1 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* Program to convert lamp color from table and compute radiance. |
9 |
*/ |
10 |
|
11 |
#include <stdio.h> |
12 |
|
13 |
#include "color.h" |
14 |
|
15 |
#define PI 3.14159265358979323846 |
16 |
|
17 |
extern char *gets(), *strcpy(); |
18 |
#ifndef atof |
19 |
extern double atof(); |
20 |
#endif |
21 |
extern float *matchlamp(); |
22 |
|
23 |
/* lamp parameters */ |
24 |
#define LTYPE 0 |
25 |
#define LUNIT 1 |
26 |
#define LGEOM 2 |
27 |
#define LOUTP 3 |
28 |
#define NPARAMS 4 |
29 |
|
30 |
int typecheck(), unitcheck(), geomcheck(), outpcheck(); |
31 |
|
32 |
float *lampcolor; /* the lamp color (RGB) */ |
33 |
double unit2meter; /* conversion from units to meters */ |
34 |
double area; /* radiating area for this geometry */ |
35 |
double lumens; /* total lamp lumens */ |
36 |
|
37 |
struct { |
38 |
char *name; |
39 |
char value[64]; |
40 |
int (*check)(); |
41 |
char *help; |
42 |
} param[NPARAMS] = { |
43 |
{ "lamp type", "white", typecheck, |
44 |
"The lamp type is a string which corresponds to one of the types registered\n\ |
45 |
in the lamp table file. A value of \"white\" means an uncolored source,\n\ |
46 |
which may be preferable because it results in a color balanced image." }, |
47 |
{ "length unit", "meter", unitcheck, |
48 |
"Unit must be one of: \"meter\", \"centimeter\", \"foot\", or \"inch\".\n\ |
49 |
These may be abbreviated as a single letter." }, |
50 |
{ "lamp geometry", "polygon", geomcheck, |
51 |
"The lamp geometry must be one of: \"polygon\", \"sphere\", \"cylinder\"\n\ |
52 |
or \"ring\". These may be abbreviated as a single letter." }, |
53 |
{ "total lamp lumens", "0", outpcheck, |
54 |
"This is the overall light output of the lamp and its fixture. If you do\n\ |
55 |
not know this value explicitly, you can compute the approximate lumens\n\ |
56 |
by multiplying the input wattage by 14 for incandescent fixtures or 70\n\ |
57 |
for fluorescent fixtures." }, |
58 |
}; |
59 |
|
60 |
|
61 |
main(argc, argv) |
62 |
int argc; |
63 |
char *argv[]; |
64 |
{ |
65 |
char *lamptab = "lamp.tab"; |
66 |
char buf[64]; |
67 |
int i; |
68 |
|
69 |
if (argc > 1) lamptab = argv[1]; |
70 |
if (loadlamps(lamptab) == 0) { |
71 |
fprintf(stderr, "%s: no such lamp table\n", lamptab); |
72 |
exit(1); |
73 |
} |
74 |
printf("Program to compute lamp radiance. Enter '?' for help.\n"); |
75 |
for ( ; ; ) { |
76 |
i = 0; |
77 |
while (i < NPARAMS) { |
78 |
printf("Enter %s [%s]: ", param[i].name, |
79 |
param[i].value); |
80 |
if (gets(buf) == NULL) |
81 |
exit(0); |
82 |
if (buf[0] == '?') { |
83 |
puts(param[i].help); |
84 |
continue; |
85 |
} |
86 |
if (buf[0]) |
87 |
strcpy(param[i].value, buf); |
88 |
if (!(*param[i].check)(param[i].value)) { |
89 |
fprintf(stderr, "%s: bad value for %s\n", |
90 |
param[i].value, param[i].name); |
91 |
continue; |
92 |
} |
93 |
i++; |
94 |
} |
95 |
compute(); |
96 |
} |
97 |
} |
98 |
|
99 |
|
100 |
typecheck(s) /* check lamp type */ |
101 |
char *s; |
102 |
{ |
103 |
lampcolor = matchlamp(s); |
104 |
return(lampcolor != NULL); |
105 |
} |
106 |
|
107 |
|
108 |
unitcheck(s) /* compute conversion to meters */ |
109 |
char *s; |
110 |
{ |
111 |
int len = strlen(s); |
112 |
|
113 |
switch (*s) { |
114 |
case 'm': |
115 |
if (strncmp(s, "meters", len)) |
116 |
return(0); |
117 |
unit2meter = 1.0; |
118 |
return(1); |
119 |
case 'c': |
120 |
if (strncmp(s, "centimeters", len) && strncmp(s, "cms", len)) |
121 |
return(0); |
122 |
unit2meter = 0.01; |
123 |
return(1); |
124 |
case 'f': |
125 |
if (strncmp(s, "foot", len) && strncmp(s, "feet", len)) |
126 |
return(0); |
127 |
unit2meter = 0.3048; |
128 |
return(1); |
129 |
case 'i': |
130 |
if (strncmp(s, "inches", len)) |
131 |
return(0); |
132 |
unit2meter = 0.0254; |
133 |
return(1); |
134 |
} |
135 |
return(0); |
136 |
} |
137 |
|
138 |
|
139 |
geomcheck(s) /* check/set lamp geometry */ |
140 |
char *s; |
141 |
{ |
142 |
int len = strlen(s); |
143 |
|
144 |
switch (*s) { |
145 |
case 'p': |
146 |
if (strncmp(s, "polygonal", len)) |
147 |
return(0); |
148 |
return(getpolygon()); |
149 |
case 's': |
150 |
if (strncmp(s, "sphere", len) && strncmp(s, "spherical", len)) |
151 |
return(0); |
152 |
return(getsphere()); |
153 |
case 'c': |
154 |
if (strncmp(s,"cylinder",len) && strncmp(s,"cylindrical",len)) |
155 |
return(0); |
156 |
return(getcylinder()); |
157 |
case 'r': |
158 |
if (strncmp(s, "ring", len) && strncmp(s, "disk", len)) |
159 |
return(0); |
160 |
return(getring()); |
161 |
} |
162 |
return(0); |
163 |
} |
164 |
|
165 |
|
166 |
outpcheck(s) /* check lumen output value */ |
167 |
register char *s; |
168 |
{ |
169 |
if ((*s < '0' || *s > '9') && *s != '.') |
170 |
return(0); |
171 |
lumens = atof(s); |
172 |
return(1); |
173 |
} |
174 |
|
175 |
|
176 |
compute() /* compute lamp radiance */ |
177 |
{ |
178 |
double whiteval; |
179 |
|
180 |
whiteval = lumens/area/(WHTEFFICACY*PI); |
181 |
|
182 |
printf("Lamp color (RGB) = %f %f %f\n", |
183 |
lampcolor[0]*whiteval, |
184 |
lampcolor[1]*whiteval, |
185 |
lampcolor[2]*whiteval); |
186 |
} |
187 |
|
188 |
|
189 |
getd(name, dp, help) /* get a positive double from stdin */ |
190 |
char *name; |
191 |
double *dp; |
192 |
char *help; |
193 |
{ |
194 |
char buf[32]; |
195 |
again: |
196 |
printf("%s [%g]: ", name, *dp); |
197 |
if (gets(buf) == NULL) |
198 |
return(0); |
199 |
if (buf[0] == '?') { |
200 |
puts(help); |
201 |
goto again; |
202 |
} |
203 |
if ((buf[0] < '0' || buf[0] > '9') && buf[0] != '.') |
204 |
return(0); |
205 |
*dp = atof(buf); |
206 |
return(1); |
207 |
} |
208 |
|
209 |
|
210 |
getpolygon() /* get projected area for a polygon */ |
211 |
{ |
212 |
static double parea = 1.0; |
213 |
|
214 |
getd("Polygon area", &parea, |
215 |
"Enter the total radiating area of the polygon."); |
216 |
area = unit2meter*unit2meter * parea; |
217 |
return(1); |
218 |
} |
219 |
|
220 |
|
221 |
getsphere() /* get projected area for a sphere */ |
222 |
{ |
223 |
static double radius = 1.0; |
224 |
|
225 |
getd("Sphere radius", &radius, |
226 |
"Enter the distance from the sphere's center to its surface."); |
227 |
area = 4.*PI*unit2meter*unit2meter * radius*radius; |
228 |
return(1); |
229 |
} |
230 |
|
231 |
|
232 |
getcylinder() /* get projected area for a cylinder */ |
233 |
{ |
234 |
static double length = 1.0, radius = 0.1; |
235 |
|
236 |
getd("Cylinder length", &length, |
237 |
"Enter the length of the cylinder."); |
238 |
getd("Cylinder radius", &radius, |
239 |
"Enter the distance from the cylinder's axis to its surface."); |
240 |
area = 2.*PI*unit2meter*unit2meter * radius*length; |
241 |
return(1); |
242 |
} |
243 |
|
244 |
|
245 |
getring() /* get projected area for a ring */ |
246 |
{ |
247 |
static double radius = 1.0; |
248 |
|
249 |
getd("Disk radius", &radius, |
250 |
"Enter the distance from the ring's center to its outer edge.\n\ |
251 |
The inner radius must be zero."); |
252 |
area = PI*unit2meter*unit2meter * radius*radius; |
253 |
return(1); |
254 |
} |