Offset Curve

基本解释

The key for scanning-path scheme is the generation of offset curve of polygon contour in plane.
扫描策略的关键技术是生成平面内多边形轮廓的偏置曲线。
On the basis of this, the initial boundary curve is faired by use of B-spline fitting technology and the offset curve of the initial border curve is constructed.
然后又通过B样条曲线拟合技术对初始边界曲线进行了光顺，并求出光顺后边界线的切矢及法线方向，进而构造出边界曲线的等距线。
The algorithm proposed by us for polygonal chains intersection based on the sweep line algorithm is extended, and it is used to detect and delete global self-intersections in the rough offset curve.
拓展了我们已有的平面上单调链求交的扫描线算法，将其应用到初步等距线中的全局自交点和全局无效环的确定上。