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arb:: utilities for making Archimedean tilings

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Zeno Rogue
2020-03-22 11:27:06 +01:00
parent 3b5e31156d
commit 32c6228319
3 changed files with 66 additions and 8 deletions
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50
util.cpp
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@@ -223,7 +223,55 @@ cld exp_parser::parse(int prio) {
force_eat(",");
cld b = rparse(0);
force_eat(")");
return edge_of_triangle_with_angles(M_PI/2, M_PI/real(a), M_PI/real(b));
res = edge_of_triangle_with_angles(M_PI/2, M_PI/a, M_PI/b);
}
else if(eat("arcmedge(")) {
vector<int> vals;
vals.push_back(iparse(0));
while(true) {
skip_white();
if(eat(",")) vals.push_back(iparse(0));
else break;
}
force_eat(")");
arcm::archimedean_tiling test;
test.faces = vals;
test.compute_sum();
test.compute_geometry();
res = test.edgelength;
if(extra_params.count("distunit"))
res /= extra_params["distunit"];
}
else if(eat("regangle(")) {
ld edgelen = rparse(0);
if(extra_params.count("distunit")) {
println(hlog, "got edgelen = ", edgelen);
println(hlog, "distunit = ", real(extra_params["distunit"]));
edgelen = real(edgelen * extra_params["distunit"]);
println(hlog, "got edgelen = ", edgelen);
}
force_eat(",");
int edges = iparse(0);
force_eat(")");
ld alpha = M_PI / edges;
ld c = asin_auto(sin_auto(edgelen/2) / sin(alpha));
hyperpoint h = xpush(c) * spin(M_PI - 2*alpha) * xpush0(c);
res = 2 * atan2(h);
if(real(res) < 0) res = -res;
while(real(res) > 2 * M_PI) res -= 2 * M_PI;
if(real(res) > M_PI) res = 2 * M_PI - res;
res = M_PI - res;
if(extra_params.count("angleofs"))
res -= extra_params["angleofs"];
if(extra_params.count("angleunit"))
res /= extra_params["angleunit"];
}
else if(eat("test(")) {
res = parsepar();
println(hlog, "res = ", make_pair(real(res), imag(res)));
}
else if(eat("ifp(")) {
cld cond = parse(0);