Source for org.jfree.chart.needle.LongNeedle

   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:  * LongNeedle.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:  * 27-Mar-2003 : Implemented Serializable (DG);
  40:  * 09-Sep-2003 : Added equals() method (DG);
  41:  * 16-Mar-2004 : Implemented Rotation
  42:  */
  43: 
  44: package org.jfree.chart.needle;
  45: 
  46: import java.awt.Graphics2D;
  47: import java.awt.Shape;
  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 that is represented by a long line.
  55:  */
  56: public class LongNeedle extends MeterNeedle 
  57:                         implements Cloneable, Serializable {
  58: 
  59:     /** For serialization. */
  60:     private static final long serialVersionUID = -4319985779783688159L;
  61:     
  62:     /**
  63:      * Default constructor.
  64:      */
  65:     public LongNeedle() {
  66:         super();
  67:         setRotateY(0.8);
  68:     }
  69: 
  70:     /**
  71:      * Draws the needle.
  72:      *
  73:      * @param g2  the graphics device.
  74:      * @param plotArea  the plot area.
  75:      * @param rotate  the rotation point.
  76:      * @param angle  the angle.
  77:      */
  78:     protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
  79:                               Point2D rotate, double angle) {
  80: 
  81:         GeneralPath shape1 = new GeneralPath();
  82:         GeneralPath shape2 = new GeneralPath();
  83:         GeneralPath shape3 = new GeneralPath();
  84: 
  85:         float minX = (float) plotArea.getMinX();
  86:         float minY = (float) plotArea.getMinY();
  87:         float maxX = (float) plotArea.getMaxX();
  88:         float maxY = (float) plotArea.getMaxY();
  89:         //float midX = (float) (minX + (plotArea.getWidth() * getRotateX()));
  90:         //float midY = (float) (minY + (plotArea.getHeight() * getRotateY()));
  91:         float midX = (float) (minX + (plotArea.getWidth() * 0.5));
  92:         float midY = (float) (minY + (plotArea.getHeight() * 0.8));
  93:         float y = maxY - (2 * (maxY - midY));
  94:         if (y < minY) {
  95:             y = minY;
  96:         }
  97:         shape1.moveTo(minX, midY);
  98:         shape1.lineTo(midX, minY);
  99:         shape1.lineTo(midX, y);
 100:         shape1.closePath();
 101: 
 102:         shape2.moveTo(maxX, midY);
 103:         shape2.lineTo(midX, minY);
 104:         shape2.lineTo(midX, y);
 105:         shape2.closePath();
 106: 
 107:         shape3.moveTo(minX, midY);
 108:         shape3.lineTo(midX, maxY);
 109:         shape3.lineTo(maxX, midY);
 110:         shape3.lineTo(midX, y);
 111:         shape3.closePath();
 112: 
 113:         Shape s1 = shape1;
 114:         Shape s2 = shape2;
 115:         Shape s3 = shape3;
 116: 
 117:         if ((rotate != null) && (angle != 0)) {
 118:             /// we have rotation huston, please spin me
 119:             getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
 120:             s1 = shape1.createTransformedShape(transform);
 121:             s2 = shape2.createTransformedShape(transform);
 122:             s3 = shape3.createTransformedShape(transform);
 123:         }
 124: 
 125: 
 126:         if (getHighlightPaint() != null) {
 127:             g2.setPaint(getHighlightPaint());
 128:             g2.fill(s3);
 129:         }
 130: 
 131:         if (getFillPaint() != null) {
 132:             g2.setPaint(getFillPaint());
 133:             g2.fill(s1);
 134:             g2.fill(s2);
 135:         }
 136: 
 137: 
 138:         if (getOutlinePaint() != null) {
 139:             g2.setStroke(getOutlineStroke());
 140:             g2.setPaint(getOutlinePaint());
 141:             g2.draw(s1);
 142:             g2.draw(s2);
 143:             g2.draw(s3);
 144:         }
 145:     }
 146: 
 147:     /**
 148:      * Tests another object for equality with this object.
 149:      *
 150:      * @param obj  the object to test (<code>null</code> permitted).
 151:      *
 152:      * @return A boolean.
 153:      */
 154:     public boolean equals(Object obj) {
 155:         if (obj == this) {
 156:             return true;
 157:         }
 158:         if (!(obj instanceof LongNeedle)) {
 159:             return false;   
 160:         }
 161:         if (!super.equals(obj)) {
 162:             return false;
 163:         }
 164:         return true;
 165:     }
 166: 
 167:     /**
 168:      * Returns a clone of this needle.
 169:      * 
 170:      * @return A clone.
 171:      * 
 172:      * @throws CloneNotSupportedException if the <code>LongNeedle</code> 
 173:      *     cannot be cloned (in theory, this should not happen).
 174:      */
 175:     public Object clone() throws CloneNotSupportedException {
 176:         return super.clone();   
 177:     }
 178: 
 179: }