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stretch factor in cylindrical equidistant and cylindrical equi-area models

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This commit is contained in:
Zeno Rogue 2018-07-30 17:44:11 +02:00
parent c252f1f09c
commit e27cd9b654
6 changed files with 73 additions and 39 deletions
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1
config.cpp
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@ -254,6 +254,7 @@ void initConfig() {
addsaverenum(stereo::mode, "stereo-mode");
addsaver(vid.euclid_to_sphere, "euclid to sphere projection", 1.5);
addsaver(vid.twopoint_param, "twopoint parameter", 1);
addsaver(vid.stretch, "stretch", 1);
addsaver(gp::on, "goldberg", false);
addsaver(gp::param.first, "goldberg-x", gp::param.first);

8
conformal.cpp
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@ -640,6 +640,10 @@ namespace conformal {
if(pmodel == mdTwoPoint) {
dialog::addSelItem(XLAT("parameter"), fts3(vid.twopoint_param), 'l');
}
if(among(pmodel, mdBandEquidistant, mdBandEquiarea)) {
dialog::addSelItem(XLAT("parameter"), fts3(vid.stretch), 'l');
}
dialog::addBreak(100);
dialog::addItem(XLAT("history mode"), 'a');
@ -685,6 +689,10 @@ namespace conformal {
#endif
else if(uni == 'l' && pmodel == mdHalfplane)
lower_halfplane = !lower_halfplane;
else if(uni == 'l' && among(pmodel, mdBandEquiarea, mdBandEquidistant))
dialog::editNumber(vid.stretch, 0, 10, .1, 1, XLAT("parameter"),
"Vertical stretch factor."
);
else if(uni == 'a')
pushScreen(history_menu);
else if(uni == 'l' && pmodel == mdHemisphere && euclid) {

5
dialogs.cpp
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@ -748,6 +748,11 @@ namespace dialog {
addSelItem("generation range bonus", its(genrange_bonus), 'o');
addSelItem("game range bonus", its(gamerange_bonus), 'O');
}
if(ne.editwhat == &vid.stretch && sphere && pmodel == mdBandEquiarea) {
addBoolItem("Gall-Peters", vid.stretch == 2, 'o');
add_action([] { vid.stretch = 2; });
}
if(ne.editwhat == &vid.linewidth)
addBoolItem("finer lines at the boundary", vid.antialias & AA_LINEWIDTH, 'o');

2
hyper.h
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@ -806,7 +806,7 @@ extern reaction_t help_delegate;
struct videopar {
ld scale, alpha, sspeed, mspeed, yshift, camera_angle;
ld ballangle, ballproj, euclid_to_sphere, twopoint_param;
ld ballangle, ballproj, euclid_to_sphere, twopoint_param, stretch;
int mobilecompasssize;
int aurastr, aurasmoothen;

88
hypgraph.cpp
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@ -276,44 +276,62 @@ void applymodel(hyperpoint H, hyperpoint& ret) {
else if(H[2] < 0 && x <= 0) x = -M_PI - x;
}
hypot_zlev(zlev_used, y, zlev, yf, zf);
if(pmodel == mdTwoPoint) {
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;
switch(pmodel) {
case mdTwoPoint: {
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);
break;
}
case mdBand: {
switch(cgclass) {
case gcSphere:
y = atanh(sin(y));
x *= 2; y *= 2;
break;
case gcHyperbolic:
y = 2 * atan(tanh(y/2));
x *= 2; y *= 2;
break;
case gcEuclid:
// y = y;
y *= 2; x *= 2;
break;
}
break;
}
case mdBandEquiarea: {
y = sin_auto(y) * vid.stretch;
break;
}
case mdSinusoidal: {
x *= cos_auto(y);
break;
}
case mdBandEquidistant: {
y *= vid.stretch;
break;
}
default: {
printf("unknown model\n");
}
x = (dright*dright-dleft*dleft) / 4 / p;
y = (y>0?1:-1) * sqrt(dleft * dleft - (x-p)*(x-p) + 1e-9);
}
else if(pmodel == mdBand) switch(cgclass) {
case gcSphere:
y = atanh(sin(y));
x *= 2; y *= 2;
break;
case gcHyperbolic:
y = 2 * atan(tanh(y/2));
x *= 2; y *= 2;
break;
case gcEuclid:
// y = y;
y *= 2; x *= 2;
break;
}
else if(pmodel == mdBandEquiarea)
y = sin_auto(y);
else if(pmodel == mdSinusoidal)
x *= cos_auto(y);
ret = hpxyz(x / M_PI, y * yf / M_PI, 0);
if(zlev_used && stereo::active())
apply_depth(ret, y * zf / M_PI);

8
polygons.cpp
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@ -451,7 +451,7 @@ void fixMercator(bool tinf) {
if(pmodel == mdSinusoidal)
for(int i = 0; i<isize(glcoords); i++)
glcoords[i][mercator_coord] /= cos(glcoords[i][1] / vid.radius * M_PI);
glcoords[i][mercator_coord] /= cos(glcoords[i][1] / vid.radius * M_PI);
ld hperiod = mercator_period / 2;
@ -459,10 +459,12 @@ void fixMercator(bool tinf) {
ld cmin = -vid.xcenter, cmax = vid.xres - vid.xcenter, dmin = -vid.ycenter, dmax = vid.yres - vid.ycenter;
if(mercator_coord)
swap(cmin, dmin), swap(cmax, dmax);
if(pmodel == mdSinusoidal || pmodel == mdBandEquidistant)
if(pmodel == mdSinusoidal)
dmin = -vid.radius / 2, dmax = vid.radius / 2;
if(pmodel == mdBandEquidistant)
dmin = -vid.stretch * vid.radius / 2, dmax = vid.stretch * vid.radius / 2;
if(pmodel == mdBandEquiarea)
dmin = -vid.radius / M_PI, dmax = vid.radius / M_PI;
dmin = -vid.stretch * vid.radius / M_PI, dmax = vid.stretch * vid.radius / M_PI;
for(int i = 0; i<isize(glcoords); i++) {
while(glcoords[0][mercator_coord] < hperiod) glcoords[0][mercator_coord] += mercator_period;