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#ifndef lint
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static const char RCSid[] = "$Id: colorscale.c,v 2.5 2004/03/28 20:33:13 schorsch Exp $";
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#endif
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/*
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* colorscale.c - program to produce color pallets
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*
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* 9/9/87
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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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int primary = -1;
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double prival = 0.0;
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static void colorscale(void);
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static void printargs(int ac, char **av, FILE *fp);
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int
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main(
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int argc,
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char *argv[]
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)
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{
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int i;
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for (i = 1; i < argc && argv[i][0] == '-'; i++)
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switch (argv[i][1]) {
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case 'r':
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primary = RED;
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prival = atof(argv[++i]);
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break;
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case 'g':
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primary = GRN;
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prival = atof(argv[++i]);
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break;
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case 'b':
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primary = BLU;
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prival = atof(argv[++i]);
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break;
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default:
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goto userr;
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}
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if (primary < 0 || i < argc)
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goto userr;
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printargs(argc, argv, stdout);
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printf("\n");
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printf("-Y 256 +X 256\n");
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colorscale();
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exit(0);
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userr:
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fprintf(stderr, "Usage: %s -r|-g|-b value\n", argv[0]);
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exit(1);
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}
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static void
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colorscale(void) /* output our color scale */
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{
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COLOR scanline[256];
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int j;
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register int i;
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for (j = 256-1; j >= 0; j--) {
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for (i = 0; i < 256; i++)
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switch (primary) {
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case RED:
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setcolor(scanline[i],prival,i/256.0,j/256.0);
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break;
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case GRN:
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setcolor(scanline[i],i/256.0,prival,j/256.0);
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break;
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case BLU:
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setcolor(scanline[i],i/256.0,j/256.0,prival);
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break;
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}
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if (fwritescan(scanline, 256, stdout) < 0)
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goto writerr;
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}
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return;
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writerr:
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fprintf(stderr, "write error in colorscale\n");
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exit(1);
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}
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static void
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printargs( /* print arguments to a file */
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int ac,
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char **av,
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FILE *fp
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)
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{
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while (ac-- > 0) {
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fputs(*av++, fp);
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putc(' ', fp);
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}
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putc('\n', fp);
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}
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