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並前往https://stackoverflow.com/questions/13221873/determining-if-one-2d-vector-is-to-the-right-or-left-of-another

Determining if one 2D vector is to the right or left of another

You can achieve this using a dot product. dot(a, b) == a.x*b.x + a.y*b.y can be used to find whether vectors are perpendicular:

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