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Don't revive spikes that are beyond the tile edge

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This commit is contained in:
Erica Fischer
2023-11-14 12:19:18 -08:00
parent b22d6c8ba1
commit 78a964776f
1 changed files with 19 additions and 6 deletions
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polygon.cpp
+19 -6
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@@ -40,7 +40,20 @@ struct point {
typedef std::pair<point, point> segment;
bool fix_opposites(std::vector<segment> &segs, std::set<segment> &affected) {
bool visible(segment const &seg, long long extent) {
long long minx = std::min(seg.first.x, seg.second.x);
long long miny = std::min(seg.first.y, seg.second.y);
long long maxx = std::max(seg.first.x, seg.second.x);
long long maxy = std::max(seg.first.y, seg.second.y);
if (maxx <= 0 || maxy <= 0 || minx >= extent || miny >= extent) {
return false;
} else {
return true;
}
}
bool fix_opposites(std::vector<segment> &segs, std::set<segment> &affected, long long extent) {
bool changed = false;
std::multimap<segment, size_t> opposites;
segment erased = std::make_pair(point(INT_MAX, INT_MAX), point(INT_MAX, INT_MAX));
@@ -64,8 +77,8 @@ bool fix_opposites(std::vector<segment> &segs, std::set<segment> &affected) {
long long dx = segs[i].second.x - segs[i].first.x;
long long dy = segs[i].second.y - segs[i].first.y;
long long dsq = dx * dx + dy * dy;
if (dsq >= 5 * 5) {
// alter the segments instead to keep it from collapsing away
if (visible(segs[i], extent) && dsq >= 5 * 5) {
// alter the segment instead to keep it from collapsing away
double ang = atan2(dy, dx) - M_PI / 2;
long long cx = std::llround((segs[i].second.x + segs[i].first.x) / 2.0 + sqrt(2) / 2.0 * cos(ang));
@@ -316,7 +329,7 @@ struct scan_transition {
}
};
void snap_round(std::vector<segment> &segs) {
void snap_round(std::vector<segment> &segs, long long extent) {
bool again = true;
// affected is indexed by segment instead of just segment index
@@ -342,7 +355,7 @@ void snap_round(std::vector<segment> &segs) {
// in the course of trying to keep spindles alive, and will then need to
// resolve those.
if (fix_opposites(segs, affected)) {
if (fix_opposites(segs, affected, extent)) {
again = true;
}
@@ -853,7 +866,7 @@ drawvec clean_polygon(drawvec geom, int z, int detail) {
// snap-round intersecting segments
snap_round(segments);
snap_round(segments, 1LL << detail);
// reassemble segments into rings