这样，当我在旋转图形时，直线的中心将发生旋转。
That way, when I rotate the shape, the rotation occurs from the center of the line.
它们还可用于图形工作，如简化gui上对象的旋转。
They can also be used for graphics work, such as simplifying the rotation of objects on a GUI.
计算机图形几乎不会存在。没有自动旋转底盘的图像，没有视觉工程设计，没有用于建筑、厨房、高速公路等的CAD(计算机辅助设计)。
Computer graphics hardly exist. No more pictures of a rotating auto chassis, no visual engineering design, no CAD (computer - aided design) for buildings, kitchens, highways, etc.
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