gt:                     xxWidth = Math.abs(endPos - startPos);
context: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2005, 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.]
   *
   * ------------------------
   * CandlestickRenderer.java
   * ------------------------
   * (C) Copyright 2001-2004, by Object Refinery Limited.
   *
   * Original Authors:  David Gilbert (for Object Refinery Limited);
   *                    Sylvain Vieujot;
   * Contributor(s):    Richard Atkinson;
   *                    Christian W. Zuckschwerdt;
   *                    Jerome Fisher;
   *
   * $Id: CandlestickRenderer.java,v 1.7.2.1 2005/10/25 20:56:21 mungady Exp $
   *
   * Changes
   * -------
   * 13-Dec-2001 : Version 1.  Based on code in the (now redundant) 
   *               CandlestickPlot class, written by Sylvain Vieujot (DG);
   * 23-Jan-2002 : Added DrawInfo parameter to drawItem() method (DG);
   * 28-Mar-2002 : Added a property change listener mechanism so that renderers 
   *               no longer need to be immutable.  Added properties for up and 
   *               down colors (DG);
   * 04-Apr-2002 : Updated with new automatic width calculation and optional 
   *               volume display, contributed by Sylvain Vieujot (DG);
   * 09-Apr-2002 : Removed translatedRangeZero from the drawItem() method, and 
   *               changed the return type of the drawItem method to void, 
   *               reflecting a change in the XYItemRenderer interface.  Added 
   *               tooltip code to drawItem() method (DG);
   * 25-Jun-2002 : Removed redundant code (DG);
   * 05-Aug-2002 : Small modification to drawItem method to support URLs for HTML 
   *               image maps (RA);
   * 19-Sep-2002 : Fixed errors reported by Checkstyle (DG);
   * 25-Mar-2003 : Implemented Serializable (DG);
   * 01-May-2003 : Modified drawItem() method signature (DG);
   * 30-Jun-2003 : Added support for PlotOrientation (for completeness, this 
   *               renderer is unlikely to be used with a HORIZONTAL 
   *               orientation) (DG);
   * 30-Jul-2003 : Modified entity constructor (CZ);
   * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
   * 29-Aug-2003 : Moved maxVolume calculation to initialise method (see bug 
   *               report 796619) (DG);
   * 02-Sep-2003 : Added maxCandleWidthInMilliseconds as workaround for bug 
   *               796621 (DG);
   * 08-Sep-2003 : Changed ValueAxis API (DG);
   * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
   * 13-Oct-2003 : Applied patch from Jerome Fisher to improve auto width 
   *               calculations (DG);
   * 23-Dec-2003 : Fixed bug where up and down paint are used incorrectly (DG);
   * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);
   * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 
   *               getYValue() (DG);
   * 
   */
  
  package org.jfree.chart.renderer.xy;
  
  import java.awt.AlphaComposite;
  import java.awt.Color;
  import java.awt.Composite;
  import java.awt.Graphics2D;
  import java.awt.Paint;
  import java.awt.Shape;
  import java.awt.Stroke;
  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.axis.ValueAxis;
  import org.jfree.chart.entity.EntityCollection;
  import org.jfree.chart.entity.XYItemEntity;
  import org.jfree.chart.event.RendererChangeEvent;
  import org.jfree.chart.labels.HighLowItemLabelGenerator;
  import org.jfree.chart.labels.XYToolTipGenerator;
  import org.jfree.chart.plot.CrosshairState;
  import org.jfree.chart.plot.PlotOrientation;
  import org.jfree.chart.plot.PlotRenderingInfo;
  import org.jfree.chart.plot.XYPlot;
  import org.jfree.data.xy.IntervalXYDataset;
  import org.jfree.data.xy.OHLCDataset;
  import org.jfree.data.xy.XYDataset;
  import org.jfree.io.SerialUtilities;
  import org.jfree.ui.RectangleEdge;
  import org.jfree.util.PublicCloneable;
  
  /**
   * A renderer that draws candlesticks on an {@link XYPlot} (requires a 
   * {@link OHLCDataset}).
   * <P>
   * This renderer does not include code to calculate the crosshair point for the 
   * plot.
   *
   * @author Sylvain Vieujot
   */
  public class CandlestickRenderer extends AbstractXYItemRenderer 
                                   implements XYItemRenderer, 
                                              Cloneable,
                                              PublicCloneable,
                                              Serializable {
              
      /** For serialization. */
      private static final long serialVersionUID = 50390395841817121L;
      
      /** The average width method. */                                          
      public static final int WIDTHMETHOD_AVERAGE = 0;
      
      /** The smallest width method. */
      public static final int WIDTHMETHOD_SMALLEST = 1;
      
      /** The interval data method. */
      public static final int WIDTHMETHOD_INTERVALDATA = 2;
  
      /** The method of automatically calculating the candle width. */
      private int autoWidthMethod = WIDTHMETHOD_AVERAGE;
  
      /** 
       * The number (generally between 0.0 and 1.0) by which the available space 
       * automatically calculated for the candles will be multiplied to determine
       * the actual width to use. 
       */
      private double autoWidthFactor = 4.5 / 7;
  
      /** The minimum gap between one candle and the next */
      private double autoWidthGap = 0.0;
  
      /** The candle width. */
      private double candleWidth;
      
      /** The maximum candlewidth in milliseconds. */
      private double maxCandleWidthInMilliseconds = 1000.0 * 60.0 * 60.0 * 20.0;
      
      /** Temporary storage for the maximum candle width. */
      private double maxCandleWidth;
  
      /** 
       * The paint used to fill the candle when the price moved up from open to 
       * close. 
       */
      private transient Paint upPaint;
  
      /** 
       * The paint used to fill the candle when the price moved down from open 
       * to close. 
       */
      private transient Paint downPaint;
  
      /** A flag controlling whether or not volume bars are drawn on the chart. */
      private boolean drawVolume;
      
      /** Temporary storage for the maximum volume. */
      private transient double maxVolume;
  
      /**
       * Creates a new renderer for candlestick charts.
       */
      public CandlestickRenderer() {
          this(-1.0);
      }
  
      /**
       * Creates a new renderer for candlestick charts.
       * <P>
       * Use -1 for the candle width if you prefer the width to be calculated 
       * automatically.
       *
       * @param candleWidth  The candle width.
       */
      public CandlestickRenderer(double candleWidth) {
          this(candleWidth, true, new HighLowItemLabelGenerator());
      }
  
      /**
       * Creates a new renderer for candlestick charts.
       * <P>
       * Use -1 for the candle width if you prefer the width to be calculated 
       * automatically.
       *
       * @param candleWidth  the candle width.
       * @param drawVolume  a flag indicating whether or not volume bars should 
       *                    be drawn.
       * @param toolTipGenerator  the tool tip generator. <code>null</code> is 
       *                          none.
       */
      public CandlestickRenderer(double candleWidth, boolean drawVolume,
                                 XYToolTipGenerator toolTipGenerator) {
  
          super();
          setToolTipGenerator(toolTipGenerator);
          this.candleWidth = candleWidth;
          this.drawVolume = drawVolume;
          this.upPaint = Color.green;
          this.downPaint = Color.red;
  
      }
  
      /**
       * Returns the width of each candle.
       *
       * @return The candle width.
       * 
       * @see #setCandleWidth(double)
       */
      public double getCandleWidth() {
          return this.candleWidth;
      }
  
      /**
       * Sets the candle width.
       * <P>
       * If you set the width to a negative value, the renderer will calculate
       * the candle width automatically based on the space available on the chart.
       *
       * @param width  The width.
       * @see #setAutoWidthMethod(int)
       * @see #setAutoWidthGap(double)
       * @see #setAutoWidthFactor(double)
       * @see #setMaxCandleWidthInMilliseconds(double)
       */
      public void setCandleWidth(double width) {
          if (width != this.candleWidth) {
              this.candleWidth = width;
              notifyListeners(new RendererChangeEvent(this));
          }
      }
  
      /**
       * Returns the maximum width (in milliseconds) of each candle.
       *
       * @return The maximum candle width in milliseconds.
       */
      public double getMaxCandleWidthInMilliseconds() {
          return this.maxCandleWidthInMilliseconds;
      }
  
      /**
       * Sets the maximum candle width (in milliseconds).  
       *
       * @param millis  The maximum width.
       * @see #setCandleWidth(double)
       * @see #setAutoWidthMethod(int)
       * @see #setAutoWidthGap(double)
       * @see #setAutoWidthFactor(double)
       */
      public void setMaxCandleWidthInMilliseconds(double millis) {
          this.maxCandleWidthInMilliseconds = millis;
          notifyListeners(new RendererChangeEvent(this));
      }
  
      /**
       * Returns the method of automatically calculating the candle width.
       *
       * @return The method of automatically calculating the candle width.
       */
      public int getAutoWidthMethod() {
          return this.autoWidthMethod;
      }
  
      /**
       * Sets the method of automatically calculating the candle width.
       * <p>
       * <code>WIDTHMETHOD_AVERAGE</code>: Divides the entire display (ignoring 
       * scale factor) by the number of items, and uses this as the available 
       * width.<br>
       * <code>WIDTHMETHOD_SMALLEST</code>: Checks the interval between each 
       * item, and uses the smallest as the available width.<br>
       * <code>WIDTHMETHOD_INTERVALDATA</code>: Assumes that the dataset supports
       * the IntervalXYDataset interface, and uses the startXValue - endXValue as 
       * the available width.
       * <br>
       *
       * @param autoWidthMethod  The method of automatically calculating the 
       * candle width.
       *
       * @see #WIDTHMETHOD_AVERAGE
       * @see #WIDTHMETHOD_SMALLEST
       * @see #WIDTHMETHOD_INTERVALDATA
       * @see #setCandleWidth(double)
       * @see #setAutoWidthGap(double)
       * @see #setAutoWidthFactor(double)
       * @see #setMaxCandleWidthInMilliseconds(double)
       */
      public void setAutoWidthMethod(int autoWidthMethod) {
          if (this.autoWidthMethod != autoWidthMethod) {
              this.autoWidthMethod = autoWidthMethod;
              notifyListeners(new RendererChangeEvent(this));
          }
      }
  
      /**
       * Returns the factor by which the available space automatically 
       * calculated for the candles will be multiplied to determine the actual 
       * width to use.
       *
       * @return The width factor (generally between 0.0 and 1.0).
       */
      public double getAutoWidthFactor() {
          return this.autoWidthFactor;
      }
  
      /**
       * Sets the factor by which the available space automatically calculated 
       * for the candles will be multiplied to determine the actual width to use.
       *
       * @param autoWidthFactor The width factor (generally between 0.0 and 1.0).
       * @see #setCandleWidth(double)
       * @see #setAutoWidthMethod(int)
       * @see #setAutoWidthGap(double)
       * @see #setMaxCandleWidthInMilliseconds(double)
       */
      public void setAutoWidthFactor(double autoWidthFactor) {
          if (this.autoWidthFactor != autoWidthFactor) {
              this.autoWidthFactor = autoWidthFactor;
              notifyListeners(new RendererChangeEvent(this));
          }
      }
  
      /**
       * Returns the amount of space to leave on the left and right of each 
       * candle when automatically calculating widths.
       *
       * @return The gap.
       */
      public double getAutoWidthGap() {
          return this.autoWidthGap;
      }
  
      /**
       * Sets the amount of space to leave on the left and right of each candle 
       * when automatically calculating widths.
       *
       * @param autoWidthGap The gap.
       * @see #setCandleWidth(double)
       * @see #setAutoWidthMethod(int)
       * @see #setAutoWidthFactor(double)
       * @see #setMaxCandleWidthInMilliseconds(double)
       */
      public void setAutoWidthGap(double autoWidthGap) {
          if (this.autoWidthGap != autoWidthGap) {
              this.autoWidthGap = autoWidthGap;
              notifyListeners(new RendererChangeEvent(this));
          }
      }
  
      /**
       * Returns the paint used to fill candles when the price moves up from open
       * to close.
       *
       * @return The paint.
       */
      public Paint getUpPaint() {
          return this.upPaint;
      }
  
      /**
       * Sets the paint used to fill candles when the price moves up from open
       * to close.
       * <P>
       * Registered property change listeners are notified that the
       * "CandleStickRenderer.upPaint" property has changed.
       *
       * @param paint The paint.
       */
      public void setUpPaint(Paint paint) {
          this.upPaint = paint;
          notifyListeners(new RendererChangeEvent(this));
      }
  
      /**
       * Returns the paint used to fill candles when the price moves down from
       * open to close.
       *
       * @return The paint.
       */
      public Paint getDownPaint() {
          return this.downPaint;
      }
  
      /**
       * Sets the paint used to fill candles when the price moves down from open
       * to close.
       * <P>
       * Registered property change listeners are notified that the
       * "CandleStickRenderer.downPaint" property has changed.
       *
       * @param paint  The paint.
       */
      public void setDownPaint(Paint paint) {
          this.downPaint = paint;
          notifyListeners(new RendererChangeEvent(this));
      }
  
      /**
       * Returns a flag indicating whether or not volume bars are drawn on the
       * chart.
       *
       * @return <code>true</code> if volume bars are drawn on the chart.
       */
      public boolean drawVolume() {
          return this.drawVolume;
      }
  
      /**
       * Sets a flag that controls whether or not volume bars are drawn in the
       * background.
       *
       * @param flag The flag.
       */
      public void setDrawVolume(boolean flag) {
          if (this.drawVolume != flag) {
              this.drawVolume = flag;
              notifyListeners(new RendererChangeEvent(this));
          }
      }
  
      /**
       * Initialises the renderer then returns the number of 'passes' through the
       * data that the renderer will require (usually just one).  This method 
       * will be called before the first item is rendered, giving the renderer 
       * an opportunity to initialise any state information it wants to maintain.
       * The renderer can do nothing if it chooses.
       *
       * @param g2  the graphics device.
       * @param dataArea  the area inside the axes.
       * @param plot  the plot.
       * @param dataset  the data.
       * @param info  an optional info collection object to return data back to 
       *              the caller.
       *
       * @return The number of passes the renderer requires.
       */
      public XYItemRendererState initialise(Graphics2D g2,
                                            Rectangle2D dataArea,
                                            XYPlot plot,
                                            XYDataset dataset,
                                            PlotRenderingInfo info) {
            
          // calculate the maximum allowed candle width from the axis...
          ValueAxis axis = plot.getDomainAxis();
          double x1 = axis.getLowerBound();
          double x2 = x1 + this.maxCandleWidthInMilliseconds;
          RectangleEdge edge = plot.getDomainAxisEdge();
          double xx1 = axis.valueToJava2D(x1, dataArea, edge);
          double xx2 = axis.valueToJava2D(x2, dataArea, edge);
          this.maxCandleWidth = Math.abs(xx2 - xx1); 
              // Absolute value, since the relative x 
              // positions are reversed for horizontal orientation
          
          // calculate the highest volume in the dataset... 
          if (this.drawVolume) {
              OHLCDataset highLowDataset = (OHLCDataset) dataset;
              this.maxVolume = 0.0;
              for (int series = 0; series < highLowDataset.getSeriesCount(); 
                   series++) {
                  for (int item = 0; item < highLowDataset.getItemCount(series); 
                       item++) {
                      double volume = highLowDataset.getVolumeValue(series, item);
                      if (volume > this.maxVolume) {
                          this.maxVolume = volume;
                      }
                      
                  }    
              }
          }
          
          return new XYItemRendererState(info);
      }
  
      /**
       * Draws the visual representation of a single data item.
       *
       * @param g2  the graphics device.
       * @param state  the renderer state.
       * @param dataArea  the area within which the plot is being drawn.
       * @param info  collects info about the drawing.
       * @param plot  the plot (can be used to obtain standard color 
       *              information etc).
       * @param domainAxis  the domain axis.
       * @param rangeAxis  the range axis.
       * @param dataset  the dataset.
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       * @param crosshairState  crosshair information for the plot 
       *                        (<code>null</code> permitted).
       * @param pass  the pass index.
       */
      public void drawItem(Graphics2D g2, 
                           XYItemRendererState state,
                           Rectangle2D dataArea,
                           PlotRenderingInfo info,
                           XYPlot plot, 
                           ValueAxis domainAxis, 
                           ValueAxis rangeAxis,
                           XYDataset dataset, 
                           int series, 
                           int item,
                           CrosshairState crosshairState,
                           int pass) {
  
          boolean horiz;
          PlotOrientation orientation = plot.getOrientation();
          if (orientation == PlotOrientation.HORIZONTAL) {
              horiz = true;
          }
          else if (orientation == PlotOrientation.VERTICAL) {
              horiz = false;
          }
          else {
              return;
          }
          
          // setup for collecting optional entity info...
          EntityCollection entities = null;
          if (info != null) {
              entities = info.getOwner().getEntityCollection();
          }
  
          OHLCDataset highLowData = (OHLCDataset) dataset;
  
          Number x = highLowData.getX(series, item);
          Number yHigh = highLowData.getHigh(series, item);
          Number yLow = highLowData.getLow(series, item);
          Number yOpen = highLowData.getOpen(series, item);
          Number yClose = highLowData.getClose(series, item);
  
          RectangleEdge domainEdge = plot.getDomainAxisEdge();
          double xx = domainAxis.valueToJava2D(x.doubleValue(), dataArea, 
                  domainEdge);
  
          RectangleEdge edge = plot.getRangeAxisEdge();
          double yyHigh = rangeAxis.valueToJava2D(yHigh.doubleValue(), dataArea,
                  edge);
          double yyLow = rangeAxis.valueToJava2D(yLow.doubleValue(), dataArea, 
                  edge);
          double yyOpen = rangeAxis.valueToJava2D(yOpen.doubleValue(), dataArea, 
                  edge);
          double yyClose = rangeAxis.valueToJava2D(yClose.doubleValue(), dataArea,
                  edge);
  
          double volumeWidth;
          double stickWidth;
          if (this.candleWidth > 0) {
              // These are deliberately not bounded to minimums/maxCandleWidth to
              //  retain old behaviour.
              volumeWidth = this.candleWidth;
              stickWidth = this.candleWidth;
          }
          else {
              double xxWidth = 0;
              int itemCount;
              switch (this.autoWidthMethod) {
              
                  case WIDTHMETHOD_AVERAGE:
                      itemCount = highLowData.getItemCount(series);
                      if (horiz) {
                          xxWidth = dataArea.getHeight() / itemCount;
                      }
                      else {
                          xxWidth = dataArea.getWidth() / itemCount;
                      }
                      break;
              
                  case WIDTHMETHOD_SMALLEST:
                      // Note: It would be nice to pre-calculate this per series
                      itemCount = highLowData.getItemCount(series);
                      double lastPos = -1;
                      xxWidth = dataArea.getWidth();
                      for (int i = 0; i < itemCount; i++) {
                          double pos = domainAxis.valueToJava2D(
                              highLowData.getXValue(series, i), dataArea, 
                              domainEdge
                          );
                          if (lastPos != -1) {
                              xxWidth = Math.min(
                                  xxWidth, Math.abs(pos - lastPos)
                              );
                          }
                          lastPos = pos;
                      }
                      break;
              
                  case WIDTHMETHOD_INTERVALDATA:
                      IntervalXYDataset intervalXYData 
                          = (IntervalXYDataset) dataset;
                      double startPos = domainAxis.valueToJava2D(
                          intervalXYData.getStartXValue(series, item), dataArea, 
                          plot.getDomainAxisEdge()
                      );
                      double endPos = domainAxis.valueToJava2D(
                          intervalXYData.getEndXValue(series, item), dataArea, 
                          plot.getDomainAxisEdge()
                      );
  