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Draw part of an Image

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.graphics.Rectangle; 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 ImagePartDraw {   public static void main(String[] args) {     final Display display = new Display();     final Shell shell = new Shell(display);     shell.setText("Canvas Example");     shell.setLayout(new FillLayout());     Canvas canvas = new Canvas(shell, SWT.NONE);     canvas.addPaintListener(new PaintListener() {       public void paintControl(PaintEvent e) {         Image image = new Image(display, "yourFile.gif");         System.out.println(image.getImageData().scanlinePad);         image.getImageData().scanlinePad = 40;         System.out.println(image.getImageData().scanlinePad);         e.gc.drawImage(image, 0, 0);         // Determine how big the drawing area is         Rectangle rect = shell.getClientArea();         // Get information about the image         ImageData data = image.getImageData();         // Calculate drawing values         int srcX = data.width / 4;         int srcY = data.height / 4;         int srcWidth = data.width / 2;         int srcHeight = data.height / 2;         int destWidth = 2 * srcWidth;         int destHeight = 2 * srcHeight;         // Draw the image         e.gc.drawImage(image, srcX, srcY, srcWidth, srcHeight, rect.width - destWidth, rect.height             - destHeight, destWidth, destHeight);       }     });     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }