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#ifndef lint |
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static const char RCSid[] = "$Id: colorscale.c,v 2.4 2003/02/22 02:07:27 greg 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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|
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#include <stdio.h> |
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|
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#include <math.h> |
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|
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#include "color.h" |
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|
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int primary = -1; |
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double prival = 0.0; |
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|
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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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|
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|
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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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|
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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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|
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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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|
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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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|
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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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} |
