具有缓冲策略的OS X上的JFrame禁用圆角

Question

我正在尝试在OS X中创建一个简单的JFrame窗口,并使用Graphics2d在其上呈现一个简单的黑色方块:

public Start() { 
    running = true;
    window = new JFrame("Finest Hour");
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setPreferredSize(new Dimension(500, 500));
    window.setSize(window.getPreferredSize());
    FullScreenUtilities.setWindowCanFullScreen(window, true);
    window.setIgnoreRepaint(true);
    window.setVisible(true);
    window.createBufferStrategy(2);
    strategy = window.getBufferStrategy();
}

public static void main(String[] args) {
    Start s = new Start();
    s.loop();
}

public void loop() {
    Random random = new Random();
    while(running) {
        Graphics2D g = (Graphics2D) strategy.getDrawGraphics();
        g.setColor(Color.black);
        g.fillRect(20, 20, 40, 40);
        strategy.show();
    }
}

然而,当我使用strategy.show()时,窗口似乎在底部没有圆角.:

在没有缓冲策略的情况下渲染它,即:Graphics2D =(Graphics2D)window.getGraphics(); 生产一个圆角窗口:

我知道这是一个非常小的问题,但它仍然很烦人.有任何解决这个问题的方法吗？

Answer 1

对我来说效果很好。

public class TestMacFrame extends JFrame {

    public TestMacFrame() throws HeadlessException {            
        super("Testing");
        setSize(200, 200);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);            
        setLayout(new BorderLayout());
        add(new PaintPane());            
        setVisible(true);
    }

    protected class PaintPane extends JPanel {

        @Override
        protected void paintComponent(Graphics g) {    
            super.paintComponent(g);                
            int width = getWidth() - 1;
            int height = getHeight() - 1;                
            g.setColor(Color.BLACK);                
            int blockWidth = width / 2;
            int blockHeight = height / 2;                
            int x = (width - blockWidth) / 2;
            int y = (height - blockHeight) / 2;                
            g.fillRect(x, y, blockWidth, blockHeight);                
        }            
    }

    public static void main(String[] args) {    
        new TestMacFrame();            
    }
}

现在，我不知道你想做什么，但我可以告诉你：

public void loop() {
    Random random = new Random();
    while(running) {
        Graphics2D g = (Graphics2D) strategy.getDrawGraphics();
        g.setColor(Color.black);
        g.fillRect(20, 20, 40, 40);
        strategy.show();
    }
}

是个坏主意。首先，正如 SoboLAN 指出的，您正在尝试更新事件调度线程之外的 UI 组件。Swing 组件并不Thread安全。

其次，这个循环最终会耗尽您的 CPU 周期，使您的应用程序以及整个系统无法使用。

更新了动画

来，试试这个。这是一个非常基本的示例；）

public class TestMacFrame extends JFrame {

    private float angel = 0;
    private Timer timer;

    public TestMacFrame() throws HeadlessException {
        super("Testing");
        setSize(200, 200);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLayout(new BorderLayout());
        add(new PaintPane());
        setVisible(true);

        timer = new Timer(25, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                angel += 1;
                repaint();
            }
        });

        timer.setRepeats(true);
        timer.setCoalesce(true);
        timer.setInitialDelay(0);
        timer.start();
    }

    protected class PaintPane extends JPanel {

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);

            Graphics2D g2d = (Graphics2D) g.create();

            int width = getWidth() - 1;
            int height = getHeight() - 1;

            g.setColor(Color.BLACK);

            int blockWidth = width / 2;
            int blockHeight = height / 2;

            int x = (width - blockWidth) / 2;
            int y = (height - blockHeight) / 2;

            g2d.setTransform(AffineTransform.getRotateInstance(Math.toRadians(angel), width / 2, height / 2));
            g2d.fillRect(x, y, blockWidth, blockHeight);
            g2d.dispose();

        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new TestMacFrame();
    }
}