@Override
public boolean makeValidMove(int a, int b) {
if (_game.get(a, b) != null && _game.get(a, b).color() == _color) {
return false;
} else if (a + b == _x + _y) {
int dir = (a - _x) / Math.abs(a - _x);
for (int i = _x + dir, j = _y - dir; i != a; i += dir, j -= dir) {
if (_game.get(i, j) != null) {
return false;
}
}
Move move = new SingleMove(this, _x, _y, _game.get(a, b), a, b);
return makeMoveCareful(move);
} else if (a - b == _x - _y) {
int dir = (a - _x) / Math.abs(a - _x);
for (int i = _x + dir, j = _y + dir; i != a; i += dir, j += dir) {
if (_game.get(i, j) != null) {
return false;
}
}
Move move = new SingleMove(this, _x, _y, _game.get(a, b), a, b);
return makeMoveCareful(move);
} else if (a == _x) {
int dir = (b - _y) / Math.abs(b - _y);
for (int i = _y + dir; i != b; i += dir) {
if (_game.get(_x, i) != null) {
return false;
}
}
Move move = new SingleMove(this, _x, _y, _game.get(a, b), a, b);
return makeMoveCareful(move);
} else if (b == _y) {
int dir = (a - _x) / Math.abs(a - _x);
for (int i = _x + dir; i != a; i += dir) {
if (_game.get(i, _y) != null) {
return false;
}
}
Move move = new SingleMove(this, _x, _y, _game.get(a, b), a, b);
return makeMoveCareful(move);
} else {
return false;
}
}
@Override
public boolean canCapture(int a, int b) {
if (a + b == _x + _y) {
int dir = (a - _x) / Math.abs(a - _x);
for (int i = _x + dir, j = _y - dir; i != a; i += dir, j -= dir) {
if (_game.get(i, j) != null) {
return false;
}
}
return true;
} else if (a - b == _x - _y) {
int dir = (a - _x) / Math.abs(a - _x);
for (int i = _x + dir, j = _y + dir; i != a; i += dir, j += dir) {
if (_game.get(i, j) != null) {
return false;
}
}
return true;
} else if (a == _x) {
int dir = (b - _y) / Math.abs(b - _y);
for (int i = _y + dir; i != b; i += dir) {
if (_game.get(_x, i) != null) {
return false;
}
}
return true;
} else if (b == _y) {
int dir = (a - _x) / Math.abs(a - _x);
for (int i = _x + dir; i != a; i += dir) {
if (_game.get(i, _y) != null) {
return false;
}
}
return true;
} else {
return false;
}
}