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Trying to make clipped lines be the correct half

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Erica Fischer
2024-02-23 11:42:45 -08:00
parent aeba5d604c
commit c594382ffc
1 changed files with 33 additions and 8 deletions
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polygon.cpp
+33 -8
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@@ -167,8 +167,14 @@ std::pair<double, double> get_line_intersection(long long p0_x, long long p0_y,
bool vertical(std::vector<segment> &segs, size_t s, long long y) {
if ((y > segs[s].first.y && y < segs[s].second.y) ||
(y > segs[s].second.y && y < segs[s].first.y)) {
segs.push_back(std::make_pair(point(segs[s].first.x, y), segs[s].second));
segs[s] = std::make_pair(segs[s].first, point(segs[s].first.x, y));
// existing ID always keeps the bottom half
if (segs[s].first.y > segs[s].second.y) {
segs.push_back(std::make_pair(point(segs[s].first.x, y), segs[s].second));
segs[s] = std::make_pair(segs[s].first, point(segs[s].first.x, y));
} else {
segs.push_back(std::make_pair(segs[s].first, point(segs[s].first.x, y)));
segs[s] = std::make_pair(point(segs[s].first.x, y), segs[s].second);
}
return true;
}
@@ -182,8 +188,15 @@ bool horizontal(std::vector<segment> &segs, size_t s, long long x) {
double slope = (segs[s].second.y - segs[s].first.y) /
(double) (segs[s].second.x - segs[s].first.x);
long long y = std::llround(segs[s].first.y + slope * (x - segs[s].first.x));
segs.push_back(std::make_pair(point(x, y), segs[s].second));
segs[s] = std::make_pair(segs[s].first, point(x, y));
// existing ID always keeps the bottom half
if (segs[s].first.y > segs[s].second.y) {
segs.push_back(std::make_pair(point(x, y), segs[s].second));
segs[s] = std::make_pair(segs[s].first, point(x, y));
} else {
segs.push_back(std::make_pair(segs[s].first, point(x, y)));
segs[s] = std::make_pair(point(x, y), segs[s].second);
}
return true;
}
@@ -285,8 +298,15 @@ bool intersect(std::vector<segment> &segs, size_t s1, size_t s2) {
// at an endpoint in s1, so it doesn't need to be changed
} else {
// printf("introduce %f,%f in %f,%f to %f,%f (s1 %zu %zu)\n", x, y, segs[s1].first.x, segs[s1].first.y, segs[s1].second.x, segs[s1].second.y, s1, s2);
segs.push_back(std::make_pair(point(x, y), segs[s1].second));
segs[s1] = std::make_pair(segs[s1].first, point(x, y));
// existing segment id needs to go to the *bottom* half,
// so it will still end at the right Y coordinate
if (segs[s1].first.y > segs[s1].second.y) {
segs.push_back(std::make_pair(point(x, y), segs[s1].second));
segs[s1] = std::make_pair(segs[s1].first, point(x, y));
} else {
segs.push_back(std::make_pair(segs[s1].first, point(x, y)));
segs[s1] = std::make_pair(point(x, y), segs[s1].second);
}
changed = true;
}
@@ -297,8 +317,13 @@ bool intersect(std::vector<segment> &segs, size_t s1, size_t s2) {
} else {
// printf("introduce %f,%f in %f,%f to %f,%f (s2 %zu %zu)\n", x, y, segs[s2].first.x, segs[s2].first.y, segs[s2].second.x, segs[s2].second.y, s1, s2);
// printf("introduce %lld,%lld in %lld,%lld to %lld,%lld (s2)\n", std::llround(x), std::llround(y), std::llround(segs[s2].first.x), std::llround(segs[s2].first.y), std::llround(segs[s2].second.x), std::llround(segs[s2].second.y));
segs.push_back(std::make_pair(point(x, y), segs[s2].second));
segs[s2] = std::make_pair(segs[s2].first, point(x, y));
if (segs[s2].first.y > segs[s2].second.y) {
segs.push_back(std::make_pair(point(x, y), segs[s2].second));
segs[s2] = std::make_pair(segs[s2].first, point(x, y));
} else {
segs.push_back(std::make_pair(segs[s2].first, point(x, y)));
segs[s2] = std::make_pair(point(x, y), segs[s2].second);
}
changed = true;
}