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Change winding calculation for points on path

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Add a winding if the point is on the path and windings canceled each other. See discussion at #1109
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Jan 2016-07-20 10:47:01 +02:00 committed by GitHub
parent 1264c2764c
commit 3f893c9fb7
1 changed files with 9 additions and 5 deletions
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14
src/path/PathItem.Boolean.js
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@ -492,11 +492,15 @@ PathItem.inject(new function() {
vClose = null;
}
if (!pathWindingL && !pathWindingR && isOnPath) {
// Use the on-path windings if no other intersections
// were found or if they canceled each other.
var add = path.isClockwise() ? 1 : -1;
// windingL += add;
// windingR -= add;
// If the point is on the path and the windings canceled
// each other, we treat the point as if it was inside the
// path. A point inside a path has a winding of [+1,-1]
// for clockwise and [-1,+1] for counter-clockwise paths.
// If the ray is cast in y direction (dir == 1), the
// windings always have opposite sign.
var add = path.isClockwise() ^ dir ? 1 : -1;
windingL += add;
windingR -= add;
onPathWinding += add;
} else {
windingL += pathWindingL;