code: public Transformation2D copy() {
  		Transformation2D result = new Transformation2D();
  		result.xx = xx;
  		result.xy = xy;
  		result.xd = xd;
  		result.yx = yx;
  		result.yy = yy;
  		result.yd = yd;
  		return result;
  	}
docs: Returns a copy of the Transformation2D object.
  
  @return A copy of this object.