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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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static const char RCSid[] = "$Id$"; |
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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 <math.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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float *lampcolor; /* the lamp color (RGB) */ |
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double unit2meter; /* conversion from units to meters */ |
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double projarea; /* projected area for this geometry */ |
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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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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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{ "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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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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{ "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 15 for incandescent fixtures or 40\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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{ |
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double whiteval; |
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whiteval = lumens/470./projarea; |
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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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} |
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getd(dp) /* get a positive double from stdin */ |
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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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getpolygon() /* get projected area for a polygon */ |
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{ |
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printf("Enter area of polygon: "); |
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if (!getd(&projarea)) |
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return(0); |
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projarea *= unit2meter*unit2meter; |
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projarea *= PI; |
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static double parea = 1.0; |
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getd("Polygon area", &parea, |
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"Enter the total radiating area of the polygon."); |
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area = unit2meter*unit2meter * parea; |
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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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double radius; |
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static double radius = 1.0; |
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printf("Enter sphere radius: "); |
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if (!getd(&radius)) |
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return(0); |
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radius *= unit2meter; |
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projarea = 4.*PI*PI*radius*radius; |
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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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double length, radius; |
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static double length = 1.0, radius = 0.1; |
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printf("Enter cylinder length: "); |
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if (!getd(&length)) |
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return(0); |
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length *= unit2meter; |
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printf("Enter cylinder radius: "); |
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if (!getd(&radius)) |
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return(0); |
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radius *= unit2meter; |
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projarea = PI*PI*2.*PI*radius*length; |
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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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double radius; |
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static double radius = 1.0; |
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printf("Enter disk radius: "); |
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if (!getd(&radius)) |
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return(0); |
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radius *= unit2meter; |
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projarea = PI*PI*radius*radius; |
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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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} |
