To define the visibility of the edges, you can apply a Edit Mesh modifier to the object, change to the edge sub-object level and use the Surface Properties tools.
要定义边缘的可见性，您能运用编辑滤网修饰词于对象，变成边缘次级对象水平并且使用表面物产工具。
2
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。
3
In particular, when we design a complicated data sources report, developing a complicated report often needs to edit code or buildup sub-report.