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Use portable map anchor coordinates for drag positioning

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liu weikai committed 2026-10-10 12:38:18 +08:00
1 parent 0f721c3969
commit de352c4038
1 file changed
+6 -2
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modules/ui_shared/src/ui/widgets/map/map_viewport.cpp
+6 -2
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@@ -508,6 +508,10 @@ void translate_loaded_tiles(RuntimeImpl& impl, int dx, int dy)
return;
}
const int anchor_pan_x = impl.anchor.gps_tile_screen_x + impl.anchor.gps_offset_x -
lv_obj_get_width(impl.widgets.tile_layer) / 2;
const int anchor_pan_y = impl.anchor.gps_tile_screen_y + impl.anchor.gps_offset_y -
lv_obj_get_height(impl.widgets.tile_layer) / 2;
for (auto& tile : impl.tiles)
{
if (!tile.img_obj || !lv_obj_is_valid(tile.img_obj) || tile.z != impl.model.zoom || tile.map_source != impl.model.map_source)
@@ -519,8 +523,8 @@ void translate_loaded_tiles(RuntimeImpl& impl, int dx, int dy)
continue;
// Objects can have been placed by different asynchronous callbacks.
// Reproject their tile identity instead of accumulating their position.
screen_x += impl.model.pan_x - impl.tile_ctx.previous_pan_x;
screen_y += impl.model.pan_y - impl.tile_ctx.previous_pan_y;
screen_x += impl.model.pan_x - anchor_pan_x;
screen_y += impl.model.pan_y - anchor_pan_y;
lv_obj_set_pos(tile.img_obj, static_cast<lv_coord_t>(screen_x), static_cast<lv_coord_t>(screen_y));
// Prefetched descriptors already own pixels. Reveal them immediately
// when a lightweight drag brings them into view, without new SD I/O.