Creating a varying gradient translucent window : Swing « JDK 7 « Java

1. Java
2. JDK 7
3. Swing

Creating a varying gradient translucent window

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsDevice;
import java.awt.GraphicsDevice.WindowTranslucency;
import java.awt.GraphicsEnvironment;
import java.awt.Paint;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Test {

  public static void main(String[] args) {
    GraphicsEnvironment envmt = GraphicsEnvironment
        .getLocalGraphicsEnvironment();
    GraphicsDevice device = envmt.getDefaultScreenDevice();

    if (!device
        .isWindowTranslucencySupported(WindowTranslucency.PERPIXEL_TRANSLUCENT)) {
      System.out
          .println("Translucent windows are not supported on your system.");
      System.exit(0);
    }
    JFrame.setDefaultLookAndFeelDecorated(true);
    ApplicationWindow window = new ApplicationWindow();
    window.setVisible(true);
  }
}

class ApplicationWindow extends JFrame {

  public ApplicationWindow() {
    setBackground(new Color(0, 0, 0, 0));
    this.setSize(200, 200);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel panel = new JPanel() {
      @Override
      protected void paintComponent(Graphics gradient) {
        if (gradient instanceof Graphics2D) {
          final int Red = 150;
          final int Green = 150;
          final int Blue = 150;
          Paint paint = new GradientPaint(0.0f, 0.0f, new Color(Red, Green,
              Blue, 0), getWidth(), getHeight(), new Color(Red, Green, Blue,
              255));
          Graphics2D gradient2d = (Graphics2D) gradient;
          gradient2d.setPaint(paint);
          gradient2d.fillRect(0, 0, getWidth(), getHeight());
        }
      }
    };
    this.setContentPane(panel);
  }
}

 

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