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Fix multiply duplicated spikes

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This commit is contained in:
Erica Fischer
2023-11-09 14:26:13 -08:00
parent 5ba24f0712
commit 6bd0cdcb1b
1 changed files with 10 additions and 5 deletions
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polygon.cpp
+10 -5
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@@ -34,7 +34,7 @@ struct point {
typedef std::pair<point, point> segment;
void fix_opposites(std::vector<segment> &segs) {
std::map<segment, size_t> opposites;
std::multimap<segment, size_t> opposites;
segment erased = std::make_pair(point(INT_MAX, INT_MAX), point(INT_MAX, INT_MAX));
for (size_t i = 0; i < segs.size(); i++) {
@@ -47,11 +47,16 @@ void fix_opposites(std::vector<segment> &segs) {
continue;
}
auto f = opposites.find(segs[i]);
if (f != opposites.end()) {
auto f = opposites.equal_range(segs[i]);
for (; f.first != f.second; ++f.first) {
if (segs[f.first->second] == erased) {
continue;
}
segs[i] = erased;
segs[f->second] = erased;
opposites.erase(f);
segs[f.first->second] = erased;
opposites.erase(f.first);
break;
}
}