说明：  画多边形，梯形，对话框输入宽高宽画四边形，输入上宽下宽高画梯形，可倒四边圆角量，也有多边形选择，输入边数，如5边，然后输入边长画出多边形
(Draw a polygon, trapezoidal, wide width of the dialog box enter the picture input quadrilateral, width width and height can be inverted trapezoid drawing, four have rounded, polygon selection, input the number of edges, such as the 5 side, and then the input side draw polygon)