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Code Issues Releases Wiki Activity

improvements in the two-point model on the sphere

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Zeno Rogue
2018-04-21 12:18:33 +02:00
parent abbf536466
commit 323893094f
4 changed files with 104 additions and 39 deletions
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17
hypgraph.cpp
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@@ -123,6 +123,8 @@ bool hypot_zlev(bool zlev_used, ld& d, ld zlev, ld& df, ld& zf) {
return hypot_zlev(zlev_used, d, zlev, df, zf, z);
}
int twopoint_sphere_flips;
bool twopoint_do_flips;
void applymodel(hyperpoint H, hyperpoint& ret) {
@@ -266,7 +268,7 @@ void applymodel(hyperpoint H, hyperpoint& ret) {
else {
ld x, y, yf, zf;
y = asin_auto(H[1]);
x = asin_auto(H[0] / cos_auto(y));
x = asin_auto_clamp(H[0] / cos_auto(y));
if(sphere) {
if(H[2] < 0 && x > 0) x = M_PI - x;
else if(H[2] < 0 && x <= 0) x = -M_PI - x;
@@ -276,6 +278,19 @@ void applymodel(hyperpoint H, hyperpoint& ret) {
auto p = vid.twopoint_param;
ld dleft = hypot_auto(x-p, y);
ld dright = hypot_auto(x+p, y);
if(sphere) {
int tss = twopoint_sphere_flips;
if(tss&1) { tss--;
dleft = 2*M_PI - 2*p - dleft;
dright = 2*M_PI - 2*p - dright;
swap(dleft, dright);
y = -y;
}
while(tss) { tss -= 2;
dleft = 2*M_PI - 4*p + dleft;
dright = 2*M_PI - 4*p + dright;
}
}
x = (dright*dright-dleft*dleft) / 4 / p;
y = (y>0?1:-1) * sqrt(dleft * dleft - (x-p)*(x-p) + 1e-9);
}