For example, the code in Listing 1 draws a square using the rect function, then specifies a change to the coordinate system using translate.

例如，清单1所示代码使用rect函数绘制了一个正方形，然后使用translate修改坐标系统。

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Then, you create a new coordinate system that's centered within your display using translate and store this matrix.

然后，您可以使用 translate 创建一个位于显示器中央的新坐标系统。

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Next, rotate and store this matrix; then, offset from the current coordinate system with translate (which is applied from the previously rotated and translated matrices), and draw a red ellipse.

接下来，旋转和恢复这个矩阵；然后，使用translate设置与当前坐标系统的偏移量(这是从之前旋转和转换的矩阵应用的)，并绘制一个红色椭圆。

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