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fixed a bug when lines in a polygon are parallel

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This commit is contained in:
Thomas Friedel 2018-09-18 14:15:42 +02:00
parent 77993ea244
commit caaba150e8
1 changed files with 5 additions and 1 deletions
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6
paths.go
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@ -501,7 +501,11 @@ func lineIntersection(a0, a1, b0, b1 vec) (vec, float64, float64) {
if (va[0] == 0 && vb[0] == 0) || (va[1] == 0 && vb[1] == 0) || (va[0] == 0 && va[1] == 0) || (vb[0] == 0 && vb[1] == 0) {
return vec{}, float64(math.Inf(1)), float64(math.Inf(1))
}
p := (vb[1]*(a0[0]-b0[0]) - a0[1]*vb[0] + b0[1]*vb[0]) / (va[1]*vb[0] - va[0]*vb[1])
d := va[1]*vb[0] - va[0]*vb[1]
if d == 0 {
return vec{}, float64(math.Inf(1)), float64(math.Inf(1))
}
p := (vb[1]*(a0[0]-b0[0]) - a0[1]*vb[0] + b0[1]*vb[0]) / d
var q float64
if vb[0] == 0 {
q = (a0[1] + p*va[1] - b0[1]) / vb[1]