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#include <math.h> |
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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(); |
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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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else |
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userror("bad option"); |
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if (fabs(s_meridian-s_longitude) > 30*PI/180) |
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fprintf(stderr, |
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"%s: warning: %.1f hours btwn. standard meridian and longitude\n", |
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progname, (s_longitude-s_meridian)*12/PI); |
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printhead(argc, argv); |
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computesky(); |
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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 (zenithbr <= 0.0) |
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if (cloudy) { |
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zenithbr = 8.6*sundir[2] + .123; |
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zenithbr *= 1000.0/683.0; |
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zenithbr *= 1000.0/SKYEFFICACY; |
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} else { |
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zenithbr = (1.376*turbidity-1.81)*tan(altitude)+0.38; |
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zenithbr *= 1000.0/683.0; |
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zenithbr *= 1000.0/SKYEFFICACY; |
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} |
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if (zenithbr < 0.0) |
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zenithbr = 0.0; |
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printf("# Ground ambient level: %f\n", groundbr); |
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if (sundir[2] > 0.0) { |
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if (sundir[2] > .16) |
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< |
solarbr = 2.47e6 - 3.15e5/sundir[2]; |
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solarbr = (1.5e9/SUNEFFICACY) * |
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(1.147 - .147/sundir[2]); |
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else |
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solarbr = 5e5; |
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solarbr = 1.5e9/SUNEFFICACY*(1.147-.147/.16); |
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groundbr += solarbr*6e-5*sundir[2]/PI; |
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} else |
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dosun = 0; |
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printsky() /* print out sky */ |
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{ |
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register int i; |
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if (dosun) { |
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printf("\nvoid light solar\n"); |
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printf("0\n0\n"); |
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printf("3 %f %f %f\n", solarbr, solarbr, solarbr); |
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printf("3 %.2e %.2e %.2e\n", solarbr, solarbr, solarbr); |
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printf("\nsolar source sun\n"); |
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printf("0\n0\n"); |
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printf("4 %f %f %f 0.5\n", sundir[0], sundir[1], sundir[2]); |
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printf("2 skybright skybright.cal\n"); |
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printf("0\n"); |
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if (cloudy) |
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printf("3 1 %f %f\n", zenithbr, groundbr); |
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printf("3 1 %.2e %.2e\n", zenithbr, groundbr); |
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else |
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printf("7 -1 %f %f %f %f %f %f\n", zenithbr, groundbr, F2, |
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sundir[0], sundir[1], sundir[2]); |
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printf("7 -1 %.2e %.2e %.2e %f %f %f\n", zenithbr, groundbr, |
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F2, sundir[0], sundir[1], sundir[2]); |
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} |
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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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} |
