Source for org.jfree.chart.needle.PointerNeedle

   1: /* ===========================================================
   2:  * JFreeChart : a free chart library for the Java(tm) platform
   3:  * ===========================================================
   4:  *
   5:  * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
   6:  *
   7:  * Project Info:  http://www.jfree.org/jfreechart/index.html
   8:  *
   9:  * This library is free software; you can redistribute it and/or modify it 
  10:  * under the terms of the GNU Lesser General Public License as published by 
  11:  * the Free Software Foundation; either version 2.1 of the License, or 
  12:  * (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but 
  15:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
  16:  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
  17:  * License for more details.
  18:  *
  19:  * You should have received a copy of the GNU Lesser General Public
  20:  * License along with this library; if not, write to the Free Software
  21:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
  22:  * USA.  
  23:  *
  24:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
  25:  * in the United States and other countries.]
  26:  *
  27:  * ------------------
  28:  * PointerNeedle.java
  29:  * ------------------
  30:  * (C) Copyright 2002-2007, by the Australian Antarctic Division and 
  31:  *                          Contributors.
  32:  *
  33:  * Original Author:  Bryan Scott (for the Australian Antarctic Division);
  34:  * Contributor(s):   David Gilbert (for Object Refinery Limited);
  35:  *
  36:  * Changes:
  37:  * --------
  38:  * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
  39:  * 26-Mar-2003 : Implemented Serializable (DG);
  40:  * 09-Sep-2003 : Added equals() method (DG);
  41:  * 08-Jun-2005 : Implemented Cloneable (DG);
  42:  *
  43:  */
  44: 
  45: package org.jfree.chart.needle;
  46: 
  47: import java.awt.Graphics2D;
  48: import java.awt.geom.GeneralPath;
  49: import java.awt.geom.Point2D;
  50: import java.awt.geom.Rectangle2D;
  51: import java.io.Serializable;
  52: 
  53: /**
  54:  * A needle in the shape of a pointer, for use with the
  55:  * {@link org.jfree.chart.plot.CompassPlot} class.
  56:  */
  57: public class PointerNeedle extends MeterNeedle 
  58:                            implements Cloneable, Serializable {
  59: 
  60:     /** For serialization. */
  61:     private static final long serialVersionUID = -4744677345334729606L;
  62:     
  63:     /**
  64:      * Draws the needle.
  65:      *
  66:      * @param g2  the graphics device.
  67:      * @param plotArea  the plot area.
  68:      * @param rotate  the rotation point.
  69:      * @param angle  the angle.
  70:      */
  71:     protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
  72:                               Point2D rotate, double angle) {
  73: 
  74:         GeneralPath shape1 = new GeneralPath();
  75:         GeneralPath shape2 = new GeneralPath();
  76:         float minX = (float) plotArea.getMinX();
  77:         float minY = (float) plotArea.getMinY();
  78:         float maxX = (float) plotArea.getMaxX();
  79:         float maxY = (float) plotArea.getMaxY();
  80:         float midX = (float) (minX + (plotArea.getWidth() / 2));
  81:         float midY = (float) (minY + (plotArea.getHeight() / 2));
  82: 
  83:         shape1.moveTo(minX, midY);
  84:         shape1.lineTo(midX, minY);
  85:         shape1.lineTo(maxX, midY);
  86:         shape1.closePath();
  87: 
  88:         shape2.moveTo(minX, midY);
  89:         shape2.lineTo(midX, maxY);
  90:         shape2.lineTo(maxX, midY);
  91:         shape2.closePath();
  92: 
  93:         if ((rotate != null) && (angle != 0)) {
  94:             /// we have rotation huston, please spin me
  95:             getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
  96:             shape1.transform(getTransform());
  97:             shape2.transform(getTransform());
  98:         }
  99: 
 100:         if (getFillPaint() != null) {
 101:             g2.setPaint(getFillPaint());
 102:             g2.fill(shape1);
 103:         }
 104: 
 105:         if (getHighlightPaint() != null) {
 106:             g2.setPaint(getHighlightPaint());
 107:             g2.fill(shape2);
 108:         }
 109: 
 110:         if (getOutlinePaint() != null) {
 111:             g2.setStroke(getOutlineStroke());
 112:             g2.setPaint(getOutlinePaint());
 113:             g2.draw(shape1);
 114:             g2.draw(shape2);
 115:         }
 116:     }
 117: 
 118:     /**
 119:      * Tests another object for equality with this object.
 120:      * 
 121:      * @param obj  the object to test (<code>null</code> permitted).
 122:      * 
 123:      * @return A boolean.
 124:      */
 125:     public boolean equals(Object obj) {
 126:         if (obj == this) {
 127:             return true;
 128:         }
 129:         if (!(obj instanceof PointerNeedle)) {
 130:             return false;   
 131:         }
 132:         if (!super.equals(obj)) {
 133:             return false;
 134:         }
 135:         return true;
 136:     }
 137: 
 138:     /**
 139:      * Returns a clone of this needle.
 140:      * 
 141:      * @return A clone.
 142:      * 
 143:      * @throws CloneNotSupportedException if the <code>PointerNeedle</code> 
 144:      *     cannot be cloned (in theory, this should not happen).
 145:      */
 146:     public Object clone() throws CloneNotSupportedException {
 147:         return super.clone();   
 148:     }
 149: 
 150: }