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/* Copyright (c) 1991 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* Program to convert lamp color from table and compute radiance.
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*/
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#include <stdio.h>
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#include "color.h"
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#define PI 3.14159265358979323846
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extern char *gets(), *strcpy();
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extern double atof();
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extern float *matchlamp();
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/* lamp parameters */
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#define LTYPE 0
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#define LUNIT 1
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#define LGEOM 2
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#define LOUTP 3
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#define NPARAMS 4
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int typecheck(), unitcheck(), geomcheck(), outpcheck();
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float *lampcolor; /* the lamp color (RGB) */
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double unit2meter; /* conversion from units to meters */
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double area; /* radiating area for this geometry */
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double lumens; /* total lamp lumens */
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struct {
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char *name;
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char value[64];
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int (*check)();
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char *help;
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} param[NPARAMS] = {
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{ "lamp type", "white", typecheck,
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"The lamp type is a string which corresponds to one of the types registered\n\
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in the lamp table file. A value of \"white\" means an uncolored source,\n\
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which may be preferable because it results in a color balanced image." },
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{ "length unit", "meter", unitcheck,
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"Unit must be one of: \"meter\", \"centimeter\", \"foot\", or \"inch\".\n\
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These may be abbreviated as a single letter." },
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{ "lamp geometry", "polygon", geomcheck,
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"The lamp geometry must be one of: \"polygon\", \"sphere\", \"cylinder\"\n\
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or \"ring\". These may be abbreviated as a single letter." },
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{ "total lamp lumens", "0", outpcheck,
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"This is the overall light output of the lamp and its fixture. If you do\n\
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not know this value explicitly, you can compute the approximate lumens\n\
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by multiplying the input wattage by 14 for incandescent fixtures or 70\n\
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for fluorescent fixtures." },
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};
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char *lamptab = "lamp.tab";
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char buf[64];
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int i;
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if (argc > 1) lamptab = argv[1];
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if (loadlamps(lamptab) == 0) {
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fprintf(stderr, "%s: no such lamp table\n", lamptab);
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exit(1);
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}
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printf("Program to compute lamp radiance. Enter '?' for help.\n");
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for ( ; ; ) {
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i = 0;
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while (i < NPARAMS) {
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printf("Enter %s [%s]: ", param[i].name,
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param[i].value);
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if (gets(buf) == NULL)
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exit(0);
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if (buf[0] == '?') {
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puts(param[i].help);
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continue;
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}
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if (buf[0])
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strcpy(param[i].value, buf);
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if (!(*param[i].check)(param[i].value)) {
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fprintf(stderr, "%s: bad value for %s\n",
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param[i].value, param[i].name);
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continue;
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}
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i++;
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}
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compute();
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}
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}
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typecheck(s) /* check lamp type */
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char *s;
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{
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lampcolor = matchlamp(s);
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return(lampcolor != NULL);
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}
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unitcheck(s) /* compute conversion to meters */
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char *s;
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{
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int len = strlen(s);
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switch (*s) {
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case 'm':
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if (strncmp(s, "meters", len))
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return(0);
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unit2meter = 1.0;
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return(1);
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case 'c':
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if (strncmp(s, "centimeters", len) && strncmp(s, "cms", len))
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return(0);
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unit2meter = 0.01;
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return(1);
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case 'f':
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if (strncmp(s, "foot", len) && strncmp(s, "feet", len))
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return(0);
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unit2meter = 0.3048;
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return(1);
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case 'i':
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if (strncmp(s, "inches", len))
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return(0);
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unit2meter = 0.0254;
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return(1);
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}
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return(0);
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}
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geomcheck(s) /* check/set lamp geometry */
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char *s;
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{
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int len = strlen(s);
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switch (*s) {
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case 'p':
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if (strncmp(s, "polygonal", len))
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return(0);
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return(getpolygon());
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case 's':
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if (strncmp(s, "sphere", len) && strncmp(s, "spherical", len))
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return(0);
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return(getsphere());
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case 'c':
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if (strncmp(s,"cylinder",len) && strncmp(s,"cylindrical",len))
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return(0);
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return(getcylinder());
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case 'r':
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if (strncmp(s, "ring", len) && strncmp(s, "disk", len))
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return(0);
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return(getring());
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}
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return(0);
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}
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outpcheck(s) /* check lumen output value */
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register char *s;
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{
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if ((*s < '0' || *s > '9') && *s != '.')
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return(0);
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lumens = atof(s);
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return(1);
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}
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compute() /* compute lamp radiance */
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{
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double whiteval;
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whiteval = lumens/area/(WHTEFFICACY*PI);
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printf("Lamp color (RGB) = %f %f %f\n",
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lampcolor[0]*whiteval,
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lampcolor[1]*whiteval,
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lampcolor[2]*whiteval);
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}
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getd(name, dp, help) /* get a positive double from stdin */
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char *name;
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double *dp;
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char *help;
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{
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char buf[32];
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again:
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printf("%s [%g]: ", name, *dp);
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if (gets(buf) == NULL)
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return(0);
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if (buf[0] == '?') {
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puts(help);
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goto again;
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}
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if ((buf[0] < '0' || buf[0] > '9') && buf[0] != '.')
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return(0);
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*dp = atof(buf);
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return(1);
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}
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getpolygon() /* get projected area for a polygon */
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{
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static double area = 1.0;
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getd("Polygon area", &area,
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"Enter the total radiating area of the polygon.");
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area = unit2meter*unit2meter * area;
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return(1);
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}
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getsphere() /* get projected area for a sphere */
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{
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static double radius = 1.0;
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getd("Sphere radius", &radius,
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"Enter the distance from the sphere's center to its surface.");
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area = 4.*PI*unit2meter*unit2meter * radius*radius;
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return(1);
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}
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getcylinder() /* get projected area for a cylinder */
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{
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static double length = 1.0, radius = 0.1;
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getd("Cylinder length", &length,
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"Enter the length of the cylinder.");
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getd("Cylinder radius", &radius,
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"Enter the distance from the cylinder's axis to its surface.");
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area = 2.*PI*unit2meter*unit2meter * radius*length;
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return(1);
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}
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getring() /* get projected area for a ring */
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{
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static double radius = 1.0;
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getd("Disk radius", &radius,
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"Enter the distance from the ring's center to its outer edge.\n\
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The inner radius must be zero.");
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area = PI*unit2meter*unit2meter * radius*radius;
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return(1);
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}
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