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();
    }
}