TransformationDrawing.java Source code

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Here is the source code for TransformationDrawing.java

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/*******************************************************************************
 * 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
 *******************************************************************************/

/* 
 * Drawing with transformations, paths and alpha blending
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.1
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Path;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Transform;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class TransformationDrawing {
    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);

        FontData fd = shell.getFont().getFontData()[0];
        final Font font = new Font(display, fd.getName(), 60, SWT.BOLD | SWT.ITALIC);
        final Image image = new Image(display, 640, 480);
        final Rectangle rect = image.getBounds();
        GC gc = new GC(image);
        gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
        gc.fillOval(rect.x, rect.y, rect.width, rect.height);
        gc.dispose();

        shell.addListener(SWT.Paint, new Listener() {
            public void handleEvent(Event event) {
                GC gc = event.gc;
                Transform tr = new Transform(display);
                tr.translate(50, 120);
                tr.rotate(-30);
                gc.drawImage(image, 0, 0, rect.width, rect.height, 0, 0, rect.width / 2, rect.height / 2);
                gc.setAlpha(100);
                gc.setTransform(tr);
                Path path = new Path(display);
                path.addString("SWT", 0, 0, font);
                gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
                gc.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
                gc.fillPath(path);
                gc.drawPath(path);
                tr.dispose();
                path.dispose();
            }
        });
        shell.setSize(shell.computeSize(rect.width / 2, rect.height / 2));
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        image.dispose();
        font.dispose();
        display.dispose();
    }
}