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Revert "Never starting in intersections allows for further code simplifications."

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This reverts commit 892154e8f8.
This commit is contained in:
Jürg Lehni 2015-10-09 10:18:45 +02:00
parent 892154e8f8
commit c45ae4b51a
1 changed files with 17 additions and 8 deletions
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25
src/path/PathItem.Boolean.js
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@ -566,6 +566,7 @@ PathItem.inject(new function() {
var paths = [],
start,
otherStart,
operator = operators[operation],
// Adjust winding contributions for specific operations on overlaps:
overlapWinding = {
@ -585,6 +586,10 @@ PathItem.inject(new function() {
return operator(winding);
}
function isStart(seg) {
return seg === start || seg === otherStart;
}
/**
* Checks if the curve from seg1 to seg2 is part of an overlap.
*/
@ -616,7 +621,7 @@ PathItem.inject(new function() {
+ nextSeg._index
+ ', seg vis:' + !!seg._visited
+ ', next vis:' + !!nextSeg._visited
+ ', next start:' + (nextSeg === start)
+ ', next start:' + isStart(nextSeg)
+ ', seg wi:' + seg._winding
+ ', next wi:' + nextSeg._winding
+ ', seg op:' + isValid(seg, true)
@ -643,7 +648,7 @@ PathItem.inject(new function() {
// result, the non-strict mode is used, in which invalid current
// segments are tolerated, and overlaps for the next segment are
// allowed as long as they are valid when not adjusted.
if (nextSeg === start
if (isStart(nextSeg)
|| !seg._visited && !nextSeg._visited
// Self-intersections (!operator) don't need isValid() calls
&& (!operator
@ -670,13 +675,14 @@ PathItem.inject(new function() {
for (var i = 0, l = segments.length; i < l; i++) {
var seg = segments[i],
path = null;
path = null,
finished = false;
// Do not start a chain with segments that have intersections,
// segments that are already visited, or that are invalid.
if (seg._intersection || !isValid(seg))
continue;
start = null;
while (seg !== start) {
start = otherStart = null;
while (!finished) {
var inter = seg._intersection;
// Once we started a chain, see if there are multiple
// intersections, and if so, pick the best one:
@ -735,8 +741,9 @@ PathItem.inject(new function() {
drawSegment(seg, null, 'stay', i, 'blue');
}
if (seg._visited) {
if (seg === start) {
if (isStart(seg)) {
drawSegment(seg, null, 'done', i, 'red');
finished = true;
} else {
// We didn't manage to switch, so stop right here.
console.error('Visited segment encountered, aborting #'
@ -750,21 +757,23 @@ PathItem.inject(new function() {
if (!path) {
path = new Path(Item.NO_INSERT);
start = seg;
otherStart = other;
}
// Add the current segment to the path, and mark the added
// segment as visited.
path.add(new Segment(seg._point, handleIn, seg._handleOut));
seg._visited = true;
seg = seg.getNext();
if (seg === start) {
if (isStart(seg)) {
drawSegment(seg, null, 'done', i, 'red');
finished = true;
}
}
if (!path)
continue;
// Finish with closing the paths if necessary, correctly linking up
// curves etc.
if (seg === start) {
if (finished) {
path.firstSegment.setHandleIn(seg._handleIn);
path.setClosed(true);
if (window.reportSegments) {