中文摘要：

综述了海量层次信息可视化与Focus＋Context技术的相关工作，针对海量层次信息可视化的交互问题，在嵌套圆可视化技术的基础上提出了基于上下文感知的Focus＋Context交互式可视化技术．首先，基于外切圆排列方法提出对圆心进行三角网格剖分的方法，为变形计算建立上下文；然后，针对变形计算前后上下文一致性问题，在三角网格邻居跟踪方法的基础上，提出了用于同层兄弟节点上下文感知的外切圆变形排列方法，以及用于父子节点上下文感知的嵌套圆迭代排列方法．实验结果表明。上述方法在实现焦点突出的鱼眼视图的同时，能够有效地解决Focus＋Context交互式可视化的上下文感知问题．上述方法应用于文件系统海量层次信息的交互式可视化问题，提供了交互式可视化工具．

英文摘要：

A Focus＋Context technique based on circle packing is presented for interactive visualization of large hierarchical data. First, a triangular mesh generating method based on externally tangent circles packing is proposed to establish context. Then a method for triangular mesh neighbors tracking is introduced. To realize the context consistency for Focus＋Context technique, a layout method for the distorted brother nodes of the focus node is presented based on triangular mesh neighbors tracking, and a recursive method for the children nodes of the focus node is described. Experimental results show that this method can realize fisheye view and can achieve focus and context consistency. The method has been applied to the interactive visualization of file systems, and an interactive visualization tool is introduced.