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如何找到由贝塞尔三次段形成的闭合曲线的方向(cw 或 ccw)?
它与控制多边形的方向相同。请参阅如何确定多边形点列表是否按顺时针顺序排列?和http://www.cgafaq.info/wiki/Simple%5FPolygon%5FOOrientation