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Fix winding calculation in rare edge case.

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Closes #889
This commit is contained in:
Jürg Lehni 2016-01-06 00:34:23 +01:00
parent 17d000266f
commit d89995a781
1 changed files with 5 additions and 2 deletions
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7
src/path/PathItem.Boolean.js
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@ -401,14 +401,17 @@ PathItem.inject(new function() {
// the ray. This essentially is not a crossing. // the ray. This essentially is not a crossing.
if (Numerical.isZero(slope) if (Numerical.isZero(slope)
&& !Curve.isStraight(values) && !Curve.isStraight(values)
// NOTE: We include 0 in the checks, since
// even following a horizontal tangent is a
// tip that is only touched, not crossed.
// Does the slope over the beginning change? // Does the slope over the beginning change?
|| t < tMin && prevCurve || t < tMin && prevCurve
&& slope * Curve.getTangent( && slope * Curve.getTangent(
prevCurve.values, 1).y < 0 prevCurve.values, 1).y <= 0
// Does the slope over the end change? // Does the slope over the end change?
|| t > tMax && nextCurve || t > tMax && nextCurve
&& slope * Curve.getTangent( && slope * Curve.getTangent(
nextCurve.values, 0).y < 0) { nextCurve.values, 0).y <= 0) {
if (x > xBefore && x < xAfter) { if (x > xBefore && x < xAfter) {
++windLeft; ++windLeft;
++windRight; ++windRight;