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Boolean: Improve handling of visited segments in intersect() operations.

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Closes #1123
This commit is contained in:
Jürg Lehni 2016-07-27 19:35:19 +02:00
parent aee9a3190d
commit 14b2d76450
2 changed files with 51 additions and 48 deletions
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39
src/path/PathItem.Boolean.js
View file

@ -143,9 +143,9 @@ PathItem.inject(new function() {
var path = paths[i];
segments.push.apply(segments, path._segments);
curves.push.apply(curves, path.getCurves());
// Keep track if there are valid intersections other than
// overlaps in each path.
path._overlapsOnly = path._validOverlapsOnly = true;
// See if all encountered segments in a path are overlaps, to
// be able to separately handle fully overlapping paths.
path._overlapsOnly = true;
}
}
@ -168,17 +168,9 @@ PathItem.inject(new function() {
if (segment._winding == null) {
propagateWinding(segment, _path1, _path2, curves, operator);
}
// See if there are any valid segments that aren't part of
// overlaps. Use this information to determine how to deal with
// various edge-cases in tracePaths().
if (!(inter && inter._overlap)) {
var path = segment._path;
path._overlapsOnly = false;
// This is no overlap. If it is valid, take note that this
// path contains valid intersections other than overlaps.
if (operator[segment._winding.winding])
path._validOverlapsOnly = false;
}
// See if all encountered segments in a path are overlaps.
if (!(inter && inter._overlap))
segment._path._overlapsOnly = false;
}
paths = tracePaths(segments, operator);
}
@ -741,9 +733,8 @@ PathItem.inject(new function() {
seg = segments[i],
inter = seg._intersection,
handleIn;
// If all encountered segments in a path are overlaps (regardless if
// valid or not), we may have two fully overlapping paths that need
// special handling.
// If all encountered segments in a path are overlaps, we may have
// two fully overlapping paths that need special handling.
if (!seg._visited && seg._path._overlapsOnly) {
// TODO: Don't we also need to check for multiple overlaps?
var path1 = seg._path,
@ -788,12 +779,6 @@ PathItem.inject(new function() {
// segment. See isValid()/getWinding() for explanations.
// We are at a crossing and the other segment is part of
// the boolean result, switch over.
// We need to mark segments as visited when processing
// intersection and subtraction.
if (operator
&& (operator.intersect || operator.subtract)) {
seg._visited = true;
}
seg = other;
}
}
@ -806,12 +791,8 @@ PathItem.inject(new function() {
closed = seg._path._closed;
break;
}
// If a visited or invalid segment is encountered, bail out
// immediately. But if there aren't only valid overlaps, be more
// tolerant due to complex crossing situations.
// See findBestIntersection()
if (seg._visited
|| seg._path._validOverlapsOnly && !isValid(seg))
// If a invalid segment is encountered, bail out immediately.
if (!isValid(seg))
break;
if (!path) {
path = new Path(Item.NO_INSERT);

60
test/tests/Path_Boolean.js
View file

@ -653,6 +653,28 @@ test('#1075', function() {
'M140,125l0,-65l210,0l0,65l-35,0l0,-5l-137,0l0,5z M315,85l-137,0l0,25l137,0z');
});
test('#1123', function() {
var p1 = new paper.Path({
segments: [
[29.562573408343212, 132.54192488999095, 0, 0, -1.417935581083043, 0.174100597711913],
[2.5662795205536213, 124.83546947214427, 13.887634830511104, -1.705187144644185, 0, 0],
[18.447017946814753, 122.88555997766193, 0, 0, 13.88763483051116, -1.7051871446442135],
[45.443311834604344, 130.5920153955086, -1.417935581083043, 0.17410059771188457, 0, 0]
],
closed: true
});
var p2 = new paper.Path({
segments: [
[5.684341886080802e-14, 132.07000000000002, 12.910000000000025, 27.075000000000017, 21.125, -21.119999999999976],
[44.59500000000003, 130.54000000000005, 0, 2.3300000000000125, 4.816669792192272, -4.501887430254385],
[56.887403180177614, 116.74936916538223, -3.66267533741933, 4.517228939026069, 0.002528361414420033, 50]
],
closed: true
});
compareBoolean(function() { return p1.intersect(p2); },
'M29.56257,132.54192c-1.1465,0.14077 -9.00925,-6.09934 -19.31903,-7.59213c2.44054,-1.04008 4.85728,-1.65337 7.21093,-1.94237c13.88763,-1.70519 25.57836,7.88056 26.99629,7.70646zM44.75533,130.3897c0.31974,0.14538 0.55147,0.21908 0.68798,0.20232l-0.99255,0.12187c0.09534,-0.01171 0.14423,-0.06753 0.14423,-0.17388c0.05357,-0.05007 0.10701,-0.10017 0.16033,-0.1503z');
});
test('frame.intersect(rect);', function() {
var frame = new CompoundPath();
frame.addChild(new Path.Rectangle(new Point(140, 10), [100, 300]));
@ -850,34 +872,34 @@ test('Isolated edge-cases from @iconexperience\'s boolean-test suite', function(
'M491.2068726546696,153.8836372207983c2.67966717656293,-4.344087653601775 -5.988630526531892,6.5447012048449835 -4.103367938301176,19.82205168468778l59.40415261280532,-8.434847500372314c1.8912589260252162,13.319580925081453 -6.821144106809129,24.30583609819925 -4.234803410140444,20.11304275928262z'
]];
var results = [
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