occ sample geometry 分析初探1

OCC_BaseDoc.h

是虚类继承CDocument

析构函数是纯虚函数，需要子类实现，可以避免使用OCC 忘记释放资源从而造成内存泄漏。

Class hierarchy

OCC_3dBaseDoc 中包含两个成员变量和对应的鼠标，快捷菜单事件。

同样对于view hierarchy

相应对于view 是由对应的view处理函数和相应的 Rotation Pan Scaling

Session class is derived from AIS_InteractiveObject

The class is use by the display function

This display function take the aDoc(ais_context)as argument

So we have to give the visualization athrough restudy .

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//note:

* you do1t have permission to upload pictures because you registered for less than a week

so i will update later