HeatCanvas is a heat map for web browser, written with Canvas and WebWorker. (sunng.info)

There are some redraw issue on panning the map. It seems that GoogleMaps won't redraw unless the panning distance is large enough. I will try to smooth it in future release.

I enhanced Sunng's googlemap page by adding google map event and event listener. Here you can see the live demo. http://nihuajie.com/heatmap/googlemap.html

Since HeatCanvas is pixel based, it costs time to render. However, the calculation and rendering are processed in background, which won't freeze UI. Both calculation and rendering are in O(n) to data input. And the function you choose for v=f(d) also affectes on performance.