/* ===========================================================

 * JFreeChart : a free chart library for the Java(tm) platform

 * ===========================================================

 *

 * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.

 *

 * Project Info:  http://www.jfree.org/jfreechart/index.html

 *

 * This library is free software; you can redistribute it and/or modify it under the terms

 * of the GNU Lesser General Public License as published by the Free Software Foundation;

 * either version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 * See the GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License along with this

 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,

 * Boston, MA 02111-1307, USA.

 *

 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 

 * in the United States and other countries.]

 *

 * ------------------

 * PointerNeedle.java

 * ------------------

 * (C) Copyright 2002, 2003, by the Australian Antarctic Division and Contributors.

 *

 * Original Author:  Bryan Scott (for the Australian Antarctic Division);

 * Contributor(s):   David Gilbert (for Object Refinery Limited);

 *

 * $Id: PointerNeedle.java,v 1.1 2004/08/31 14:37:36 mungady Exp $

 *

 * Changes:

 * --------

 * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);

 * 26-Mar-2003 : Implemented Serializable (DG);

 * 09-Sep-2003 : Added equals(...) method (DG);

 *

 */



package org.jfree.chart.needle;



import java.awt.Graphics2D;

import java.awt.geom.GeneralPath;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;



/**

 * A needle in the shape of a pointer, for use with the

 * {@link org.jfree.chart.plot.CompassPlot} class.

 *

 * @author Bryan Scott

 */

public class PointerNeedle extends MeterNeedle {



    /**

     * Draws the needle.

     *

     * @param g2  the graphics device.

     * @param plotArea  the plot area.

     * @param rotate  the rotation point.

     * @param angle  the angle.

     */

    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, Point2D rotate, double angle) {



        GeneralPath shape1 = new GeneralPath();

        GeneralPath shape2 = new GeneralPath();

        float minX = (float) plotArea.getMinX();

        float minY = (float) plotArea.getMinY();

        float maxX = (float) plotArea.getMaxX();

        float maxY = (float) plotArea.getMaxY();

        float midX = (float) (minX + (plotArea.getWidth() / 2));

        float midY = (float) (minY + (plotArea.getHeight() / 2));



        shape1.moveTo(minX, midY);

        shape1.lineTo(midX, minY);

        shape1.lineTo(maxX, midY);

        shape1.closePath();



        shape2.moveTo(minX, midY);

        shape2.lineTo(midX, maxY);

        shape2.lineTo(maxX, midY);

        shape2.closePath();



        if ((rotate != null) && (angle != 0)) {

            /// we have rotation huston, please spin me

            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());

            shape1.transform(getTransform());

            shape2.transform(getTransform());

        }



        if (getFillPaint() != null) {

            g2.setPaint(getFillPaint());

            g2.fill(shape1);

        }



        if (getHighlightPaint() != null) {

            g2.setPaint(getHighlightPaint());

            g2.fill(shape2);

        }



        if (getOutlinePaint() != null) {

            g2.setStroke(getOutlineStroke());

            g2.setPaint(getOutlinePaint());

            g2.draw(shape1);

            g2.draw(shape2);

        }

    }



    /**

     * Tests another object for equality with this object.

     * 

     * @param object  the object to test.

     * 

     * @return A boolean.

     */

    public boolean equals(Object object) {

        if (object == null) {

            return false;

        }

        if (object == this) {

            return true;

        }

        if (super.equals(object) && object instanceof PointerNeedle) {

            return true;

        }

        return false;

    }



}

