2 * Copyright (C) 2009 Carl Worth
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.
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.
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/ .
17 * Author: Carl Worth <cworth@cworth.org>
26 #include "dvonn-board.h"
28 /* Just a diagram to help start thinking about data structures:
33 * 2 ○ ● ● ○ ○ ○ ○ ○ ○ ○
34 * 3 ○ ● ○ ● ○ ○ ○ ○ ○ ○ ○
35 * 4 ○ ● ● ○ ○ ○ ○ ○ ○ ○ K
36 * 5 ○ ○ ○ ○ ○ ○ ○ ○ ○ J
41 * 1 x x ○ ○ ○ ○ ○ ○ ○ ○ ○
42 * 2 x ○ ● ● ○ ○ ○ ○ ○ ○ ○
43 * 3 ○ ● ○ ● ○ ○ ○ ○ ○ ○ ○
44 * 4 ○ ● ● ○ ○ ○ ○ ○ ○ ○ x
45 * 5 ○ ○ ○ ○ ○ ○ ○ ○ ○ x x
46 * A B C D E F G H I J K
48 * With connections as:
58 dvonn_board_init (dvonn_board_t *board)
62 for (x = 0; x < DVONN_BOARD_X_SIZE; x++) {
63 for (y = 0; y < DVONN_BOARD_Y_SIZE; y++) {
64 board->cells[x][y].type = DVONN_CELL_EMPTY;
65 board->cells[x][y].height = 0;
66 board->cells[x][y].contains_red = FALSE;
70 /* Cut out the unplayable "corners" of the board. */
71 for (x = 0; x < DVONN_BOARD_Y_SIZE / 2; x++) {
72 for (y = 0; y < (DVONN_BOARD_Y_SIZE / 2) - x; y++) {
73 board->cells[x][y].type = DVONN_CELL_INVALID;
75 [DVONN_BOARD_X_SIZE-1-x]
76 [DVONN_BOARD_Y_SIZE-1-y].type = DVONN_CELL_INVALID;
80 board->phase = DVONN_PHASE_PLACEMENT;
81 board->player = DVONN_PLAYER_WHITE;
86 dvonn_board_move_legal (dvonn_board_t *board,
91 if (x1 < 0 || x1 >= DVONN_BOARD_X_SIZE ||
92 y1 < 0 || y1 >= DVONN_BOARD_Y_SIZE ||
93 x2 < 0 || x2 >= DVONN_BOARD_X_SIZE ||
94 y2 < 0 || y2 >= DVONN_BOARD_Y_SIZE)
96 *error = "Invalid coordinates (not on board)";
100 if (board->cells[x1][y1].type == DVONN_CELL_INVALID) {
101 *error = "Not a valid board space";
105 if (board->cells[x1][y1].type == DVONN_CELL_EMPTY) {
106 *error = "There is no piece there to move";
110 if (board->cells[x1][y1].type != board->player) {
111 *error = "You cannot move your opponent's piece";
115 /* XXX: Need to code up DVONN-legal move calculation here. */
121 dvonn_board_next_player (dvonn_board_t *board)
123 if (board->player == DVONN_PLAYER_BLACK)
124 board->player = DVONN_PLAYER_WHITE;
126 board->player = DVONN_PLAYER_BLACK;
130 dvonn_board_place (dvonn_board_t *board,
134 if (board->phase != DVONN_PHASE_PLACEMENT) {
135 *error = "Cannot place outside of placement phase";
139 if (board->cells[x][y].type != DVONN_CELL_EMPTY) {
140 *error = "Cannot place on an occupied space";
144 if (board->moves < 3) {
145 board->cells[x][y].type = DVONN_CELL_RED;
146 board->cells[x][y].contains_red = TRUE;
147 } else if (board->moves % 2) {
148 board->cells[x][y].type = DVONN_CELL_BLACK;
150 board->cells[x][y].type = DVONN_CELL_WHITE;
153 board->cells[x][y].height = 1;
157 if (board->moves == 49) {
158 board->phase = DVONN_PHASE_MOVEMENT;
166 dvonn_board_move (dvonn_board_t *board,
171 if (board->phase != DVONN_PHASE_MOVEMENT) {
172 *error = "Cannot move outside of placement phase";
176 if (! dvonn_board_move_legal (board, x1, y1, x2, y2, error))
179 board->cells[x2][y2].height += board->cells[x1][y1].height;
180 board->cells[x2][y2].type = board->cells[x1][y1].type;
181 board->cells[x2][y2].contains_red |= board->cells[x1][y1].contains_red;
183 board->cells[x1][y1].type = DVONN_CELL_EMPTY;
184 board->cells[x1][y1].height = 0;
185 board->cells[x1][y1].contains_red = FALSE;
187 dvonn_board_next_player (board);