VC++5.0平台上供配电CAD绘图系统的设计与实现_医网打尽文献搜索 关键词：CAD;图形对象;图形接口;层次结构;数据流 [gap=599]Keywords：CAD;draw-object;draw-interface;hiberarchy;data-flow
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You can rotate your square by defining how you draw your object.
您可以通过定义对象的绘制方式来旋转您的正方形。
To draw an object calling itself, you draw a message as you would normally, but instead of connecting it to another object, you connect the message back to the object itself.
为了要画一个调用本身的对象，如你平时所作的，画一条消息，但是不是连接它到另外的一个对象，而是你把消息连接回对象本身。
They begin, in other words, with the object in question and then draw conclusions from it.
换句话说，他们从有问题的物体入手，然后从它得出结论。
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