Java Graphics How to - Add a transparent text string over an image

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Question

We would like to know how to add a transparent text string over an image.

Answer

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
/*from   w ww . ja  va 2s.  c o  m*/
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

public class Main {

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        BufferedImage image = new BufferedImage(400, 300,
            BufferedImage.TYPE_INT_RGB);
        Graphics2D imageGraphics = image.createGraphics();
        GradientPaint gp = new GradientPaint(20f, 20f, Color.red, 380f, 280f,
            Color.orange);
        imageGraphics.setPaint(gp);
        imageGraphics.fillRect(0, 0, 400, 300);

        JLabel textLabel = new JLabel("java2s.com");
        textLabel.setSize(textLabel.getPreferredSize());

        Dimension d = textLabel.getPreferredSize();
        BufferedImage bi = new BufferedImage(d.width, d.height,
            BufferedImage.TYPE_INT_ARGB);
        Graphics g = bi.createGraphics();
        g.setColor(new Color(255, 200, 255, 128));
        g.fillRoundRect(0, 0, bi.getWidth(f), bi.getHeight(f), 15, 10);
        g.setColor(Color.black);
        textLabel.paint(g);
        Graphics g2 = image.getGraphics();
        g2.drawImage(bi, 20, 20, f);

        ImageIcon ii = new ImageIcon(image);
        JLabel imageLabel = new JLabel(ii);

        f.getContentPane().add(imageLabel);
        f.pack();

        f.setVisible(true);
      }
    });
  }
}

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