scratchfoundation/paper.js
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Remove the need to store winding samples in array and sort.

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Calculating the average winding value instead yields the same results.
This commit is contained in:
Jürg Lehni 2015-01-03 11:25:10 +01:00
parent 26f209c835
commit 51ec3325e3
1 changed files with 7 additions and 8 deletions
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15
src/path/PathItem.Boolean.js
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@ -62,7 +62,6 @@ PathItem.inject(new function() {
splitPath(_path1.getIntersections(_path2, null, true));
var chain = [],
windings = [],
segments = [],
// Aggregate of all curves in both operands, monotonic in y
monoCurves = [],
@ -98,15 +97,16 @@ PathItem.inject(new function() {
// intersection or end of a curve chain.
chain.length = 0;
var startSeg = segment,
totalLength = 0;
totalLength = 0,
windingSum = 0;
do {
var length = segment.getCurve().getLength();
chain.push({ segment: segment, length: length });
totalLength += length;
segment = segment.getNext();
} while (segment && !segment._intersection && segment !== startSeg);
// Select the median winding of three evenly distributed points
// along this curve chain, as a representative winding number.
// Calculate the average winding among three evenly distributed
// points along this curve chain as a representative winding number.
// This selection gives a better chance of returning a correct
// winding than equally dividing the curve chain, with the same
// (amortised) time.
@ -131,7 +131,7 @@ PathItem.inject(new function() {
// While subtracting, we need to omit this curve if this
// curve is contributing to the second operand and is
// outside the first operand.
windings[j] = subtract && _path2
windingSum += subtract && _path2
&& (path === _path1 && _path2._getWinding(pt, hor)
|| path === _path2 && !_path1._getWinding(pt, hor))
? 0
@ -141,9 +141,8 @@ PathItem.inject(new function() {
length -= curveLength;
}
}
windings.sort();
// Assign the median winding to the entire curve chain.
var winding = windings[1];
// Assign the average winding to the entire curve chain.
var winding = Math.round(windingSum / 3);
for (var j = chain.length - 1; j >= 0; j--)
chain[j].segment._winding = winding;
}