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HeatGrid - JavaScript library for creating heat maps using HTML5 canvas
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Example usage:

    HeatGrid.draw('grid', data, {
        gradient: HeatGrid.GRADIENT_HEAT,
        rows: 40,
        cols: 35,
        swidth: 10,
        sheight: 10,
    });


CREDITS

HeatGrid was written by Andrew E. Bruno <aeb@qnot.org>

Gradient functionality ported from Java Heat Map written by Matthew Beckler
http://www.mbeckler.org/heatMap/