ism3d.utils.rotate_xy

ism3d.utils.rotate_xy(x, y, angle, xo=0, yo=0)

rotate points in a 2D coordinate system angle: rotate points by angle in CCW ref: rotate_xy.pro rot_3d.pro performance consideration:

https://gist.github.com/LyleScott/e36e08bfb23b1f87af68c9051f985302 https://stackoverflow.com/questions/33004551/why-is-b-numpy-dota-x-so-much-slower-looping-through-doing-bi-numpy https://en.wikipedia.org/wiki/Rotation_matrix