本文介绍了如何使用矩阵运算来旋转位图文件。通过旋转矩阵，每个像素都可以计算出新的坐标位置。此外，还提到了镜像、平移、转置及缩放等操作对应的矩阵计算方法。
Today I learned how to rotate a bitmap file. There is a rotation matrix. Every pixel in a bitmap file
worked out a new coupe co-ordination base on this matrix. This matrix come from normal computing at the
Descartes co-ordination by usin trigonometric functions.
Mirror, translation, transpose, zoom all have their computing matrix respectively.
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