ShapesTab.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.Transform;

/**
 * This tab draws 3D shapes (in 2D) using various line styles.
 */
public class ShapesTab extends AnimatedGraphicsTab {

	int	inc	= 1;
	int	upDownValue;

	public ShapesTab(GraphicsExample example) {
		super(example);
		upDownValue = 0;
	}

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

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

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

	public void next(int width, int height) {
		upDownValue += inc;

		if (upDownValue > 5)
			inc = -1;
		if (upDownValue < -5)
			inc = 1;
	}

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

		int size = 100;

		gc.setLineWidth(2);

		// ----- cube -----

		Transform transform = new Transform(device);
		transform.translate(width / 4 - size, height / 4 + -upDownValue);
		gc.setTransform(transform);

		gc.setLineStyle(SWT.LINE_DOT);

		// fill in left face
		gc.setBackground(device.getSystemColor(SWT.COLOR_RED));
		gc.fillPolygon(new int[] { 0, 0, size / 3, -size / 2, size / 3, size / 2, 0, size });

		gc.setLineStyle(SWT.LINE_SOLID);

		// square
		gc.drawRectangle(0, 0, size, size);

		// next 3 solid lines
		gc.drawLine(0, 0, size / 3, -size / 2); // left
		gc.drawLine(size, 0, 4 * size / 3, -size / 2); // middle
		gc.drawLine(size, size, 4 * size / 3, size / 2); // right

		// 2 furthest solid lines
		gc.drawLine(size / 3, -size / 2, 4 * size / 3, -size / 2); // horizontal
		gc.drawLine(4 * size / 3, size / 2, 4 * size / 3, -size / 2); // vertical

		// 3 dotted lines
		gc.setLineStyle(SWT.LINE_DOT);
		gc.drawLine(0, size, size / 3, size / 2);
		gc.drawLine(size / 3, -size / 2, size / 3, size / 2);
		gc.drawLine(4 * size / 3, size / 2, size / 3, size / 2);

		// fill right side of cube
		gc.setBackground(device.getSystemColor(SWT.COLOR_GRAY));
		gc.fillPolygon(new int[] { size, 0, 4 * size / 3, -size / 2, 4 * size / 3, size / 2, size, size });

		transform.dispose();

		// ----- pyramid -----

		transform = new Transform(device);
		transform.translate(width / 2 + size / 2, height / 4 + size + upDownValue);
		gc.setTransform(transform);

		// fill back of pyramid
		gc.fillPolygon(new int[] { size / 3, -size / 2, 6 * size / 10, -5 * size / 4, 4 * size / 3, -size / 2 });

		// fill left side of pyramid
		gc.setBackground(device.getSystemColor(SWT.COLOR_GREEN));
		gc.fillPolygon(new int[] { 0, 0, 6 * size / 10, -5 * size / 4, size / 3, -size / 2 });

		// select solid line style
		gc.setLineStyle(SWT.LINE_SOLID);

		// 2 solid lines of base
		gc.drawLine(0, 0, size, 0);
		gc.drawLine(size, 0, 4 * size / 3, -size / 2);

		// 3 solid lines of pyramid
		gc.drawLine(0, 0, 6 * size / 10, -5 * size / 4);
		gc.drawLine(size, 0, 6 * size / 10, -5 * size / 4);
		gc.drawLine(4 * size / 3, -size / 2, 6 * size / 10, -5 * size / 4);

		// select dot line style
		gc.setLineStyle(SWT.LINE_DOT);

		// 3 dotted lines
		gc.drawLine(0, 0, size / 3, -size / 2); // left
		gc.drawLine(size / 3, -size / 2, 6 * size / 10, -5 * size / 4); // to top of pyramid
		gc.drawLine(4 * size / 3, -size / 2, size / 3, -size / 2); // right

		transform.dispose();

		// ----- rectangular prism -----

		transform = new Transform(device);
		transform.translate(width / 2 + upDownValue, height / 2 + size);
		gc.setTransform(transform);

		// fill bottom
		gc.setBackground(device.getSystemColor(SWT.COLOR_BLUE));
		gc.fillPolygon(new int[] { 0, size, size / 3, size / 2, 7 * size / 3, size / 2, 2 * size, size });

		// select solid line style
		gc.setLineStyle(SWT.LINE_SOLID);

		gc.drawRectangle(0, 0, 2 * size, size);

		// next 3 solid lines
		gc.drawLine(0, 0, size / 3, -size / 2); // left
		gc.drawLine(2 * size, 0, 7 * size / 3, -size / 2); // middle
		gc.drawLine(2 * size, size, 7 * size / 3, size / 2); // right

		// 2 furthest solid lines
		gc.drawLine(size / 3, -size / 2, 7 * size / 3, -size / 2); // horizontal
		gc.drawLine(7 * size / 3, size / 2, 7 * size / 3, -size / 2); // vertical

		// 3 dotted lines
		gc.setLineStyle(SWT.LINE_DASHDOTDOT);
		gc.drawLine(0, size, size / 3, size / 2);
		gc.drawLine(size / 3, -size / 2, size / 3, size / 2);
		gc.drawLine(7 * size / 3, size / 2, size / 3, size / 2);

		// fill top
		gc.setBackground(device.getSystemColor(SWT.COLOR_GRAY));
		gc.fillPolygon(new int[] { 0, 0, size / 3, -size / 2, 7 * size / 3, -size / 2, 2 * size, 0 });

		transform.dispose();

		// ----- triangular shape -----
		transform = new Transform(device);
		transform.translate(width / 4 - size - upDownValue, height / 2 + size + upDownValue);
		gc.setTransform(transform);

		// fill back of shape (top left)
		gc.setBackground(device.getSystemColor(SWT.COLOR_YELLOW));
		gc.fillPolygon(new int[] { 0, 0, size / 2, -size, size / 2, -size / 3 });

		// fill back of shape (bottom right)
		gc.fillPolygon(new int[] { size, 0, size / 2, size, size / 2, -size / 3 });

		// select solid line style
		gc.setLineStyle(SWT.LINE_SOLID);

		// solid lines of bottom triangle
		gc.drawLine(0, 0, size / 2, size);
		gc.drawLine(size, 0, size / 2, size);

		// solid lines of top triangle
		gc.drawLine(0, 0, size / 2, -size);
		gc.drawLine(size, 0, size / 2, -size);

		// solid lines on top
		gc.drawLine(0, 0, size / 2, -size / 3);
		gc.drawLine(size, 0, size / 2, -size / 3);
		gc.drawLine(size / 2, -size / 3, size / 2, size);
		gc.drawLine(size / 2, -size / 3, size / 2, -size);

		transform.dispose();
	}

}