一个可以制作任意形状按扭或窗体的控件,可以通过一张图片覆盖到控件本身,通过计算让控件变成相应的形状,很好用的图形图像编成控件,带demo.-A graphic component that can used to create almost all kinds of polygon form or button etc, it can shape the button s apperence as the image covering