tools.js

// http://stackoverflow.com/questions/5560248/programmatically-lighten-or-darken-a-hex-color-or-rgb-and-blend-colors
// Thanks, Pimp Trizkit :o

function shadeBlend(p,c0,c1) {
    var n=p<0?p*-1:p,u=Math.round,w=parseInt;
    if(c0.length>7){
        var f=c0.split(","),t=(c1?c1:p<0?"rgb(0,0,0)":"rgb(255,255,255)").split(","),R=w(f[0].slice(4)),G=w(f[1]),B=w(f[2]);
        return "rgb("+(u((w(t[0].slice(4))-R)*n)+R)+","+(u((w(t[1])-G)*n)+G)+","+(u((w(t[2])-B)*n)+B)+")"
    }else{
        var f=w(c0.slice(1),16),t=w((c1?c1:p<0?"#000000":"#FFFFFF").slice(1),16),R1=f>>16,G1=f>>8&0x00FF,B1=f&0x0000FF;
        return "#"+(0x1000000+(u(((t>>16)-R1)*n)+R1)*0x10000+(u(((t>>8&0x00FF)-G1)*n)+G1)*0x100+(u(((t&0x0000FF)-B1)*n)+B1)).toString(16).slice(1)
    }
}

// http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
// Kudos to Tim Down!

function hexToRgb(hex) {
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return result ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16)
    } : null;
}