The starting point of a figure is the first point in the sequence of connected lines and curves.
图形的起始点是相互连接的一系列直线和曲线中的第一点。
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.
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.
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。
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