Write an animated GIF to a file : PNG GIF « SWT 2D Graphics « Java Tutorial

1. Java Tutorial
2. SWT 2D Graphics
3. PNG GIF

/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
//package org.eclipse.swt.snippets;
/*
 * Write an animated GIF to a file.
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Display;

public class AnimatedGIFWriteFile {
  static Display display;

  static Color white, red, green, blue;

  static PaletteData palette;

  static Font font;

  public static void main(String[] args) {
    display = new Display();
    RGB whiteRGB = new RGB(0xff, 0xff, 0xff);
    RGB redRGB = new RGB(0xff, 0, 0);
    RGB greenRGB = new RGB(0, 0xff, 0);
    RGB blueRGB = new RGB(0, 0, 0xff);
    palette = new PaletteData(new RGB[] { whiteRGB, // 0
        redRGB, // 1
        greenRGB, // 2
        blueRGB }); // 3
    white = new Color(display, whiteRGB);
    red = new Color(display, redRGB);
    green = new Color(display, greenRGB);
    blue = new Color(display, blueRGB);
    font = new Font(display, "Comic Sans MS", 24, SWT.BOLD);

    ImageData[] data = new ImageData[4];
    data[0] = newFrame("", white, false, 0, 0, 101, 55, SWT.DM_FILL_NONE, 40);
    data[1] = newFrame("S", red, true, 0, 0, 30, 55, SWT.DM_FILL_NONE, 40);
    data[2] = newFrame("W", green, true, 28, 0, 39, 55, SWT.DM_FILL_NONE, 40);
    data[3] = newFrame("T", blue, true, 69, 0, 32, 55, SWT.DM_FILL_BACKGROUND, 200);

    ImageLoader loader = new ImageLoader();
    loader.data = data;
    loader.backgroundPixel = 0;
    loader.logicalScreenHeight = data[0].height;
    loader.logicalScreenWidth = data[0].width;
    loader.repeatCount = 0; // run forever
    loader.save("swt.gif", SWT.IMAGE_GIF);

    white.dispose();
    red.dispose();
    green.dispose();
    blue.dispose();
    font.dispose();
    display.dispose();

  }

  private static ImageData newFrame(String letter, Color color, boolean transparent, int x, int y,
      int width, int height, int disposalMethod, int delayTime) {
    ImageData temp = new ImageData(width, height, 2, palette); // 4-color
                                                                // palette has
                                                                // depth 2
    Image image = new Image(display, temp);
    GC gc = new GC(image);
    gc.setBackground(white);
    gc.fillRectangle(0, 0, width, height);
    gc.setForeground(color);
    gc.setFont(font);
    gc.drawString(letter, 5, 5);
    gc.dispose();
    ImageData frame = image.getImageData();
    if (transparent)
      frame.transparentPixel = 0; // white
    image.dispose();
    frame.x = x;
    frame.y = y;
    frame.disposalMethod = disposalMethod;
    frame.delayTime = delayTime;
    return frame;
  }
}