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。
The matrix multiplication is done in the order SRT, where s, r, and t are the matrices for scale, rotate, and translate, respectively.
矩阵是按照SRT顺序进行相乘的，其中S、r和t分别表示缩放、旋转和平移的矩阵。
Describes how to rotate a color using a color matrix.
描述如何使用颜色矩阵旋转颜色。
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