state.interaction.active_drag = True
+    state.interaction.last_mouse_position = (100.0, 100.0)
+    before_center = state.center
+    before_zoom = state.zoom
+
+    def update_worker(offset: float) -> None:
+        for index in range(100):
+            dpgm.update_marker(
+                "vehicle",
+                lat=47.0 + offset,
+                lon=2.0 + index * 0.00001,
+                map_tag="threaded-marker",
+            )
+
+    threads = [Thread(target=update_worker, args=(worker * 0.0001,)) for worker in range(4)]
+    for thread in threads:
+        thread.start()
+    for thread in threads:
+        thread.join()
+
+    commands = state.command_queue.drain()
+
+    assert state.center == before_center
+    assert state.zoom == before_zoom
+    assert state.interaction.active_drag is True
+    assert state.interaction.last_mouse_position == (100.0, 100.0)
+    assert state.dirty == DirtyFlags.OVERLAYS
+    assert [command.kind for command in commands] == [CommandKind.UPDATE_OVERLAY]

tests/test_public_api.py

@@ -6,6 +6,7 @@ def test_package_exports_required_public_api() -> None:
 
     expected = {
         "configure",
+        "CacheStats",
         "TileProvider",
         "register_provider",
         "unregister_provider",

tests/test_renderer.py

@@ -1,8 +1,98 @@
 from __future__ import annotations
 
+from typing import Any
+
+import dpg_map as dpgm
+import dpg_map.renderer as renderer_module
 from dpg_map.commands import CommandKind, MapCommand
-from dpg_map.renderer import drain_renderer_commands
+from dpg_map.providers import TileProvider
+from dpg_map.renderer import MapRenderer, drain_renderer_commands
 from dpg_map.state import DirtyFlags, create_map_state
+from dpg_map.tiles import TileID, TileResult, TileStatus, VisibleTile
+
+
+class FakeDpg:
+    def __init__(self) -> None:
+        self.items: set[str | int] = set()
+        self.deleted: list[tuple[str | int, bool]] = []
+        self.drawn: list[tuple[str, str | int]] = []
+        self.images: list[tuple[Any, Any, str | int]] = []
+
+    def does_item_exist(self, tag: str | int) -> bool:
+        return tag in self.items
+
+    def add_draw_layer(self, *, parent: str | int, tag: str | int) -> None:
+        _ = parent
+        self.items.add(tag)
+
+    def delete_item(self, tag: str | int, *, children_only: bool = False) -> None:
+        self.deleted.append((tag, children_only))
+
+    def draw_rectangle(self, *args: Any, parent: str | int, **kwargs: Any) -> None:
+        _ = (args, kwargs)
+        self.drawn.append(("rectangle", parent))
+
+    def draw_image(self, *args: Any, parent: str | int, **kwargs: Any) -> None:
+        _ = (args, kwargs)
+        self.drawn.append(("image", parent))
+        self.images.append((args[1], args[2], parent))
+
+    def draw_text(self, *args: Any, parent: str | int, **kwargs: Any) -> None:
+        _ = (args, kwargs)
+        self.drawn.append(("text", parent))
+
+    def draw_circle(self, *args: Any, parent: str | int, **kwargs: Any) -> None:
+        _ = (args, kwargs)
+        self.drawn.append(("circle", parent))
+
+    def draw_polyline(self, *args: Any, parent: str | int, **kwargs: Any) -> None:
+        _ = (args, kwargs)
+        self.drawn.append(("polyline", parent))
+
+
+class FrameCallbackDpg(FakeDpg):
+    def __init__(self) -> None:
+        super().__init__()
+        self.frame_count = 0
+        self.callbacks: dict[int, Any] = {}
+
+    def get_frame_count(self) -> int:
+        return self.frame_count
+
+    def set_frame_callback(self, frame: int, callback: Any) -> None:
+        self.callbacks[frame] = callback
+
+
+def test_shared_frame_pump_renders_multiple_maps_from_one_frame_callback() -> None:
+    with renderer_module._scheduler_lock:
+        renderer_module._scheduled_renderers.clear()
+        renderer_module._scheduler_frame_scheduled = False
+        renderer_module._scheduler_dpg = None
+
+    state_a = create_map_state(tag="frame-pump-a")
+    state_b = create_map_state(tag="frame-pump-b")
+    fake = FrameCallbackDpg()
+    fake.items.update({state_a.drawlist_tag, state_b.drawlist_tag})
+    renderer_a = MapRenderer(state_a, fake)
+    renderer_b = MapRenderer(state_b, fake)
+    rendered: list[str] = []
+    renderer_a.render_frame = lambda: rendered.append("a")  # type: ignore[method-assign]
+    renderer_b.render_frame = lambda: rendered.append("b")  # type: ignore[method-assign]
+
+    renderer_a.schedule_next_frame()
+    renderer_b.schedule_next_frame()
+    assert list(fake.callbacks) == [1]
+
+    fake.frame_count = 1
+    fake.callbacks[1]()
+
+    assert rendered == ["a", "b"]
+    assert sorted(renderer_module._scheduled_renderers) == ["frame-pump-a", "frame-pump-b"]
+
+    with renderer_module._scheduler_lock:
+        renderer_module._scheduled_renderers.clear()
+        renderer_module._scheduler_frame_scheduled = False
+        renderer_module._scheduler_dpg = None
 
 
 def test_renderer_command_drain_preserves_structural_order_and_coalesces() -> None:
@@ -28,3 +118,138 @@ def test_renderer_command_drain_preserves_structural_order_and_coalesces() -> No
     assert commands[2].payload == {"tag": "a", "v": 2}
     assert state.dirty & DirtyFlags.VIEW
     assert state.dirty & DirtyFlags.OVERLAYS
+
+
+def test_overlay_draw_clears_only_overlay_layer() -> None:
+    state = create_map_state(tag="overlay-draw", center=(47.0, 2.0), zoom=8)
+    dpgm.add_marker(
+        "vehicle",
+        lat=47.0,
+        lon=2.0,
+        show_label=True,
+        label="Vehicle",
+        map_tag="overlay-draw",
+    )
+    fake = FakeDpg()
+    fake.items.add(state.drawlist_tag)
+    renderer = MapRenderer(state, fake)
+
+    renderer._draw_tile_layer(
+        visible_tiles=[], width=400, height=300, attribution="Tiles", tile_size=256
+    )
+    fake.deleted.clear()
+    with state.lock:
+        overlays = tuple(state.overlays.values())
+        layers = {name: (layer.show, layer.z_index) for name, layer in state.layers.items()}
+
+    renderer._draw_overlay_layer(
+        overlays=overlays,
+        layers=layers,
+        center=state.center,
+        zoom=state.zoom,
+        width=400,
+        height=300,
+        tile_size=256,
+    )
+
+    assert fake.deleted == [("overlay-draw##layer-overlays", True)]
+    assert ("circle", "overlay-draw##layer-overlays") in fake.drawn
+    assert ("text", "overlay-draw##layer-overlays") in fake.drawn
+
+
+def test_tile_draw_snaps_fractional_positions_to_integer_pixels() -> None:
+    state = create_map_state(tag="tile-snap", center=(47.0, 2.0), zoom=8)
+    tile_id = TileID("osm", 8, 129, 89)
+    state.tile_manager._result_queue.put(
+        TileResult(
+            tile_id,
+            generation=state.generation,
+            status=TileStatus.READY,
+            width=1,
+            height=1,
+            pixels=(1.0, 1.0, 1.0, 1.0),
+            source="disk",
+        )
+    )
+    state.tile_manager.drain_results(generation=state.generation, provider_name="osm")
+    state.tile_manager.set_texture_tag(tile_id, "tile-texture")
+    fake = FakeDpg()
+    fake.items.add(state.drawlist_tag)
+    renderer = MapRenderer(state, fake)
+
+    renderer._draw_tile_layer(
+        visible_tiles=[VisibleTile(tile_id, 10.4, 20.6)],
+        width=400,
+        height=300,
+        attribution="Tiles",
+        tile_size=256,
+    )
+
+    assert fake.images == [((10, 21), (266, 277), "tile-snap##layer-tiles")]
+
+
+def test_overlay_update_drain_sets_only_overlay_dirty() -> None:
+    state = create_map_state(tag="overlay-dirty")
+    state.dirty = DirtyFlags.NONE
+    state.command_queue.put(MapCommand(CommandKind.UPDATE_OVERLAY, state.tag, {"tag": "a"}))
+
+    drain_renderer_commands(state)
+
+    assert state.dirty == DirtyFlags.OVERLAYS
+
+
+def test_provider_switch_keeps_overlays_and_invalidates_tiles() -> None:
+    provider = TileProvider(
+        name="renderer-switch-provider",
+        url_template="https://tiles.example.test/{z}/{x}/{y}.png",
+        min_zoom=3,
+        max_zoom=4,
+        attribution="Example",
+    )
+    dpgm.register_provider(provider)
+    try:
+        state = create_map_state(tag="provider-switch", center=(47.0, 2.0), zoom=8)
+        dpgm.add_marker("vehicle", lat=47.0, lon=2.0, map_tag="provider-switch")
+        state.command_queue.drain()
+        state.dirty = DirtyFlags.NONE
+        tile_id = TileID("osm", 3, 1, 2)
+        state.tile_manager._result_queue.put(
+            TileResult(
+                tile_id,
+                generation=state.generation,
+                status=TileStatus.READY,
+                width=1,
+                height=1,
+                pixels=(1.0, 1.0, 1.0, 1.0),
+                source="disk",
+            )
+        )
+        state.tile_manager.drain_results(generation=state.generation, provider_name="osm")
+        state.tile_manager.set_texture_tag(tile_id, "old-texture")
+
+        dpgm.set_provider("renderer-switch-provider", map_tag="provider-switch")
+        drain_renderer_commands(state)
+
+        assert "vehicle" in state.overlays
+        assert state.center == (47.0, 2.0)
+        assert state.zoom == 4
+        assert state.generation == 1
+        assert state.provider.name == "renderer-switch-provider"
+        assert state.dirty & DirtyFlags.PROVIDER
+        assert state.dirty & DirtyFlags.TILES
+        assert state.dirty & DirtyFlags.OVERLAYS
+        assert state.tile_manager.get_ready_tile(tile_id) is None
+        assert state.tile_manager.take_texture_deletions() == ["old-texture"]
+    finally:
+        dpgm.unregister_provider("renderer-switch-provider")
+
+
+def test_map_scoped_clear_disk_cache_command_keeps_dearpygui_out_of_caller_thread() -> None:
+    state = create_map_state(tag="clear-disk-command")
+    state.dirty = DirtyFlags.NONE
+
+    dpgm.clear_disk_cache(map_tag="clear-disk-command")
+
+    commands = state.command_queue.drain()
+    assert [command.kind for command in commands] == [CommandKind.CLEAR_DISK_CACHE]
+    assert state.dirty == DirtyFlags.TILES

uv.lock

@@ -74,7 +74,7 @@ wheels = [
 
 [[package]]
 name = "dpg-map"
-version = "0.1.0"
+version = "1.0.0"
 source = { editable = "." }
 dependencies = [
     { name = "dearpygui" },