构成形状的点类型包括起始点、终结点和贝塞尔曲线点。

Point types that make up shapes include start points, stop points, and bezier curve points.

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如果图形中已有直线或曲线，则添加一段直线连接已有线段的终结点和弧线的起始点。

If there are previous lines or curves in the figure, a line is added to connect the endpoint of the previous segment to the beginning of the arc.

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如果图形中已有直线或曲线，则将添加一段直线连接已有线段的终结点和序列中第一段立方曲线的起始点。

If there are previous lines or curves in the figure, a line is added to connect the endpoint of the previous segment to the starting point of the first cubic curve in the sequence.

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