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more efficient hdist calculation

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Zeno Rogue 2018-02-27 19:21:43 +01:00
parent 429907e99e
commit c251f7cf30
1 changed files with 36 additions and 11 deletions
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43
hyperpoint.cpp
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@ -403,26 +403,51 @@ transmatrix inverse(const transmatrix& T) {
// distance between mh and 0
double hdist0(const hyperpoint& mh) {
if(sphere) {
switch(cgclass) {
case gcHyperbolic:
if(mh[2] < 1) return 0;
return acosh(mh[2]);
case gcEuclid: {
ld d = sqrt(mh[0]*mh[0]+mh[1]*mh[1]);
return d;
}
case gcSphere: {
ld res = mh[2] >= 1 ? 0 : mh[2] <= -1 ? M_PI : acos(mh[2]);
if(elliptic && res > M_PI/2) res = 2*M_PI-res;
if(elliptic && res > M_PI/2) res = M_PI-res;
return res;
}
if(!euclid && mh[2] > 1.5) return acosh(mh[2]);
ld d = sqrt(mh[0]*mh[0]+mh[1]*mh[1]);
if(euclid) return d;
return asinh(d);
default:
return 0;
}
}
ld circlelength(ld r) {
if(euclid) return 2 * M_PI * r;
else if(hyperbolic) return 2 * M_PI * sinh(r);
else return 2 * M_PI * sin(r);
switch(cgclass) {
case gcEuclid:
return 2 * M_PI * r;
case gcHyperbolic:
return 2 * M_PI * sinh(r);
case gcSphere:
return 2 * M_PI * sin(r);
default:
return 0;
}
}
// distance between two points
double hdist(const hyperpoint& h1, const hyperpoint& h2) {
return hdist0(gpushxto0(h1) * h2);
ld iv = intval(h1, h2);
switch(cgclass) {
case gcEuclid:
return sqrt(iv);
case gcHyperbolic:
return 2 * asinh(sqrt(iv) / 2);
case gcSphere:
return 2 * asin(sqrt(iv) / 2);
default:
return 0;
}
}
namespace hyperpoint_vec {