public MapProjection(MapProjectionID id) { _id = id; }
static void HandlePrepareCacheCallback(MapLayerID inlayer, float *inTotalMapBoundsLeftTopRightBottom, MapProjectionID projection, void *inrefcon) { ref readonly RectF bounds = ref Unsafe.AsRef <RectF>((RectF *)inTotalMapBoundsLeftTopRightBottom);