加深对常用的二维几何变换的了解，如平移，旋转，放大缩小等，掌握变换顺序和变换矩阵的用法。-better used to transform the two-dimensional geometry of understanding, such as translation, rotation, zooming, and the master sequence transform matrix of usage.

实现图像的几何变换，包括旋转、缩放和平移等功能-Image of the geometric transformation, including rotation, zooming and panning functions