If the shape is irregular, the shadow should follow its outline.
如果形状是不规则的，阴影应该沿着轮廓走。
With this method, shape points were calculated by surface outline equation got from quadratic surface.
该方法通过二次曲面求管线表面轮廓方程进而求得管线的型值点集。
Adds the outline of a pie shape to this path.
向此路径添加一个扇形轮廓。
Adds the outline of a pie shape to this path.
向此路径添加一个扇形轮廓。
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