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/*******************************************************************************
 * 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
 *     Alexander Shatalin (Borland) - Contribution for Bug 238874
 *******************************************************************************/
package org.eclipse.draw2d;

import org.eclipse.draw2d.geometry.Geometry;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.PointList;
import org.eclipse.draw2d.geometry.Rectangle;

/**
 * Renders a {@link PointList} as a series of line segments. A Polyline figure
 * should be positioned by manipulating its points, NOT by calling
 * {@link Figure#setBounds(Rectangle)}.
 * 
 * A polyline's bounds will be calculated automatically based on its PointList.
 * The bounds will be the smallest Rectangle large enough to render the line
 * properly. Children should not be added to a Polyline and will not affect the
 * bounds calculation.
 */
public class Polyline extends AbstractPointListShape {

	private int tolerance = 2;
	private static final Rectangle LINEBOUNDS = Rectangle.SINGLETON;

	{
		setFill(false);
		bounds = null;
	}

	/**
	 * @see org.eclipse.draw2d.IFigure#containsPoint(int, int)
	 */
	public boolean containsPoint(int x, int y) {
		int tolerance = (int) Math.max(getLineWidthFloat() / 2.0f,
				this.tolerance);
		LINEBOUNDS.setBounds(getBounds());
		LINEBOUNDS.expand(tolerance, tolerance);
		if (!LINEBOUNDS.contains(x, y))
			return false;
		return shapeContainsPoint(x, y) || childrenContainsPoint(x, y);
	}

	protected boolean shapeContainsPoint(int x, int y) {
		return Geometry.polylineContainsPoint(points, x, y, tolerance);
	}

	/**
	 * Null implementation for a line.
	 * 
	 * @see org.eclipse.draw2d.Shape#fillShape(Graphics)
	 */
	protected void fillShape(Graphics g) {
	}

	/**
	 * @see org.eclipse.draw2d.IFigure#getBounds()
	 */
	public Rectangle getBounds() {
		if (bounds == null) {
			int expand = (int) (getLineWidthFloat() / 2.0f);
			bounds = getPoints().getBounds().getExpanded(expand, expand);
		}
		return bounds;
	}

	/**
	 * @return false because Polyline's aren't filled
	 */
	public boolean isOpaque() {
		return false;
	}

	/**
	 * @see Shape#outlineShape(Graphics)
	 */
	protected void outlineShape(Graphics g) {
		g.drawPolyline(points);
	}

	/**
	 * @see Figure#primTranslate(int, int)
	 */
	public void primTranslate(int x, int y) {
	}

	/**
	 * Erases the Polyline and removes all of its {@link Point Points}.
	 * 
	 * @since 2.0
	 */
	public void removeAllPoints() {
		super.removeAllPoints();
		bounds = null;
	}

	/**
	 * @see org.eclipse.draw2d.Shape#setLineWidth(int)
	 */
	public void setLineWidth(int w) {
		if (getLineWidthFloat() == w) {
			return;
		}
		if (w < getLineWidthFloat()) { // The bounds will become smaller, so
										// erase must occur first.
			erase();
		}
		bounds = null;
		super.setLineWidthFloat(w);
	}

	/**
	 * Sets the list of points to be used by this polyline connection. Removes
	 * any previously existing points. The polyline will hold onto the given
	 * list by reference.
	 * 
	 * @param points
	 *            new set of points
	 * @since 2.0
	 */
	public void setPoints(PointList points) {
		super.setPoints(points);
		firePropertyChange(Connection.PROPERTY_POINTS, null, points);
	}

	/**
	 * Sets the tolerance
	 * 
	 * @param tolerance
	 *            the new tolerance value of the Polyline
	 */
	public void setTolerance(int tolerance) {
		this.tolerance = tolerance;
	}

	public void repaint() {
		bounds = null;
		super.repaint();
	}
}