scratchfoundation/paper.js
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Switch to sampling only one location for winding contribution.

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Closes #1073
This commit is contained in:
Jürg Lehni 2016-06-13 11:26:02 +02:00
parent 4c94553b81
commit 34c35e26bd
1 changed files with 29 additions and 35 deletions
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28
src/path/PathItem.Boolean.js
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@ -438,7 +438,7 @@ PathItem.inject(new function() {
var chain = [],
start = segment,
totalLength = 0,
windingSum = 0;
winding = 0;
do {
var curve = segment.getCurve(),
length = curve.getLength();
@ -446,11 +446,8 @@ PathItem.inject(new function() {
totalLength += length;
segment = segment.getNext();
} while (segment && !segment._intersection && segment !== start);
// Calculate the average winding among three evenly distributed points
// along this curve chain as a representative winding number.
for (var i = 0; i < 3; i++) {
// Sample the points at 3 equal intervals along the total length:
var length = totalLength * (i + 1) / 4;
// Sample the point at a middle of the chain to get its winding:
var length = totalLength / 2;
for (var j = 0, l = chain.length; j < l; j++) {
var entry = chain[j],
curveLength = entry.length;
@ -467,23 +464,20 @@ PathItem.inject(new function() {
// While subtracting, we need to omit this curve if it is
// contributing to the second operand and is outside the
// first operand.
if (!(operator.subtract && path2
&& (path === path1
&& path2._getWinding(pt, operator, hor)
|| path === path2
&& !path1._getWinding(pt, operator, hor)))) {
windingSum += getWinding(pt, monoCurves, operator, hor);
}
winding = !(operator.subtract && path2 && (
path === path1 && path2._getWinding(pt, operator, hor) ||
path === path2 && !path1._getWinding(pt, operator, hor)))
? getWinding(pt, monoCurves, operator, hor)
: 0;
break;
}
length -= curveLength;
}
}
// Assign the average winding to the entire curve chain.
var winding = Math.round(windingSum / 3);
for (var j = chain.length - 1; j >= 0; j--)
// Now assign the winding to the entire curve chain.
for (var j = chain.length - 1; j >= 0; j--) {
chain[j].segment._winding = winding;
}
}
/**
* Private method to trace closed paths from a list of segments, according