001: /* ===========================================================
002: * JFreeChart : a free chart library for the Java(tm) platform
003: * ===========================================================
004: *
005: * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
006: *
007: * Project Info: http://www.jfree.org/jfreechart/index.html
008: *
009: * This library is free software; you can redistribute it and/or modify it
010: * under the terms of the GNU Lesser General Public License as published by
011: * the Free Software Foundation; either version 2.1 of the License, or
012: * (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful, but
015: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017: * License for more details.
018: *
019: * You should have received a copy of the GNU Lesser General Public
020: * License along with this library; if not, write to the Free Software
021: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022: * USA.
023: *
024: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025: * in the United States and other countries.]
026: *
027: * ---------------
028: * PlumNeedle.java
029: * ---------------
030: * (C) Copyright 2002-2006, by the Australian Antarctic Division and
031: * Contributors.
032: *
033: * Original Author: Bryan Scott (for the Australian Antarctic Division);
034: * Contributor(s): David Gilbert (for Object Refinery Limited);
035: *
036: * $Id: PlumNeedle.java,v 1.4.2.3 2006/08/02 10:40:57 mungady Exp $
037: *
038: * Changes:
039: * --------
040: * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
041: * 27-Mar-2003 : Implemented Serializable (DG);
042: * 09-Sep-2003 : Added equals() method (DG);
043: * 08-Jun-2005 : Implemented Cloneable (DG);
044: *
045: */
046:
047: package org.jfree.chart.needle;
048:
049: import java.awt.Graphics2D;
050: import java.awt.geom.Arc2D;
051: import java.awt.geom.Area;
052: import java.awt.geom.Point2D;
053: import java.awt.geom.Rectangle2D;
054: import java.io.Serializable;
055:
056: /**
057: * A needle for use with the {@link org.jfree.chart.plot.CompassPlot} class.
058: */
059: public class PlumNeedle extends MeterNeedle implements Cloneable,
060: Serializable {
061:
062: /** For serialization. */
063: private static final long serialVersionUID = -3082660488660600718L;
064:
065: /**
066: * Draws the needle.
067: *
068: * @param g2 the graphics device.
069: * @param plotArea the plot area.
070: * @param rotate the rotation point.
071: * @param angle the angle.
072: */
073: protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
074: Point2D rotate, double angle) {
075:
076: Arc2D shape = new Arc2D.Double(Arc2D.PIE);
077: double radius = plotArea.getHeight();
078: double halfX = plotArea.getWidth() / 2;
079: double diameter = 2 * radius;
080:
081: shape.setFrame(plotArea.getMinX() + halfX - radius, plotArea
082: .getMinY()
083: - radius, diameter, diameter);
084: radius = Math.toDegrees(Math.asin(halfX / radius));
085: shape.setAngleStart(270 - radius);
086: shape.setAngleExtent(2 * radius);
087:
088: Area s = new Area(shape);
089:
090: if ((rotate != null) && (angle != 0)) {
091: /// we have rotation houston, please spin me
092: getTransform().setToRotation(angle, rotate.getX(),
093: rotate.getY());
094: s.transform(getTransform());
095: }
096:
097: defaultDisplay(g2, s);
098: }
099:
100: /**
101: * Tests another object for equality with this object.
102: *
103: * @param obj the object to test (<code>null</code> permitted).
104: *
105: * @return A boolean.
106: */
107: public boolean equals(Object obj) {
108: if (obj == this ) {
109: return true;
110: }
111: if (!(obj instanceof PlumNeedle)) {
112: return false;
113: }
114: if (!super .equals(obj)) {
115: return false;
116: }
117: return true;
118: }
119:
120: /**
121: * Returns a clone of this needle.
122: *
123: * @return A clone.
124: *
125: * @throws CloneNotSupportedException if the <code>PlumNeedle</code>
126: * cannot be cloned (in theory, this should not happen).
127: */
128: public Object clone() throws CloneNotSupportedException {
129: return super.clone();
130: }
131:
132: }
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