为什么 Java 教程How to Create Translucent and Shaped Windows 失效了？您使用的是最新版本的 Java 6 还是 Java 7？
在May/June issue of Java Magazine 中，有一个关于需要Java 7 的形状和透明窗口的教程。您可能需要注册Java 杂志才能阅读它。看看你是否可以让它在你的系统上运行：
import java.awt.*; //Graphics2D, LinearGradientPaint, Point, Window, Window.Type;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
/**
* From JavaMagazine May/June 2012
* @author josh
*/
public class ShapedAboutWindowDemo {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
//switch to the right thread
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame("About box");
//turn of window decorations
frame.setUndecorated(true);
//turn off the background
frame.setBackground(new Color(0,0,0,0));
frame.setContentPane(new AboutComponent());
frame.pack();
//size the window
frame.setSize(500, 200);
frame.setVisible(true);
//center on screen
frame.setLocationRelativeTo(null);
}
}
);
}
private static class AboutComponent extends JComponent {
public void paintComponent(Graphics graphics) {
Graphics2D g = (Graphics2D) graphics;
//create a translucent gradient
Color[] colors = new Color[]{
new Color(0,0,0,0)
,new Color(0.3f,0.3f,0.3f,1f)
,new Color(0.3f,0.3f,0.3f,1f)
,new Color(0,0,0,0)};
float[] stops = new float[]{0,0.2f,0.8f,1f};
LinearGradientPaint paint = new LinearGradientPaint(
new Point(0,0), new Point(500,0),
stops,colors);
//fill a rect then paint with text
g.setPaint(paint);
g.fillRect(0, 0, 500, 200);
g.setPaint(Color.WHITE);
g.drawString("My Killer App", 200, 100);
}
}
}