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stretch factor in cylindrical equidistant and cylindrical equi-area models

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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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polygons.cpp
+5 -3
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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;