step 8: harden docs and prepare rebuilt beta

AGENTS.md

@@ -2,7 +2,7 @@
 
 ## Current status
 
-Step 6 complete.
+Step 8 complete.
 
 ## Completed steps
 
@@ -12,10 +12,12 @@ 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
 
-Step 7 - Layers, provider switching, and clearing APIs.
+Internal rebuilt beta prepared.
 
 ## Design decisions
 
@@ -94,7 +96,34 @@ None yet.
 - 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
 
-Implement Step 7.
+Commit and tag `v0.3.0b1`.

README.md

@@ -1,53 +1,176 @@
 # dpg-map
 
-`dpg-map` is a Dear PyGui map widget package under rebuild.
+`dpg-map` is a Dear PyGui map widget for XYZ raster tiles and geographic overlays.
 
-The Step 6 overlay rendering layer is in place:
+The rebuilt beta exposes a stable public import:
 
 ```python
 import dpg_map as dpgm
+```
 
+## Install
+
+Use `uv` for development and dependency management:
+
+```bash
+uv sync
+uv run pytest
+```
+
+From another local project, add this package as an editable dependency:
+
+```bash
+uv add --editable ../dpg-map
+uv run python -c "import dpg_map as dpgm; print(dpgm.list_providers())"
+```
+
+## Basic Map
+
+```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=1000, height=700)
+
+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()
+```
+
+## Sizing
+
+The widget is a Dear PyGui `child_window` containing a measured drawlist. The child keeps the requested Dear PyGui sizing intent while the drawlist uses concrete measured pixels.
+
+Supported sizing modes:
+
+- `width=0` and `height=0` keep Dear PyGui default sizing.
+- `width=-1` and `height=-1` fill available space where Dear PyGui supports it.
+- Positive dimensions request fixed sizes.
+- `autosize_x` and `autosize_y` are passed to the child window.
+- 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
+```
+
+## Live Updates
+
+Runtime overlay updates are safe to call from background threads. They update logical state and enqueue renderer commands; Dear PyGui drawing, texture, handler, and viewport calls stay on the GUI thread.
+
+Live marker update:
+
+```python
+dpgm.add_marker("vehicle", lat=47.9029, lon=1.9093, map_tag="map")
+dpgm.update_marker("vehicle", lat=current_lat, lon=current_lon, map_tag="map")
+```
+
+Live trajectory update:
+
+```python
+dpgm.add_trajectory("track", points=[], map_tag="map")
+dpgm.update_trajectory("track", points=tuple(points), map_tag="map")
+```
+
+Stress examples:
+
+```bash
+uv run python examples/markers_live_thread.py
+uv run python examples/trajectory_live_thread.py
+```
+
+## Providers
+
+OpenStreetMap is registered as `osm` by default. Custom XYZ providers can be registered and selected at runtime:
+
+```python
 provider = dpgm.TileProvider(
     name="custom",
     url_template="https://example.com/{z}/{x}/{y}.png",
     attribution="Tiles (c) Example",
 )
 dpgm.register_provider(provider)
-
+dpgm.set_provider("custom", map_tag="map")
-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:
+Provider switching preserves overlays and center, clamps zoom to the new provider range, increments the tile generation, and ignores stale tile results from the previous provider.
 
-- public package exports
+Example:
-- 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
-- asynchronous tile workers that read disk cache, fetch HTTP, and decode images
-- memory cache with visible-tile protection and GUI-thread texture deletion
-- measured-rectangle mouse interaction for left-drag panning and wheel zooming
-- programmatic view commands and screen/latitude-longitude conversion helpers
-- marker, polyline, and trajectory rendering on a draw layer separate from tiles
-- background-thread overlay updates that coalesce without resetting center or zoom
 
-Examples:
+```bash
+uv run python examples/custom_provider.py
+```
+
+## Cache
+
+Tiles use an in-memory cache and a persistent provider-namespaced disk cache.
+
+```python
+dpgm.configure(
+    user_agent="my-app/0.1 contact@example.com",
+    cache_dir=".tile-cache",
+    memory_cache_max_tiles=512,
+    disk_cache_max_bytes=2_000_000_000,
+)
+
+stats = dpgm.get_cache_stats(map_tag="map")
+dpgm.clear_memory_cache(map_tag="map")
+dpgm.clear_disk_cache(provider="osm")
+```
+
+`disk_cache_max_bytes=None` disables the disk size limit. Memory cache clears are routed through the renderer command queue so texture deletion happens on the GUI thread. Disk cache clears can target all providers or a single provider namespace.
+
+Cache example:
+
+```bash
+uv run python examples/cache_stress.py
+```
+
+## OpenStreetMap Usage
+
+The default OpenStreetMap provider requires attribution and should use an application-specific `User-Agent`.
+
+```python
+dpgm.configure(user_agent="my-product/1.0 contact@example.com")
+```
+
+If no user agent is configured, `dpg-map` emits a runtime warning and falls back to a package user agent. Applications are responsible for displaying provider attribution in accordance with provider terms; the renderer draws the provider attribution text on the map.
+
+## Thread-Safety Contract
+
+Public runtime functions are intended to be callable from non-GUI threads unless explicitly documented otherwise. They acquire map locks briefly, update logical state, and/or enqueue commands.
+
+Thread-safe runtime areas include:
+
+- 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/cache updates: `set_provider`, `clear_memory_cache`, `clear_disk_cache`
+
+`map_widget(...)` creates Dear PyGui items and must be used on the GUI thread inside an active Dear PyGui context.
+
+## Examples
 
 ```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
+uv run python examples/custom_provider.py
 uv run python examples/markers_live_thread.py
 uv run python examples/trajectory_live_thread.py
 ```

examples/cache_stress.py

@@ -21,17 +21,39 @@ 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")
-        dpgm.add_marker("start", lat=47.9029, lon=1.9093, label="Orleans")
 
     dpg.setup_dearpygui()
     dpg.show_viewport()

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()

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "dpg-map"
-version = "0.1.0"
+version = "0.3.0b1"
-description = "Add your description here"
+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" }

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

@@ -10,7 +10,12 @@ 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
@@ -22,6 +27,7 @@ from .state import (
     find_map_for_overlay,
     get_config,
     get_map_state,
+    list_map_states,
     mark_dirty,
 )
 from .types import Bounds, LatLon, Point, Tag
@@ -90,6 +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,
@@ -104,20 +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
@@ -129,6 +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] = {}
@@ -145,6 +163,8 @@ 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])
@@ -171,11 +191,15 @@ def fit_bounds(bounds: Bounds, *, map_tag: Tag | None = None) -> None:
 
 
 def screen_to_latlon(x: float, y: float, *, map_tag: Tag | None = None) -> LatLon:
+    """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:
+    """Convert latitude/longitude to map-local screen coordinates."""
+
     lat_value, lon_value = _validate_latlon(lat, lon)
     state = get_map_state(map_tag)
     return latlon_to_screen_in_state(state, lat_value, lon_value)
@@ -192,6 +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))
@@ -231,6 +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:
@@ -264,6 +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")
@@ -303,6 +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)
@@ -335,6 +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)
@@ -362,6 +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)
@@ -386,10 +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)
 
 
@@ -399,10 +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)
@@ -415,6 +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)
@@ -427,16 +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
@@ -445,6 +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
@@ -453,6 +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)
@@ -464,6 +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()
@@ -475,36 +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.min_zoom = provider_obj.min_zoom
-        state.max_zoom = min(state.max_zoom, provider_obj.max_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."""
-    with state.lock:
+
-        mark_dirty(state, DirtyFlags.TILES)
+    for state in _cache_target_states(map_tag):
-        _queue(state, CommandKind.CLEAR_MEMORY_CACHE, {})
+        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
@@ -531,6 +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 {

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:
+def disk_cache_size_bytes(
-    """Return total bytes for cached tile files."""
+    cache_dir: str | Path | None,
+    *,
+    provider: str | None = None,
+) -> int:
+    """Return total bytes for cached tile files, optionally scoped to one provider."""
 
-    return sum(entry.metadata.size_bytes for entry in scan_disk_cache(cache_dir))
+    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:
+def clear_disk_cache_path(cache_dir: str | Path | None, *, provider: str | None = None) -> None:
-    """Remove all persistent tile cache files under a cache root."""
+    """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/renderer.py

@@ -415,7 +415,7 @@ 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,
@@ -432,7 +432,10 @@ 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
 

src/dpg_map/state.py

@@ -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/0.3.0b1"
         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:
+    def clear_disk_cache(
-        """Clear the persistent cache root."""
+        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."""

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_overlays_state.py

@@ -66,6 +66,17 @@ def test_layer_state_tracks_visibility_and_overlay_membership() -> None:
     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")

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

@@ -4,8 +4,10 @@ from typing import Any
 
 import dpg_map as dpgm
 from dpg_map.commands import CommandKind, MapCommand
+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
 
 
 class FakeDpg:
@@ -115,3 +117,60 @@ def test_overlay_update_drain_sets_only_overlay_dirty() -> None:
     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 = "0.3.0b1"
 source = { editable = "." }
 dependencies = [
     { name = "dearpygui" },