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Code Issues Releases Wiki Activity

improved get_parent_dir

This commit is contained in:
Zeno Rogue 2021-08-15 18:06:23 +02:00
parent 749b8aead6
commit fc0763362e
1 changed files with 31 additions and 22 deletions
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53
rulegen.cpp
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@ -515,29 +515,38 @@ int get_parent_dir(tcell *c) {
auto& sh = arb::current.shapes[c->id];
int n = sh.size();
int k = sh.cycle_length;
vector<int> olen;
for(int i=0; i<k; i++) {
vector<int> nearer;
for(int j=0; j<n/k; j++) {
tcell *c1 = c->cmove(i+j*k);
be_solid(c1);
olen.push_back(c1->dist);
if(c1->dist < c->dist) {
nearer.push_back(j);
}
}
if(nearer.size() == 1) {bestd = i+nearer[0]*k; break; }
if(nearer.size() == 2 && nearer[1] == nearer[0] + 1) {
bestd = i + nearer[0] * k;
break;
}
if(nearer.size() == 2 && nearer[0] == 0 && nearer[1] == n/k-1) {
bestd = i + nearer[1] * k;
break;
}
if(nearer.size() > 1) throw rulegen_failure("still confused");
vector<int> nearer;
auto beats = [&] (int i, int old) {
if(old == -1) return true;
if(i%k != old%k) return i%k < old%k;
if(i < (n+1)/2) return i < old && old < i+n/2;
return i < old || old < i-(n+1)/2;
};
int d = c->dist;
for(int i=0; i<n; i++) {
tcell *c1 = c->cmove(i);
be_solid(c1);
if(c1->dist < d) nearer.push_back(i);
}
ufindc(c); if(d != c->dist) return get_parent_dir(c);
// celebrity identification problem
for(auto ne: nearer)
if(beats(ne, bestd))
bestd = ne;
for(auto ne: nearer)
if(ne != bestd && beats(ne, bestd))
throw rulegen_failure("still confused");
if(bestd == -1) {
throw rulegen_failure("should not happen");
}
if(bestd == -1) throw rulegen_failure("should not happen");
}
c->parent_dir = bestd;