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refactored find_on_screen into pointable() and minimize_point_value

This commit is contained in:
Zeno Rogue 2020-12-30 04:13:47 +01:00
parent 0520eb132c
commit d73b9f36cd
1 changed files with 24 additions and 17 deletions
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41
hypgraph.cpp
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@ -89,36 +89,43 @@ EX hyperpoint space_to_perspective(hyperpoint z, ld alpha IS(pconf.alpha)) {
return z;
}
EX shiftpoint find_on_screen(hyperpoint hxy, shiftpoint hint) {
shiftmatrix T = rgpushxto0(hint);
EX hyperpoint pointable() {
return WDIM == 2 && GDIM == 3 ? zpush0(cgi.FLOOR) : C0;
}
hyperpoint rel = WDIM == 2 && GDIM == 3 ? zpush0(cgi.FLOOR) : C0;
/** find a shiftpoint which minimizes value -- we represent points by matrices to make things a bit simpler */
EX shiftmatrix minimize_point_value(shiftmatrix T, function<ld(const shiftmatrix&)> value) {
auto distance_at = [&] (const shiftmatrix& T1) {
hyperpoint h1;
applymodel(T1*rel, h1);
return sqhypot_d(2, hxy - h1);
};
ld best = distance_at(T);
ld best = value(T);
for(int it=0; it<50; it++)
for(int s=0; s<4; s++) {
shiftmatrix T1 = T * spin(s * quarter_circle) * xpush(pow(1.2, -it));
ld dist = distance_at(T1);
ld dist = value(T1);
if(dist < best) best = dist, T = T1;
if(mdBandAny()) {
T1.shift += 2 * M_PI;
dist = distance_at(T1);
dist = value(T1);
if(dist < best) best = dist, T = T1;
T1.shift -= 4 * M_PI;
dist = distance_at(T1);
dist = value(T1);
if(dist < best) best = dist, T = T1;
T1.shift += 2 * M_PI;
}
}
return T*rel;
return T;
}
EX shiftpoint find_on_screen(hyperpoint hxy, const shiftmatrix& T) {
hyperpoint rel = pointable();
auto distance_at = [&] (const shiftmatrix& T1) {
hyperpoint h1;
applymodel(T1*rel, h1);
return sqhypot_d(2, hxy - h1);
};
return minimize_point_value(T, distance_at) * rel;
}
EX shiftpoint gethyper(ld x, ld y) {
@ -128,12 +135,12 @@ EX shiftpoint gethyper(ld x, ld y) {
hyperpoint hxy = point3(hx, hy, 0);
if(WDIM == 2 && GDIM == 3) {
return mouseover ? find_on_screen(hxy, ggmatrix(mouseover) * C0) : shiftless(Hypc);
return mouseover ? find_on_screen(hxy, ggmatrix(mouseover)): shiftless(Hypc);
}
if(pmodel) {
ghxy = hxy;
return find_on_screen(hxy, ghpm);
return find_on_screen(hxy, rgpushxto0(ghpm));
}
if(pconf.camera_angle) camrotate(hx, hy);