仿射变换 Affine transformation
（重定向自Affine mapping）
仿射变换，又称仿射映射，是指在几何中，一个矢量空间进行一次线性变换并接上一个平移，变换为另一个矢量空间。
一个对矢量
平移
，与旋转放大缩小
的仿射映射为
上式在齐次坐标上，等价于下面的式子
在分形的研究里，收缩平移放射映射可以制造制具有自相似性的分形。
Affine mapping
中文百科
英语百科
Affine transformation 仿射变换
（重定向自Affine mapping）
In geometry, an affine transformation, affine map or an affinity (from the Latin, affinis, "connected with") is a function between affine spaces which preserves points, straight lines and planes. Also, sets of parallel lines remain parallel after an affine transformation. An affine transformation does not necessarily preserve angles between lines or distances between points, though it does preserve ratios of distances between points lying on a straight line.
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