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Code Issues Releases Wiki Activity

rogueviz:: projection visualizations have slides

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Zeno Rogue
2021-04-07 18:01:03 +02:00
parent 57d7663650
commit 02da8e78ec
3 changed files with 98 additions and 5 deletions
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42
rogueviz/hyperbolic-analogs.cpp
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@@ -417,7 +417,47 @@ auto msc = arg::add3("-analogs", enable)
->editable(0, 255, 15, "Earth transparency", "", 't');
param_b(textured, "analogs_texture")
->editable("draw Earth", 'T');
});
})
+ addHook(rogueviz::pres::hooks_build_rvtour, 131, [] (string s, vector<tour::slide>& v) {
if(s != "mixed") return;
using namespace tour;
v.push_back(slide{
"projections/Earth and the hyperbolic plane", 10, LEGAL::NONE | QUICKGEO,
"Cartographers need to project the surface of Earth to a flat paper. However, since the surface of Earth is curved, there is no perfect way to do this. "
"Some projections will be conformal (map angles and small shapes faithfully), equidistant (map distances along SOME lines faithfully), equal-area (map areas proportionally), etc., "
"but no map will be all at once. Cartographers use many projections.\n\n"
"We need these projections because the Earth has positive curvature, while the paper has no curvature. Interestingly, "
"most of the popular projections can be generalized, as projections from surface of curvature any K1 to surfaces of any curvature K2!\n\n"
"This slide focuses on the hyperbolic analogs of popular spherical projections (projecting H² to E²). "
"Press '5' to enable cycling between different projections, or 'o' for more options."
,
[] (presmode mode) {
slide_url(mode, 'y', "YouTube link (with description)", "https://youtu.be/H7NKhKTjHVE");
slide_url(mode, 'm', "HyperRogue page about projections", "http://www.roguetemple.com/z/hyper/models.php");
setCanvas(mode, '0');
if(mode == pmStart) {
enable();
start_game();
slide_backup(cycle_models);
slide_backup(anims::period);
}
if(mode == pmStop) {
dual::disable();
start_game();
}
if(mode == pmKey) {
cycle_models = !cycle_models;
if(cycle_models) anims::period *= 12;
else anims::period /= 12;
}
}});
callhooks(rogueviz::pres::hooks_build_rvtour, "projections", v);
});
}
}