fix(studio): 统一 Box/Mini 箭头网格与强度着色

shared/tests/test_image_backend.py

@@ -1080,3 +1080,22 @@ def test_a_box_result_on_the_sdk_grid_matches_the_live_painter():
     )
     assert np.array_equal(np.asarray(drawn), np.asarray(live))
     assert _painted(drawn) > 0
+
+
+@pytest.mark.parametrize("draw_style", ["box", "mini"])
+def test_box_family_keeps_sparse_idle_dots_and_distinct_motion_colours(draw_style):
+    from orisys_app_shared.acquisition.arrows import FLOW_IDLE_HEX, hex_to_bgr, sdk_box_policy
+
+    policy = sdk_box_policy()
+    base = np.zeros((100, 120, 3), np.uint8)
+    flow = np.zeros((100, 120, 2), np.float32)
+    flow[50, 50, 0] = 1.25  # 2.5 px displacement, just over the box floor.
+    flow[50, 90, 0] = 3.0  # 6 px displacement on the same frame.
+    drawn = draw_arrow_display(
+        base, flow, draw_style=draw_style, policy=policy,
+        colormap=flow_colormap("dark"),
+    )
+    tint = np.array(hex_to_bgr(FLOW_IDLE_HEX), np.uint8)
+    assert _marker_is_there(drawn, 30, 30, tint)
+    assert not _marker_is_there(drawn, 50, 50, tint)
+    assert not np.array_equal(drawn[50, 50], drawn[50, 90])