cdf/src/old/color.js

A library for creating oldschool demo-like animations with JavaScript

(function(global,cdf_varname){var lib = global[cdf_varname] || {};

  var Color = lib.Color = lib.color = function(r,g,b,a){
    if(this instanceof Color) {
      if (arguments.length >= 3) this.rgba(r, g, b, a);
      else this.rgba(0, 0, 0, 1);
    } else {
      return Color.rgba.apply(this,arguments);
    }
  };

  Color.rgba = function (r, g, b, a) {
    return new Color(r,g,b,a);
  };

  Color.arr = function(arr){
    return Color.rgba.apply(this,arr);
  };

  Color.prototype = {
    toHex: function(){
      return '#'+[this.r,this.g,this.b,this.a].map(function(c){return c.toString(16)}).join('');
    },
    rgba:function(r,g,b,a){
      this.a=a||1;
      this.r=r;
      this.g=g;
      this.b=b;
      return this;
    },
    rgba2:function(r,g,b,a){
      return this.rgba(r/255,g/255,b/255,a);
    },
    toCss: function () {
      if(this.a===1){
        return 'rgb('
      }
      return 'rgba('+Math.round(this.r*255)+','+Math.round(this.g*255)+','+Math.round(this.b*255)+','+a+')';
    },
    add:function(f){
      var b=this;
      return new Color(
        (f.r * f.a) + (b.r * (1 - f.a)),
        (f.g * f.a) + (b.g * (1 - f.a)),
        (f.b * f.a) + (b.b * (1 - f.a)),
        1
      );
    }
  };

if(cdf_varname) global[cdf_varname]=lib;})(window, (typeof module!=='undefined'&& module.exports)?false:'cdf');