问摆动落地块

EN

public class GridPanel extends JPanel{

    private GridCell[][] grid;
    private static final int DEFAULT_SIZE = 25;
    private static final Color[] COLORS = {Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW};
    private Random random;


    public GridPanel(int x, int y){
        random = new Random();
        grid = new GridCell[x][y];
        GridBagConstraints gbc = new GridBagConstraints();
        setLayout(new GridBagLayout());
        for(int i = 0; i < grid.length; i++){
            for(int j = 0; j < grid[i].length; j++){
                GridCell gc = new GridCell(i, j, DEFAULT_SIZE);
                Border border = new MatteBorder(1, 1, 1, 1, Color.GRAY);
                gc.setBorder(border);
                gc.setBackground(COLORS[random.nextInt(COLORS.length)]);
                gbc.gridx = i;
                gbc.gridy = j;
                add(gc, gbc);
                grid[i][j] = gc;
            }
        }
    }
}

public class GridCell extends JPanel{

private int x;
private int y;
private int size;

public GridCell(int x, int y, int size){
    this.x = x;
    this.y = y;
    this.size = size;
}

@Override
public Dimension getPreferredSize() {
    return new Dimension(size, size);
}

public GridCoordinate getCoordinates(){
    return new GridCoordinate(x, y);
}

public int getCellSize(){
    return this.size;
}

}