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/***
This file is part of Let's play gomoku!
Copyright (C) 2021 Aleksandr D. Goncharov (Joursoir) <chat@joursoir.net>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
***/
#include "GameField.hpp"
GameField::GameField(int a_rows, int a_cols, int a_lwin)
: rows(a_rows), cols(a_cols), win_length(a_lwin), state(G_NONE),
who_move(G_XPLAYER)
{
int r, c;
field = new int*[rows];
for(r = 0; r < rows; r++) {
field[r] = new int[cols];
for(c = 0; c < cols; c++) {
field[r][c] = G_EMPTY;
}
}
free_fields = rows * cols;
}
GameField::GameField(const GameField& a)
{
int r, c;
rows = a.rows;
cols = a.cols;
free_fields = a.free_fields;
win_length = a.win_length;
state = a.state;
who_move = a.who_move;
field = new int*[rows];
for(r = 0; r < rows; r++) {
field[r] = new int[cols];
for(c = 0; c < cols; c++) {
field[r][c] = a.field[r][c];
}
}
}
GameField::~GameField()
{
if(field) {
int r;
for(r = 0; r < rows; r++) {
delete[] field[r];
}
delete[] field;
}
}
bool GameField::CanMove(int y, int x)
{
if(field[y][x] != G_EMPTY)
return false;
return true;
}
void GameField::Move(int y, int x)
{
field[y][x] = who_move;
who_move = -who_move; // change player
free_fields--;
UpdateState(y, x);
}
void GameField::UndoMove(int y, int x)
{
who_move = field[y][x];
field[y][x] = G_EMPTY;
free_fields++;
UpdateState(y, x);
}
void GameField::UpdateState(int y, int x)
{
if((state = ScanRowsAround(y, x)) != G_NONE)
return;
if((state = ScanColsAround(y, x)) != G_NONE)
return;
if((state = ScanDiagsAround(y, x)) != G_NONE)
return;
if(!free_fields) {
state = G_DRAW;
return;
}
}
int GameField::ScanRowsAround(int y, int x)
{
int i, n;
int player = field[y][x];
// ray to left
for(i = x, n = 0; i >= 0; i--) {
if(player == field[y][i]) {
n++;
if(n == win_length)
return player;
}
else break;
}
// ray to right
for(i = x, n -= 1; i < cols; i++) {
if(player == field[y][i]) {
n++;
if(n == win_length)
return player;
}
else break;
}
return G_NONE;
}
int GameField::ScanColsAround(int y, int x)
{
int i, n;
int player = field[y][x];
// ray to up
for(i = y, n = 0; i >= 0; i--) {
if(player == field[i][x]) {
n++;
if(n == win_length)
return player;
}
else break;
}
// ray to down
for(i = y, n -= 1; i < rows; i++) {
if(player == field[i][x]) {
n++;
if(n == win_length)
return player;
}
else break;
}
return G_NONE;
}
int GameField::ScanDiagsAround(int y, int x)
{
int i, j, n;
int player = field[y][x];
// ray to left up corner
for(i = x, j = y, n = 0; i >= 0 && j >= 0; i--, j--) {
if(player == field[j][i]) {
n++;
if(n == win_length)
return player;
}
else break;
}
// ray to right down corner
for(i = x, j = y, n -= 1; i < cols && j < rows; i++, j++) {
if(player == field[j][i]) {
n++;
if(n == win_length)
return player;
}
else break;
}
/* change the diagonal */
// ray to right up corner
for(i = x, j = y, n = 0; i < cols && j >= 0; i++, j--) {
if(player == field[j][i]) {
n++;
if(n == win_length)
return player;
}
else break;
}
// ray to left down cornet
for(i = x, j = y, n -= 1; i >= 0 && j < rows; i--, j++) {
if(player == field[j][i]) {
n++;
if(n == win_length)
return player;
}
else break;
}
return G_NONE;
}
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