/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ---------------
* PlumNeedle.java
* ---------------
* (C) Copyright 2002-2007, by the Australian Antarctic Division and
* Contributors.
*
* Original Author: Bryan Scott (for the Australian Antarctic Division);
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* Changes:
* --------
* 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
* 27-Mar-2003 : Implemented Serializable (DG);
* 09-Sep-2003 : Added equals() method (DG);
* 08-Jun-2005 : Implemented Cloneable (DG);
* 22-Nov-2007 : Implemented hashCode() (DG);
*
*/
package org.jfree.chart.needle;
import java.awt.Graphics2D;
import java.awt.geom.Arc2D;
import java.awt.geom.Area;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
/**
* A needle for use with the {@link org.jfree.chart.plot.CompassPlot} class.
*/
public class PlumNeedle extends MeterNeedle
implements Cloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = -3082660488660600718L;
/**
* 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) {
Arc2D shape = new Arc2D.Double(Arc2D.PIE);
double radius = plotArea.getHeight();
double halfX = plotArea.getWidth() / 2;
double diameter = 2 * radius;
shape.setFrame(plotArea.getMinX() + halfX - radius ,
plotArea.getMinY() - radius,
diameter, diameter);
radius = Math.toDegrees(Math.asin(halfX / radius));
shape.setAngleStart(270 - radius);
shape.setAngleExtent(2 * radius);
Area s = new Area(shape);
if ((rotate != null) && (angle != 0)) {
/// we have rotation houston, please spin me
getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
s.transform(getTransform());
}
defaultDisplay(g2, s);
}
/**
* Tests another object for equality with this object.
*
* @param obj the object to test (<code>null</code> permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof PlumNeedle)) {
return false;
}
if (!super.equals(obj)) {
return false;
}
return true;
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
public int hashCode() {
return super.hashCode();
}
/**
* Returns a clone of this needle.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the <code>PlumNeedle</code>
* cannot be cloned (in theory, this should not happen).
*/
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}