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为使自动生成的故障树图满足树图美学标准的要求,基于一般树形结构原则与树图美学定律原则,开发一种自动生成故障树绘制布局的算法。采用初始坐标、修改坐标和最终坐标表征树节点的位置关系,通过初始坐标完成兄弟节点间的相对布局,通过后序遍历形成的修改坐标完成节点之间的重叠规避。结果表明:绘制出的故障树图有视觉效果良好、空间利用率高以及能够满足友好的用户交互需求等优点,为故障树进行风险评价与可靠性分析提供有效的图形可视化与数据交互解决方案。
In order to make the automatically generated fault tree map meet the requirements of the aesthetics of tree map, an algorithm of automatically generating the fault tree rendering layout is developed based on the principle of general tree structure and the principle of tree diagram aesthetics. The initial coordinates, the modified coordinates and the final coordinates are used to characterize the location of tree nodes. The relative coordinates of sibling nodes are achieved through the initial coordinates, and the overlapped avoidance of nodes is achieved by modified coordinates formed by post-traversal. The results show that the proposed fault tree has the advantages of good visual effect, high space utilization and friendly user interaction. It provides an effective graphic visualization and data exchange solution for risk assessment and reliability analysis of fault tree.