candlestickrenderer.java

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/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * ------------------------
 * CandlestickRenderer.java
 * ------------------------
 * (C) Copyright 2001-2003, by Object Refinery Limited.
 *
 * Original Authors:  David Gilbert (for Object Refinery Limited);
 *                    Sylvain Vieujot;
 * Contributor(s):    Richard Atkinson;
 *                    Christian W. Zuckschwerdt;
 *
 * $Id: CandlestickRenderer.java,v 1.14 2003/08/01 09:47:29 mungady Exp $
 *
 * Changes
 * -------
 * 13-Dec-2001 : Version 1.  Based on code in the CandlestickPlot class, written by Sylvain
 *               Vieujot, which now is redundant (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);
 * 
 */

package org.jfree.chart.renderer;

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.ChartRenderingInfo;
import org.jfree.chart.CrosshairInfo;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.labels.HighLowToolTipGenerator;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.HighLowDataset;
import org.jfree.data.XYDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;

/**
 * A renderer that draws candlesticks on an {@link XYPlot} (requires a {@link HighLowDataset}).
 *
 * @author Sylvain Vieujot
 */
public class CandlestickRenderer extends AbstractXYItemRenderer
                                 implements XYItemRenderer, Serializable {

    /** The candle width. */
    private double candleWidth;

    /** 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;

    /**
     * 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 HighLowToolTipGenerator());

    }

    /**
     * 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.
     */
    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.
     */
    public void setCandleWidth(double width) {

        if (width != this.candleWidth) {
            Double old = new Double(this.candleWidth);
            this.candleWidth = width;
            firePropertyChanged("CandleStickRenderer.candleWidth", old, new Double(width));
        }

    }

    /**
     * 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) {

        Paint old = this.upPaint;
        this.upPaint = paint;
        firePropertyChanged("CandleStickRenderer.upPaint", old, paint);

    }

    /**
     * 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) {

        Paint old = this.downPaint;
        this.downPaint = paint;
        firePropertyChanged("CandleStickRenderer.downPaint", old, paint);

    }

    /**
     * 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;
            firePropertyChanged("CandlestickRenderer.drawVolume", null, new Boolean(flag));
        }

    }

    /**
     * Draws the visual representation of a single data item.
     *
     * @param g2  the graphics device.
     * @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 crosshairInfo  information about crosshairs on a plot.
     * @param pass  the pass index.
     */
    public void drawItem(Graphics2D g2, Rectangle2D dataArea,
                         ChartRenderingInfo info,
                         XYPlot plot, ValueAxis domainAxis, ValueAxis rangeAxis,
                         XYDataset dataset, int series, int item,
                         CrosshairInfo crosshairInfo,
                         int pass) {
                             
        PlotOrientation orientation = plot.getOrientation();
        if (orientation == PlotOrientation.HORIZONTAL) {
            drawHorizontalItem(g2, dataArea, info, plot, domainAxis, rangeAxis, 
                               dataset, series, item, 
                               crosshairInfo, pass);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            drawVerticalItem(g2, dataArea, info, plot, domainAxis, rangeAxis, 
                             dataset, series, item, 
                             crosshairInfo, pass);
        }
    
    }

    /**
     * Draws the visual representation of a single data item.
     *
     * @param g2  the graphics device.
     * @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 crosshairInfo  information about crosshairs on a plot.
     * @param pass  the pass index.
     */
    public void drawHorizontalItem(Graphics2D g2, Rectangle2D dataArea,
                                   ChartRenderingInfo info,
                                   XYPlot plot, ValueAxis domainAxis, ValueAxis rangeAxis,
                                   XYDataset dataset, int series, int item,
                                   CrosshairInfo crosshairInfo,
                                   int pass) {   

        // setup for collecting optional entity info...
        EntityCollection entities = null;
        if (info != null) {
            entities = info.getEntityCollection();
        }

        HighLowDataset highLowData = (HighLowDataset) dataset;

        Number x = highLowData.getXValue(series, item);
        Number yHigh = highLowData.getHighValue(series, item);