/* Fake a Flog.* namespace */
  if(typeof(Flog) == 'undefined') var Flog = {};
  if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {};
  
  Flog.RayTracer.Color = Class.create();
  
  Flog.RayTracer.Color.prototype = {
      red : 0.0,
      green : 0.0,
      blue : 0.0,
      
      initialize : function(r, g, b) {
          if(!r) r = 0.0;
          if(!g) g = 0.0;
          if(!b) b = 0.0;
          
          this.red = r;
          this.green = g;
          this.blue = b;
      },
      
      add : function(c1, c2){
          var result = new Flog.RayTracer.Color(0,0,0);
          
          result.red = c1.red + c2.red;
          result.green = c1.green + c2.green;
          result.blue = c1.blue + c2.blue; 
          
          return result;
      },
      
      addScalar: function(c1, s){
          var result = new Flog.RayTracer.Color(0,0,0);
          
          result.red = c1.red + s;
          result.green = c1.green + s;
          result.blue = c1.blue + s; 
          
          result.limit();
          
          return result;
      },
      
      subtract: function(c1, c2){
          var result = new Flog.RayTracer.Color(0,0,0);
          
          result.red = c1.red - c2.red;
          result.green = c1.green - c2.green;
          result.blue = c1.blue - c2.blue; 
          
          return result;
      },
      
      multiply : function(c1, c2) {
          var result = new Flog.RayTracer.Color(0,0,0);
          
          result.red = c1.red * c2.red;
          result.green = c1.green * c2.green;
          result.blue = c1.blue * c2.blue; 
          
          return result;
      },
      
      multiplyScalar : function(c1, f) {
          var result = new Flog.RayTracer.Color(0,0,0);
          
          result.red = c1.red * f;
          result.green = c1.green * f;
          result.blue = c1.blue * f; 
          
          return result;
      },
      
      divideFactor : function(c1, f) {
          var result = new Flog.RayTracer.Color(0,0,0);
          
          result.red = c1.red / f;
          result.green = c1.green / f;
          result.blue = c1.blue / f; 
          
          return result;
      },
      
      limit: function(){
          this.red = (this.red > 0.0) ? ( (this.red > 1.0) ? 1.0 : this.red ) : 0.0;
          this.green = (this.green > 0.0) ? ( (this.green > 1.0) ? 1.0 : this.green ) : 0.0;
          this.blue = (this.blue > 0.0) ? ( (this.blue > 1.0) ? 1.0 : this.blue ) : 0.0;
      },
      
      distance : function(color) {
          var d = Math.abs(this.red - color.red) + Math.abs(this.green - color.green) + Math.abs(this.blue - color.blue);
          return d;
      },
  
      blend: function(c1, c2, w){
          var result = new Flog.RayTracer.Color(0,0,0);
          result = Flog.RayTracer.Color.prototype.add(
                      Flog.RayTracer.Color.prototype.multiplyScalar(c1, 1 - w), 
                      Flog.RayTracer.Color.prototype.multiplyScalar(c2, w)
                    );
          return result;
      },
      
      toString : function () {
          var r = Math.floor(this.red*255);
          var g = Math.floor(this.green*255);
          var b = Math.floor(this.blue*255);
          
          return "rgb("+ r +","+ g +","+ b +")";
      }
  }