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Boolean: Sort segments to give non-ambiguous segments preference when tracing.

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Relates to #1075
This commit is contained in:
Jürg Lehni 2016-07-16 23:55:16 +02:00
parent 91e67887da
commit 064cee1629
1 changed files with 12 additions and 2 deletions
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14
src/path/PathItem.Boolean.js
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@ -632,6 +632,17 @@ PathItem.inject(new function() {
return null; return null;
} }
// Sort segments to give non-ambiguous segments the preference as
// starting points when tracing: prefer segments with no intersections
// over intersections, and process intersections with overlaps last:
segments.sort(function(a, b) {
var i1 = a._intersection,
i2 = b._intersection,
o1 = !!(i1 && i1._overlap),
o2 = !!(i2 && i2._overlap);
return !i1 && !i2 ? -1 : o1 ^ o2 ? o1 ? 1 : -1 : 0;
});
for (var i = 0, l = segments.length; i < l; i++) { for (var i = 0, l = segments.length; i < l; i++) {
var path = null, var path = null,
finished = false, finished = false,
@ -666,8 +677,7 @@ PathItem.inject(new function() {
// contribution but are part of the contour (excludeContour=true). // contribution but are part of the contour (excludeContour=true).
// - Do not start in overlaps, unless all segments are part of // - Do not start in overlaps, unless all segments are part of
// overlaps, in which case we have no other choice. // overlaps, in which case we have no other choice.
if (!isValid(seg, true) if (!isValid(seg, true))
|| !seg._path._validOverlapsOnly && inter && inter._overlap)
continue; continue;
start = otherStart = null; start = otherStart = null;
while (true) { while (true) {