iOS熱點圖：LFHeatMap
LFHeatMap 是一個極快的 iOS 熱點圖。
Features
- 從點/重量數據對快速生成熱圖
- generates UIImage objects that can be overlaid as needed
- variable boost/bleed
Anti-Features
LFHeatMap is a simple UIImage generator. The resulting object can be used like any other UIImage, standalone or in a UIImageView. While it can be overlaid on top of a MKMapView, it is not strongly tied to this specific component and hence does not offer the benefits that come with a more complex implementation of MKOverlayRenderer.
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