增加radiusInMeters参数，传入了radiusInMeters每次绘制都把 500 米换算成当前缩放下的像素半径，这样就不会随着地图缩放热力结果不一样；增加返回上图渲染的结果，复用热力图渲染前已经计算出来的屏幕格网数据，找出高热力格子组成的聚集区，再把聚集区的加权中心从屏幕坐标反算回地图经纬度 #60

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