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ru:: ellipse platforms

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Zeno Rogue
2026-03-31 00:44:45 +02:00
parent 40d30460d3
commit e662ab1de3
3 changed files with 45 additions and 0 deletions
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10
rogueviz/ru/classes.cpp
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@@ -484,6 +484,16 @@ struct pendulum_platform : public moving_platform {
string get_help() override { return "These pendulum platforms go back and forth between two locations, taking the shortest path possible."; }
};
struct ellipse_platform : public moving_platform {
xy a, b;
ld ratio, period, shift;
vector<hyperpoint> points;
vector<ld> lengthsum;
xy location_at(ld t) override;
string get_name() override { return "ellipse platform"; }
string get_help() override { return "These platforms go in an ellipse."; }
};
struct rope_platform : public moving_platform {
ld period, shift, dist, max_swing;
xy location_at(ld t) override;

30
rogueviz/ru/entity.cpp
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@@ -623,6 +623,36 @@ xy pendulum_platform::location_at(ld t) {
return from_hyper(rgpushxto0(h1) * rspintox(gpushxto0(h1) * h2) * xpush0(x));
}
xy ellipse_platform::location_at(ld t) {
if(points.empty()) {
auto h1 = to_hyper(a);
auto h2 = to_hyper(b);
auto m = mid(h1, h2);
ld wanted = hdist(h1, h2) * ratio;
for(int it=0; it<360; it++) {
auto p = [&] (ld x) { return rgpushxto0(m) * spin(it*1._deg) * xpush0(x); };
ld x = binsearch(0, 5, [&] (ld x) { auto px = p(x); return hdist(h1, px) + hdist(h2, px) >= wanted; });
points.push_back(p(x));
}
int N = isize(points);
points.push_back(points[0]);
ld ls = 0;
for(int i=0; i<N; i++) {
lengthsum.push_back(ls);
ls += hdist(points[i], points[i+1]);
}
lengthsum.push_back(ls);
}
ld our_t = t / (period * game_fps);
our_t -= floor(our_t);
our_t *= lengthsum.back();
auto it = lower_bound(lengthsum.begin(), lengthsum.end(), our_t);
auto index = it - lengthsum.begin();
auto& h1 = points[index-1];
auto& h2 = points[index];
return from_hyper(rgpushxto0(h1) * rspintox(gpushxto0(h1) * h2) * xpush0(our_t - lengthsum[index-1]));
}
void moving_platform::draw() {
double d = get_scale();
auto wi = width();

5
rogueviz/ru/load-world.cpp
View File

@@ -321,6 +321,11 @@ void load_room(fhstream& f, cell *c) {
b->a = get_xy(); b->b = get_xy(); b->period = get_ld(); b->shift = get_ld();
r.entities.emplace_back(std::move(b));
}
else if(cap == "ELLIPSE") {
auto b = std::make_unique<ellipse_platform>();
b->a = get_xy(); b->b = get_xy(); b->period = get_ld(); b->shift = get_ld(); b->ratio = get_ld();
r.entities.emplace_back(std::move(b));
}
else if(cap == "HINT") {
auto b = std::make_unique<hint>();
b->respawn = get_xy(); b->size = get_xy();