create a candlestick chart

[gladstone]

I hava tried hard to create a candlestick chart. I used the source code from jfreechart, and have some unknown problems about creating the dataset.

can anyone paste a full source code of a simple candlestick chart to me as a reference? it would be very helpful for me to start with.

[RoyW]

Code: Select all

import org.jfree.chart.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.CandlestickRenderer;
import org.jfree.data.xy.*;

import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.net.URL;
import java.text.*;
import java.util.*;
import java.util.List;

public class CandlestickDemo extends JFrame {
    public CandlestickDemo(String stockSymbol) {
        super("CandlestickDemo");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        DateAxis    domainAxis       = new DateAxis("Date");
        NumberAxis  rangeAxis        = new NumberAxis("Price");
        CandlestickRenderer renderer = new CandlestickRenderer();
        XYDataset   dataset          = getDataSet(stockSymbol);

        XYPlot mainPlot = new XYPlot(dataset, domainAxis, rangeAxis, renderer);

        //Do some setting up, see the API Doc
        renderer.setSeriesPaint(0, Color.BLACK);
        renderer.setDrawVolume(false);
        rangeAxis.setAutoRangeIncludesZero(false);
        domainAxis.setTimeline( SegmentedTimeline.newMondayThroughFridayTimeline() );

        //Now create the chart and chart panel
        JFreeChart chart = new JFreeChart(stockSymbol, null, mainPlot, false);
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(600, 300));

        this.add(chartPanel);
        this.pack();
    }
    protected AbstractXYDataset getDataSet(String stockSymbol) {
        //This is the dataset we are going to create
        DefaultOHLCDataset result = null;
        //This is the data needed for the dataset
        OHLCDataItem[] data;

        //This is where we go get the data, replace with your own data source
        data = getData(stockSymbol);

        //Create a dataset, an Open, High, Low, Close dataset
        result = new DefaultOHLCDataset(stockSymbol, data);

        return result;
    }
    //This method uses yahoo finance to get the OHLC data
    protected OHLCDataItem[] getData(String stockSymbol) {
        List<OHLCDataItem> dataItems = new ArrayList<OHLCDataItem>();
        try {
            String strUrl= "http://ichart.finance.yahoo.com/table.csv?s="+stockSymbol+"&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();
        }
        //Data from Yahoo is from newest to oldest. Reverse so it is oldest to newest
        Collections.reverse(dataItems);

        //Convert the list into an array
        OHLCDataItem[] data = dataItems.toArray(new OHLCDataItem[dataItems.size()]);

        return data;
    }

    public static void main(String[] args) {
        new CandlestickDemo("MSFT").setVisible(true);
    }
}

[sawo01]

Is it possible to put Moving Average to this chart?
I can display them in separate window, but I would like to see them on the same diagram, but I don't know, how to do it.
Could anybody help me, please?

[RoyW]

Replace this line

Code: Select all

        XYPlot mainPlot = new XYPlot(dataset, domainAxis, rangeAxis, renderer);

with this code

Code: Select all

        XYPlot mainPlot = new XYPlot(dataset, domainAxis, rangeAxis, renderer);

        final long ONE_DAY = 24 * 60 * 60 * 1000;
        XYLineAndShapeRenderer maRenderer = new XYLineAndShapeRenderer(true, false);
        XYDataset              maSataset  = MovingAverage.createMovingAverage(dataset, "MA", 30 * ONE_DAY, 0);
        mainPlot.setRenderer(1, maRenderer);
        mainPlot.setDataset (1, maSataset);

[sawo01]

Thanks, this is amazing. It works fine.
Is it hard to modify the app and make the dataset refreshable?
I mean, I would like to display more candlesticks, but not in the same time.

I have a big DB with more than 500.000 candlesticks. Can I display in one time just e.g. 200 OHCL bars, put a Theard.sleep(100), and refresh the dataset?

[ashokgawas]

I want crosshairs moving with the mouse cursor on the candlestick chart.. can anyone send me an example??

[fans_chart]

but works on 1.0.9

Code: Select all

import org.jfree.chart.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.CandlestickRenderer;
import org.jfree.data.xy.*;

import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.net.URL;
import java.text.*;
import java.util.*;
import java.util.List;

public class CandlestickDemo extends JFrame {
    public CandlestickDemo(String stockSymbol) {
        super("CandlestickDemo");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        DateAxis    domainAxis       = new DateAxis("Date");
        NumberAxis  rangeAxis        = new NumberAxis("Price");
        CandlestickRenderer renderer = new CandlestickRenderer();
        XYDataset   dataset          = getDataSet(stockSymbol);

        XYPlot mainPlot = new XYPlot(dataset, domainAxis, rangeAxis, renderer);

        //Do some setting up, see the API Doc
        renderer.setSeriesPaint(0, Color.BLACK);
        renderer.setDrawVolume(false);
        rangeAxis.setAutoRangeIncludesZero(false);
        domainAxis.setTimeline( SegmentedTimeline.newMondayThroughFridayTimeline() );

        //Now create the chart and chart panel
        JFreeChart chart = new JFreeChart(stockSymbol, null, mainPlot, false);
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(600, 300));

        this.add(chartPanel);
        this.pack();
    }
    protected AbstractXYDataset getDataSet(String stockSymbol) {
        //This is the dataset we are going to create
        DefaultOHLCDataset result = null;
        //This is the data needed for the dataset
        OHLCDataItem[] data;

        //This is where we go get the data, replace with your own data source
        data = getData(stockSymbol);

        //Create a dataset, an Open, High, Low, Close dataset
        result = new DefaultOHLCDataset(stockSymbol, data);

        return result;
    }
    //This method uses yahoo finance to get the OHLC data
    protected OHLCDataItem[] getData(String stockSymbol) {
        List<OHLCDataItem> dataItems = new ArrayList<OHLCDataItem>();
        try {
            String strUrl= "http://ichart.finance.yahoo.com/table.csv?s="+stockSymbol+"&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();
        }
        //Data from Yahoo is from newest to oldest. Reverse so it is oldest to newest
        Collections.reverse(dataItems);

        //Convert the list into an array
        OHLCDataItem[] data = dataItems.toArray(new OHLCDataItem[dataItems.size()]);

        return data;
    }

    public static void main(String[] args) {
        new CandlestickDemo("MSFT").setVisible(true);
    }
}

[Jean-Paul]

BUG IN THE CODE: IMPORTANT FOR EVERYONE USING THE ABOVE CODE

I made an account just to warn everyone trying to use the code above (it took me a lot of hours to find this bug):

You have to use JFreeChart library v1.0.15 or higher or otherwise the JFrame will crash for certain random stock quotes.

If you want to know more, please read the following question I posted: http://stackoverflow.com/questions/1841 ... nce-quotes

I hope I can prevent future trouble for anyone. Good luck and enjoy the beautiful code (kudos to RoyW).

[david.gilbert]

It seems that this bug fix explains the difference in behaviour between 1.0.14 and 1.0.15:

http://sourceforge.net/p/jfreechart/code/2465/

[marioscelba]

Good tutorials,I think this is good way for learning.