plugins/libwmfun/wave.c

   1 /*
   2  *  libwmfun - WindowMaker texture function library
   3  *  Copyright (C) 1999 Tobias Gloth
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  18  *  USA.
  19  */
  20
  21 /*
  22  * $Id$
  23  *
  24  * $Log$
  25  * Revision 1.1  2000/12/03 18:58:41  id
  26  * initiate plugins branch
  27  *
  28  * Revision 1.1.1.1  1999/02/21 17:16:47  gloth
  29  * initial revision
  30  *
  31  */
  32
  33 #include "getopt.h"
  34 #include <math.h>
  35 #include <stdlib.h>
  36 #include <time.h>
  37 #include "generic.h"
  38
  39 RImage *waves(int argc, char **argv, int width, int height, int relief)
  40 {
  41
  42         int i, j, k, done, sine[256];
  43         int from[3] = { 0x00, 0x00, 0x00 };
  44         int to[3] = { 0xff, 0xff, 0xff };
  45         int layers, range, dx[1000], dy[1000];
  46         RImage *image;
  47         unsigned char *cptr;
  48
  49         int option_index = 0;
  50         int c;
  51
  52         optind = 1;
  53         for (done = 0; !done;) {
  54                 static struct option long_options[] = {
  55                         {"from", 1, 0, 'f'},
  56                         {"to", 1, 0, 't'},
  57                         {0, 0, 0, 0}
  58                 };
  59
  60                 c = getopt_long(argc, argv, "f:t:", long_options, &option_index);
  61                 if (c == -1) {
  62                         break;
  63                 }
  64
  65                 switch (c) {
  66                 case 'f':
  67                         if (!parse_color(optarg, from)) {
  68                                 error("invalid color: %s\n", optarg);
  69                                 return 0;
  70                         }
  71                         break;
  72                 case 't':
  73                         if (!parse_color(optarg, to)) {
  74                                 error("invalid color: %s\n", optarg);
  75                                 return 0;
  76                         }
  77                         break;
  78                 default:
  79                         done = 1;
  80                         break;
  81                 }
  82         }
  83
  84         argc -= optind;
  85         argv += optind;
  86
  87         if (!start_image("waves", argc, 2, 3, width, height, &image)) {
  88                 return (RImage *) 0;
  89         }
  90
  91         layers = atoi(argv[0]);
  92         range = atoi(argv[1]);
  93
  94         if (layers <= 0) {
  95                 layers = 1;
  96         }
  97         if (layers > 256) {
  98                 layers = 256;
  99         }
 100
 101         if (range <= 0) {
 102                 range = 1;
 103         }
 104
 105         for (i = 0; i < 256; i++) {
 106                 sine[i] = (int)(127.0 * sin(2.0 * M_PI * i / 256)) + 128;
 107         }
 108
 109         srand(time(0));
 110
 111         for (i = 0; i < layers; i++) {
 112                 dx[i] = random_int(range) - range / 2;
 113                 dy[i] = random_int(range) - range / 2;
 114         }
 115
 116         cptr = image->data;
 117         for (i = 0; i < height; i++) {
 118                 for (j = 0; j < width; j++) {
 119                         int output[3], value = 0;
 120                         for (k = 0; k < layers; k++) {
 121                                 value += sine[(j * dx[k] + i * dy[k]) & 255];
 122                         }
 123                         interpolate_color(output, from, to, value / layers);
 124                         *cptr++ = output[0];
 125                         *cptr++ = output[1];
 126                         *cptr++ = output[2];
 127                         if (RRGBAFormat == image->format)
 128                                 cptr++;
 129                 }
 130         }
 131
 132         return image;
 133 }