Source Code : Alpha Fade In

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Alpha Fade In

 

/******************************************************************************
 * All Right Reserved. 
 * Copyright (c) 1998, 2004 Jackwind Li Guojie
 * 
 * Created on 2004-4-21 22:36:43 by JACK
 * $Id$
 * 
 *****************************************************************************/



import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
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 AlphaFadeIn {
  Display display = new Display();
  Shell shell = new Shell(display);

  public AlphaFadeIn() {
    shell.setLayout(new FillLayout());
    final Canvas canvas = new Canvas(shell, SWT.NULL);
    
    ImageData imageData = new ImageData("java2s.gif");
    
    ImageData imageData2 = imageData.scaledTo(100, 100);
    Image image2 = new Image(display, imageData2);
    
    byte[] alphaValues = new byte[imageData.height * imageData.width];
    for(int j=0; j<imageData.height; j++) {
      for(int i=0; i<imageData.width; i++) {
        alphaValues[j*imageData.width + i] = (byte) (255 - 255 * i / imageData.width);
      }
    }
    
    
    
    imageData.alphaData = alphaValues;
    
    final Image image = new Image(display, imageData);
    
    canvas.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        e.gc.drawImage(image, 10, 10);
      }
    });

    shell.setSize(200, 100);
    shell.open();
    //textUser.forceFocus();

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

    display.dispose();
  }

  private void init() {

  }

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


           
         
  

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