postRotate(float angle, float ax, float ay, float az)：按给定角度绕穿过（0, 0, 0）和（ax, ay, az）的轴旋转对象。

Transform.postRotate(float angle, float ax, float ay, float az): Rotates the object with the given angle around the axis that goes through (0, 0, 0) and (ax, ay, az).

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您可以通过定义对象的绘制方式来旋转您的正方形。

You can rotate your square by defining how you draw your object.

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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.

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