Java Tutorial/SWT 2D Graphics/PNG GIF
Display an animated GIF
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2004 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; /*
* Image example snippet: display an animated GIF * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */
import org.eclipse.swt.SWT; import org.eclipse.swt.SWTException; import org.eclipse.swt.graphics.Color; 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.widgets.Display; import org.eclipse.swt.widgets.FileDialog; import org.eclipse.swt.widgets.Shell; public class AnimatedGIFDisplay {
static Display display;
static Shell shell;
static GC shellGC;
static Color shellBackground;
static ImageLoader loader;
static ImageData[] imageDataArray;
static Thread animateThread;
static Image image;
static final boolean useGIFBackground = false;
public static void main(String[] args) {
display = new Display();
shell = new Shell(display);
shell.setSize(300, 300);
shell.open();
shellGC = new GC(shell);
shellBackground = shell.getBackground();
FileDialog dialog = new FileDialog(shell);
dialog.setFilterExtensions(new String[] { "*.gif" });
String fileName = dialog.open();
if (fileName != null) {
loader = new ImageLoader();
try {
imageDataArray = loader.load(fileName);
if (imageDataArray.length > 1) {
animateThread = new Thread("Animation") {
public void run() {
/*
* Create an off-screen image to draw on, and fill it with the
* shell background.
*/
Image offScreenImage = new Image(display, loader.logicalScreenWidth,
loader.logicalScreenHeight);
GC offScreenImageGC = new GC(offScreenImage);
offScreenImageGC.setBackground(shellBackground);
offScreenImageGC.fillRectangle(0, 0, loader.logicalScreenWidth,
loader.logicalScreenHeight);
try {
/* Create the first image and draw it on the off-screen image. */
int imageDataIndex = 0;
ImageData imageData = imageDataArray[imageDataIndex];
if (image != null && !image.isDisposed())
image.dispose();
image = new Image(display, imageData);
offScreenImageGC.drawImage(image, 0, 0, imageData.width, imageData.height,
imageData.x, imageData.y, imageData.width, imageData.height);
/*
* Now loop through the images, creating and drawing each one on
* the off-screen image before drawing it on the shell.
*/
int repeatCount = loader.repeatCount;
while (loader.repeatCount == 0 || repeatCount > 0) {
switch (imageData.disposalMethod) {
case SWT.DM_FILL_BACKGROUND:
/* Fill with the background color before drawing. */
Color bgColor = null;
if (useGIFBackground && loader.backgroundPixel != -1) {
bgColor = new Color(display, imageData.palette.getRGB(loader.backgroundPixel));
}
offScreenImageGC.setBackground(bgColor != null ? bgColor : shellBackground);
offScreenImageGC.fillRectangle(imageData.x, imageData.y, imageData.width,
imageData.height);
if (bgColor != null)
bgColor.dispose();
break;
case SWT.DM_FILL_PREVIOUS:
/* Restore the previous image before drawing. */
offScreenImageGC.drawImage(image, 0, 0, imageData.width, imageData.height,
imageData.x, imageData.y, imageData.width, imageData.height);
break;
}
imageDataIndex = (imageDataIndex + 1) % imageDataArray.length;
imageData = imageDataArray[imageDataIndex];
image.dispose();
image = new Image(display, imageData);
offScreenImageGC.drawImage(image, 0, 0, imageData.width, imageData.height,
imageData.x, imageData.y, imageData.width, imageData.height);
/* Draw the off-screen image to the shell. */
shellGC.drawImage(offScreenImage, 0, 0);
/*
* Sleep for the specified delay time (adding commonly-used
* slow-down fudge factors).
*/
try {
int ms = imageData.delayTime * 10;
if (ms < 20)
ms += 30;
if (ms < 30)
ms += 10;
Thread.sleep(ms);
} catch (InterruptedException e) {
}
/*
* If we have just drawn the last image, decrement the repeat
* count and start again.
*/
if (imageDataIndex == imageDataArray.length - 1)
repeatCount--;
}
} catch (SWTException ex) {
System.out.println("There was an error animating the GIF");
} finally {
if (offScreenImage != null && !offScreenImage.isDisposed())
offScreenImage.dispose();
if (offScreenImageGC != null && !offScreenImageGC.isDisposed())
offScreenImageGC.dispose();
if (image != null && !image.isDisposed())
image.dispose();
}
}
};
animateThread.setDaemon(true);
animateThread.start();
}
} catch (SWTException ex) {
System.out.println("There was an error loading the GIF");
}
}
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
Write an animated GIF to a file
<source lang="java">
/*******************************************************************************
* 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;
}
}</source>
Write an Image to a PNG file
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2006 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 Image to a PNG file. * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */
import org.eclipse.swt.*; import org.eclipse.swt.graphics.*; import org.eclipse.swt.widgets.*; public class PNGFileWriteImage {
public static void main(String[] args) {
Display display = new Display();
Font font = new Font(display, "Comic Sans MS", 24, SWT.BOLD);
Image image = new Image(display, 87, 48);
GC gc = new GC(image);
gc.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
gc.fillRectangle(image.getBounds());
gc.setFont(font);
gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
gc.drawString("S", 3, 0);
gc.setForeground(display.getSystemColor(SWT.COLOR_GREEN));
gc.drawString("W", 25, 0);
gc.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
gc.drawString("T", 62, 0);
gc.dispose();
ImageLoader loader = new ImageLoader();
loader.data = new ImageData[] {image.getImageData()};
loader.save("swt.png", SWT.IMAGE_PNG);
image.dispose();
font.dispose();
display.dispose();
}
}</source>
