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root/radiance/ray/src/cv/lampcolor.c
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Comparing ray/src/cv/lampcolor.c (file contents):
Revision 1.5 by greg, Thu Sep 12 13:26:16 1991 UTC vs.
Revision 2.11 by greg, Sat Dec 28 18:05:14 2019 UTC

# Line 1 | Line 1
1 – /* Copyright (c) 1991 Regents of the University of California */
2 –
1   #ifndef lint
2 < static char SCCSid[] = "$SunId$ LBL";
2 > static const char       RCSid[] = "$Id$";
3   #endif
6 –
4   /*
5   * Program to convert lamp color from table and compute radiance.
6   */
7  
8 < #include <stdio.h>
8 > #include <math.h>
9  
10 < #define PI      3.14159265358979323846
10 > #include "rtmath.h"
11 > #include "rtio.h"
12 > #include "color.h"
13  
15 – extern char     *gets(), *strcpy();
16 – extern double   atof();
17 – extern float    *matchlamp();
18 –
14                                  /* lamp parameters */
15   #define LTYPE           0
16   #define LUNIT           1
# Line 23 | Line 18 | extern float   *matchlamp();
18   #define LOUTP           3
19   #define NPARAMS         4
20  
21 < int     typecheck(), unitcheck(), geomcheck(), outpcheck();
21 > static int typecheck(char *s);
22 > static int unitcheck(char *s);
23 > static int geomcheck(char *s);
24 > static int outpcheck(char *s);
25 > static void compute(void);
26 > static int getpolygon(void), getsphere(void), getcylinder(void), getring(void);
27 > static int getd(char *name, double *dp, char *help);
28  
29 +
30   float   *lampcolor;             /* the lamp color (RGB) */
31   double  unit2meter;             /* conversion from units to meters */
32 < double  projarea;               /* projected area for this geometry */
32 > double  area;                   /* radiating area for this geometry */
33   double  lumens;                 /* total lamp lumens */
34  
35   struct {
# Line 36 | Line 38 | struct {
38          int     (*check)();
39          char    *help;
40   } param[NPARAMS] = {
41 <        { "lamp type", "white", typecheck,
41 >        { "lamp type", "WHITE", typecheck,
42   "The lamp type is a string which corresponds to one of the types registered\n\
43 < in the lamp table file.  A value of \"white\" means an uncolored source,\n\
43 > in the lamp table file.  A value of \"WHITE\" means an uncolored source,\n\
44   which may be preferable because it results in a color balanced image." },
45          { "length unit", "meter", unitcheck,
46   "Unit must be one of:  \"meter\", \"centimeter\", \"foot\", or \"inch\".\n\
# Line 54 | Line 56 | for fluorescent fixtures." },
56   };
57  
58  
59 < main(argc, argv)
60 < int     argc;
61 < char    *argv[];
59 > int
60 > main(
61 >        int     argc,
62 >        char    *argv[]
63 > )
64   {
65          char    *lamptab = "lamp.tab";
66          char    buf[64];
# Line 73 | Line 77 | char   *argv[];
77                  while (i < NPARAMS) {
78                          printf("Enter %s [%s]: ", param[i].name,
79                                          param[i].value);
80 <                        if (gets(buf) == NULL)
80 >                        if (fgetline(buf, sizeof(buf), stdin) == NULL)
81                                  exit(0);
82                          if (buf[0] == '?') {
83                                  puts(param[i].help);
# Line 93 | Line 97 | char   *argv[];
97   }
98  
99  
100 < typecheck(s)                    /* check lamp type */
101 < char    *s;
100 > static int
101 > typecheck(                      /* check lamp type */
102 >        char    *s
103 > )
104   {
105          lampcolor = matchlamp(s);
106          return(lampcolor != NULL);
107   }
108  
109  
110 < unitcheck(s)                    /* compute conversion to meters */
111 < char    *s;
110 > static int
111 > unitcheck(                      /* compute conversion to meters */
112 >        char    *s
113 > )
114   {
115          int     len = strlen(s);
116  
# Line 132 | Line 140 | char   *s;
140   }
141  
142  
143 < geomcheck(s)                    /* check/set lamp geometry */
144 < char    *s;
143 > static int
144 > geomcheck(                      /* check/set lamp geometry */
145 >        char    *s
146 > )
147   {
148          int     len = strlen(s);
149  
# Line 159 | Line 169 | char   *s;
169   }
170  
171  
172 < outpcheck(s)                    /* check lumen output value */
173 < register char   *s;
172 > static int
173 > outpcheck(                      /* check lumen output value */
174 >        register char   *s
175 > )
176   {
177          if ((*s < '0' || *s > '9') && *s != '.')
178                  return(0);
# Line 169 | Line 181 | register char  *s;
181   }
182  
183  
184 < compute()                       /* compute lamp radiance */
184 > static void
185 > compute(void)                   /* compute lamp radiance */
186   {
187          double  whiteval;
188  
189 <        whiteval = lumens/470./projarea;
189 >        whiteval = lumens/area/(WHTEFFICACY*PI);
190  
191          printf("Lamp color (RGB) = %f %f %f\n",
192                          lampcolor[0]*whiteval,
# Line 182 | Line 195 | compute()                      /* compute lamp radiance */
195   }
196  
197  
198 < getd(dp)                        /* get a positive double from stdin */
199 < double  *dp;
198 > static int
199 > getd(           /* get a positive double from stdin */
200 >        char    *name,
201 >        double  *dp,
202 >        char    *help
203 > )
204   {
205          char    buf[32];
206 <
207 <        if (gets(buf) == NULL)
206 > again:
207 >        printf("%s [%g]: ", name, *dp);
208 >        if (fgets(buf, sizeof(buf), stdin) == NULL)
209                  return(0);
210 +        if (buf[0] == '?') {
211 +                puts(help);
212 +                goto again;
213 +        }
214          if ((buf[0] < '0' || buf[0] > '9') && buf[0] != '.')
215                  return(0);
216          *dp = atof(buf);
# Line 196 | Line 218 | double *dp;
218   }
219  
220  
221 < getpolygon()                    /* get projected area for a polygon */
221 > static int
222 > getpolygon(void)                        /* get projected area for a polygon */
223   {
224 <        static double   area = 1.0;
224 >        static double   parea = 1.0;
225  
226 <        printf("Polygon area [%g]: ", area);
227 <        getd(&area);
228 <        projarea = PI*unit2meter*unit2meter * area;
226 >        getd("Polygon area", &parea,
227 >                "Enter the total radiating area of the polygon.");
228 >        area = unit2meter*unit2meter * parea;
229          return(1);
230   }
231  
232  
233 < getsphere()                     /* get projected area for a sphere */
233 > static int
234 > getsphere(void)                 /* get projected area for a sphere */
235   {
236          static double   radius = 1.0;
237  
238 <        printf("Sphere radius [%g]: ", radius);
239 <        getd(&radius);
240 <        projarea = 4.*PI*PI*unit2meter*unit2meter * radius*radius;
238 >        getd("Sphere radius", &radius,
239 >                "Enter the distance from the sphere's center to its surface.");
240 >        area = 4.*PI*unit2meter*unit2meter * radius*radius;
241          return(1);
242   }
243  
244  
245 < getcylinder()                   /* get projected area for a cylinder */
245 > static int
246 > getcylinder(void)                       /* get projected area for a cylinder */
247   {
248          static double   length = 1.0, radius = 0.1;
249  
250 <        printf("Cylinder length [%g]: ", length);
251 <        getd(&length);
252 <        printf("Cylinder radius [%g]: ", radius);
253 <        getd(&radius);
254 <        projarea = PI*PI*2.*PI*unit2meter*unit2meter * radius*length;
250 >        getd("Cylinder length", &length,
251 >                "Enter the length of the cylinder.");
252 >        getd("Cylinder radius", &radius,
253 >                "Enter the distance from the cylinder's axis to its surface.");
254 >        area = 2.*PI*unit2meter*unit2meter * radius*length;
255          return(1);
256   }
257  
258  
259 < getring()                       /* get projected area for a ring */
259 > static int
260 > getring(void)                   /* get projected area for a ring */
261   {
262          static double   radius = 1.0;
263  
264 <        printf("Disk radius [%g]: ", radius);
265 <        getd(&radius);
266 <        projarea = PI*PI*unit2meter*unit2meter * radius*radius;
264 >        getd("Disk radius", &radius,
265 > "Enter the distance from the ring's center to its outer edge.\n\
266 > The inner radius must be zero.");
267 >        area = PI*unit2meter*unit2meter * radius*radius;
268          return(1);
269   }

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