为做到这一点，需创建一个对象(或代理)来代表设备。

To do this, an object (or surrogate) is created to act on behalf of the device.

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add_edges方法根据一系列的点创建一个edge对象数组。

The add_edges method creates an array of edge objects from a sequence of points.

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这样，我们就有一个单一的联系点用来修改我们所创建对象的核心行为。

Thus, we have a single point of contact for modifying the core behaviour of the Objects we create.

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