diff options
Diffstat (limited to 'dw/types.cc')
| -rw-r--r-- | dw/types.cc | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/dw/types.cc b/dw/types.cc index 630cc8d9..047e7705 100644 --- a/dw/types.cc +++ b/dw/types.cc @@ -177,9 +177,10 @@ bool Polygon::linesCross0(int ax1, int ay1, int ax2, int ay2, /** TODO Some more description */ // If the scalar product is 0, it means that one point is on the second // line, so we check for <= 0, not < 0. - return - zOfVectorProduct (ax1 - bx1, ay1 - by1, bx2 - bx1, by2 - by1) * - zOfVectorProduct (ax2 - bx1, ay2 - by1, bx2 - bx1, by2 - by1) <= 0; + int z1 = zOfVectorProduct (ax1 - bx1, ay1 - by1, bx2 - bx1, by2 - by1); + int z2 = zOfVectorProduct (ax2 - bx1, ay2 - by1, bx2 - bx1, by2 - by1); + + return (z1 <= 0 && z2 >= 0) || (z1 >= 0 && z2 <= 0); } /** |