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: * PinNeedle.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: MiddlePinNeedle.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.Area;
051: import java.awt.geom.Ellipse2D;
052: import java.awt.geom.GeneralPath;
053: import java.awt.geom.Point2D;
054: import java.awt.geom.Rectangle2D;
055: import java.io.Serializable;
056:
057: /**
058: * A needle that is drawn as a pin shape.
059: */
060: public class MiddlePinNeedle extends MeterNeedle implements Cloneable,
061: Serializable {
062:
063: /** For serialization. */
064: private static final long serialVersionUID = 6237073996403125310L;
065:
066: /**
067: * Draws the needle.
068: *
069: * @param g2 the graphics device.
070: * @param plotArea the plot area.
071: * @param rotate the rotation point.
072: * @param angle the angle.
073: */
074: protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
075: Point2D rotate, double angle) {
076:
077: Area shape;
078: GeneralPath pointer = new GeneralPath();
079:
080: int minY = (int) (plotArea.getMinY());
081: //int maxX = (int) (plotArea.getMaxX());
082: int maxY = (int) (plotArea.getMaxY());
083: int midY = ((maxY - minY) / 2) + minY;
084:
085: int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
086: //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
087: int lenX = (int) (plotArea.getWidth() / 10);
088: if (lenX < 2) {
089: lenX = 2;
090: }
091:
092: pointer.moveTo(midX - lenX, midY - lenX);
093: pointer.lineTo(midX + lenX, midY - lenX);
094: pointer.lineTo(midX, minY);
095: pointer.closePath();
096:
097: lenX = 4 * lenX;
098: Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2, midY
099: - lenX, lenX, lenX);
100:
101: shape = new Area(circle);
102: shape.add(new Area(pointer));
103: if ((rotate != null) && (angle != 0)) {
104: /// we have rotation
105: getTransform().setToRotation(angle, rotate.getX(),
106: rotate.getY());
107: shape.transform(getTransform());
108: }
109:
110: defaultDisplay(g2, shape);
111:
112: }
113:
114: /**
115: * Tests another object for equality with this object.
116: *
117: * @param object the object to test.
118: *
119: * @return A boolean.
120: */
121: public boolean equals(Object object) {
122: if (object == null) {
123: return false;
124: }
125: if (object == this ) {
126: return true;
127: }
128: if (super .equals(object) && object instanceof MiddlePinNeedle) {
129: return true;
130: }
131: return false;
132: }
133:
134: /**
135: * Returns a clone of this needle.
136: *
137: * @return A clone.
138: *
139: * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code>
140: * cannot be cloned (in theory, this should not happen).
141: */
142: public Object clone() throws CloneNotSupportedException {
143: return super.clone();
144: }
145:
146: }
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