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xearth.c
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xearth.c
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/*
* xearth.c
* kirk johnson
* july 1993
*
* Copyright (C) 1989, 1990, 1993-1995, 1999 Kirk Lauritz Johnson
*
* Parts of the source code (as marked) are:
* Copyright (C) 1989, 1990, 1991 by Jim Frost
* Copyright (C) 1992 by Jamie Zawinski <[email protected]>
*
* Permission to use, copy, modify and freely distribute xearth for
* non-commercial and not-for-profit purposes is hereby granted
* without fee, provided that both the above copyright notice and this
* permission notice appear in all copies and in supporting
* documentation.
*
* Unisys Corporation holds worldwide patent rights on the Lempel Zev
* Welch (LZW) compression technique employed in the CompuServe GIF
* image file format as well as in other formats. Unisys has made it
* clear, however, that it does not require licensing or fees to be
* paid for freely distributed, non-commercial applications (such as
* xearth) that employ LZW/GIF technology. Those wishing further
* information about licensing the LZW patent should contact Unisys
* directly at ([email protected]) or by writing to
*
* Unisys Corporation
* Welch Licensing Department
* M/S-C1SW19
* P.O. Box 500
* Blue Bell, PA 19424
*
* The author makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT
* OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "xearth.h"
#include "kljcpyrt.h"
extern int errno;
#ifndef NO_SETPRIORITY
/* apparently some systems (possibly mt.xinu 4.3bsd?) may need
* <sys/time.h> to be included here before <sys/resource.h>.
*/
#include <sys/resource.h> /* for setpriority() */
#endif
#define ModeX (0) /* possible output_mode values */
#define ModePPM (1)
#define ModeGIF (2)
#define ModePNG (3)
#define ModeJPEG (4)
#define ModeBMP (5)
#define ModeTest (6)
#define ModeW (7)
/* tokens in specifiers are delimited by spaces, tabs, commas, and
* forward slashes
*/
#define IsTokenDelim(x) (((x)==' ')||((x)=='\t')||((x)==',')||((x)==' '))
#define NotTokenDelim(x) (!IsTokenDelim(x))
int main _P((int, char *[]));
void set_priority _P((int));
void output _P((void));
void test_mode _P((void));
void sun_relative_position _P((double *, double *));
void simple_orbit _P((time_t, double *, double *));
void pick_random_position _P((double *, double *));
void set_defaults _P((void));
int using_x _P((int, char *[]));
void command_line _P((int, char *[]));
char *progname; /* program name */
int proj_type; /* projection type */
int output_mode; /* output mode (X, PPM, ...) */
double view_lon; /* viewing position longitude */
double view_lat; /* viewing position latitude */
double view_rot; /* viewing rotation (degrees) */
int rotate_type; /* type of rotation */
int view_pos_type; /* type of viewing position */
double sun_rel_lon; /* view lon, relative to sun */
double sun_rel_lat; /* view lat, relative to sun */
double orbit_period; /* orbit period (seconds) */
double orbit_inclin; /* orbit inclination (degrees) */
double view_mag; /* viewing magnification */
int do_shade; /* render with shading? */
double sun_lon; /* sun position longitude */
double sun_lat; /* sun position latitude */
int compute_sun_pos; /* compute sun's position? */
int wdth; /* image width (pixels) */
int hght; /* image height (pixels) */
int shift_x; /* image shift (x, pixels) */
int shift_y; /* image shift (y, pixels) */
int do_stars; /* show stars in background? */
double star_freq; /* frequency of stars */
int big_stars; /* percent of doublewide stars */
int do_grid; /* show lon/lat grid? */
int grid_big; /* lon/lat grid line spacing */
int grid_small; /* dot spacing along grids */
int do_label; /* label image */
int do_markers; /* display markers (X only) */
char *markerfile; /* for user-spec. marker info */
char *mapfile; /* for image overlay file */
char *overlayfile[MAX_OVERLAY]; /* for overlay file */
int overlay_count; /* number of overlay files */
int wait_time; /* wait time between redraw */
double time_warp; /* passage of time multiplier */
int fixed_time; /* fixed viewing time (ssue) */
int day; /* day side brightness (%) */
int night; /* night side brightness (%) */
int terminator; /* terminator discontinuity, % */
double xgamma; /* gamma correction (X only) */
int use_two_pixmaps; /* use two pixmaps? (X only) */
int num_colors; /* number of colors to use */
int do_fork; /* fork child process? */
int priority; /* desired process priority */
time_t start_time = 0;
time_t current_time;
char errmsgbuf[1024]; /* for formatting warning/error msgs */
int main(argc, argv)
int argc;
char *argv[];
{
set_defaults();
progname = argv[0];
if (using_x(argc, argv))
{
#if defined HAVE_WAYLAND
command_line_w(argc, argv);
#elif defined HAVE_X11
command_line_x(argc, argv);
#else
usage("x11 display mode not supported in this build");
#endif
}
else
{
command_line(argc, argv);
if (isatty(fileno(stdout))) {
usage("xearth refuses to write image data to a tty");
}
}
if (mapfile != NULL || overlayfile[0] != NULL)
num_colors = TRUE_COLOR;
if (priority != 0)
set_priority(priority);
srandom(((int) time(NULL)) + ((int) getpid()));
output();
return 0;
}
#ifdef NO_SETPRIORITY
/* setpriority()-like functionality for System V
* derivates that only provide nice()
*/
void set_priority(new)
int new;
{
int old;
/* determine current priority of the process
*/
errno = 0;
old = nice(0);
if ((old == -1) && (errno != 0))
{
perror("nice");
exit(-1);
}
/* try to change priority to new
*/
new = nice(new - old);
if ((new == -1) && (errno != 0))
{
perror("nice");
exit(-1);
}
}
#else /* NO_SETPRIORITY */
/* for systems that provide setpriority(),
* set_priority() is just a wrapper
*/
void set_priority(new)
int new;
{
if ((setpriority(PRIO_PROCESS, getpid(), new) == -1))
{
perror("setpriority");
exit(-1);
}
}
#endif /* NO_SETPRIORITY */
void output()
{
switch (output_mode)
{
case ModePPM:
ppm_output();
break;
case ModeGIF:
gif_output();
break;
case ModePNG:
png_output();
break;
case ModeJPEG:
jpeg_output();
break;
case ModeBMP:
bmp_output();
break;
#ifdef HAVE_X11
case ModeX:
if ((!do_fork) || (fork() == 0))
x11_output();
break;
#endif
#ifdef HAVE_WAYLAND
case ModeW:
if ((!do_fork) || (fork() == 0))
wayland_output();
break;
#endif
case ModeTest:
test_mode();
break;
default:
assert(0);
}
}
void test_mode()
{
}
void compute_positions()
{
/* determine "current" time
*/
if (fixed_time == 0)
{
current_time = time(NULL);
if (start_time == 0)
start_time = current_time;
else
current_time = start_time + (current_time - start_time) * time_warp;
}
else
{
current_time = fixed_time;
}
/* determine position on earth's surface where sun is directly
* overhead
*/
if (compute_sun_pos)
sun_position(current_time, &sun_lat, &sun_lon);
/* determine viewing position
*/
if (view_pos_type == ViewPosTypeSun)
{
sun_relative_position(&view_lat, &view_lon);
}
else if (view_pos_type == ViewPosTypeOrbit)
{
simple_orbit(current_time, &view_lat, &view_lon);
}
else if (view_pos_type == ViewPosTypeRandom)
{
pick_random_position(&view_lat, &view_lon);
}
else if (view_pos_type == ViewPosTypeMoon)
{
moon_position(current_time, &view_lat, &view_lon);
}
/* for ViewRotGalactic, compute appropriate viewing rotation
*/
if (rotate_type == ViewRotGalactic)
{
view_rot = sun_lat * sin((view_lon - sun_lon) * (M_PI / 180));
}
}
void sun_relative_position(lat_ret, lon_ret)
double *lat_ret; /* (return) latitude */
double *lon_ret; /* (return) longitude */
{
double lat, lon;
lat = sun_lat + sun_rel_lat;
lon = sun_lon + sun_rel_lon;
/* sanity check */
assert((lat >= -180) && (lat <= 180));
assert((lon >= -360) && (lon <= 360));
if (lat > 90)
{
lat = 180 - lat;
lon += 180;
}
else if (lat < -90)
{
lat = -180 - lat;
lon += 180;
}
if (lon > 180)
{
do
lon -= 360;
while (lon > 180);
}
else if (lon < -180)
{
do
lon += 360;
while (lon < -180);
}
*lat_ret = lat;
*lon_ret = lon;
}
void simple_orbit(ssue, lat, lon)
time_t ssue; /* seconds since unix epoch */
double *lat; /* (return) latitude */
double *lon; /* (return) longitude */
{
double x, y, z;
double a, c, s;
double t1, t2;
/* start at 0 N 0 E */
x = 0;
y = 0;
z = 1;
/* rotate in about y axis (from z towards x) according to the number
* of orbits we've completed
*/
a = ((double) ssue / orbit_period) * (2*M_PI);
c = cos(a);
s = sin(a);
t1 = c*z - s*x;
t2 = s*z + c*x;
z = t1;
x = t2;
/* rotate about z axis (from x towards y) according to the
* inclination of the orbit
*/
a = orbit_inclin * (M_PI/180);
c = cos(a);
s = sin(a);
t1 = c*x - s*y;
t2 = s*x + c*y;
x = t1;
y = t2;
/* rotate about y axis (from x towards z) according to the number of
* rotations the earth has made
*/
a = ((double) ssue / EarthPeriod) * (2*M_PI);
c = cos(a);
s = sin(a);
t1 = c*x - s*z;
t2 = s*x + c*z;
x = t1;
z = t2;
*lat = asin(y) * (180/M_PI);
*lon = atan2(x, z) * (180/M_PI);
}
/* pick a position (lat, lon) at random
*/
void pick_random_position(lat_ret, lon_ret)
double *lat_ret; /* (return) latitude */
double *lon_ret; /* (return) longitude */
{
int i;
double pos[3];
double mag;
double s_lat, c_lat;
double s_lon, c_lon;
/* select a vector at random */
do
{
mag = 0;
for (i=0; i<3; i++)
{
pos[i] = ((random() % 20001) * 1e-4) - 1;
mag += pos[i] * pos[i];
}
} while ((mag > 1.0) || (mag < 0.01));
/* normalize the vector */
mag = sqrt(mag);
for (i=0; i<3; i++)
pos[i] /= mag;
/* convert to (lat, lon) */
s_lat = pos[1];
c_lat = sqrt(1 - s_lat*s_lat);
s_lon = pos[0] / c_lat;
c_lon = pos[2] / c_lat;
*lat_ret = atan2(s_lat, c_lat) * (180/M_PI);
*lon_ret = atan2(s_lon, c_lon) * (180/M_PI);
}
/* look through the command line arguments to figure out if we're
* using X or not (if "-ppm", "-gif", "-png", "-jpeg", "-bmp", or "-test" is found, we're not
* using X, otherwise we are).
*/
int using_x(argc, argv)
int argc;
char *argv[];
{
int i;
/* loop through the args, break if we find "-ppm", "-gif", "-png", "-jpeg", "-bmp", or
* "-test"
*/
for (i=1; i<argc; i++)
if ((strcmp(argv[i], "-ppm") == 0) ||
(strcmp(argv[i], "-gif") == 0) ||
(strcmp(argv[i], "-png") == 0) ||
(strcmp(argv[i], "-jpeg") == 0) ||
(strcmp(argv[i], "-bmp") == 0) ||
(strcmp(argv[i], "-test") == 0))
break;
/* if we made it through the loop without finding "-ppm", "-gif", "-png", "-jpeg", "-bmp", or
* "-test" (and breaking out), assume we're using X.
*/
return (i == argc);
}
/* set_defaults() gets called at xearth startup (before command line
* arguments are handled), regardless of what output mode (x, ppm,
* gif, png, jpeg, bmp) is being used.
*/
void set_defaults()
{
#if defined HAVE_WAYLAND
output_mode = ModeW;
#else
output_mode = ModeX;
#endif
proj_type = ProjTypeOrthographic;
view_pos_type = ViewPosTypeSun;
sun_rel_lat = 0;
sun_rel_lon = 0;
compute_sun_pos = 1;
view_rot = 0;
rotate_type = ViewRotNorth;
wdth = DefaultWdthHght;
hght = DefaultWdthHght;
shift_x = 0;
shift_y = 0;
view_mag = 1.0;
do_shade = 1;
do_label = 0;
do_markers = 1;
wait_time = 300;
time_warp = 1;
day = 100;
night = 5;
terminator = 1;
use_two_pixmaps = 1;
num_colors = 64;
do_fork = 0;
priority = 0;
do_stars = 1;
star_freq = 0.002;
big_stars = 0;
do_grid = 0;
grid_big = 6;
grid_small = 15;
fixed_time = 0;
xgamma = 1.0;
}
/* procedure for interpreting command line arguments when we're not
* using X; command_line_x() is used when we are.
*/
void command_line(argc, argv)
int argc;
char *argv[];
{
int i;
progname = argv[0];
for (i=1; i<argc; i++)
{
if (strcmp(argv[i], "-proj") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -proj");
decode_proj_type(argv[i]);
}
else if (strcmp(argv[i], "-pos") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -pos");
decode_viewing_pos(argv[i]);
}
else if (strcmp(argv[i], "-rot") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -rot");
decode_rotation(argv[i]);
}
else if (strcmp(argv[i], "-sunpos") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -sunpos");
decode_sun_pos(argv[i]);
}
else if (strcmp(argv[i], "-mag") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -mag");
sscanf(argv[i], "%lf", &view_mag);
if (view_mag <= 0)
fatal("viewing magnification must be positive");
}
else if (strcmp(argv[i], "-size") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -size");
decode_size(argv[i]);
}
else if (strcmp(argv[i], "-shift") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -shift");
decode_shift(argv[i]);
}
else if (strcmp(argv[i], "-shade") == 0)
{
do_shade = 1;
}
else if (strcmp(argv[i], "-noshade") == 0)
{
do_shade = 0;
}
else if (strcmp(argv[i], "-label") == 0)
{
do_label = 1;
}
else if (strcmp(argv[i], "-nolabel") == 0)
{
do_label = 0;
}
else if (strcmp(argv[i], "-labelpos") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -labelpos");
warning("-labelpos not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-markers") == 0)
{
do_markers = 1;
warning("markers not supported with GIF and PPM output");
}
else if (strcmp(argv[i], "-nomarkers") == 0)
{
do_markers = 0;
}
else if (strcmp(argv[i], "-markerfile") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -markerfile");
warning("-markerfile not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-showmarkers") == 0)
{
warning("-showmarkers not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-stars") == 0)
{
do_stars = 1;
}
else if (strcmp(argv[i], "-nostars") == 0)
{
do_stars = 0;
}
else if (strcmp(argv[i], "-starfreq") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -starfreq");
sscanf(argv[i], "%lf", &star_freq);
if ((star_freq < 0) || (star_freq > 1))
fatal("arg to -starfreq must be between 0 and 1");
}
else if (strcmp(argv[i], "-bigstars") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -bigstars");
sscanf(argv[i], "%d", &big_stars);
if ((big_stars < 0) || (big_stars > 100))
fatal("arg to -bigstars must be between 0 and 100");
}
else if (strcmp(argv[i], "-grid") == 0)
{
do_grid = 1;
}
else if (strcmp(argv[i], "-nogrid") == 0)
{
do_grid = 0;
}
else if (strcmp(argv[i], "-grid1") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -grid1");
sscanf(argv[i], "%d", &grid_big);
if (grid_big <= 0)
fatal("arg to -grid1 must be positive");
}
else if (strcmp(argv[i], "-grid2") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -grid2");
sscanf(argv[i], "%d", &grid_small);
if (grid_small <= 0)
fatal("arg to -grid2 must be positive");
}
else if (strcmp(argv[i], "-day") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -day");
sscanf(argv[i], "%d", &day);
if ((day > 100) || (day < 0))
fatal("arg to -day must be between 0 and 100");
}
else if (strcmp(argv[i], "-night") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -night");
sscanf(argv[i], "%d", &night);
if ((night > 100) || (night < 0))
fatal("arg to -night must be between 0 and 100");
}
else if (strcmp(argv[i], "-term") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -term");
sscanf(argv[i], "%d", &terminator);
if ((terminator > 100) || (terminator < 0))
fatal("arg to -term must be between 0 and 100");
}
else if (strcmp(argv[i], "-mapfile") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -mapfile");
mapfile = argv[i];
}
else if (strcmp(argv[i], "-overlayfile") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -overlayfile");
decode_overlay(argv[i]);
}
else if (strcmp(argv[i], "-gamma") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -gamma");
sscanf(argv[i], "%lf", &xgamma);
if (xgamma <= 0)
fatal("arg to -gamma must be positive");
warning("gamma correction not supported with GIF and PPM output");
}
else if (strcmp(argv[i], "-wait") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -wait");
sscanf(argv[i], "%d", &wait_time);
if (wait_time < 0)
fatal("arg to -wait must be non-negative");
}
else if (strcmp(argv[i], "-timewarp") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -timewarp");
sscanf(argv[i], "%lf", &time_warp);
if (time_warp <= 0)
fatal("arg to -timewarp must be positive");
}
else if (strcmp(argv[i], "-time") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -time");
sscanf(argv[i], "%d", &fixed_time);
}
else if (strcmp(argv[i], "-onepix") == 0)
{
use_two_pixmaps = 0;
warning("-onepix not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-twopix") == 0)
{
use_two_pixmaps = 1;
warning("-twopix not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-mono") == 0)
{
warning("monochrome mode not supported with GIF and PPM output");
}
else if (strcmp(argv[i], "-nomono") == 0)
{
warning("monochrome mode not supported with GIF and PPM output");
}
else if (strcmp(argv[i], "-ncolors") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -ncolors");
decode_colors(argv[i]);
}
else if (strcmp(argv[i], "-font") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -font");
warning("-font not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-root") == 0)
{
/* Ugly hack: we lazily reuse this function in wayland.c */
if (!using_x(argc, argv))
warning("-root not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-noroot") == 0)
{
warning("-noroot not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-geometry") == 0)
{
warning("-geometry not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-title") == 0)
{
warning("-title not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-iconname") == 0)
{
warning("-iconname not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-name") == 0)
{
warning("-name not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-fork") == 0)
{
do_fork = 1;
}
else if (strcmp(argv[i], "-nofork") == 0)
{
do_fork = 0;
}
else if (strcmp(argv[i], "-once") == 0)
{
warning("-once not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-noonce") == 0)
{
warning("-once not relevant for GIF or PPM output");
}
else if (strcmp(argv[i], "-nice") == 0)
{
i += 1;
if (i >= argc) usage("missing arg to -nice");
sscanf(argv[i], "%d", &priority);
}
else if (strcmp(argv[i], "-version") == 0)
{
version_info(1);
}
else if (strcmp(argv[i], "-ppm") == 0)
{
output_mode = ModePPM;
}
else if (strcmp(argv[i], "-gif") == 0)
{
output_mode = ModeGIF;
}
else if (strcmp(argv[i], "-png") == 0)
{
output_mode = ModePNG;
}
else if (strcmp(argv[i], "-jpeg") == 0)
{
output_mode = ModeJPEG;
}
else if (strcmp(argv[i], "-bmp") == 0)
{
output_mode = ModeBMP;
}
else if (strcmp(argv[i], "-test") == 0)
{
output_mode = ModeTest;
}
else if (strcmp(argv[i], "-display") == 0)
{
warning("-display not relevant for GIF or PPM output");
}
else
{
usage(NULL);
}
}
}
/* if efficiency really mattered here (which it doesn't), this code
* could definitely be made quite a bit more efficient.
*/
char **tokenize(s, argc_ret, msg)
char *s;
int *argc_ret;
const char **msg;
{
int lim;
int argc;
char **argv;
*msg = NULL;
lim = 4;
argc = 0;
argv = (char **) malloc((unsigned) sizeof(char *) * lim);
assert(argv != NULL);
while (1)
{
/* skip delimiters (space, tab, comma, forward slash)
*/
while (1)
{
if (NotTokenDelim(*s)) break;
*s = '\0';
s += 1;
}
if ((*s) == '\0')
{
/* if we're at the end of s, no more tokens
*/
break;
}
else if ((*s) == '#')
{
/* if we find a comment character (#), replace it
* with a NUL and act like we found the end s
*/
*s = '\0';
break;
}
/* make sure there's room for another token
*/
if (argc == lim)
{
lim *= 2;
argv = (char **) realloc(argv, (unsigned) sizeof(char *) * lim);
assert(argv != NULL);
}
/* get the next token
*/
if ((*s) == '"')
{
/* string token
*/
*s = '\0';
s += 1;
argv[argc++] = s;
while (((*s) != '"') && ((*s) != '\0'))
s += 1;
if ((*s) == '\0')
{
/* oops, never found closing double quote
*/
*msg = "unterminated string (missing \")";
}
else
{
/* string token terminated normally
*/
*s = '\0';
s += 1;
}
}
else
{
/* normal token
*/
argv[argc++] = s;
while (NotTokenDelim(*s) &&
((*s) != '#') && ((*s) != '"') && ((*s) != '\0'))
s += 1;
}
}
*argc_ret = argc;
return argv;
}
/* decode projection type; three possibilities:
* orthographic - orthographic projection (short form: orth)
* mercator - mercator projection (short form: merc)
* cylindrical - cylindrical projection (short form: cyl)
*/
void decode_proj_type(s)
char *s;
{
if ((strcmp(s, "orthographic") == 0) || (strcmp(s, "orth") == 0))
{
proj_type = ProjTypeOrthographic;
}
else if ((strcmp(s, "mercator") == 0) || (strcmp(s, "merc") == 0))
{
proj_type = ProjTypeMercator;
}
else if ((strcmp(s, "cylindrical") == 0) || (strcmp(s, "cyl") == 0))
{
proj_type = ProjTypeCylindrical;
}
else
{
sprintf(errmsgbuf, "unknown projection type (%s)", s);
fatal(errmsgbuf);
}
}
/* decode viewing position specifier; five possibilities:
*
* fixed lat lon - viewing position fixed wrt earth at (lat, lon)
*
* sunrel lat lon - viewing position fixed wrt sun at (lat, lon)
* [position interpreted as if sun was at (0, 0)]
*
* orbit per inc - moving viewing position following simple orbit
* with period per and inclination inc
*
* random - random viewing position