scratchfoundation/paper.js
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Fix issue with curve tangents in rare edge-cases.

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We should fix Curve.evaluate() for these instead.
This commit is contained in:
Jürg Lehni 2014-02-20 03:22:38 +01:00
parent b89fc84789
commit 2a58828e81
1 changed files with 6 additions and 4 deletions
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10
src/path/PathItem.js
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@ -463,16 +463,18 @@ statics: {
&& (ixOtherSeg = ixOther._segment)
&& ixOtherSeg !== startSeg && firstHandleIn) {
c1 = seg.getCurve();
// TODO: Support getTangentAt(0) / (1)
var offset = 1e-3;
if (direction < 1) {
t1 = c1.getTangentAt(0, true);
t1 = c1.getTangentAt(offset, true);
} else {
c1 = c1.getPrevious();
t1 = c1.getTangentAt(1, true).negate();
t1 = c1.getTangentAt(1 - offset, true).negate();
}
c4 = crvTan[1].c = ixOtherSeg.getCurve();
c3 = crvTan[0].c = c4.getPrevious();
crvTan[0].t = c3.getTangentAt(1, true).negate();
crvTan[1].t = c4.getTangentAt(0, true);
crvTan[0].t = c3.getTangentAt(1 - offset, true).negate();
crvTan[1].t = c4.getTangentAt(offset, true);
// cross product of the entry and exit tangent vectors at
// the intersection, will let us select the correct countour
// to traverse next.