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#include "color.h" |
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#ifndef atof |
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extern double atof(); |
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#endif |
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extern char *strcpy(), *strcat(), *malloc(); |
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extern double stadj(), sdec(), sazi(), salt(); |
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extern double s_longitude; |
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extern double s_meridian; |
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/* required values */ |
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int month, day; |
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double hour; |
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int month, day; /* date */ |
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double hour; /* standard time */ |
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double altitude, azimuth; /* or solar angles */ |
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/* default values */ |
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int cloudy = 0; |
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int dosun = 1; |
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int argc; |
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char *argv[]; |
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{ |
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extern double atof(), fabs(); |
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extern double fabs(); |
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int i; |
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progname = argv[0]; |
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} |
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if (argc < 4) |
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userror("arg count"); |
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month = atoi(argv[1]); |
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day = atoi(argv[2]); |
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hour = atof(argv[3]); |
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if (!strcmp(argv[1], "-ang")) { |
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altitude = atof(argv[2]) * (PI/180); |
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azimuth = atof(argv[3]) * (PI/180); |
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month = 0; |
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} else { |
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month = atoi(argv[1]); |
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day = atoi(argv[2]); |
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hour = atof(argv[3]); |
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} |
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for (i = 4; i < argc; i++) |
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if (argv[i][0] == '-' || argv[i][0] == '+') |
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switch (argv[i][1]) { |
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computesky() /* compute sky parameters */ |
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{ |
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int jd; |
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double sd, st; |
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double altitude, azimuth; |
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/* compute solar direction */ |
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jd = jdate(month, day); /* Julian date */ |
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sd = sdec(jd); /* solar declination */ |
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st = hour + stadj(jd); /* solar time */ |
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altitude = salt(sd, st); |
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azimuth = sazi(sd, st); |
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if (month) { /* from date and time */ |
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int jd; |
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double sd, st; |
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jd = jdate(month, day); /* Julian date */ |
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sd = sdec(jd); /* solar declination */ |
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st = hour + stadj(jd); /* solar time */ |
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altitude = salt(sd, st); |
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azimuth = sazi(sd, st); |
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} |
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sundir[0] = -sin(azimuth)*cos(altitude); |
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sundir[1] = -cos(azimuth)*cos(altitude); |
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sundir[2] = sin(altitude); |
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if (msg != NULL) |
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fprintf(stderr, "%s: Use error - %s\n", progname, msg); |
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fprintf(stderr, "Usage: %s month day hour [options]\n", progname); |
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fprintf(stderr, " Or: %s -ang altitude azimuth [options]\n", progname); |
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fprintf(stderr, " Or: %s -defaults\n", progname); |
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exit(1); |
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} |