WireframeSketcher has all the usual editor functionality such as copy&paste and an infinite undo-redo.

WireframeSketcher具有所有的习惯操作方法例如复制、粘贴以及无穷的撤销重做。

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The command design pattern which provides undo-redo operation, is applied to the whole class frame design and several sub-classes design of graphics edit operation.

命令模式的使用包含整个类框架设计和几套图形编辑操作子类设计，支持可以撤销重做的操作。

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During the course of editing, undo, and redo, the model is the only thing that endures.

在编辑、撤销和重做的过程中，模型是唯一保持不变的。

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