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planet.c
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planet.c
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/* planet.c */
/* planet generating program */
/* Copyright 1988--present Torben AE. Mogensen */
char version[] = "August 14 2024";
/* The program generates planet maps based on recursive spatial subdivision */
/* of a tetrahedron containing the globe. The output is a colour BMP bitmap. */
/* with options for PPM or B/W bitmaps */
/* The colours may optionally be modified according to latitude to move the */
/* icecaps lower closer to the poles, with a corresponding change in land colours. */
/* The Mercator map at magnification 1 is scaled to fit the Width */
/* it uses the full height (it could extend infinitely) */
/* The orthographic projections are scaled so the full view would use the */
/* full Height. Areas outside the globe are coloured black. */
/* Stereographic and gnomonic projections use the same scale as orthographic */
/* in the center of the picture, but distorts scale away from the center. */
/* It is assumed that pixels are square */
/* I have included procedures to print the maps as bmp (Windows) or */
/* ppm(portable pixel map) bitmaps on standard output or specified files. */
/* I have tried to avoid using machine specific features, so it should */
/* be easy to port the program to any machine. Beware, though that due */
/* to different precision on different machines, the same seed numbers */
/* can yield very different planets. */
/* The primitive user interface is primarily a result of portability concerns */
#include <stdio.h>
#include <errno.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#ifdef THINK_C
#define macintosh 1
#endif
#ifdef macintosh
#include <console.h>
#include <unix.h>
#endif
#ifdef WIN32
#include <io.h>
#undef min
#undef max
#define O_BINARY 0x8000
#elif _WIN32
#include <io.h>
#undef min
#undef max
#define O_BINARY 0x8000
#endif
int BLACK = 0;
int WHITE = 1;
int BACK = 2;
int GRID = 3;
int OUTLINE1 = 4;
int OUTLINE2 = 5;
int LOWEST = 6;
int SEA = 7;
int LAND = 8;
int HIGHEST = 9;
int nonLinear = 0;
char view;
int nocols = 65536;
int rtable[65536], gtable[65536], btable[65536];
/* Supported output file types:
BMP - Windows Bit MaPs
PPM - Portable Pix Maps
XPM - X-windows Pix Maps
*/
double log_2(x)
double x;
{ return(log(x)/log(2.0)); }
typedef enum ftype
{
bmp,
ppm,
xpm,
heightfield
}
ftype;
ftype file_type = bmp;
char* file_ext(ftype file_type)
{
switch (file_type)
{
case bmp:
return (".bmp");
case ppm:
return (".ppm");
case xpm:
return (".xpm");
case heightfield:
return (".heightfield");
default:
return ("");
}
}
/* Character table for XPM output */
char letters[64] = {
'@','$','.',',',':',';','-','+','=','#','*','&','A','B','C','D',
'E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T',
'U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j',
'k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
/* T = tundra, G = grasslands, B = Taiga / boreal forest, D = desert,
S = savanna, F = temperate forest, R = temperate rainforest,
W = Xeric shrubland and dry forest, E = tropical dry forest,
O = tropical rainforest, I = icecap */
/* Whittaker diagram */
char biomes[45][45] = {
"IIITTTTTGGGGGGGGDDDDDDDDDDDDDDDDDDDDDDDDDDDDD",
"IIITTTTTGGGGGGGGDDDDGGDSDDSDDDDDDDDDDDDDDDDDD",
"IITTTTTTTTTBGGGGGGGGGGGSSSSSSDDDDDDDDDDDDDDDD",
"IITTTTTTTTBBBBBBGGGGGGGSSSSSSSSSWWWWWWWDDDDDD",
"IITTTTTTTTBBBBBBGGGGGGGSSSSSSSSSSWWWWWWWWWWDD",
"IIITTTTTTTBBBBBBFGGGGGGSSSSSSSSSSSWWWWWWWWWWW",
"IIIITTTTTTBBBBBBFFGGGGGSSSSSSSSSSSWWWWWWWWWWW",
"IIIIITTTTTBBBBBBFFFFGGGSSSSSSSSSSSWWWWWWWWWWW",
"IIIIITTTTTBBBBBBBFFFFGGGSSSSSSSSSSSWWWWWWWWWW",
"IIIIIITTTTBBBBBBBFFFFFFGGGSSSSSSSSWWWWWWWWWWW",
"IIIIIIITTTBBBBBBBFFFFFFFFGGGSSSSSSWWWWWWWWWWW",
"IIIIIIIITTBBBBBBBFFFFFFFFFFGGSSSSSWWWWWWWWWWW",
"IIIIIIIIITBBBBBBBFFFFFFFFFFFFFSSSSWWWWWWWWWWW",
"IIIIIIIIIITBBBBBBFFFFFFFFFFFFFFFSSEEEWWWWWWWW",
"IIIIIIIIIITBBBBBBFFFFFFFFFFFFFFFFFFEEEEEEWWWW",
"IIIIIIIIIIIBBBBBBFFFFFFFFFFFFFFFFFFEEEEEEEEWW",
"IIIIIIIIIIIBBBBBBRFFFFFFFFFFFFFFFFFEEEEEEEEEE",
"IIIIIIIIIIIIBBBBBBRFFFFFFFFFFFFFFFFEEEEEEEEEE",
"IIIIIIIIIIIIIBBBBBRRRFFFFFFFFFFFFFFEEEEEEEEEE",
"IIIIIIIIIIIIIIIBBBRRRRRFFFFFFFFFFFFEEEEEEEEEE",
"IIIIIIIIIIIIIIIIIBRRRRRRRFFFFFFFFFFEEEEEEEEEE",
"IIIIIIIIIIIIIIIIIRRRRRRRRRRFFFFFFFFEEEEEEEEEE",
"IIIIIIIIIIIIIIIIIIRRRRRRRRRRRRFFFFFEEEEEEEEEE",
"IIIIIIIIIIIIIIIIIIIRRRRRRRRRRRRRFRREEEEEEEEEE",
"IIIIIIIIIIIIIIIIIIIIIRRRRRRRRRRRRRRRREEEEEEEE",
"IIIIIIIIIIIIIIIIIIIIIIIRRRRRRRRRRRRRROOEEEEEE",
"IIIIIIIIIIIIIIIIIIIIIIIIRRRRRRRRRRRROOOOOEEEE",
"IIIIIIIIIIIIIIIIIIIIIIIIIIRRRRRRRRRROOOOOOEEE",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIRRRRRRRRROOOOOOOEE",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIRRRRRRRROOOOOOOEE",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIRRRRRRROOOOOOOOE",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIRRRRROOOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIRROOOOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIROOOOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIROOOOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOO",
"IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIOOOOOOO"
};
#define PI 3.14159265358979323846
#define DEG2RAD 0.01745329251994329576923 /* pi/180 */
/* these three values can be changed to change world characteristica */
double M = -.02; /* initial altitude (slightly below sea level) */
double dd1 = 0.45; /* weight for altitude difference */
double POWA = 1.0; /* power for altitude difference */
double dd2 = 0.035; /* weight for distance */
double POW = 0.47; /* power for distance function */
int Depth; /* depth of subdivisions */
double r1,r2,r3,r4; /* seeds */
double longi,lat,scale;
double vgrid, hgrid;
int latic = 0; /* flag for latitude based colour */
int Width = 800, Height = 600; /* default map size */
unsigned short **col; /* colour array */
int **heights; /* heightfield array */
double **xxx, **yyy, **zzz; /* x,y,z arrays (used for gridlines */
int cl0[1000][1000]; /* match map */
int MatchWidth = 48, MatchHeight = 24;
int do_outline = 0; /* if 1, draw coastal outline */
int do_bw = 0; /* if 1, reduce map to black outline on white */
int contourLines = 0; /* if >0, # of contour lines */
int coastContourLines = 0; /* if >0, # of coastal contour lines */
int *outx, *outy;
int doshade = 0;
int shade;
unsigned short **shades; /* shade array */
double shade_angle = 150.0; /* angle of "light" on bumpmap */
double shade_angle2 = 20.0; /* with daylight shading, these two are
longitude/latitude */
double cla, sla, clo, slo, rseed;
int temperature = 0; /* if 1, show temperatures based on latitude
and altitude*/
double tempMin = 1000.0, tempMax = -1000.0;
int rainfall = 0; /* if 1, calculate rainfall based on latitude
and temperature */
double rainMin = 1000.0, rainMax = -1000.0;
double rainShadow = 0.0; /* approximate rain shadow */
int makeBiomes = 0; /* if 1, make biome map */
int matchMap = 0;
double matchSize = 0.1;
typedef struct Vertex
{
double h; /* altitude */
double s; /* seed */
double x,y,z; /* coordinates */
double shadow; /* approximate rain shadow */
} vertex;
/* distance squared between vertices */
double dist2(vertex a, vertex b)
{
double abx, aby, abz;
abx = a.x-b.x; aby = a.y-b.y; abz = a.z-b.z;
return abx*abx+aby*aby+abz*abz;
}
/* For the vertices of the tetrahedron */
vertex tetra[4];
double rotate1 = 0.0, rotate2 = 0.0;
double cR1, sR1, cR2, sR2;
char cmdLine[1000]; /* command line info */
int min(x,y)
int x,y;
{ return(x<y ? x : y); }
int max(x,y)
int x,y;
{ return(x<y ? y : x); }
double fmin(x,y)
double x,y;
{ return(x<y ? x : y); }
double fmax(x,y)
double x,y;
{ return(x<y ? y : x); }
int main(ac,av)
int ac;
char **av;
{
void printppm(), printppmBW(), printbmp(), printbmpBW(),
printxpm(), printxpmBW(), printheights(), print_error(), reportError(char c);
void mercator(), peter(), squarep(), mollweide(), sinusoid(), stereo(),
orthographic(), gnomonic(), icosahedral(), azimuth(), conical();
int i;
double rand2(), planet1();
void readcolors();
void readmap(), makeoutline(), smoothshades();
FILE *outfile, *colfile = NULL;
char filename[256] = "planet-map";
char colorsname[256] = "Olsson.col";
char biocolorsname[256] = "default.bio";
int do_file = 0, tmp = 0;
double tx, ty, tz;
/* initialize vertices to slightly irregular tetrahedron */
tetra[0].x = -sqrt(3.0)-0.20;
tetra[0].y = -sqrt(3.0)-0.22;
tetra[0].z = -sqrt(3.0)-0.23;
tetra[1].x = -sqrt(3.0)-0.19;
tetra[1].y = sqrt(3.0)+0.18;
tetra[1].z = sqrt(3.0)+0.17;
tetra[2].x = sqrt(3.0)+0.21;
tetra[2].y = -sqrt(3.0)-0.24;
tetra[2].z = sqrt(3.0)+0.15;
tetra[3].x = sqrt(3.0)+0.24;
tetra[3].y = sqrt(3.0)+0.22;
tetra[3].z = -sqrt(3.0)-0.25;
#ifdef macintosh
_ftype = 'TEXT';
_fcreator ='ttxt';
ac = ccommand (&av);
do_file = 1;
#endif
longi = 0.0;
lat = 0.0;
scale = 1.0;
rseed = 0.123;
view = 'm';
vgrid = hgrid = 0.0;
outfile = stdout;
#ifdef WIN32
_setmode(fileno(outfile), O_BINARY);
#elif _WIN32
_setmode(fileno(outfile), O_BINARY);
#endif
strcpy(cmdLine,"");
for (i = 0; i<ac; i++) {
strcat(cmdLine,av[i]);
strcat(cmdLine," ");
}
for (i = 1; i<ac; i++) {
if (av[i][0] == '-') {
switch (av[i][1]) {
case 'V' : if (++i < ac && sscanf(av[i],"%lf",&dd2)) break;
reportError('V');
case 'v' : if (++i < ac && sscanf(av[i],"%lf",&dd1)) break;
reportError('v');
case 's' : if (++i < ac && sscanf(av[i],"%lf",&rseed)) break;
reportError('s');
case 'w' : if (++i < ac && sscanf(av[i],"%d",&Width)) break;
reportError('w');
case 'h' : if (++i < ac && sscanf(av[i],"%d",&Height)) break;
reportError('h');
case 'm' : if (++i < ac && sscanf(av[i],"%lf",&scale)) {
if (scale < 0.1) scale = 0.1;
break;
}
reportError('m');
case 'o' : if (++i < ac && sscanf(av[i],"%255[^\n]",filename)) {
do_file = 1;
break;
}
reportError('o');
case 'x' : file_type =xpm;
break;
case 'R' : fprintf(stderr, "Version: %s\n", version);
break;
case 'C' : if (++i < ac && sscanf(av[i],"%255[^\n]",colorsname)) break;
reportError('C');
case 'Z' : if (++i < ac && sscanf(av[i],"%255[^\n]",biocolorsname)) break;
reportError('Z');
case 'l' : if (++i < ac && sscanf(av[i],"%lf",&longi)) {
while (longi<-180) longi += 360;
while (longi>180) longi -= 360;
break;
}
reportError('l');
case 'L' : if (++i < ac && sscanf(av[i],"%lf",&lat)) {
if (lat<-90) lat = -90;
if (lat>90) lat = 90;
break;
}
reportError('L');
case 'g' : if (++i < ac && sscanf(av[i],"%lf",&vgrid)) break;
reportError('g');
case 'G' : if (++i < ac && sscanf(av[i],"%lf",&hgrid)) break;
reportError('G');
case 'c' : latic += 1;
break;
case 'S' : dd1 /= 2.0; POWA = 0.75;
break;
case 'n' : nonLinear = 1;
break;
case 'O' : do_outline = 1;
do_bw = 1;
if (strlen(av[i])>2) {
sscanf(av[i],"-O%d",&tmp);
if (tmp < 0) coastContourLines = -tmp;
else contourLines = tmp;
}
break;
case 'E' : do_outline = 1;
if (strlen(av[i])>2) {
sscanf(av[i],"-E%d",&tmp);
if (tmp < 0) coastContourLines = -tmp;
else contourLines = tmp;
}
break;
case 'B' : doshade = 1; /* bump map */
break;
case 'b' : doshade = 2; /* bump map on land only */
break;
case 'd' : doshade = 3; /* daylight shading */
break;
case 'P' : file_type = ppm;
break;
case 'H' : file_type = heightfield;
break;
case 'M' : if (i+1 < ac && sscanf(av[i+1],"%lf",&matchSize)) i++;
else matchSize = 0.1;
matchMap = 1;
break;
case 'a' : if (++i < ac && sscanf(av[i],"%lf",&shade_angle)) break;
reportError('a');
case 'A' : if (++i < ac && sscanf(av[i],"%lf",&shade_angle2)) break;
reportError('A');
case 'i' : if (++i < ac && sscanf(av[i],"%lf",&M)) break;
reportError('i');
case 'T' : if (++i < ac && sscanf(av[i]," %lf",&rotate2))
if (++i < ac && sscanf(av[i]," %lf",&rotate1)) {
while (rotate1<-180) rotate1 += 360;
while (rotate1>180) rotate1 -= 360;
while (rotate2<-180) rotate2 += 360;
while (rotate2>180) rotate2 += 360;
break;
}
reportError('T');
case 't' : temperature = 1; break;
case 'r' : rainfall = 1; break;
case 'z' : makeBiomes = 1; break;
case 'p' : if (strlen(av[i])>2) view = av[i][2];
else if (++i < ac) view = av[i][0]; else view = ' ';
switch (view) {
case 'm' :
case 'p' :
case 'q' :
case 's' :
case 'o' :
case 'g' :
case 'a' :
case 'c' :
case 'M' :
case 'S' :
case 'i' : break;
case 'h' : file_type = heightfield; break;
default: fprintf(stderr,"Unknown projection: %s\n",av[i]);
print_error();
}
break;
default: fprintf(stderr,"Unknown option: %s\n",av[i]);
print_error();
}
}
else {
fprintf(stderr,"Unknown option: %s\n\n",av[i]);
print_error();
}
}
readcolors(colfile, colorsname, biocolorsname);
#ifdef macintosh
switch (file_type)
{
case bmp:
_ftype = 'BMPf';
break;
case ppm:
_ftype = 'PPGM';
break;
case xpm:
_ftype = 'TEXT';
break;
}
_fcreator ='GKON';
#endif
if (do_file &&'\0' != filename[0]) {
if (strchr (filename, '.') == 0)
strcpy(&(filename[strlen(filename)]), file_ext(file_type));
outfile = fopen(filename,"wb");
#ifdef macintosh
_ftype = 'TEXT';
_fcreator ='ttxt';
#endif
if (outfile == NULL) {
fprintf(stderr,
"Could not open output file %s, error code = %d\n",
filename, errno);
exit(0);
}
}
else {
outfile = stdout;
#ifdef WIN32
setmode(fileno(outfile), O_BINARY);
#elif _WIN32
setmode(fileno(outfile), O_BINARY);
#endif
}
longi = longi*DEG2RAD;
lat = lat*DEG2RAD;
sla = sin(lat); cla = cos(lat);
slo = sin(longi); clo = cos(longi);
rotate1 = -rotate1*DEG2RAD;
rotate2 = -rotate2*DEG2RAD;
sR1 = sin(rotate1); cR1 = cos(rotate1);
sR2 = sin(rotate2); cR2 = cos(rotate2);
for (i=0; i<4; i++) { /* rotate around y axis */
tx = tetra[i].x;
ty = tetra[i].y;
tz = tetra[i].z;
tetra[i].x = cR2*tx + sR2*tz;
tetra[i].y = ty ;
tetra[i].z = -sR2*tx + cR2*tz;
}
for (i=0; i<4; i++) { /* rotate around x axis */
tx = tetra[i].x;
ty = tetra[i].y;
tz = tetra[i].z;
tetra[i].x = tx;
tetra[i].y = cR1*ty - sR1*tz ;
tetra[i].z = sR1*ty + cR1*tz;
}
if (matchMap) readmap();
if (file_type == heightfield) {
heights = (int**)calloc(Width,sizeof(int*));
if (heights == 0) {
fprintf(stderr, "Memory allocation failed.");
exit(1);
}
for (i=0; i<Width; i++) {
heights[i] = (int*)calloc(Height,sizeof(int));
if (heights[i] == 0) {
fprintf(stderr,
"Memory allocation failed at %d out of %d heights\n",
i+1,Width);
exit(1);
}
}
}
col = (unsigned short**)calloc(Width,sizeof(unsigned short*));
if (col == 0) {
fprintf(stderr, "Memory allocation failed.");
exit(1);
}
for (i=0; i<Width; i++) {
col[i] = (unsigned short*)calloc(Height,sizeof(unsigned short));
if (col[i] == 0) {
fprintf(stderr,
"Memory allocation failed at %d out of %d cols\n",
i+1,Width);
exit(1);
}
}
if (doshade>0) {
shades = (unsigned short**)calloc(Width,sizeof(unsigned short*));
if (shades == 0) {
fprintf(stderr, "Memory allocation failed.");
exit(1);
}
for (i=0; i<Width; i++) {
shades[i] = (unsigned short*)calloc(Height,sizeof(unsigned short));
if (shades[i] == 0) {
fprintf(stderr,
"Memory allocation failed at %d out of %d shades\n",
i,Width);
exit(1);
}
}
}
if (vgrid != 0.0) {
xxx = (double**)calloc(Width,sizeof(double*));
if (xxx == 0) {
fprintf(stderr, "Memory allocation failed xxx.");
exit(1);
}
for (i=0; i<Width; i++) {
xxx[i] = (double*)calloc(Height,sizeof(double));
if (xxx[i] == 0) {
fprintf(stderr,
"Memory allocation failed at %d out of %d xxx\n",
i+1,Width);
exit(1);
}
}
zzz = (double**)calloc(Width,sizeof(double*));
if (zzz == 0) {
fprintf(stderr, "Memory allocation failed zzz.");
exit(1);
}
for (i=0; i<Width; i++) {
zzz[i] = (double*)calloc(Height,sizeof(double));
if (zzz[i] == 0) {
fprintf(stderr,
"Memory allocation failed at %d out of %d zzz\n",
i+1,Width);
exit(1);
}
}
}
if (hgrid != 0.0 || vgrid != 0.0) {
yyy = (double**)calloc(Width,sizeof(double*));
if (yyy == 0) {
fprintf(stderr, "Memory allocation failed yyy.");
exit(1);
}
for (i=0; i<Width; i++) {
yyy[i] = (double*)calloc(Height,sizeof(double));
if (yyy[i] == 0) {
fprintf(stderr,
"Memory allocation failed at %d out of %d yyy\n",
i+1,Width);
exit(1);
}
}
}
if (view == 'c' || view == 'm') {
if (lat == 0) view = 'm';
/* Conical approaches mercator when lat -> 0 */
if (fabs(lat) >= PI - 0.000001) view = 's';
/* Conical approaches stereo when lat -> +/- 90 */
/* Also to avoid division by 0 for Mercator when lat -> +/- 90 */
}
Depth = 3*((int)(log_2(scale*Height)))+6;
r1 = rseed;
r1 = rand2(r1,r1);
r2 = rand2(r1,r1);
r3 = rand2(r1,r2);
r4 = rand2(r2,r3);
tetra[0].s = r1;
tetra[1].s = r2;
tetra[2].s = r3;
tetra[3].s = r4;
tetra[0].h = M;
tetra[1].h = M;
tetra[2].h = M;
tetra[3].h = M;
tetra[0].shadow = 0.0;
tetra[1].shadow = 0.0;
tetra[2].shadow = 0.0;
tetra[3].shadow = 0.0;
switch (view) {
case 'm': /* Mercator projection */
mercator();
break;
case 'p': /* Peters projection (area preserving cylindrical) */
peter();
break;
case 'q': /* Square projection (equidistant latitudes) */
squarep();
break;
case 'M': /* Mollweide projection (area preserving) */
mollweide();
break;
case 'S': /* Sinusoid projection (area preserving) */
sinusoid();
break;
case 's': /* Stereographic projection */
stereo();
break;
case 'o': /* Orthographic projection */
orthographic();
break;
case 'g': /* Gnomonic projection */
gnomonic();
break;
case 'i': /* Icosahedral projection */
icosahedral();
break;
case 'a': /* Area preserving azimuthal projection */
azimuth();
break;
case 'c': /* Conical projection (conformal) */
conical();
break;
case 'h': /* heightfield (obsolete) */
orthographic();
break;
}
if (do_outline) makeoutline(do_bw);
if (vgrid != 0.0) { /* draw longitudes */
int i,j;
for (i=0; i<Width-1; i++)
for (j=0; j<Height-1; j++) {
double t;
int g = 0;
if (fabs(yyy[i][j])==1.0) g=1;
else {
t = floor((atan2(xxx[i][j],zzz[i][j])*180/PI+360)/vgrid);
if (t != floor((atan2(xxx[i+1][j],zzz[i+1][j])*180/PI+360)/vgrid))
g=1;
if (t != floor((atan2(xxx[i][j+1],zzz[i][j+1])*180/PI+360)/vgrid))
g=1;
}
if (g) {
if (do_bw) col[i][j] = 0; else col[i][j] = GRID;
if (doshade>0) shades[i][j] = 255;
}
}
}
if (hgrid != 0.0) { /* draw latitudes */
int i,j;
for (i=0; i<Width-1; i++)
for (j=0; j<Height-1; j++) {
double t;
int g = 0;
t = floor((asin(yyy[i][j])*180/PI+360)/hgrid);
if (t != floor((asin(yyy[i+1][j])*180/PI+360)/hgrid))
g=1;
if (t != floor((asin(yyy[i][j+1])*180/PI+360)/hgrid))
g=1;
if (g) {
if (do_bw) col[i][j] = 0; else col[i][j] = GRID;
if (doshade>0) shades[i][j] = 255;
}
}
}
if (doshade>0) smoothshades();
/* plot picture */
switch (file_type)
{
case ppm:
if (do_bw) printppmBW(outfile);
else printppm(outfile);
break;
case xpm:
if (do_bw) printxpmBW(outfile);
else printxpm(outfile);
break;
case bmp:
if (do_bw) printbmpBW(outfile);
else printbmp(outfile);
break;
case heightfield:
printheights(outfile);
break;
}
return(0);
}
void readcolors(FILE *colfile, char* colorsname, char* biocolorsname)
{
int crow, cNum = 0, oldcNum, i;
if (NULL == (colfile = fopen(colorsname, "r")))
{
fprintf(stderr,
"Cannot open %s\n",
colorsname);
exit(1);
}
/* Format of colour file is a sequence of lines */
/* each consisting of four integers: */
/* colour_number red green blue */
/* where 0 <= colour_number <= 65535 */
/* and 0<= red, green, blue <= 255 */
/* The colour numbers must be increasing */
/* The first colours have special uses: */
/* 0 is usually black (0,0,0) */
/* 1 is usually white (255,255,255) */
/* 2 is the background colour */
/* 3 is used for latitude/longitude grid lines */
/* 4 and 5 are used for outlines and contour lines */
/* 6 upwards are used for altitudes */
/* Halfway between 6 and the max colour is sea level */
/* Shallowest sea is (max+6)/2 and land is above this */
/* With 65536 colours, (max+6)/2 = 32770 */
/* Colours between specified are interpolated */
for (crow = 0; !feof(colfile); crow++)
{
int rValue,
gValue,
bValue,
result = 0;
oldcNum = cNum; /* remember last colour number */
result = fscanf(colfile, " %d %d %d %d",
&cNum, &rValue, &gValue, &bValue);
if (result > 0)
{
if (cNum < oldcNum) cNum = oldcNum;
if (cNum > 65535) cNum = 65535;
rtable[cNum] = rValue;
gtable[cNum] = gValue;
btable[cNum] = bValue;
/* interpolate colours between oldcNum and cNum */
for (i = oldcNum+1; i<cNum; i++) {
rtable[i] = (rtable[oldcNum]*(cNum-i)+rtable[cNum]*(i-oldcNum))
/ (cNum-oldcNum);
gtable[i] = (gtable[oldcNum]*(cNum-i)+gtable[cNum]*(i-oldcNum))
/ (cNum-oldcNum);
btable[i] = (btable[oldcNum]*(cNum-i)+btable[cNum]*(i-oldcNum))
/ (cNum-oldcNum);
}
}
}
fclose(colfile);
nocols = cNum+1;
if (nocols < 10) nocols = 10;
HIGHEST = nocols - 1;
SEA = (HIGHEST+LOWEST)/2;
LAND = SEA+1;
for (i = cNum+1; i<nocols; i++) {
/* fill up rest of colour table with last read colour */
rtable[i] = rtable[cNum];
gtable[i] = gtable[cNum];
btable[i] = btable[cNum];
}
if (makeBiomes) {
/* set default biome colours */
rtable['I'-64+LAND] = 255;
gtable['I'-64+LAND] = 255;
btable['I'-64+LAND] = 255;
rtable['T'-64+LAND] = 210;
gtable['T'-64+LAND] = 210;
btable['T'-64+LAND] = 210;
rtable['G'-64+LAND] = 250;
gtable['G'-64+LAND] = 215;
btable['G'-64+LAND] = 165;
rtable['B'-64+LAND] = 105;
gtable['B'-64+LAND] = 155;
btable['B'-64+LAND] = 120;
rtable['D'-64+LAND] = 220;
gtable['D'-64+LAND] = 195;
btable['D'-64+LAND] = 175;
rtable['S'-64+LAND] = 225;
gtable['S'-64+LAND] = 155;
btable['S'-64+LAND] = 100;
rtable['F'-64+LAND] = 155;
gtable['F'-64+LAND] = 215;
btable['F'-64+LAND] = 170;
rtable['R'-64+LAND] = 170;
gtable['R'-64+LAND] = 195;
btable['R'-64+LAND] = 200;
rtable['W'-64+LAND] = 185;
gtable['W'-64+LAND] = 150;
btable['W'-64+LAND] = 160;
rtable['E'-64+LAND] = 130;
gtable['E'-64+LAND] = 190;
btable['E'-64+LAND] = 25;
rtable['O'-64+LAND] = 110;
gtable['O'-64+LAND] = 160;
btable['O'-64+LAND] = 170;
if (NULL != (colfile = fopen(biocolorsname, "r")))
for (crow = 0; !feof(colfile); crow++)
{
char letter;
int rValue, gValue, bValue, result = 0;
result = fscanf(colfile, " %c %d %d %d",
&letter, &rValue, &gValue, &bValue);
if (result > 0 && strchr("ITGBDSFRWEO",letter)>0) {
rtable[letter-64+LAND] = rValue;
gtable[letter-64+LAND] = gValue;
btable[letter-64+LAND] = bValue;
}
}
}
}
void makeoutline(int do_bw)
{
int i,j,k,t;
outx = (int*)calloc(Width*Height,sizeof(int));
outy = (int*)calloc(Width*Height,sizeof(int));
k=0;
for (i=1; i<Width-1; i++)
for (j=1; j<Height-1; j++)
if ((col[i][j] >= LOWEST && col[i][j] <= SEA) &&
(col[i-1][j] >= LAND || col[i+1][j] >= LAND ||
col[i][j-1] >= LAND || col[i][j+1] >= LAND ||
col[i-1][j-1] >= LAND || col[i-1][j+1] >= LAND ||
col[i+1][j-1] >= LAND || col[i+1][j+1] >= LAND)) {
/* if point is sea and any neighbour is not, add to outline */
outx[k] = i; outy[k++] = j;
}
int contourstep = 0;
if (contourLines > 0) {
contourstep = (HIGHEST-LAND)/(contourLines+1);
for (i=1; i<Width-1; i++)
for (j=1; j<Height-1; j++) {
t = (col[i][j] - LAND) / contourstep;
if (col[i][j] >= LAND &&
((col[i-1][j]-LAND) / contourstep > t ||
(col[i+1][j]-LAND) / contourstep > t ||
(col[i][j-1]-LAND) / contourstep > t ||
(col[i][j+1]-LAND) / contourstep > t)) {
/* if point is at contour line and any neighbour is higher */
outx[k] = i; outy[k++] = j;
}
}
}
if (coastContourLines > 0) {
contourstep = (LAND-LOWEST)/20;
for (i=1; i<Width-1; i++)
for (j=1; j<Height-1; j++) {
t = (col[i][j] - LAND) / contourstep;
if (col[i][j] <= SEA && t >= -coastContourLines &&
((col[i-1][j]-LAND) / contourstep > t ||
(col[i+1][j]-LAND) / contourstep > t ||
(col[i][j-1]-LAND) / contourstep > t ||
(col[i][j+1]-LAND) / contourstep > t)) {
/* if point is at contour line and any neighbour is higher */
outx[k] = i; outy[k++] = j;
}
}
}
if (do_bw) /* if outline only, clear colours */
for (i=0; i<Width; i++)
for (j=0; j<Height; j++) {
if (col[i][j] >= LOWEST)
col[i][j] = WHITE;
else col[i][j] = BLACK;
}
/* draw outline (in black if outline only) */
contourstep = (HIGHEST-LAND)/(contourLines+1);
for (j = 0; j < k; j++) {
if (do_bw) t = BLACK;
else {
t = col[outx[j]][outy[j]];
if (t != OUTLINE1 && t != OUTLINE2) {
if (contourLines > 0 && t >= LAND)
if (((t-LAND)/contourstep)%2 == 1)
t = OUTLINE1;
else t = OUTLINE2;
else if (t <= SEA)
t = OUTLINE1;
}
}
col[outx[j]][outy[j]] = t;
}
}