If two points are selected, the curve between both points will be converted. If you select more than two points, each time you click this icon, a different portion of the curve will be converted. If necessary, round points are converted into corner points and corner points are converted into round points.
如果仅选择了一个点，将转换这个点前面的曲线；如果选择了两个点，将转换两点之间的曲线；如果选择了两个以上的点，则每单击一次该图标就会转换曲线的一个部分。需要时还可以将圆滑的接点转换为角点，或者将角点转换为圆滑的接点。