Use the factory model to create graphic element, then realize the function of property editing, operation just as rotation.
利用工厂模式实现图元创建机制，给出了图元属性编辑、旋转操作等功能具体设计。
Use the factory model to create graphic element, then realize the function of property editing, operation just as rotation.
利用工厂模式实现图元创建机制，给出了图元属性编辑、旋转操作等功能具体设计。
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