ImageFlipTab.java

/*******************************************************************************
 * Copyright (c) 2006 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
 *******************************************************************************/

package org.eclipse.swt.examples.graphics;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Transform;

/**
 * This tab demonstrates how an image can be flipped in various fashions.
 */
public class ImageFlipTab extends GraphicsTab {

	/**
	 * Returns the name of a valid font for the host platform.
	 */
	static String getPlatformFont() {
		if (SWT.getPlatform() == "win32")
			return "Arial";
		else if (SWT.getPlatform() == "motif")
			return "Helvetica";
		else if (SWT.getPlatform() == "gtk")
			return "Baekmuk Batang";
		else if (SWT.getPlatform() == "carbon")
			return "Arial";
		else
			return "Verdana";
	}

	public ImageFlipTab(GraphicsExample example) {
		super(example);
	}

	public String getCategory() {
		return GraphicsExample.getResourceString("Image"); //$NON-NLS-1$
	}

	public String getDescription() {
		return GraphicsExample.getResourceString("FlipDescription"); //$NON-NLS-1$
	}

	public String getText() {
		return GraphicsExample.getResourceString("Flip"); //$NON-NLS-1$
	}

	public void paint(GC gc, int width, int height) {
		if (!example.checkAdvancedGraphics())
			return;
		Device device = gc.getDevice();

		Image image = GraphicsExample.loadImage(device, GraphicsExample.class, "houses.png");
		Rectangle bounds = image.getBounds();

		// top
		Transform transform = new Transform(device);
		transform.translate((width - bounds.width) / 2, (height - bounds.height) / 2);
		transform.scale(1, -1);
		gc.setTransform(transform);

		// draw the original image
		gc.drawImage(image, 0, 0);

		transform.dispose();

		// bottom
		transform = new Transform(device);
		transform.translate((width - bounds.width) / 2, 2 * bounds.height + (height - bounds.height) / 2);
		transform.scale(1, -1);
		gc.setTransform(transform);

		// draw the original image
		gc.drawImage(image, 0, 0);

		transform.dispose();

		// left
		transform = new Transform(device);
		transform.translate((width - bounds.width) / 2, (height - bounds.height) / 2);
		transform.scale(-1, 1);
		gc.setTransform(transform);

		// draw the original image
		gc.drawImage(image, 0, 0);

		transform.dispose();

		// right
		transform = new Transform(device);
		transform.translate(2 * bounds.width + (width - bounds.width) / 2, (height - bounds.height) / 2);
		transform.scale(-1, 1);
		gc.setTransform(transform);

		// draw the original image
		gc.drawImage(image, 0, 0);

		transform.dispose();

		gc.setTransform(null);
		gc.drawImage(image, (width - bounds.width) / 2, (height - bounds.height) / 2);
		image.dispose();
	}
}