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 <curses.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <err.h>
  32 #include <stdlib.h>
  33
  34 int
  35 main(void)
  36 {
  37         static struct colorInfo {
  38                 const char *name;
  39                 int color;
  40         } colorInfo[] = {
  41                 { "Black", COLOR_BLACK },
  42                 { "Red", COLOR_RED },
  43                 { "Green", COLOR_GREEN },
  44                 { "Yellow", COLOR_YELLOW },
  45                 { "Blue", COLOR_BLUE },
  46                 { "Magenta", COLOR_MAGENTA },
  47                 { "Cyan", COLOR_CYAN },
  48                 { "White", COLOR_WHITE },
  49         };
  50         size_t lengths[__arysize(colorInfo)];
  51
  52         static const size_t numcolors = __arysize(colorInfo);
  53         size_t labelwidth;
  54
  55         int colorOK;
  56         int spacing, offsetx, labeloffsety, labeloffsetx;
  57
  58         if (!initscr())
  59                 errx(EXIT_FAILURE, "Cannot initialize curses");
  60
  61         colorOK = has_colors();
  62         if (!colorOK) {
  63                 endwin();
  64                 errx(EXIT_FAILURE, "Terminal cannot display color");
  65         }
  66
  67         if (COLS < 45 || LINES < 10) {
  68                 endwin();
  69                 errx(EXIT_FAILURE, "Terminal size must be at least 45x10.");
  70         }
  71
  72         spacing = COLS / numcolors;
  73         offsetx = (COLS - (spacing * numcolors)) / 2;
  74
  75
  76         start_color();
  77
  78         labelwidth = 0;
  79         for (size_t i = 0; i < numcolors; i++) {
  80                 lengths[i] = strlen(colorInfo[i].name);
  81                 if (lengths[i] > labelwidth)
  82                         labelwidth = lengths[i];
  83                 init_pair(i, COLOR_WHITE, colorInfo[i].color);
  84         }
  85
  86         labeloffsetx = spacing / 2;
  87         labeloffsety = (LINES - 1 - labelwidth) / 2;
  88         clear();
  89
  90         move(0, 0);
  91
  92         for (size_t i = 0; i < numcolors; i++) {
  93                 int xoffs = offsetx + spacing * i;
  94
  95                 attrset(COLOR_PAIR(i));
  96
  97                 for (int line = 0; line < LINES - 1; line++)
  98                         for (int xpos = 0; xpos < spacing; xpos++)
  99                                mvprintw(line, xoffs + xpos, " ");
 100
 101                 attrset(COLOR_PAIR(0));
 102
 103                 xoffs += labeloffsetx;
 104                 for (size_t line = 0; line < lengths[i]; line++)
 105                         mvprintw(line + labeloffsety, xoffs, "%c",
 106                             colorInfo[i].name[line]);
 107         }
 108
 109         attrset(COLOR_PAIR(0));
 110
 111         mvprintw(LINES - 1, 0, "ANSI Color chart - Press any key to exit: ");
 112
 113         refresh();
 114
 115         getch();
 116
 117         endwin();
 118
 119         return EXIT_SUCCESS;
 120 }