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#include "GameField.hpp"
GameField::GameField(int a_cols, int a_rows, int a_lwin)
: cols(a_cols), rows(a_rows), win_length(a_lwin), state(G_NONE),
who_move(G_XPLAYER)
{
int c, r;
field = new int*[cols];
for(c = 0; c < cols; c++) {
field[c] = new int[rows];
for(r = 0; r < rows; r++) {
field[c][r] = G_EMPTY;
}
}
free_fields = cols * rows;
}
GameField::~GameField()
{
if(field) {
int c;
for(c = 0; c < cols; c++) {
delete[] field[c];
}
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::UpdateState(int y, int x)
{
if(!free_fields) {
state = G_DRAW;
return;
}
if((state = ScanRowsAround(y, x)) != G_NONE)
return;
if((state = ScanColsAround(y, x)) != G_NONE)
return;
if((state = ScanDiagsAround(y, x)) != G_NONE)
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 < rows; 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 < cols; 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 < rows && j < cols; 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 < rows && 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 < cols; i--, j++) {
if(player == field[j][i]) {
n++;
if(n == win_length)
return player;
}
else break;
}
return G_NONE;
}
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