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twist:: correct shifts in nil

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Zeno Rogue 2024-06-16 23:00:01 +02:00
parent 6b04db89d2
commit bbc0c10741
1 changed files with 20 additions and 0 deletions
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nonisotropic.cpp
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@ -1296,6 +1296,7 @@ EX namespace hybrid {
const int SHIFT_UNKNOWN = 30000;
map<cell*, vector<int>> shifts;
map<cell*, ld> orig_height;
EX vector<int>& make_shift(cell *c) {
auto& res = shifts[c];
@ -1316,6 +1317,25 @@ EX namespace hybrid {
auto& v = get_shift_current(cw0);
if(v != SHIFT_UNKNOWN) return v;
if(nil) {
/** we prevent possible 'two candidate' errors by computing the correct value, we know all the positions in the underlying map, so we can do that */
transmatrix uT, uU, uT1;
in_underlying([&] {
uT = currentmap->relative_matrix(cw0.at, currentmap->gamestart(), C0);
uU = currentmap->adj(cw0.at, cw0.spin);
uT1 = currentmap->relative_matrix(cw0.cpeek(), currentmap->gamestart(), C0);
});
transmatrix lT = twist::lift_matrix(uT);
transmatrix lU = twist::lift_matrix(uU);
transmatrix lT1 = twist::lift_matrix(uT1);
if(!orig_height.count(cw0.at)) orig_height[cw0.at] = (lT*C0) [2];
if(!orig_height.count(cw0.peek())) orig_height[cw0.peek()] = (lT1*C0) [2];
ld diff = (lT * lU * iso_inverse(lT1) * C0)[2] - orig_height[cw0.at] + orig_height[cw0.peek()];
if(abs(frac(diff / cgi.plevel + 0.5) - 0.5) > 1e-6) throw hr_exception("not an integer");
v = floor(diff / cgi.plevel + 0.5);
return v;
}
vector<int> candidates;
for(int a: {1, -1}) {