请问有关swing不规则窗体

Question

不规则窗体边缘总有锯齿,如何让窗体边缘抗锯齿

Answer 1

在程序中依次设置以下几个参数：
设置窗口完全透明：AWTUtilities.setWindowOpaque(frame, false);
设置窗口无边缘：frame.setUndecorated(true);
设置窗口的ContentPane为要显示的Pane：frame.setContentPane(myPane);
在myPane中放置具体要显示的内容，也可以重载paint方法进行Java2D绘制。这些paint会直接发生在桌面背景上。

Answer 2

已经成功的代码
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.io.IOException;import javax.swing.JFrame;import com.sun.awt.AWTUtilities;public class Test extends JFrame {
private static final long serialVersionUID = -6707913364098611652L;
private Image img;
private Point origin; public Test() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
makeFrame();
setVisible(true);
} private void makeFrame() {
MediaTracker mt = new MediaTracker(this);
img = Toolkit.getDefaultToolkit().createImage("a.png");
mt.addImage(img, 0);
try {
mt.waitForAll();
} catch (InterruptedException e) {
e.printStackTrace();
} try {
initialize();// 窗体初始化
} catch (IOException e) {
e.printStackTrace();
}
} private void initialize() throws IOException {
this.setSize(img.getWidth(null), img.getHeight(null));
this.setUndecorated(true);
this.origin = new Point(); AWTUtilities.setWindowOpaque(this, false); this.setLocationRelativeTo(null); addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
origin.x = e.getX();
origin.y = e.getY();
}
}); addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
Point p = getLocation();
setLocation(p.x + e.getX() - origin.x, p.y + e.getY()
- origin.y);
}
});
} public void paint(Graphics g) {
super.paint(g);
g.drawImage(img, 0, 0, null);
} public static void main(String[] args) {
new Test();
}}

Answer 3

http://www.pushing-pixels.org/wp-content/uploads/2008/03/softclippedwindow.java
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;import javax.imageio.ImageIO;
import javax.swing.*;public class SoftClippedWindow extends JFrame {
    public SoftClippedWindow() {
super("Test soft-clipped window"); JButton open = new JButton("Open window");
open.addActionListener(new ActionListener() {
@Override
    public void actionPerformed(ActionEvent e) {
    SwingUtilities.invokeLater(new Runnable() {
    @Override
public void run() {
final JWindow window = new JWindow();
window.setLayout(new BorderLayout()); try {
    // picture from
    // http://flickr.com/photos/petursey/366204314/
    final BufferedImage avatar = ImageIO
.read(SoftClippedWindow.class
      .getResource("leaf.jpg"));     JPanel mainPanel = new JPanel(new BorderLayout()) {
    @Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create(); // code from
// http://weblogs.java.net/blog/campbell/archive/2006/07/java_2d_tricker.html
int width = avatar.getWidth();
int height = avatar.getHeight();
GraphicsConfiguration gc = g2d
    .getDeviceConfiguration();
BufferedImage img = gc
    .createCompatibleImage(width,
   height,
   Transparency.TRANSLUCENT);
Graphics2D g2 = img.createGraphics(); g2.setComposite(AlphaComposite.Clear);
g2.fillRect(0, 0, width, height); g2.setComposite(AlphaComposite.Src);
g2.setRenderingHint(
    RenderingHints.KEY_ANTIALIASING,
    RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(Color.WHITE);
g2.fillRoundRect(0, 0, width, height + 10,
 10, 10); g2.setComposite(AlphaComposite.SrcAtop);
g2.drawImage(avatar, 0, 0, null);
g2.dispose(); // at this point the 'img' contains a soft
// clipped round rectangle with the avatar // do the reflection with the code from
// http://www.jroller.com/gfx/entry/swing_glint
int avatarWidth = img.getWidth();
int avatarHeight = img.getHeight(); BufferedImage reflection = new BufferedImage(
     avatarWidth, avatarHeight,
     BufferedImage.TYPE_INT_ARGB);
Graphics2D reflectionGraphics = reflection
    .createGraphics(); AffineTransform tranform = AffineTransform
    .getScaleInstance(1.0, -1.0);
tranform.translate(0, -avatarHeight);
reflectionGraphics.drawImage(img, tranform,
     this); GradientPaint painter = new GradientPaint(
  0.0f, 0.0f, new Color(0.0f, 0.0f,
0.0f, 0.7f), 0.0f,
  avatarHeight / 2.0f, new Color(
 0.0f, 0.0f, 0.0f, 1.0f)); reflectionGraphics
    .setComposite(AlphaComposite.DstOut);
reflectionGraphics.setPaint(painter);
reflectionGraphics
    .fill(new Rectangle2D.Double(0, 0,
 avatarWidth, avatarHeight)); reflectionGraphics.dispose(); g2d.drawImage(img, 0, 0, this);
g2d.drawImage(reflection, 0, avatarHeight,
      this); g2d.dispose();
    }
};
    JButton close = new JButton("close");
    close.addActionListener(new ActionListener() {
    @Override
public void actionPerformed(ActionEvent e) {
window.dispose();
    }
});
    JPanel buttonPanel = new JPanel(new FlowLayout(
   FlowLayout.RIGHT));
    buttonPanel.add(close);
    buttonPanel.setOpaque(false);
    buttonPanel.setDoubleBuffered(false);
    mainPanel.add(buttonPanel, BorderLayout.NORTH);     mainPanel.setDoubleBuffered(false);
    mainPanel.setOpaque(false);
    window.add(mainPanel, BorderLayout.CENTER);     window.setSize(180, 200);
    window.setLocationRelativeTo(null);
    window.setVisible(true);
    com.sun.awt.AWTUtilities.setWindowOpaque(window,
     false);
} catch (IOException ioe) {
    ioe.printStackTrace();
}
    }
});
}
    });
this.setLayout(new FlowLayout());
this.add(open); this.setSize(new Dimension(400, 300));
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }    public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);
SwingUtilities.invokeLater(new Runnable() {
@Override
    public void run() {
    Window w = new SoftClippedWindow();
    w.setVisible(true);
}
    });
    }}

Answer 4

恶心的是 GFW 把 Pushing Pixels 拒之墙外

Answer 5

呵呵，没实战过，你能上传一下你的a.png嘛？估计是这个出了问题，大概当初是按照gif的方式操作的。比如周围阴影，由于gif没有半透明的效果，只能用灰度，掺和背景色来模拟。所以白底上的黑影就会存为#888888或者类似的灰色。而蓝底上的黑影就会存为#8888CC或者类似的蓝灰色。因此放到不同颜色的背景上，会出现锯齿。而PNG支持半透明(alpha)，所以，阴影的颜色只和其透明度有关，比如#CC000000，其中低位的#000000就是平时的黑色，而高位的CC代表alpha值，也就是透明度80%的黑色。

Answer 6

BTW，NEVER EVER
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);等价于System.exit(0)，也就是整个JVM都shutdown了。多窗口下，或者以后扩展，代码多了，你会后悔死的。DISPOSE_ON_CLOSE，如果只有一个窗口，效果类似EXIT_ON_CLOSE