并利用改进的垂直平面扫描算法生成由约束图模型定义的约束图。

And the constraint-graph-model-de-fined constraint graph is generated by using improved vertical plane scanning algorithm.

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首次将扫描线算法用于平面和空间等值线图和彩色云图的显示。

And scanning line algorithm is used for the first time in displaying the plane and space isogram and nephogram.

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通过对多边形可见边的分析，利用平面扫描技术，给出了求其可见边的算法。

By analysing of the visibility edges of the polygons, using the plane sweep technique, we present an algorithm to find the visibility edges of the set of polygons.

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