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