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arb:: compute_vertex_valence function

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This commit is contained in:
Zeno Rogue 2021-07-23 14:08:43 +02:00
parent 46a3cf220f
commit d2fdfc02ea
1 changed files with 53 additions and 1 deletions
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54
arbitrile.cpp
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@ -42,6 +42,8 @@ struct shape {
vector<pair<int, int> > sublines;
vector<pair<ld, ld>> stretch_shear;
int repeat_value;
int cycle_length;
vector<int> vertex_valence;
};
struct slider {
@ -269,6 +271,51 @@ EX void unmirror() {
}
}
EX void compute_vertex_valence() {
auto& shs = arb::current.shapes;
for(int i=0; i<isize(shs); i++) {
auto& sh = shs[i];
int n = isize(sh.vertices);
sh.cycle_length = n;
for(int k=0; k<n; k++) {
auto co = sh.connections[k];
co = shs[co.sid].connections[co.eid];
if(co.sid != i) throw hr_parse_exception("connection error in compute_stats");
sh.cycle_length = gcd(sh.cycle_length, k-co.eid);
}
if(debugflags & DF_GEOM)
println(hlog, "tile ", i, " cycle_length = ", sh.cycle_length, " / ", n);
}
if(cgflags & qAFFINE) return;
for(int i=0; i<isize(shs); i++) {
int n = isize(shs[i].vertices);
shs[i].vertex_valence.resize(n);
for(int k=0; k<n; k++) {
ld total = 0;
int qty = 0;
connection_t at = {i, k, false};
do {
total += shs[at.sid].angles[at.eid];
qty++;
at.eid++;
if(at.eid == isize(shs[at.sid].angles)) at.eid = 0;
at = shs[at.sid].connections[at.eid];
}
while(total < 360*degree - 1e-6);
if(total > 360*degree + 1e-6) throw hr_parse_exception("improper total in compute_stats");
if(at.sid != i) throw hr_parse_exception("ended at wrong type determining vertex_valence");
if((at.eid - k) % shs[i].cycle_length) throw hr_parse_exception("ended at wrong edge determining vertex_valence");
shs[i].vertex_valence[k] = qty;
}
if(debugflags & DF_GEOM)
println(hlog, "computed vertex_valence of ", i, " as ", shs[i].vertex_valence);
}
}
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");
@ -515,7 +562,12 @@ EX void load(const string& fname, bool after_sliding IS(false)) {
}
}
}
if(do_unmirror) unmirror();
if(do_unmirror) {
unmirror();
compute_vertex_valence();
}
if(!after_sliding) slided = current;
}