Example 2 : Two-dimentional geometry

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Example 2 : Two-dimentional geometry

Homogenous transforms

Rotate a vector of xyf elements by 1 radian around the point (5,0). For efficiency, the three transformation matrices are concatenated into one before post-multiplying the vector elements. (Of course, ~xlatf(-5,0) is the same as xlat(5,0)):

import arrlib as arr
v = arr.xyfVec(10)
for i in range(10): v[i] = i,0
w = v * (arr.xlatf(-5,0)*arr.rotf(1.0)*~arr.xlatf(-5,0))