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.
第5章主要介绍了展开实体创建模块，基于三角形等面积法将三角形网格结点映射到平面上，用样条曲线将周边结点连接起来，得到展开视图。
The mapping problem of triangular crunodes is resolved based on the same area in the Chapter 5. The developing view can be gained when the boundary crunodes are connected by the Spline.
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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