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: PinNeedle.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 PinNeedle extends MeterNeedle implements Cloneable,
061: Serializable {
062:
063: /** For serialization. */
064: private static final long serialVersionUID = -3787089953079863373L;
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 midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
084: //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
085: int lenX = (int) (plotArea.getWidth() / 10);
086: if (lenX < 2) {
087: lenX = 2;
088: }
089:
090: pointer.moveTo(midX - lenX, maxY - lenX);
091: pointer.lineTo(midX + lenX, maxY - lenX);
092: pointer.lineTo(midX, minY + lenX);
093: pointer.closePath();
094:
095: lenX = 4 * lenX;
096: Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2,
097: plotArea.getMaxY() - lenX, lenX, lenX);
098:
099: shape = new Area(circle);
100: shape.add(new Area(pointer));
101: if ((rotate != null) && (angle != 0)) {
102: /// we have rotation
103: getTransform().setToRotation(angle, rotate.getX(),
104: rotate.getY());
105: shape.transform(getTransform());
106: }
107:
108: defaultDisplay(g2, shape);
109:
110: }
111:
112: /**
113: * Tests another object for equality with this object.
114: *
115: * @param obj the object to test (<code>null</code> permitted).
116: *
117: * @return A boolean.
118: */
119: public boolean equals(Object obj) {
120: if (obj == this ) {
121: return true;
122: }
123: if (!(obj instanceof PinNeedle)) {
124: return false;
125: }
126: if (!super .equals(obj)) {
127: return false;
128: }
129: return true;
130: }
131:
132: /**
133: * Returns a clone of this needle.
134: *
135: * @return A clone.
136: *
137: * @throws CloneNotSupportedException if the <code>PinNeedle</code>
138: * cannot be cloned (in theory, this should not happen).
139: */
140: public Object clone() throws CloneNotSupportedException {
141: return super.clone();
142: }
143:
144: }
|