fixed handling of collinear, included lines #2
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doLineSegmentsIntersect did not correctly handle [Px, Qx, Qx, Px] and [Qx, Px, Px, Qx] (for Px \elem (P, P2), Qx \elem (Q, Q2), (P, P2, Q, Q2) collinear). The xor trick with "!=" does not work for an even number of truthy values.
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Thanks @siebenschlaefer and @pgkelley4, adapted this solution for C++ and seems to be working allright :). This problem has been biting me all weekend!. |
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Good catch @siebenschlaefer. Missed this. |
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doLineSegmentsIntersect did not correctly handle [Px, Qx, Qx, Px]
and [Qx, Px, Px, Qx] (for Px \elem (P, P2), Qx \elem (Q, Q2), (P, P2, Q,
Q2) collinear). The xor trick with "!=" does not work for an even number
of truthy values.