docs: function Rectangle(x, y, width, height) {
  		this.setValues(x, y, width, height);
  
  
  	// public properties:
  		// assigned in the setValues method.
  		/**
  		 * X position.
  		 * @property x
  		 * @type Number
  		 **/
  
  		/**
  		 * Y position.
  		 * @property y
  		 * @type Number
  		 **/
  
  		/**
  		 * Width.
  		 * @property width
  		 * @type Number
  		 **/
  
  		/**
  		 * Height.
  		 * @property height
  		 * @type Number
  		 **/
  	}