One road model is built for road boundary, and a optimal fitting with multiple line segment is proposed.
对于道路边界表示问题，建立了一种道路模型，并提出了一种基于最优分段线段的道路边界拟合算法。
Draws multiple series of connected line segment s. the current position is neither used nor updated by this function.
画多组相连线段。这个函数不使用也不更新当前位置。
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