折线抵消闭合的多边形和岛屿 [英] Polyline offset with closed polygon and islands

问题描述

予有未分类的组线段没有任何彼此结合。每行描述2点（X，Y）。我可以搜索具有相同的点的线，这意味着它们应当连接

I have unsorted set of line segments without any binding to each other. Each line described with 2 points (x,y). I can search for lines with the same points, which means they should be connected.

每一行的厚度属性。我需要抵消这一厚度每条路径，并创造4点说明最后plygon（每行）。

Every line have a thickness attribute. I need to offset each path by this thickness, and create 4 points describing the final plygon (for each line).

截图1

现在我需要加以改进，以正确处理弯道（连接）。但不知道该怎么做。

now I need to refine it to handle corners (joins) correctly. but have no idea how to do it.

期望的结果：截图2

推荐答案

请参阅<一href="http://www.cgal.org/Manual/3.2/doc%5Fhtml/cgal%5Fmanual/Straight%5Fskeleton%5F2/Chapter%5Fmain.html"相对=nofollow>这里使用它的骨架（这是您想在这里做什么）抵消多边形的一种方法。

See here for one method of offsetting a polygon using it's skeleton (which is what you are trying to do here).

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