你用它来画直线。
那个国王为什么画直线啊？
在按钮的控制下，通过鼠标拖动来画直线和圆，轻松自如。
Under the control of the button, through the mouse to draw a line and round, easily.
设想6个人是6个点，每2点画成的一条直线表示朋友。
Imagine the six people as points and let an edge between points indicate friendship.
设想6个人是6个点，每2点画成的一条直线表示朋友。
Imagine the six people as points and let an edge between points indicate friendship.
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