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: * PointerNeedle.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: PointerNeedle.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: * 26-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.GeneralPath;
051: import java.awt.geom.Point2D;
052: import java.awt.geom.Rectangle2D;
053: import java.io.Serializable;
054:
055: /**
056: * A needle in the shape of a pointer, for use with the
057: * {@link org.jfree.chart.plot.CompassPlot} class.
058: */
059: public class PointerNeedle extends MeterNeedle implements Cloneable,
060: Serializable {
061:
062: /** For serialization. */
063: private static final long serialVersionUID = -4744677345334729606L;
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: GeneralPath shape1 = new GeneralPath();
077: GeneralPath shape2 = new GeneralPath();
078: float minX = (float) plotArea.getMinX();
079: float minY = (float) plotArea.getMinY();
080: float maxX = (float) plotArea.getMaxX();
081: float maxY = (float) plotArea.getMaxY();
082: float midX = (float) (minX + (plotArea.getWidth() / 2));
083: float midY = (float) (minY + (plotArea.getHeight() / 2));
084:
085: shape1.moveTo(minX, midY);
086: shape1.lineTo(midX, minY);
087: shape1.lineTo(maxX, midY);
088: shape1.closePath();
089:
090: shape2.moveTo(minX, midY);
091: shape2.lineTo(midX, maxY);
092: shape2.lineTo(maxX, midY);
093: shape2.closePath();
094:
095: if ((rotate != null) && (angle != 0)) {
096: /// we have rotation huston, please spin me
097: getTransform().setToRotation(angle, rotate.getX(),
098: rotate.getY());
099: shape1.transform(getTransform());
100: shape2.transform(getTransform());
101: }
102:
103: if (getFillPaint() != null) {
104: g2.setPaint(getFillPaint());
105: g2.fill(shape1);
106: }
107:
108: if (getHighlightPaint() != null) {
109: g2.setPaint(getHighlightPaint());
110: g2.fill(shape2);
111: }
112:
113: if (getOutlinePaint() != null) {
114: g2.setStroke(getOutlineStroke());
115: g2.setPaint(getOutlinePaint());
116: g2.draw(shape1);
117: g2.draw(shape2);
118: }
119: }
120:
121: /**
122: * Tests another object for equality with this object.
123: *
124: * @param obj the object to test (<code>null</code> permitted).
125: *
126: * @return A boolean.
127: */
128: public boolean equals(Object obj) {
129: if (obj == this ) {
130: return true;
131: }
132: if (!(obj instanceof PointerNeedle)) {
133: return false;
134: }
135: if (!super .equals(obj)) {
136: return false;
137: }
138: return true;
139: }
140:
141: /**
142: * Returns a clone of this needle.
143: *
144: * @return A clone.
145: *
146: * @throws CloneNotSupportedException if the <code>PointerNeedle</code>
147: * cannot be cloned (in theory, this should not happen).
148: */
149: public Object clone() throws CloneNotSupportedException {
150: return super.clone();
151: }
152:
153: }
|