Known to the center of the rectangle (X, Y), 20, 10, Angle 0: X direction set offset value is 50, offset of the center of the rectangular box X set arbitrary number (such as 10 times); Y direction setting value is 60, cheap Y offset center set arbitrary number (15); Need every time after the migration of X, Y, and finally form the effect like this; , the currently used methods are not ideal, if can can form the actual effect of code is best,