SWT(JFace)体验之图片的动态渐变效果

package swt_jface.demo10;
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("C:/icons/eclipse.jpg");
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();

while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
public static void main(String[] args) {
new AlphaFadeIn();
}
}

package swt_jface.demo10;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.ShellAdapter;
import org.eclipse.swt.events.ShellEvent;
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.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class Animations {

Display display = new Display();
Shell shell = new Shell(display);
public Animations() {

shell.setLayout(new FillLayout());
ImageLoader imageLoader = new ImageLoader();
final ImageData[] imageDatas = imageLoader.load("C:/icons/eclipse-ani.gif");
final Image image = new Image(display, imageDatas[0].width, imageDatas[0].height);
final Canvas canvas = new Canvas(shell, SWT.NULL);
canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
e.gc.drawImage(image, 0, 0);
}
});
final GC gc = new GC(image);
final Thread thread = new Thread() {
int frameIndex = 0;
public void run() {
while (!isInterrupted()) {
frameIndex %= imageDatas.length;
final ImageData frameData = imageDatas[frameIndex];
display.asyncExec(new Runnable() {
public void run() {
Image frame =
new Image(display, frameData);
gc.drawImage(frame, frameData.x, frameData.y);
frame.dispose();
canvas.redraw();
}
});
try {
Thread.sleep(imageDatas[frameIndex].delayTime * 10);
} catch (InterruptedException e) {
return;
}
frameIndex += 1;
}
}
};

shell.addShellListener(new ShellAdapter() {
public void shellClosed(ShellEvent e) {
thread.interrupt();
}
});
shell.setSize(400, 200);
shell.open();

thread.start();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
public static void main(String[] args) {
new Animations();
}
}