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Show Transparent Text

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To draw the text, Font class is used. To show transparency over the specified text, the class AlphaComposite is used which shows the transparency effects with graphics.

Show Transparent Text

     

This section shows you the transparent text.

To draw the text, Font class is used. To show transparency over the specified text, the class AlphaComposite is used which shows the transparency effects with graphics. The class Ellipse2D is defined to draw the oval over the specified text representing the transparency.

The method getInstance(AlphaComposite.SRC_OVER, .6f) creates the AlphaComposite object with the specified rule and the constant alpha. The rule AlphaComposite.SRC_OVER defines that the source is composited over the destination.

To compose a draw primitive with the graphics area, interface Composite is used. The method setComposite(comp) sets the Composite. Then it combines a shape, or text, being rendered with the colors according to defined rules.

Following code draws the text:

g2d.setPaint(Color.red);
g2d.setFont(new Font("Book Antiqua", Font.ITALIC, 30));  
g2d.drawString("Java is an Object Oriented Programming language.",10, 110);

Here is the code of ShowTransparentText.java

import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;

public class ShowTransparentText extends JPanel {
 public void paint(Graphics g) {   Graphics2D g2d = (Graphics2D) g;   Ellipse2D ellipse = new Ellipse2D.Double(4545500120);    g2d.setPaint(Color.black);    g2d.fill(ellipse); 
 Composite comp = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .6f);
  g2d.setComposite(comp);
  g2d.setPaint(Color.red);
  g2d.setFont(new Font("Book Antiqua", Font.ITALIC, 30));
  g2d.drawString("Java is an Object Oriented Programming language.",10110);
  } public static void main(String[] args) {
  JFrame frame = new JFrame("Show Transparent Text");
  frame.getContentPane().add(new ShowTransparentText());
  frame.setSize(700200);
  frame.setVisible(true);
  } }

Output will be displayed as:

Download Source Code

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Posted on: October 16, 2008

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