lightAnimation/utils.js at master · kumamio/lightAnimation · GitHub

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window.utils = {};

window.utils.parseColor = function (color, toNumber) {
  if (toNumber === true) {
    if (typeof color === 'number') {
      return (color | 0); //chop off decimal
    }
    if (typeof color === 'string' && color[0] === '#') {
      color = color.slice(1);
    }
    return window.parseInt(color, 16);
  } else {
    if (typeof color === 'number') {
      color = '#' + ('00000' + (color | 0).toString(16)).substr(-6); //pad
    }
    return color;
  }
};

window.utils.colorToRGB = function (color, alpha) {
  //number in octal format or string prefixed with #
  if (typeof color === 'string' && color[0] === '#') {
    color = window.parseInt(color.slice(1), 16);
  }
  alpha = (alpha === undefined) ? 1 : alpha;
  //parse hex values
  var r = color >> 16 & 0xff,
      g = color >> 8 & 0xff,
      b = color & 0xff,
      a = (alpha < 0) ? 0 : ((alpha > 1) ? 1 : alpha);
  //only use 'rgba' if needed
  if (a === 1) {
    return "rgb("+ r +","+ g +","+ b +")";
  } else {
    return "rgba("+ r +","+ g +","+ b +","+ a +")";
  }
};

window.utils.rgbToHsl = function (r, g, b){

    debugger;
    r /= 255, g /= 255, b /= 255;
    var max = Math.max(r, g, b), min = Math.min(r, g, b);
    var h, s, l = (max + min) / 2;

    if(max == min){
        h = s = 0; // achromatic
    }else{
        var d = max - min;
        s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
        switch(max){
            case r: h = (g - b) / d + (g < b ? 6 : 0); break;
            case g: h = (b - r) / d + 2; break;
            case b: h = (r - g) / d + 4; break;
        }
        h /= 6;
    }
    return [parseInt(h*100), parseInt(s*100), l.toFixed(2) ];


}