Find Right Angle to a Vector

BlitzMax Forums/BlitzMax Programming/Find Right Angle to a Vector

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skidracer

rotate through any degree:

[dx,dy] x [ cos a, -sin a]
          [ sin a,  cos a]

plug 90` into the rotation matrix and you get the rotation matrix

[ 0 , -1 ]
[ 1,  0  ]

and simplify the result:

[dy,-dx]