private void rotate() {
final Coordinate c = randomNormal();
final Piece piece = pieces[c.getY()][c.getX()];
if (piece.getType() == PieceType.NORMAL) {
piece.rotate((int) GaUtil.random(1, 3));
}
}
private Direction randomDirection() {
final int ordinal = (int) GaUtil.random(0, 3);
for (final Direction direction : Direction.values()) {
if (direction.ordinal() == ordinal) {
return direction;
}
}
throw new IllegalStateException();
}
private Coordinate randomBorder() {
final int number = (int) GaUtil.random(1, boardSize - 2);
return directionCoordinate(number, randomDirection());
}
private Coordinate randomNormal() {
final int x = (int) GaUtil.random(1, boardSize - 2);
final int y = (int) GaUtil.random(1, boardSize - 2);
return Coordinate.from(x, y);
}
