step 2: add thread safe state commands and cache model

tests/test_overlays_state.py

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+from __future__ import annotations
+
+import pytest
+
+import dpg_map as dpgm
+from dpg_map.exceptions import CoordinateError
+from dpg_map.overlays import TrajectoryOverlay
+from dpg_map.state import DirtyFlags, create_map_state, get_map_state
+
+
+def test_overlay_update_does_not_alter_center_or_zoom() -> None:
+    create_map_state(tag="overlay-isolation", center=(47.0, 2.0), zoom=8)
+    dpgm.add_marker("vehicle", lat=47.1, lon=2.1, map_tag="overlay-isolation")
+
+    before_center = dpgm.get_center(map_tag="overlay-isolation")
+    before_zoom = dpgm.get_zoom(map_tag="overlay-isolation")
+
+    dpgm.update_marker("vehicle", lat=47.2, lon=2.2, map_tag="overlay-isolation")
+
+    assert dpgm.get_center(map_tag="overlay-isolation") == before_center
+    assert dpgm.get_zoom(map_tag="overlay-isolation") == before_zoom
+    state = get_map_state("overlay-isolation")
+    assert state.dirty & DirtyFlags.OVERLAYS
+
+
+def test_trajectory_inputs_are_copied() -> None:
+    create_map_state(tag="trajectory-copy")
+    lats = [1.0, 2.0]
+    lons = [3.0, 4.0]
+
+    dpgm.add_trajectory("track", lats=lats, lons=lons, map_tag="trajectory-copy")
+    lats[0] = 99.0
+    lons[0] = 99.0
+
+    state = get_map_state("trajectory-copy")
+    overlay = state.overlays["track"]
+
+    assert isinstance(overlay, TrajectoryOverlay)
+    assert overlay.points == ((1.0, 3.0), (2.0, 4.0))
+
+
+def test_mismatched_lat_lon_lengths_raise() -> None:
+    create_map_state(tag="bad-coordinates")
+
+    with pytest.raises(CoordinateError):
+        dpgm.add_trajectory("track", lats=[1.0], lons=[2.0, 3.0], map_tag="bad-coordinates")
+
+
+def test_layer_state_tracks_visibility_and_overlay_membership() -> None:
+    create_map_state(tag="layers")
+
+    dpgm.add_layer("fleet", map_tag="layers")
+    dpgm.add_marker("vehicle", lat=1.0, lon=2.0, layer="fleet", map_tag="layers")
+    dpgm.hide_layer("fleet", map_tag="layers")
+
+    state = get_map_state("layers")
+    assert state.layers["fleet"].show is False
+    assert state.layers["fleet"].overlay_tags == {"vehicle"}
+
+    dpgm.clear_layer("fleet", map_tag="layers")
+
+    assert state.layers["fleet"].overlay_tags == set()
+    assert "vehicle" not in state.overlays