about Volume

[developer78]

Hello Sir,
I'm having a candlestick chart, with volume indicators embedded with it.
I want to display this volume indicators separately ie, in a separate Frame in the same wondow?? is it possible
thanks....regards..

[alfacorsoft.com]

I have the same problem=(
i`m waiting for answer too!
--------------------------
support @ alfacorsoft.com

[RoyW]

Better late than never

Code: Select all

import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CombinedDomainXYPlot;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.CandlestickRenderer;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.data.xy.*;

import java.awt.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.List;

public class CandlestickVolumeDemo {
    public static void main(String[] args) {
        ChartFrame chartFrame = new ChartFrame("Candlestick + Volume Demo", buildChart());
        chartFrame.setSize(600,600);
        chartFrame.setVisible(true);
    }

    public static JFreeChart buildChart() {
        //Shared date axis
        DateAxis            domainAxis = new DateAxis("Date");

        //Build Candlestick Chart based on stock price OHLC
        OHLCDataset         priceDataset  = getPriceDataSet("MSFT");
        NumberAxis          priceAxis     = new NumberAxis("Price");
        CandlestickRenderer priceRenderer = new CandlestickRenderer();
        XYPlot              pricePlot     = new XYPlot(priceDataset, domainAxis, priceAxis, priceRenderer);
        priceRenderer.setSeriesPaint(0, Color.BLACK);
        priceRenderer.setDrawVolume(false);
        priceAxis.setAutoRangeIncludesZero(false);

        //Build Bar Chart for volume by wrapping price dataset with an IntervalXYDataset
        IntervalXYDataset   volumeDataset  = getVolumeDataset(priceDataset, 24 * 60 * 60 * 1000); // Each bar is 24 hours wide.
        NumberAxis          volumeAxis     = new NumberAxis("Volume");
        XYBarRenderer       volumeRenderer = new XYBarRenderer();
        XYPlot              volumePlot     = new XYPlot(volumeDataset, domainAxis, volumeAxis, volumeRenderer);
        volumeRenderer.setSeriesPaint(0, Color.BLUE);

        //Build Combined Plot
        CombinedDomainXYPlot mainPlot = new CombinedDomainXYPlot(domainAxis);
        mainPlot.add(pricePlot);
        mainPlot.add(volumePlot);

        return new JFreeChart("Microsoft", null, mainPlot, false);
    }

    protected static OHLCDataset getPriceDataSet(String symbol) {
        List<OHLCDataItem> dataItems = new ArrayList<OHLCDataItem>();
        try {
            String strUrl= "http://ichart.finance.yahoo.com/table.csv?s="+symbol+"&a=0&b=1&c=2008&d=3&e=30&f=2008&ignore=.csv";
            URL url = new URL(strUrl);
            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
            DateFormat df = new SimpleDateFormat("y-M-d");
            String inputLine;
            in.readLine();
            while ((inputLine = in.readLine()) != null) {
                StringTokenizer st = new StringTokenizer(inputLine, ",");
                Date date       = df.parse( st.nextToken() );
                double open     = Double.parseDouble( st.nextToken() );
                double high     = Double.parseDouble( st.nextToken() );
                double low      = Double.parseDouble( st.nextToken() );
                double close    = Double.parseDouble( st.nextToken() );
                double volume   = Double.parseDouble( st.nextToken() );
                double adjClose = Double.parseDouble( st.nextToken() );
                OHLCDataItem item = new OHLCDataItem(date, open, high, low, close, volume);
                dataItems.add(item);
            }
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        Collections.reverse(dataItems);
        OHLCDataItem[] data = dataItems.toArray(new OHLCDataItem[dataItems.size()]);
        return new DefaultOHLCDataset(symbol, data);
    }

    protected static IntervalXYDataset getVolumeDataset(final OHLCDataset priceDataset, final long barWidthInMilliseconds){
        return new AbstractIntervalXYDataset(){
            public int getSeriesCount() {
                return priceDataset.getSeriesCount();
            }
            public Comparable getSeriesKey(int series) {
                return priceDataset.getSeriesKey(series) + "-Volume";
            }
            public int getItemCount(int series) {
                return priceDataset.getItemCount(series);
            }
            public Number getX(int series, int item) {
                return priceDataset.getX(series, item);
            }
            public Number getY(int series, int item) {
                return priceDataset.getVolume(series,  item);
            }
            public Number getStartX(int series, int item) {
                return priceDataset.getX(series, item).doubleValue() - barWidthInMilliseconds/2;
            }
            public Number getEndX(int series, int item) {
                return priceDataset.getX(series, item).doubleValue() + barWidthInMilliseconds/2;
            }
            public Number getStartY(int series, int item) {
                return new Double(0.0);
            }
            public Number getEndY(int series, int item) {
                return priceDataset.getVolume(series,  item);
            }
        };
    }

}

[JFreeGuest]

Very nice!

Is it possible to define the height of the volume plot proportional to the price plot?

[RoyW]

Replace

Code: Select all

        mainPlot.add(pricePlot);
        mainPlot.add(volumePlot);

With

Code: Select all

        mainPlot.add(pricePlot,  4);
        mainPlot.add(volumePlot, 1);

Makes the ratio 4 to 1.