git.cworth.org Git - loa/blob - loa.c

   1 /*
   2  * Copyright (C) 2008 Carl Worth
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see http://www.gnu.org/licenses/ .
  16  *
  17  * Author: Carl Worth <cworth@cworth.org>
  18  */
  19
  20 #include <gtk/gtk.h>
  21 #include <math.h>
  22
  23 #include "loa-board.h"
  24
  25 #define BOARD_SIZE 8
  26
  27 typedef struct {
  28     int x_offset;
  29     int y_offset;
  30     int width;
  31     int height;
  32     int cell_size;
  33 } layout_t;
  34
  35 typedef struct {
  36     layout_t layout;
  37     loa_board_t board;
  38     loa_bool_t has_selected;
  39     int selected_x;
  40     int selected_y;
  41 } loa_game_t;
  42
  43 static gboolean
  44 on_delete_event_quit (GtkWidget  *widget,
  45                       GdkEvent   *event,
  46                       gpointer    user_data)
  47 {
  48     gtk_main_quit ();
  49
  50     /* Returning FALSE allows the default handler for delete-event
  51      * to proceed to cleanup the widget. */
  52     return FALSE;
  53 }
  54
  55 /* Something like buff */
  56 #define LIGHT_SQUARE_COLOR 0.89, 0.70, 0.40
  57 /* Something like mahogany */
  58 #define DARK_SQUARE_COLOR  0.26, 0.02, 0.01
  59
  60 static gboolean
  61 on_button_press_event (GtkWidget        *widget,
  62                        GdkEventButton   *event,
  63                        gpointer          user_data)
  64 {
  65     loa_game_t *game = user_data;
  66     layout_t *layout = &game->layout;
  67     int x, y;
  68     char *error;
  69
  70     x = (event->x - layout->x_offset) / layout->cell_size;
  71     y = (event->y - layout->y_offset) / layout->cell_size;
  72
  73     if (! game->has_selected) {
  74         if (game->board.cells[x][y] == game->board.player) {
  75             game->has_selected = TRUE;
  76             game->selected_x = x;
  77             game->selected_y = y;
  78             gtk_widget_queue_draw (widget);
  79         }
  80         return TRUE;
  81     }
  82
  83     /* Do nothing for out-of-bounds clicks */
  84     if (x < 0 || x >= LOA_BOARD_SIZE ||
  85         y < 0 || y >= LOA_BOARD_SIZE)
  86     {
  87         return TRUE;
  88     }
  89
  90     if (x == game->selected_x &&
  91         y == game->selected_y)
  92     {
  93         game->has_selected = FALSE;
  94         gtk_widget_queue_draw (widget);
  95         return TRUE;
  96     }
  97
  98     if (loa_board_move (&game->board,
  99                         game->selected_x, game->selected_y,
 100                         x, y, &error))
 101     {
 102         game->has_selected = FALSE;
 103         gtk_widget_queue_draw (widget);
 104         return TRUE;
 105     } else {
 106         printf ("Illegal move %c%d%c%d: %s\n",
 107                 'a' + game->selected_x,
 108                 LOA_BOARD_SIZE - game->selected_y,
 109                 'a' + x,
 110                 LOA_BOARD_SIZE - y,
 111                 error);
 112     }
 113
 114     return TRUE;
 115 }
 116
 117 static gboolean
 118 on_expose_event_draw (GtkWidget         *widget,
 119                       GdkEventExpose    *event,
 120                       gpointer           user_data)
 121 {
 122     loa_game_t *game = user_data;
 123     layout_t *layout = &game->layout;
 124     cairo_t *cr;
 125     int x, y;
 126
 127     if (layout->width != widget->allocation.width ||
 128         layout->height != widget->allocation.height)
 129     {
 130         int size;
 131
 132         layout->width = widget->allocation.width;
 133         layout->height = widget->allocation.height;
 134
 135         size = MIN (layout->width, layout->height);
 136         /* Size must be a multiple of the integer cell_size */
 137         layout->cell_size = size / BOARD_SIZE;
 138         size = layout->cell_size * BOARD_SIZE;
 139
 140         layout->x_offset = (layout->width - size) / 2;
 141         layout->y_offset = (layout->height - size) / 2;
 142     }
 143
 144     cr = gdk_cairo_create (widget->window);
 145
 146     cairo_translate (cr, layout->x_offset, layout->y_offset);
 147
 148     for (y = 0; y < BOARD_SIZE; y++) {
 149         for (x = 0; x < BOARD_SIZE; x++) {
 150             loa_cell_t cell;
 151             cairo_save (cr);
 152             cairo_translate(cr, x * layout->cell_size, y * layout->cell_size);
 153             if ((x + y) % 2 == 0)
 154                 cairo_set_source_rgb (cr, LIGHT_SQUARE_COLOR);
 155             else
 156                 cairo_set_source_rgb (cr, DARK_SQUARE_COLOR);
 157             cairo_rectangle (cr, 0, 0, layout->cell_size, layout->cell_size);
 158             cairo_fill (cr);
 159             cell = game->board.cells[x][y];
 160             if (cell != LOA_CELL_EMPTY) {
 161                 cairo_arc (cr,
 162                            layout->cell_size / 2.0, layout->cell_size / 2.0,
 163                            layout->cell_size / 2.5,
 164                            0, 2 * M_PI);
 165                 if (cell == LOA_CELL_BLACK)
 166                     cairo_set_source_rgb (cr, 0, 0, 0); /* black */
 167                 else
 168                     cairo_set_source_rgb (cr, 1, 1, 1); /* white */
 169                 cairo_fill_preserve (cr);
 170                 cairo_set_line_width (cr, 2.0);
 171                 if (cell == LOA_CELL_BLACK)
 172                     cairo_set_source_rgb (cr, LIGHT_SQUARE_COLOR);
 173                 else
 174                     cairo_set_source_rgb (cr, DARK_SQUARE_COLOR);
 175                 cairo_stroke (cr);
 176             }
 177             if (game->has_selected &&
 178                 x == game->selected_x &&
 179                 y == game->selected_y)
 180             {
 181                 cairo_arc (cr,
 182                            layout->cell_size / 2.0, layout->cell_size / 2.0,
 183                            layout->cell_size / 2.5,
 184                            0, 2 * M_PI);
 185                 cairo_set_source_rgba (cr, 0.2, 0.2, 1.0, 0.4);
 186                 cairo_fill (cr);
 187             }
 188             cairo_restore (cr);
 189         }
 190     }
 191
 192     cairo_destroy (cr);
 193
 194     return TRUE;
 195 }
 196
 197 static void
 198 loa_game_init (loa_game_t *game)
 199 {
 200     game->layout.width = 0;
 201     game->layout.height = 0;
 202
 203     game->has_selected = FALSE;
 204
 205     loa_board_init (&game->board);
 206 }
 207
 208 int
 209 main (int argc, char *argv[])
 210 {
 211     GtkWidget *window;
 212     GtkWidget *drawing_area;
 213     loa_game_t game;
 214
 215     loa_game_init (&game);
 216
 217     gtk_init (&argc, &argv);
 218
 219     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 220
 221     gtk_window_set_default_size (GTK_WINDOW (window), 256, 256);
 222
 223     g_signal_connect (window, "delete-event",
 224                       G_CALLBACK (on_delete_event_quit), NULL);
 225
 226     drawing_area = gtk_drawing_area_new ();
 227
 228     gtk_container_add (GTK_CONTAINER (window), drawing_area);
 229
 230     g_signal_connect (drawing_area, "expose-event",
 231                       G_CALLBACK (on_expose_event_draw), &game);
 232
 233     gtk_widget_add_events (drawing_area, GDK_BUTTON_PRESS_MASK);
 234     g_signal_connect (drawing_area, "button-press-event",
 235                       G_CALLBACK (on_button_press_event), &game);
 236
 237     gtk_widget_show_all (window);
 238
 239     gtk_main ();
 240
 241     return 0;
 242 }