content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
   * in the United States and other countries.]
   *
   * ----------------
   * ArrowNeedle.java
   * ----------------
   * (C) Copyright 2002-2008, by the Australian Antarctic Division and
   *                          Contributors.
   *
   * Original Author:  Bryan Scott (for the Australian Antarctic Division);
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * Changes:
   * --------
   * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
   * 27-Mar-2003 : Implemented Serializable (DG);
   * 09-Sep-2003 : Added equals() method (DG);
   * 08-Jun-2005 : Implemented Cloneable (DG);
   * 22-Nov-2007 : Added hashCode() implementation (DG);
   *
   */
  
  package org.jfree.chart.needle;
  
  import java.awt.Graphics2D;
  import java.awt.Shape;
  import java.awt.geom.GeneralPath;
  import java.awt.geom.Line2D;
  import java.awt.geom.Point2D;
  import java.awt.geom.Rectangle2D;
  import java.io.Serializable;
  
  import org.jfree.chart.HashUtilities;
  
  /**
   * A needle in the shape of an arrow.
   */
  public class ArrowNeedle extends MeterNeedle
                           implements Cloneable, Serializable {
  
      /** For serialization. */
      private static final long serialVersionUID = -5334056511213782357L;
  
      /**
       * A flag controlling whether or not there is an arrow at the top of the
       * needle.
       */
      private boolean isArrowAtTop = true;
  
      /**
       * Constructs a new arrow needle.
       *
       * @param isArrowAtTop  a flag that controls whether or not there is an
       *                      arrow at the top of the needle.
       */
      public ArrowNeedle(boolean isArrowAtTop) {
          this.isArrowAtTop = isArrowAtTop;
      }
  
      /**
       * Draws the needle.
       *
       * @param g2  the graphics device.
       * @param plotArea  the plot area.
       * @param rotate  the rotation point.
       * @param angle  the angle.
       */
      protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
                                Point2D rotate, double angle) {
  
          Line2D shape = new Line2D.Float();
          Shape d = null;
  
          float x = (float) (plotArea.getMinX() +  (plotArea.getWidth() / 2));
          float minY = (float) plotArea.getMinY();
          float maxY = (float) plotArea.getMaxY();
          shape.setLine(x, minY, x, maxY);
  
          GeneralPath shape1 = new GeneralPath();
          if (this.isArrowAtTop) {
              shape1.moveTo(x, minY);
              minY += 4 * getSize();
          }
          else {
              shape1.moveTo(x, maxY);
              minY = maxY - 4 * getSize();
          }
          shape1.lineTo(x + getSize(), minY);
          shape1.lineTo(x - getSize(), minY);
          shape1.closePath();
  
          if ((rotate != null) && (angle != 0)) {
              getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
              d = getTransform().createTransformedShape(shape);
          }
          else {
              d = shape;
          }
          defaultDisplay(g2, d);
  
          if ((rotate != null) && (angle != 0)) {
              d = getTransform().createTransformedShape(shape1);
          }
          else {
              d = shape1;
          }
          defaultDisplay(g2, d);
  
      }
  
      /**
       * Tests another object for equality with this object.
       *
       * @param obj  the object to test (<code>null</code> permitted).
       *
       * @return A boolean.
       */
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if (!(obj instanceof ArrowNeedle)) {
              return false;
          }
          if (!super.equals(obj)) {
              return false;
          }
          ArrowNeedle that = (ArrowNeedle) obj;
          if (this.isArrowAtTop != that.isArrowAtTop) {
              return false;
          }
          return true;
      }
  
      /**
       * Returns a hash code for this instance.
       *
       * @return A hash code.
       */
      public int hashCode() {
          int result = super.hashCode();
          result = HashUtilities.hashCode(result, this.isArrowAtTop);
          return result;
      }
  
      /**
       * Returns a clone of this needle.
       *
       * @return A clone.
       *
       * @throws CloneNotSupportedException if the <code>ArrowNeedle</code>
       *     cannot be cloned (in theory, this should not happen).
       */
      public Object clone() throws CloneNotSupportedException {
          return super.clone();
      }
  
  }
  