gt:             - Math.cos(this.angle + Math.PI / 2.0) * this.arrowWidth;
context: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2013, 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.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * ------------------------------
   * CategoryPointerAnnotation.java
   * ------------------------------
   * (C) Copyright 2006-2012, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   Peter Kolb (patch 2809117);
   *
   * Changes:
   * --------
   * 02-Oct-2006 : Version 1 (DG);
   * 06-Mar-2007 : Implemented hashCode() (DG);
   * 24-Jun-2009 : Fire change events (see patch 2809117 by PK) (DG);
   * 30-Mar-2010 : Correct calculation of pointer line (see patch 2954302) (DG);
   * 16-Jun-2012 : Removed JCommon dependencies (DG);
   *
   */
  
  package org.jfree.chart.annotations;
  
  import java.awt.BasicStroke;
  import java.awt.Color;
  import java.awt.Graphics2D;
  import java.awt.Paint;
  import java.awt.Stroke;
  import java.awt.geom.GeneralPath;
  import java.awt.geom.Line2D;
  import java.awt.geom.Rectangle2D;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.io.Serializable;
  
  import org.jfree.chart.HashUtilities;
  import org.jfree.chart.axis.CategoryAxis;
  import org.jfree.chart.axis.ValueAxis;
  import org.jfree.chart.ui.RectangleEdge;
  import org.jfree.chart.util.ObjectUtilities;
  import org.jfree.chart.util.PublicCloneable;
  import org.jfree.chart.event.AnnotationChangeEvent;
  import org.jfree.chart.plot.CategoryPlot;
  import org.jfree.chart.plot.Plot;
  import org.jfree.chart.plot.PlotOrientation;
  import org.jfree.chart.text.TextUtilities;
  import org.jfree.chart.util.ParamChecks;
  import org.jfree.chart.util.SerialUtilities;
  import org.jfree.data.category.CategoryDataset;
  
  /**
   * An arrow and label that can be placed on a {@link CategoryPlot}.  The arrow
   * is drawn at a user-definable angle so that it points towards the (category,
   * value) location for the annotation.
   * <p>
   * The arrow length (and its offset from the (category, value) location) is
   * controlled by the tip radius and the base radius attributes.  Imagine two
   * circles around the (category, value) coordinate: the inner circle defined by
   * the tip radius, and the outer circle defined by the base radius.  Now, draw
   * the arrow starting at some point on the outer circle (the point is
   * determined by the angle), with the arrow tip being drawn at a corresponding
   * point on the inner circle.
   *
   * @since 1.0.3
   */
  public class CategoryPointerAnnotation extends CategoryTextAnnotation
          implements Cloneable, PublicCloneable, Serializable {
  
      /** For serialization. */
      private static final long serialVersionUID = -4031161445009858551L;
  
      /** The default tip radius (in Java2D units). */
      public static final double DEFAULT_TIP_RADIUS = 10.0;
  
      /** The default base radius (in Java2D units). */
      public static final double DEFAULT_BASE_RADIUS = 30.0;
  
      /** The default label offset (in Java2D units). */
      public static final double DEFAULT_LABEL_OFFSET = 3.0;
  
      /** The default arrow length (in Java2D units). */
      public static final double DEFAULT_ARROW_LENGTH = 5.0;
  
      /** The default arrow width (in Java2D units). */
      public static final double DEFAULT_ARROW_WIDTH = 3.0;
  
      /** The angle of the arrow's line (in radians). */
      private double angle;
  
      /**
       * The radius from the (x, y) point to the tip of the arrow (in Java2D
       * units).
       */
      private double tipRadius;
  
      /**
       * The radius from the (x, y) point to the start of the arrow line (in
       * Java2D units).
       */
      private double baseRadius;
  
      /** The length of the arrow head (in Java2D units). */
      private double arrowLength;
  
      /** The arrow width (in Java2D units, per side). */
      private double arrowWidth;
  
      /** The arrow stroke. */
      private transient Stroke arrowStroke;
  
      /** The arrow paint. */
      private transient Paint arrowPaint;
  
      /** The radius from the base point to the anchor point for the label. */
      private double labelOffset;
  
      /**
       * Creates a new label and arrow annotation.
       *
       * @param label  the label (<code>null</code> permitted).
       * @param key  the category key.
       * @param value  the y-value (measured against the chart's range axis).
       * @param angle  the angle of the arrow's line (in radians).
       */
      public CategoryPointerAnnotation(String label, Comparable key, double value,
              double angle) {
  
          super(label, key, value);
          this.angle = angle;
          this.tipRadius = DEFAULT_TIP_RADIUS;
          this.baseRadius = DEFAULT_BASE_RADIUS;
          this.arrowLength = DEFAULT_ARROW_LENGTH;
          this.arrowWidth = DEFAULT_ARROW_WIDTH;
          this.labelOffset = DEFAULT_LABEL_OFFSET;
          this.arrowStroke = new BasicStroke(1.0f);
          this.arrowPaint = Color.BLACK;
  
      }
  
      /**
       * Returns the angle of the arrow.
       *
       * @return The angle (in radians).
       *
       * @see #setAngle(double)
       */
      public double getAngle() {
          return this.angle;
      }
  
      /**
       * Sets the angle of the arrow and sends an
       * {@link AnnotationChangeEvent} to all registered listeners.
       *
       * @param angle  the angle (in radians).
       *
       * @see #getAngle()
       */
      public void setAngle(double angle) {
          this.angle = angle;
          fireAnnotationChanged();
      }
  
      /**
       * Returns the tip radius.
       *
       * @return The tip radius (in Java2D units).
       *
       * @see #setTipRadius(double)
       */
      public double getTipRadius() {
          return this.tipRadius;
      }
  
      /**
       * Sets the tip radius and sends an
       * {@link AnnotationChangeEvent} to all registered listeners.
       *
       * @param radius  the radius (in Java2D units).
       *
       * @see #getTipRadius()
       */
      public void setTipRadius(double radius) {
          this.tipRadius = radius;
          fireAnnotationChanged();
      }
  
      /**
       * Returns the base radius.
       *
       * @return The base radius (in Java2D units).
       *
       * @see #setBaseRadius(double)
       */
      public double getBaseRadius() {
          return this.baseRadius;
      }
  
      /**
       * Sets the base radius and sends an
       * {@link AnnotationChangeEvent} to all registered listeners.
       *
       * @param radius  the radius (in Java2D units).
       *
       * @see #getBaseRadius()
       */
      public void setBaseRadius(double radius) {
          this.baseRadius = radius;
          fireAnnotationChanged();
      }
  
      /**
       * Returns the label offset.
       *
       * @return The label offset (in Java2D units).
       *
       * @see #setLabelOffset(double)
       */
      public double getLabelOffset() {
          return this.labelOffset;
      }
  
      /**
       * Sets the label offset (from the arrow base, continuing in a straight
       * line, in Java2D units) and sends an
       * {@link AnnotationChangeEvent} to all registered listeners.
       *
       * @param offset  the offset (in Java2D units).
       *
       * @see #getLabelOffset()
       */
      public void setLabelOffset(double offset) {
          this.labelOffset = offset;
          fireAnnotationChanged();
      }
  
      /**
       * Returns the arrow length.
       *
       * @return The arrow length.
       *
       * @see #setArrowLength(double)
       */
      public double getArrowLength() {
          return this.arrowLength;
      }
  
      /**
       * Sets the arrow length and sends an
       * {@link AnnotationChangeEvent} to all registered listeners.
       *
       * @param length  the length.
       *
       * @see #getArrowLength()
       */
      public void setArrowLength(double length) {
          this.arrowLength = length;
          fireAnnotationChanged();
      }
  
      /**
       * Returns the arrow width.
       *
       * @return The arrow width (in Java2D units).
       *
       * @see #setArrowWidth(double)
       */
      public double getArrowWidth() {
          return this.arrowWidth;
      }
  
      /**
       * Sets the arrow width and sends an
       * {@link AnnotationChangeEvent} to all registered listeners.
       *
       * @param width  the width (in Java2D units).
       *
       * @see #getArrowWidth()
       */
      public void setArrowWidth(double width) {
          this.arrowWidth = width;
          fireAnnotationChanged();
      }
  
      /**
       * Returns the stroke used to draw the arrow line.
       *
       * @return The arrow stroke (never <code>null</code>).
       *
       * @see #setArrowStroke(Stroke)
       */
      public Stroke getArrowStroke() {
          return this.arrowStroke;
      }
  
      /**
       * Sets the stroke used to draw the arrow line and sends an
       * {@link AnnotationChangeEvent} to all registered listeners.
       *
       * @param stroke  the stroke (<code>null</code> not permitted).
       *
       * @see #getArrowStroke()
       */
      public void setArrowStroke(Stroke stroke) {
          ParamChecks.nullNotPermitted(stroke, "stroke");
          this.arrowStroke = stroke;
          fireAnnotationChanged();
      }
  
      /**
       * Returns the paint used for the arrow.
       *
       * @return The arrow paint (never <code>null</code>).
       *
       * @see #setArrowPaint(Paint)
       */
      public Paint getArrowPaint() {
          return this.arrowPaint;
      }
  
      /**
       * Sets the paint used for the arrow and sends an
       * {@link AnnotationChangeEvent} to all registered listeners.
       *
       * @param paint  the arrow paint (<code>null</code> not permitted).
       *
       * @see #getArrowPaint()
       */
      public void setArrowPaint(Paint paint) {
          if (paint == null) {
              throw new IllegalArgumentException("Null 'paint' argument.");
          }
          this.arrowPaint = paint;
          fireAnnotationChanged();
      }
  
      /**
       * Draws the annotation.
       *
       * @param g2  the graphics device.
       * @param plot  the plot.
       * @param dataArea  the data area.
       * @param domainAxis  the domain axis.
       * @param rangeAxis  the range axis.
       */
      @Override
      public void draw(Graphics2D g2, CategoryPlot plot, Rectangle2D dataArea,
              CategoryAxis domainAxis, ValueAxis rangeAxis) {
  
          PlotOrientation orientation = plot.getOrientation();
          RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
                  plot.getDomainAxisLocation(), orientation);
          RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
                  plot.getRangeAxisLocation(), orientation);
          CategoryDataset dataset = plot.getDataset();
          int catIndex = dataset.getColumnIndex(getCategory());
          int catCount = dataset.getColumnCount();
          double j2DX = domainAxis.getCategoryMiddle(catIndex, catCount,
                  dataArea, domainEdge);
          double j2DY = rangeAxis.valueToJava2D(getValue(), dataArea, rangeEdge);
          if (orientation == PlotOrientation.HORIZONTAL) {
              double temp = j2DX;
              j2DX = j2DY;
              j2DY = temp;
          }
          double startX = j2DX + Math.cos(this.angle) * this.baseRadius;
          double startY = j2DY + Math.sin(this.angle) * this.baseRadius;
  
          double endX = j2DX + Math.cos(this.angle) * this.tipRadius;
          double endY = j2DY + Math.sin(this.angle) * this.tipRadius;
  
          double arrowBaseX = endX + Math.cos(this.angle) * this.arrowLength;
          double arrowBaseY = endY + Math.sin(this.angle) * this.arrowLength;
  
          double arrowLeftX = arrowBaseX
              + Math.cos(this.angle + Math.PI / 2.0) * this.arrowWidth;
          double arrowLeftY = arrowBaseY
              + Math.sin(this.angle + Math.PI / 2.0) * this.arrowWidth;
  
          double arrowRightX = arrowBaseX
  