games/colorbars/colorbars.c

   1 /*      $NetBSD: colorbars.c,v 1.1 2012/06/06 00:13:36 christos Exp $   */
   2
   3 /*-
   4  * Copyright (c) 2012 Nathanial Sloss <nathanialsloss@yahoo.com.au>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 #include <sys/cdefs.h>
  29 __RCSID("$NetBSD: colorbars.c,v 1.1 2012/06/06 00:13:36 christos Exp $");
  30
  31 #include <curses.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <err.h>
  35 #include <stdlib.h>
  36
  37 int
  38 main(void)
  39 {
  40         static struct colorInfo {
  41                 const char *name;
  42                 int color;
  43         } colorInfo[] = {
  44                 { "Black", COLOR_BLACK },
  45                 { "Red", COLOR_RED },
  46                 { "Green", COLOR_GREEN },
  47                 { "Yellow", COLOR_YELLOW },
  48                 { "Blue", COLOR_BLUE },
  49                 { "Magenta", COLOR_MAGENTA },
  50                 { "Cyan", COLOR_CYAN },
  51                 { "White", COLOR_WHITE },
  52         };
  53         size_t lengths[__arraycount(colorInfo)];
  54
  55         static const size_t numcolors = __arraycount(colorInfo);
  56         size_t labelwidth;
  57
  58         int colorOK;
  59         int spacing, offsetx, labeloffsety, labeloffsetx;
  60
  61         if (!initscr())
  62                 errx(EXIT_FAILURE, "Cannot initialize curses");
  63
  64         colorOK = has_colors();
  65         if (!colorOK) {
  66                 endwin();
  67                 errx(EXIT_FAILURE, "Terminal cannot display color");
  68         }
  69
  70         if (COLS < 45 || LINES < 10) {
  71                 endwin();
  72                 errx(EXIT_FAILURE, "Terminal size must be at least 45x10.");
  73         }
  74
  75         spacing = COLS / numcolors;
  76         offsetx = (COLS - (spacing * numcolors)) / 2;
  77
  78
  79         start_color();
  80
  81         labelwidth = 0;
  82         for (size_t i = 0; i < numcolors; i++) {
  83                 lengths[i] = strlen(colorInfo[i].name);
  84                 if (lengths[i] > labelwidth)
  85                         labelwidth = lengths[i];
  86                 init_pair(i, COLOR_WHITE, colorInfo[i].color);
  87         }
  88
  89         labeloffsetx = spacing / 2;
  90         labeloffsety = (LINES - 1 - labelwidth) / 2;
  91         clear();
  92
  93         move(0, 0);
  94
  95         for (size_t i = 0; i < numcolors; i++) {
  96                 int xoffs = offsetx + spacing * i;
  97
  98                 attrset(COLOR_PAIR(i));
  99
 100                 for (int line = 0; line < LINES - 1; line++)
 101                         for (int xpos = 0; xpos < spacing; xpos++)
 102                                mvprintw(line, xoffs + xpos, " ");
 103
 104                 attrset(COLOR_PAIR(0));
 105
 106                 xoffs += labeloffsetx;
 107                 for (size_t line = 0; line < lengths[i]; line++)
 108                         mvprintw(line + labeloffsety, xoffs, "%c",
 109                             colorInfo[i].name[line]);
 110         }
 111
 112         attrset(COLOR_PAIR(0));
 113
 114         mvprintw(LINES - 1, 0, "ANSI Color chart - Press any key to exit: ");
 115
 116         refresh();
 117
 118         getch();
 119
 120         endwin();
 121
 122         return EXIT_SUCCESS;
 123 }
 124