SWT(JFace)体验之图片的动态渐变效果

1.渐变：

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();}}

 

2.动态

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();}}