heatmap.js is an open source JavaScript library that can be used to generate web heatmaps with the html5canvas element based on your data. Heatmap instances contain a store in order to colorize the heatmap based on relative data, which means if you're adding only a single datapoint to the store it will be displayed as the hottest(red) spot, then adding another point with a higher count, it will dynamically recalculate the colors. The library is currently supported in Firefox 3.6+, Chrome 10, Safari 5, Opera 11 and IE 9+.
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