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Labeling graphical features of drawings

机译:标注工程图的图形特征

摘要

A method is provided for automated placement of labels for a given graph layout or map. Even though in practice a label is usually associated with a line (edge), point (node) or area, this method can be extended to produce labeling solution for any graphical feature with explicit geometric representation (in two or three dimensions). This method first finds a labeling solution for a set of graphical features G by eliminating a subset of the set of potential label placements for any member of G, and reducing the labeling problem to a maximum matching problem of a bipartite graph. Next, if there are graphical features in G that have no label placement assigned to them yet, a backtracking algorithm may be used to improve the space available for the labeled graphical features. It may be shown that the labeling problem is NP-hard if any graphical feature in G is a line or point. As a result, the GFLP problem cannot be solved in polynomial time, but requires the application of well-devised heuristics.
机译:提供了一种用于自动放置给定图形布局或地图的标签的方法。即使在实践中,标签通常与线(边),点(节点)或区域相关联,也可以扩展此方法以为具有显式几何表示(二维或三维)的任何图形特征生成标注解决方案。该方法首先通过消除G的任何成员的一组潜在标签放置的子集,并将标签问题减少到二部图的最大匹配问题,从而找到一组图形特征G的标签解决方案。接下来,如果G中的图形特征尚未分配标签位置,则可以使用回溯算法来改善可用于标记的图形特征的空间。可以证明,如果G中的任何图形特征是线或点,则标注问题都是NP问题。结果,GFLP问题无法在多项式时间内解决,而是需要应用精心设计的启发式方法。

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