PathClippingAnimTab.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.Path;
import org.eclipse.swt.graphics.Pattern;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;

/**
 * This is another tab that demonstrates the use of a path clipping.
 */
public class PathClippingAnimTab extends AnimatedGraphicsTab {

	private int					angle;
	private GraphicsBackground	background;
	private Button				colorButton;
	private int					incHeight	= 5;
	private int					incWidth	= 5;
	private Menu				menu;
	private int					rectHeight	= 300;
	private int					rectWidth	= 300;
	private boolean				vertical	= false;

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

	/**
	 * Creates the widgets used to control the drawing.
	 */
	public void createControlPanel(Composite parent) {
		super.createControlPanel(parent);

		// color menu
		ColorMenu cm = new ColorMenu();
		cm.setPatternItems(example.checkAdvancedGraphics());
		menu = cm.createMenu(parent.getParent(), new ColorListener() {
			public void setColor(GraphicsBackground gb) {
				background = gb;
				colorButton.setImage(gb.getThumbNail());
				example.redraw();
			}
		});

		// initialize the background to the 5th item in the menu (blue)
		background = (GraphicsBackground) menu.getItem(4).getData();

		// color button
		Composite comp = new Composite(parent, SWT.NONE);
		comp.setLayout(new GridLayout(2, false));

		colorButton = new Button(comp, SWT.PUSH);
		colorButton.setText(GraphicsExample.getResourceString("Color")); //$NON-NLS-1$
		colorButton.setImage(background.getThumbNail());
		colorButton.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event event) {
				final Button button = (Button) event.widget;
				final Composite parent = button.getParent();
				Rectangle bounds = button.getBounds();
				Point point = parent.toDisplay(new Point(bounds.x, bounds.y));
				menu.setLocation(point.x, point.y + bounds.height);
				menu.setVisible(true);
			}
		});
	}

	public void dispose() {
		if (menu != null) {
			menu.dispose();
			menu = null;
		}
	}

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

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

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

	public void next(int width, int height) {
		angle = (angle + 5) % 360;
		if (vertical) {
			if (rectHeight <= 0)
				incHeight = -incHeight;
			if (rectHeight >= height) {
				incHeight = -incHeight;
				vertical = false;
			}
			rectHeight = rectHeight + incHeight;
		} else {
			if (rectWidth <= 0)
				incWidth = -incWidth;
			if (rectWidth >= width) {
				incWidth = -incWidth;
				vertical = true;
			}
			rectWidth = rectWidth + incWidth;
		}
	}

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

		// top triangle
		Path path = new Path(device);
		path.moveTo(width / 2, 0);
		path.lineTo(width / 2 + 100, 173);
		path.lineTo(width / 2 - 100, 173);
		path.lineTo(width / 2, 0);

		// bottom triangle
		Path path2 = new Path(device);
		path2.moveTo(width / 2, height);
		path2.lineTo(width / 2 + 100, height - 173);
		path2.lineTo(width / 2 - 100, height - 173);
		path2.lineTo(width / 2, height);

		// left triangle
		Path path3 = new Path(device);
		path3.moveTo(0, height / 2);
		path3.lineTo(173, height / 2 - 100);
		path3.lineTo(173, height / 2 + 100);
		path3.lineTo(0, height / 2);

		// right triangle
		Path path4 = new Path(device);
		path4.moveTo(width, height / 2);
		path4.lineTo(width - 173, height / 2 - 100);
		path4.lineTo(width - 173, height / 2 + 100);
		path4.lineTo(width, height / 2);

		// circle
		Path path5 = new Path(device);
		path5.moveTo((width - 200) / 2, (height - 200) / 2);
		path5.addArc((width - 200) / 2, (height - 200) / 2, 200, 200, 0, 360);

		// top rectangle
		Path path6 = new Path(device);
		path6.addRectangle((width - 40) / 2, 175, 40, (height - 200) / 2 - 177);

		// bottom rectangle
		Path path7 = new Path(device);
		path7.addRectangle((width - 40) / 2, (height - 200) / 2 + 202, 40, height - 175 - ((height - 200) / 2 + 202));

		// left rectangle
		Path path8 = new Path(device);
		path8.addRectangle(175, (height - 40) / 2, (width - 200) / 2 - 177, 40);

		// right rectangle
		Path path9 = new Path(device);
		path9.addRectangle((width - 200) / 2 + 202, (height - 40) / 2, width - 175 - ((width - 200) / 2 + 202), 40);

		path.addPath(path2);
		path.addPath(path3);
		path.addPath(path4);
		path.addPath(path5);
		path.addPath(path6);
		path.addPath(path7);
		path.addPath(path8);
		path.addPath(path9);
		gc.setClipping(path);

		Pattern pattern = null;
		if (background.getBgColor1() != null)
			gc.setBackground(background.getBgColor1());
		else if (background.getBgImage() != null) {
			pattern = new Pattern(device, background.getBgImage());
			gc.setBackgroundPattern(pattern);
		}

		gc.setLineWidth(2);
		gc.fillRectangle((width - rectWidth) / 2, (height - rectHeight) / 2, rectWidth, rectHeight);
		gc.drawPath(path);

		if (pattern != null)
			pattern.dispose();

		path9.dispose();
		path8.dispose();
		path7.dispose();
		path6.dispose();
		path5.dispose();
		path4.dispose();
		path3.dispose();
		path2.dispose();
		path.dispose();
	}
}