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improved the gnomonic projection of the sphere; there are still glitches with stereographic

This commit is contained in:
Zeno Rogue 2018-07-23 05:18:55 +02:00
parent 1c8aa41965
commit 2e7b5f0c16
1 changed files with 29 additions and 4 deletions
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33
polygons.cpp
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@ -146,12 +146,24 @@ void add1(const hyperpoint& H) {
int spherespecial, spherephase;
bool is_behind(const hyperpoint& H) {
return pmodel == mdDisk && vid.alpha + H[2] <= BEHIND_LIMIT;
}
hyperpoint be_just_on_view(const hyperpoint& H1, const hyperpoint &H2) {
using namespace hyperpoint_vec;
// H1[2] * t + H2[2] * (1-t) == BEHIND_LIMIT - vid.alpha
// H2[2]- BEHIND_LIMIT + vid.alpha = t * (H2[2] - H1[2])
ld t = (H2[2] - BEHIND_LIMIT + vid.alpha) / (H2[2] - H1[2]);
return H1 * t + H2 * (1-t);
}
void addpoint(const hyperpoint& H) {
if(true) {
hyperpoint Hscr;
applymodel(H, Hscr);
for(int i=0; i<3; i++) Hscr[i] *= vid.radius;
if(vid.alpha + H[2] <= BEHIND_LIMIT && pmodel == mdDisk) poly_flags |= POLY_BEHIND;
// if(vid.alpha + H[2] <= BEHIND_LIMIT && pmodel == mdDisk) poly_flags |= POLY_BEHIND;
if(spherespecial) {
double curnorm = H[0]*H[0]+H[1]*H[1]+H[2]*H[2];
@ -185,8 +197,20 @@ void coords_to_poly() {
}
void addpoly(const transmatrix& V, const vector<glvertex> &tab, int ofs, int cnt) {
for(int i=ofs; i<ofs+cnt; i++)
addpoint(V*glhr::gltopoint(tab[i]));
hyperpoint last = V * glhr::gltopoint(tab[ofs]);
bool last_behind = is_behind(last);
if(!last_behind) addpoint(last);
for(int i=ofs+1; i<ofs+cnt; i++) {
hyperpoint curr = V*glhr::gltopoint(tab[i]);
if(is_behind(curr) != last_behind) {
addpoint(be_just_on_view(last, curr));
last = curr; last_behind = !last_behind;
}
else {
if(!last_behind) addpoint(curr);
last = curr;
}
}
}
#if CAP_SDLGFX
@ -622,6 +646,8 @@ void drawpolyline(polytodraw& p) {
p.col = 0; */
addpoly(pp.V, *pp.tab, pp.offset, pp.cnt);
// if(poly_flags & POLY_BEHIND) return;
if(isize(glcoords) <= 1) return;
mercator_loop_min = mercator_loop_max = 0;
if(sphere && mdBandAny())
@ -629,7 +655,6 @@ void drawpolyline(polytodraw& p) {
int poly_limit = max(vid.xres, vid.yres) * 2;
if(poly_flags & POLY_BEHIND) return;
if(0) for(auto& p: glcoords) {
if(abs(p[0]) > poly_limit || abs(p[1]) > poly_limit)