Transparency : 2D « SWT JFace Eclipse « Java



 * All Right Reserved. 
 * Copyright (c) 1998, 2004 Jackwind Li Guojie
 * Created on 2004-4-21 21:49:01 by JACK
 * $Id$

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class Transparency {
  Display display = new Display();
  Shell shell = new Shell(display);

  public Transparency() {
    shell.setLayout(new FillLayout());
    ImageData imageData = new ImageData("java2s.gif");
    final Image image = new Image(display, imageData);

    RGB white = new RGB(255, 255, 255);
    for(int i=0; i<imageData.width; i++) {
      for(int j=0; j<imageData.height; j++) {
        RGB rgb = imageData.palette.getRGB(imageData.getPixel(i, j));
        int threshold = 220;

        if( > threshold && > threshold && > threshold)
          imageData.setPixel(i, j, imageData.palette.getPixel(white));
    imageData.transparentPixel = imageData.palette.getPixel(new RGB(255, 255, 255));
    final Image image2 = new Image(display, imageData);
    final Canvas canvas = new Canvas(shell, SWT.NULL);
    canvas.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        e.gc.drawImage(image, 10, 20);
        e.gc.drawImage(image2, 200, 20);

    shell.setSize(400, 140);;

    // Set up the event loop.
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        // If no more entries in event queue


  private void init() {


  public static void main(String[] args) {
    new Transparency();


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