发明授权
- 专利标题: Technique for drawing directed graphs
- 专利标题(中): 绘制有向图的技术
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申请号: US355731申请日: 1989-05-23
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公开(公告)号: US4953106A公开(公告)日: 1990-08-28
- 发明人: Emden R. Gansner , Stephen C. North , Kiem-Phong Vo
- 申请人: Emden R. Gansner , Stephen C. North , Kiem-Phong Vo
- 申请人地址: NJ Murray Hill
- 专利权人: AT&T Bell Laboratories
- 当前专利权人: AT&T Bell Laboratories
- 当前专利权人地址: NJ Murray Hill
- 主分类号: G06T11/20
- IPC分类号: G06T11/20
摘要:
The present invention relates to a computer-implemented technique for drawing directed graphs providing reduced crossings and improved picture quality. An edge list description provided by a user is processed to produce a ranking of all nodes that minimizes the weighted sum of all edges, an edge cost being the product of its weight and length. Nodes within a ranking are then positioned to reduce edge crossings using a heuristic based on node positions in adjacent ranks. Such heuristic uses a generalized median as a weighting function plus node transposition to avoid senseless edge crossings before proceeding to a next rank. Nodes are then positioned to minimize the weighted sum of horizontal distances among connected nodes. Spline control points are then computed for interconnected nodes, and a code sequence for a drawing is generated.
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