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在分析线路平面交互设计方式的基础上，采用面向对象的方法，使用ＯｂｊｅｃｔＡＲＸ的定制实体机制，构造了线路平面Ｒａｉｌｗ ａｙＬｉｎｅ 实体。通过巧妙地设计实体的夹点，定义夹点的拖放功能，实现了在ＡｕｔｏＣＡＤ内交互式设计线路平面的诸多功能，并使得线路平面的交互设计操作简化到无需选择任何命令，只要选中实体，拖放鼠标即可实现所有功能
Based on the analysis of the interaction design of line plane, an object-oriented approach was used to construct the line plane Railw ayLine entity by using ObjectARX’s customized entity mechanism. By cleverly designing the pinch point of the entity and defining the drag and drop function of the pinch point, many functions of interactively designing the line plane in AutoCAD are realized and the interactive design operation of the line plane is simplified to no need to select any command. As long as the entity is selected, Drag and drop the mouse to achieve all the features