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arb:: unmirror functionality

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This commit is contained in:
Zeno Rogue 2021-07-04 09:32:04 +02:00
parent 241e731663
commit 0cad3a55f9
1 changed files with 36 additions and 0 deletions
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36
arbitrile.cpp
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@ -222,6 +222,41 @@ EX void load_tile(exp_parser& ep, arbi_tiling& c, bool unit) {
cc.stretch_shear.resize(cc.size(), make_pair(1, 0));
}
EX bool do_unmirror = true;
/** \brief for tessellations which contain mirror rules, remove them by taking the orientable double cover */
EX void unmirror() {
int mirror_rules = 0;
for(auto s: arb::current.shapes)
for(auto t: s.connections)
if(get<2>(t))
mirror_rules++;
if(!mirror_rules) return;
auto& sh = current.shapes;
int s = isize(sh);
for(int i=0; i<s; i++)
sh.push_back(sh[i]);
for(int i=s; i<s+s; i++) {
for(auto& v: sh[i].vertices)
v[1] = -v[1];
reverse(sh[i].edges.begin(), sh[i].edges.end());
reverse(sh[i].vertices.begin()+1, sh[i].vertices.end());
reverse(sh[i].angles.begin(), sh[i].angles.end()-1);
reverse(sh[i].connections.begin(), sh[i].connections.end());
}
if(true) for(int i=0; i<s+s; i++) {
for(auto& co: sh[i].connections) {
bool mirr = get<2>(co) ^ (i >= s);
get<2>(co) = false;
if(mirr) {
get<0>(co) += s;
get<1>(co) = isize(sh[get<0>(co)].angles) - 1 - get<1>(co);
}
}
}
}
EX void load(const string& fname, bool after_sliding IS(false)) {
fhstream f(fname, "rt");
if(!f.f) throw hr_parse_exception("file " + fname + " does not exist");
@ -472,6 +507,7 @@ EX void load(const string& fname, bool after_sliding IS(false)) {
}
}
}
if(do_unmirror) unmirror();
if(!after_sliding) slided = current;
}