this.draw = function(ctx, scaleFactor)
      {
        var i; 
        
        for(i = 0; i < this.blobs.length; i++)
        {
          if(this.blobs[i] == null)
          {
            continue; 
          }
          this.blobs[i].draw(ctx, scaleFactor); 
        }    
      }
    }