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: * LineNeedle.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: LineNeedle.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.Shape;
051: import java.awt.geom.Line2D;
052: import java.awt.geom.Point2D;
053: import java.awt.geom.Rectangle2D;
054: import java.io.Serializable;
055:
056: /**
057: * A needle that is represented by a line.
058: */
059: public class LineNeedle extends MeterNeedle implements Cloneable,
060: Serializable {
061:
062: /** For serialization. */
063: private static final long serialVersionUID = 6215321387896748945L;
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: Line2D shape = new Line2D.Double();
077:
078: double x = plotArea.getMinX() + (plotArea.getWidth() / 2);
079: shape.setLine(x, plotArea.getMinY(), x, plotArea.getMaxY());
080:
081: Shape s = shape;
082:
083: if ((rotate != null) && (angle != 0)) {
084: /// we have rotation
085: getTransform().setToRotation(angle, rotate.getX(),
086: rotate.getY());
087: s = getTransform().createTransformedShape(s);
088: }
089:
090: defaultDisplay(g2, s);
091:
092: }
093:
094: /**
095: * Tests another object for equality with this object.
096: *
097: * @param obj the object to test (<code>null</code> permitted).
098: *
099: * @return A boolean.
100: */
101: public boolean equals(Object obj) {
102: if (obj == this ) {
103: return true;
104: }
105: if (!(obj instanceof LineNeedle)) {
106: return false;
107: }
108: if (!super .equals(obj)) {
109: return false;
110: }
111: return true;
112: }
113:
114: /**
115: * Returns a clone of this needle.
116: *
117: * @return A clone.
118: *
119: * @throws CloneNotSupportedException if the <code>LineNeedle</code>
120: * cannot be cloned (in theory, this should not happen).
121: */
122: public Object clone() throws CloneNotSupportedException {
123: return super.clone();
124: }
125:
126: }
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