9#if MA_INCLUDE_OVERLAY_HEATMAP
18@property (nonatomic, readonly) MAHeatMapVectorOverlay *heatOverlay;
25- (instancetype)initWithHeatOverlay:(MAHeatMapVectorOverlay *)heatOverlay;
32- (MAHeatMapVectorItem *)getHeatMapItem:(CLLocationCoordinate2D )coordinate;
该类是地图覆盖物Renderer的基类, 提供绘制overlay的接口但并无实际的实现(render相关方法只能在重写后的glRender方法中使用)
Definition MAOverlayRenderer.h:20