开始设计一个简单的图形库：要这样做，您需要利用NewUMLProject向导(图1)在新的UML工程中创建空的模型。

Start by designing a simple graphics library: To do this, create an empty model in a new UML project by using by the new UML project wizard (Figure 1).

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文后举了四个例子，其中三个是现在文献中常用的考题，还有一个是某结构工程的实例-91米直径的空问网架屋盖。

Four examples are illustrated, three of them are usually used in references, the rest one is a practical engineering structure, a spatial network of roof with diameter in 91m.

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现在，建立一个空的Python工程。

Now, create a new empty Python project.

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现在，建立一个空的Python工程。

Now, create a new empty Python project.

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