Math.normalize

// Math normalize - By Beau Vandenburgh (MIT Licensed)
Math.normalize = function(value, min, max) { //converts range from min - max to 0 - 1
*    return (value - min) / (max - min)
}

Math.map = function(value, minin, maxin, minout, maxout) { //convers value from range minin,maxin to range minout,maxout
    return Math.denormalize(Math.normalize(value, minin, maxin), minout, maxout);
}

Math.denormalize = function(value, start, stop) { //converts range from 0 - 1 to start - stop
    return value * (stop - start) + start;
}