我怎样才能顺利我JFrame的形状(How can I smooth my JFrame shape

我给我的JFrame窗口圆角的自定义形状，但我怎么能抚平（抗锯齿）

Answer 1:

在很大程度上将归结为你如何呈现你的内容，但基本概念是提供呈现提示的Graphics要绘制上下文...

例如，如果我画一个组成部分，我可能会使用类似...

// Create a "copy" of the graphics context so we don't modify any of it's existing
// settings.  This makes it easier to manage the graphics context as we 
// may not want to effect anything else that might be using this graphics context
// into the future
Graphics2D g2d = (Graphics2D)g.create();
RenderingHints hints = new RenderingHints(
    RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON
);
g2d.setRenderingHints(hints);
//... continue drawing.
// Dispose of our "copy" of the graphics context
g2d.dispose();

退房控制渲染质量了解更多详情

已更新，例如

public class AATest {

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

    public AATest() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new PaintPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class PaintPane extends JPanel {

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(215, 110);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            RenderingHints hints = new RenderingHints(
                    RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2d.setRenderingHints(hints);
            g2d.setColor(Color.RED);
            drawShape(g2d, 5, 5);
            g2d.dispose();
            g2d = (Graphics2D) g.create();
            g2d.setColor(Color.BLUE);
            drawShape(g2d, 110, 5);
            g2d.dispose();
        }

        protected void drawShape(Graphics2D g2d, int x, int y) {
            g2d.draw(new Ellipse2D.Float(x, y, 100, 100));
        }
    }
}

更新了新的例子

一个我用的是不是使用“setShape”的招数，我只是做一个透明的窗口，使用自定义面板为我提供我想使用的形状。

这样做的主要问题，是你现在变成责任确保内容的形状内画...

public class ShapedWindow {

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

    public ShapedWindow() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JWindow frame = new JWindow();
                frame.setBackground(new Color(0, 0, 0, 0));
                frame.setContentPane(new ShapedPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
                frame.setAlwaysOnTop(true);
            }
        });
    }

    public class ShapedPane extends JPanel {

        public ShapedPane() {

            setOpaque(false);
            setLayout(new GridBagLayout());

            JButton button = new JButton("Close");
            button.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    System.exit(0);
                }
            });

            add(button);

        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g); //To change body of generated methods, choose Tools | Templates.
            Graphics2D g2d = (Graphics2D) g.create();
            RenderingHints hints = new RenderingHints(
                    RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2d.setRenderingHints(hints);
            g2d.setColor(getBackground());
            g2d.fill(new Ellipse2D.Float(0, 0, getWidth(), getHeight()));
            g2d.dispose();
        }
    }

}

文章来源: How can I smooth my JFrame shape