li_height = unitstopixels(parent.height, yunitstopixels!)
lws_pointapi[1].xpos = li_xpos
lws_pointapi[1].ypos = li_ypos + li_height / 2
lws_pointapi[2].xpos = li_xpos + li_width / 2
lws_pointapi[2].ypos = li_ypos
lws_pointapi[3].xpos = li_xpos + li_width
lws_pointapi[3].ypos = li_ypos + li_height / 2
lws_pointapi[4].xpos = li_xpos + li_width / 2
lws_pointapi[4].ypos = li_ypos + li_height
ll_handle = createpolygonrgn(lws_pointapi[], 4, 1)
//其中第 1 个参数为多边形各个顶点坐标值的数组
//其中第 2 个参数为多边形边数，可修改，配合数组值
//其中第 3 个参数为填充模式 alternate /winding
setwindowrgn(handle(parent), ll_handle, true)
return 1
end event
type cb_2 from commandbutton within w_button
