/*******************************************************************************
 * Copyright (c) 2000, 2010 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.gef.examples.logicdesigner.figures;

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.geometry.PointList;
import org.eclipse.draw2d.geometry.Rectangle;

/**
 * A figure that has a bent corner in the top right hand. Typically used for
 * sticky notes.
 */
public class BentCornerFigure extends Figure {

	/**
	 * The default amount of pixels subtracted from the figure's height and
	 * width to determine the size of the corner.
	 */
	protected static int DEFAULT_CORNER_SIZE = 10;

	private int cornerSize;

	/**
	 * Constructs an empty BentCornerFigure with default background color of
	 * ColorConstants.tooltipBackground and default corner size.
	 */
	public BentCornerFigure() {
		setBackgroundColor(ColorConstants.tooltipBackground);
		setForegroundColor(ColorConstants.tooltipForeground);
		setCornerSize(DEFAULT_CORNER_SIZE);
	}

	/**
	 * Returns the size, in pixels, that the figure should use to draw its bent
	 * corner.
	 * 
	 * @return size of the corner
	 */
	public int getCornerSize() {
		return cornerSize;
	}

	/**
	 * @see org.eclipse.draw2d.Figure#paintFigure(org.eclipse.draw2d.Graphics)
	 */
	protected void paintFigure(Graphics graphics) {
		Rectangle rect = getBounds().getCopy();

		graphics.translate(getLocation());

		// fill the note
		PointList outline = new PointList();

		outline.addPoint(0, 0);
		outline.addPoint(rect.width - cornerSize, 0);
		outline.addPoint(rect.width - 1, cornerSize);
		outline.addPoint(rect.width - 1, rect.height - 1);
		outline.addPoint(0, rect.height - 1);

		graphics.fillPolygon(outline);

		// draw the inner outline
		PointList innerLine = new PointList();

		innerLine.addPoint(rect.width - cornerSize - 1, 0);
		innerLine.addPoint(rect.width - cornerSize - 1, cornerSize);
		innerLine.addPoint(rect.width - 1, cornerSize);
		innerLine.addPoint(rect.width - cornerSize - 1, 0);
		innerLine.addPoint(0, 0);
		innerLine.addPoint(0, rect.height - 1);
		innerLine.addPoint(rect.width - 1, rect.height - 1);
		innerLine.addPoint(rect.width - 1, cornerSize);

		graphics.drawPolygon(innerLine);

		graphics.translate(getLocation().getNegated());
	}

	/**
	 * Sets the size of the figure's corner to the given offset.
	 * 
	 * @param newSize
	 *            the new size to use.
	 */
	public void setCornerSize(int newSize) {
		cornerSize = newSize;
	}

}