Question

在使用JFrame的绘画时，我的显示闪烁很多。我不能让它停止，我很想知道如何让它停止闪烁。我也尝试在这里添加swing.timer，但它仍然没有做任何事情。包游戏;

public class Play extends JFrame implements MouseMotionListener, MouseListener, KeyListener, ActionListener {

    private int _xPad,_yPad,_xdir,_ydir;
    private Brick[][] _bricks;
    private Ball _gameBall;
    private Timer _timer;

    public Play(int[][] board){
        super("Elemental Brick Breaker");
        _xdir = 0;
        _ydir = 0;
        _xPad = 350;
        _yPad = 500;
        _timer = new Timer(1000,this);
        _timer.start();
        _gameBall = new FireBall(_xPad,_yPad);
        _bricks = new Brick[8][10];
        int x = 75, y = 40;
        for(int i = 0 ; i < 8 ; i++) {
            for(int j = 0 ; j < 10 ; j++) {
                _bricks[i][j] = new FireBrick(x,y);
                x = x + 65;
                }
            y = y + 25;
            x = 75;
        }
    }

    public void paint(Graphics g) {
        super.paint(g);
        g.fillRect(_xPad, _yPad, 120, 10);
        for(int i = 0 ; i < 8 ; i++) {
            for(int j = 0 ; j < 10 ; j++) {
                g.fillRect(_bricks[i][j].getX(), _bricks[i][j].getY() , 60, 20);
                }
        }
    }

    @Override
    public void actionPerformed(ActionEvent arg0) {
        // TODO Auto-generated method stub

    }
}

Answer 1

请勿覆盖paint或update。绘画应使用轻量级组件完成并覆盖其paintComponent方法。例如：

public class MyPanel extends JPanel{
    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        //custom painting
    }
}
//elsewhere in your code - add the JPanel to the JFrame
MyPanel myPanel = new MyPanel();
JFrame frame = new JFrame();
frame.add(myPanel );

如果您希望重新绘制某种类型的事件，请在实例上调用重绘。例如，在ActionListener的实现中：

@Override
public void actionPerformed(ActionEvent e){
    myPanel.repaint();
}

Answer 2

在你的绘画方法中，做

Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

Answer 3

您可以尝试这种方法：

有一个单独的图像来绘制内容：

im=createImage(getWidth(), getHeight());

在构造函数中。

然后在油漆中：

Graphics g2=im.getGraphics();

并在g2上应用所有重命名为g的命令：

g2.fillRect etc

然后在g：

上绘制图像

g.drawImage(im, 0, 0, this);

简而言之：

public void paint(Graphics g) {
    Graphics g2=im.getGraphics();
    g2.fillRect(_xPad, _yPad, 120, 10);
    for(int i = 0 ; i < 8 ; i++) {
        for(int j = 0 ; j < 10 ; j++) {
            g2.fillRect(_bricks[i][j].getX(), _bricks[i][j].getY() , 60, 20);
            }

    g.drawImage(im, 0, 0, this);
    }
}

并有更新方法：

public void update(Graphics g) { paint(g); }

-

我已经简化了你的课程如下： - 它不会产生闪烁 - 如果我把它放回原处就会产生闪烁。

class Play extends JFrame implements ActionListener {

private int _xPad,_yPad,_xdir,_ydir;
private Rectangle[][] _bricks;
//    private Ball _gameBall;
private javax.swing.Timer _timer;
Image im;

public Play(){
    super("Elemental Brick Breaker");
    setSize(1000, 500);
    _xdir = 0;
    _ydir = 0;
    _xPad = 350;
    _yPad = 500;
    _timer = new javax.swing.Timer(1000,this);
    _timer.start();
//        _gameBall = new FireBall(_xPad,_yPad);
    _bricks = new Rectangle[8][10];
    int x = 75, y = 40;
    for(int i = 0 ; i < 8 ; i++) {
        for(int j = 0 ; j < 10 ; j++) {
            _bricks[i][j] = new Rectangle(x,y, 60, 20);
            x = x + 65;
            }
        y = y + 25;
        x = 75;
    }
    setVisible(true);
    im=createImage(getWidth(), getHeight());
}

public void paint(Graphics g) {
    Graphics g2=im.getGraphics();
    g2.fillRect(_xPad, _yPad, 120, 10);
    for(int i = 0 ; i < 8 ; i++) {
        for(int j = 0 ; j < 10 ; j++) {
            g2.fillRect(_bricks[i][j].x, _bricks[i][j].y , 60, 20);
            }
    }
    g.drawImage(im, 0, 0, this);
}

public void update(Graphics g) { paint(g); }

@Override
public void actionPerformed(ActionEvent arg0) {
    // TODO Auto-generated method stub
  repaint();
  System.out.println("t");
}
}

Java JFrame绘制方法显示闪烁

3 个答案: