JFrame与后台运行的图像/程序具有相同的形状

JFrame the same shape as an Image / Program running in background(JFrame与后台运行的图像/程序具有相同的形状)

问题描述

我的问题很简单，解决方案肯定不是.我正在寻找一种将 JFrame 塑造成与它将显示的图像相同的方法.形状是指具有 alpha != 0 的像素的形状.我已经找到了一个使用 GeneralPath 对象的工作示例，但它为大约 500*400 的图像创建了约 110000 个节点"，因此开始JFrame耗时2多分钟，绝对不是想要的效果，启动应该在2秒以内.

My question is simple, the solution surely not. I am looking for a way to shape a JFrame the same as an Image it will be displaying. By shape I mean the shape of the pixels that have an alpha != 0. I've already found a working example using a GeneralPath object, but it created ~110000 "nodes" for an Image of about 500*400, so starting the JFrame took more than 2 minutes, which is definitely not the desired effect, the startup should be in under 2 seconds.

感谢您的宝贵时间.

推荐答案

我个人会放弃窗口形状，转而使用透明窗口，这对你想要做的事情来说更简单......

I personally would ditch the window shape in favor of a transparent window, it's just simpler for what you are trying to do...

还有关闭按钮(看左下角)

And with the close button (look to the bottom left)

图像周围的红色边框是故意的，因为它显示了窗口"边界.

The red border around the image is deliberate, as it shows the "window" bounds.

这依赖于 Java 1.7 或 Java 1.6_10+，代码中有检查.

This relies on either Java 1.7 or Java 1.6_10+, there are checks in the code.

public class TransparentFrame {

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

    public TransparentFrame() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setUndecorated(true);
                frame.setContentPane(new ContentPane());

                String version = System.getProperty("java.version");
                System.out.println(version);
                if (version.startsWith("1.7")) {
                    frame.setBackground(new Color(0, 0, 0, 0));
                } else if (version.startsWith("1.6")) {
                    if (supportsPerAlphaPixel()) {
                        setOpaque(frame, false);
                    } else {
                        System.out.println("Per Pixel Alphering is not support with Java " + version);
                        System.exit(1);
                    }
                } else {
                    System.out.println("Per Pixel Alphering is not support with Java " + version);
                    System.exit(1);
                }
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new ImagePane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public static boolean supportsPerAlphaPixel() {

        boolean support = false;

        try {

            Class<?> awtUtilsClass = Class.forName("com.sun.awt.AWTUtilities");
            support = true;

        } catch (Exception exp) {
        }

        return support;

    }

    public static void setOpaque(Window window, boolean opaque) {

        try {

            Class<?> awtUtilsClass = Class.forName("com.sun.awt.AWTUtilities");
            if (awtUtilsClass != null) {

                Method method = awtUtilsClass.getMethod("setWindowOpaque", Window.class, boolean.class);
                method.invoke(null, window, opaque);

            }

        } catch (Exception exp) {
        }

    }

    public class ContentPane extends JPanel {

        public ContentPane() {
            setOpaque(false);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.setColor(Color.RED);
            g.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
        }
    }

    public class ImagePane extends JPanel {

        private BufferedImage background;
        private BufferedImage offImage;
        private Ellipse2D offButton;
        private boolean mouseIn;

        public ImagePane() {
            setOpaque(false);
            try {
                background = ImageIO.read(new File("tamagotchi400.png"));
                offImage = ImageIO.read(new File("powerSmall.png"));
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            offButton = new Ellipse2D.Float(212, 330, 25, 25);
            MouseAdapter handler = new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    if (e.getClickCount() == 1 && e.getButton() == MouseEvent.BUTTON1) {
                        if (offButton.contains(e.getPoint())) {
                            Window window = SwingUtilities.getWindowAncestor(ImagePane.this);
                            if (window != null) {
                                window.dispose();
                            }
                        }
                    }
                }

                @Override
                public void mouseMoved(MouseEvent e) {
                    Cursor cursor = Cursor.getDefaultCursor();
                    if (offButton.contains(e.getPoint())) {
                        cursor = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
                    }
                    setCursor(cursor);
                }

                @Override
                public void mouseEntered(MouseEvent e) {
                    mouseIn = true;
                    repaint();
                }

                @Override
                public void mouseExited(MouseEvent e) {
                    mouseIn = false;
                    repaint();
                }
            };
            addMouseListener(handler);
            addMouseMotionListener(handler);
        }

        @Override
        public Dimension getPreferredSize() {
            return background == null ? new Dimension(400, 400) : new Dimension(background.getWidth(), background.getHeight());
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            if (background != null) {
                Graphics2D g2d = (Graphics2D) g.create();
                int x = (getWidth() - background.getWidth()) / 2;
                int y = (getHeight() - background.getHeight()) / 2;
                g2d.drawImage(background, x, y, this);
                if (mouseIn && offImage != null) {
                    g2d.drawImage(offImage, (int) offButton.getX(), (int) offButton.getY(), this);
                }
                g2d.dispose();
            }
        }
    }
}

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