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Code Issues Releases Wiki Activity

cleanup of mercator_fix

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This commit is contained in:
Zeno Rogue 2019-08-14 18:58:42 +02:00
parent 9d573ebd07
commit 2c073c1ec1
3 changed files with 16 additions and 20 deletions
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31
drawing.cpp
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@ -718,8 +718,6 @@ void fixMercator(bool tinf) {
for(int i = 0; i<isize(glcoords); i++)
glcoords[i][mercator_coord] *= mercator_period / period_at(glcoords[i][1-mercator_coord]);
ld hperiod = mercator_period / 2;
mercator_coord = 0;
auto dist = [] (ld a, ld b) { return max(b, a-b); };
@ -737,10 +735,7 @@ void fixMercator(bool tinf) {
if(pmodel == mdBandEquiarea)
dmin = -vid.stretch * current_display->radius / M_PI, dmax = vid.stretch * current_display->radius / M_PI;
// for(int i = 0; i<isize(glcoords); i++) {
while(glcoords[0][mercator_coord] < hperiod) glcoords[0][mercator_coord] += mercator_period;
while(glcoords[0][mercator_coord] > hperiod) glcoords[0][mercator_coord] -= mercator_period;
// }
glcoords[0][mercator_coord] -= round_nearest(glcoords[0][mercator_coord], mercator_period);
ld first = glcoords[0][mercator_coord];
ld next = first;
@ -748,10 +743,7 @@ void fixMercator(bool tinf) {
ld mincoord = first, maxcoord = first;
for(int i = 0; i<isize(glcoords); i++) {
while(glcoords[i][mercator_coord] < next - hperiod)
glcoords[i][mercator_coord] += mercator_period;
while(glcoords[i][mercator_coord] > next + hperiod)
glcoords[i][mercator_coord] -= mercator_period;
glcoords[i][mercator_coord] -= round_nearest(glcoords[i][mercator_coord]-next, mercator_period);
next = glcoords[i][mercator_coord];
mincoord = min<ld>(mincoord, glcoords[i][mercator_coord]);
maxcoord = max<ld>(maxcoord, glcoords[i][mercator_coord]);
@ -762,14 +754,12 @@ void fixMercator(bool tinf) {
return;
}
ld last = first;
while(last < next - hperiod) last += mercator_period;
while(last > next + hperiod) last -= mercator_period;
ld last = first - round_nearest(first-next, mercator_period);
if(first == last) {
while(mincoord > cmin)
if(abs(first - last) < 1e-6) {
while(mincoord > cmin && mercator_loop_min > -100)
mercator_loop_min--, mincoord -= mercator_period;
while(maxcoord < cmax)
while(maxcoord < cmax && mercator_loop_max < +100)
mercator_loop_max++, maxcoord += mercator_period;
if(mdPseudocylindrical())
for(int i = 0; i<isize(glcoords); i++)
@ -787,10 +777,11 @@ void fixMercator(bool tinf) {
reverse(glcoords.begin(), glcoords.end());
swap(first, last);
}
while(maxcoord > cmin) {
for(int i=0; i<isize(glcoords); i++) glcoords[i][mercator_coord] -= mercator_period;
first -= mercator_period; last -= mercator_period;
mincoord -= mercator_period; maxcoord -= mercator_period;
int steps = floor((maxcoord - cmin) / mercator_period);
if(steps) {
for(int i=0; i<isize(glcoords); i++) glcoords[i][mercator_coord] -= mercator_period * steps;
first -= mercator_period * steps; last -= mercator_period * steps;
mincoord -= mercator_period * steps; maxcoord -= mercator_period * steps;
}
int base = isize(glcoords);
int minto = mincoord;

2
hyper.h
View File

@ -316,6 +316,8 @@ struct videopar {
ld eye;
bool auto_eye;
ld collignon_parameter; bool collignon_reflected;
};
extern videopar vid;

3
util.cpp
View File

@ -28,6 +28,9 @@ int SDL_GetTicks() {
EX long double sqr(long double x) { return x*x; }
EX ld round_nearest(ld x) { if(x > 0) return int(x+.5); else return -int(.5-x); }
EX ld round_nearest(ld x, ld multiple_of) { return multiple_of * round_nearest(x / multiple_of); }
EX int gcd(int i, int j) {
return i ? gcd(j%i, i) : j;
}