docs: function Matrix2D(a, b, c, d, tx, ty) {
  		this.setValues(a,b,c,d,tx,ty);
  
  	// public properties:
  		// assigned in the setValues method.
  		/**
  		 * Position (0, 0) in a 3x3 affine transformation matrix.
  		 * @property a
  		 * @type Number
  		 **/
  
  		/**
  		 * Position (0, 1) in a 3x3 affine transformation matrix.
  		 * @property b
  		 * @type Number
  		 **/
  
  		/**
  		 * Position (1, 0) in a 3x3 affine transformation matrix.
  		 * @property c
  		 * @type Number
  		 **/
  
  		/**
  		 * Position (1, 1) in a 3x3 affine transformation matrix.
  		 * @property d
  		 * @type Number
  		 **/
  
  		/**
  		 * Position (2, 0) in a 3x3 affine transformation matrix.
  		 * @property tx
  		 * @type Number
  		 **/
  
  		/**
  		 * Position (2, 1) in a 3x3 affine transformation matrix.
  		 * @property ty
  		 * @type Number
  		 **/
  	}