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Realizing Undo/Redo in Large-scale CAD Software

LI Xiang1,LI Yun-hua2(1.Institute of Information Technology,Hudong Zhonghua Shipbuilding(Group) Co. Ltd.,Shanghai 200129,China;2.School of Electronic and Information,Nantong University,Nantong 226007,China)  
The paper introduces the method of realizing undo/redo in CAD software development by using command pattern and analyzes in detail the process of its implementation and some problems that need paying attention to.The method has been proved effective in the large-scale CAD software development that the writers are engaged in.
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