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Provides examples that demonstrate how to use ta4j
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/*
  The MIT License (MIT)

  Copyright (c) 2014-2017 Marc de Verdelhan & respective authors (see AUTHORS)

  Permission is hereby granted, free of charge, to any person obtaining a copy of
  this software and associated documentation files (the "Software"), to deal in
  the Software without restriction, including without limitation the rights to
  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
  the Software, and to permit persons to whom the Software is furnished to do so,
  subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package ta4jexamples.indicators;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.DatasetRenderingOrder;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.CandlestickRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.Second;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.DefaultHighLowDataset;
import org.jfree.data.xy.OHLCDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import org.ta4j.core.Bar;
import org.ta4j.core.TimeSeries;
import org.ta4j.core.indicators.helpers.ClosePriceIndicator;
import ta4jexamples.loaders.CsvTradesLoader;

import java.awt.*;
import java.util.Date;

/**
 * This class builds a traditional candlestick chart.
 */
public class CandlestickChart {

    /**
     * Builds a JFreeChart OHLC dataset from a ta4j time series.
     * @param series a time series
     * @return an Open-High-Low-Close dataset
     */
    private static OHLCDataset createOHLCDataset(TimeSeries series) {
        final int nbBars = series.getBarCount();

        Date[] dates = new Date[nbBars];
        double[] opens = new double[nbBars];
        double[] highs = new double[nbBars];
        double[] lows = new double[nbBars];
        double[] closes = new double[nbBars];
        double[] volumes = new double[nbBars];

        for (int i = 0; i < nbBars; i++) {
            Bar bar = series.getBar(i);
            dates[i] = new Date(bar.getEndTime().toEpochSecond() * 1000);
            opens[i] = bar.getOpenPrice().doubleValue();
            highs[i] = bar.getMaxPrice().doubleValue();
            lows[i] = bar.getMinPrice().doubleValue();
            closes[i] = bar.getClosePrice().doubleValue();
            volumes[i] = bar.getVolume().doubleValue();
        }

        return new DefaultHighLowDataset("btc", dates, highs, lows, opens, closes, volumes);
    }

    /**
     * Builds an additional JFreeChart dataset from a ta4j time series.
     * @param series a time series
     * @return an additional dataset
     */
    private static TimeSeriesCollection createAdditionalDataset(TimeSeries series) {
        ClosePriceIndicator indicator = new ClosePriceIndicator(series);
        TimeSeriesCollection dataset = new TimeSeriesCollection();
        org.jfree.data.time.TimeSeries chartTimeSeries = new org.jfree.data.time.TimeSeries("Btc price");
        for (int i = 0; i < series.getBarCount(); i++) {
            Bar bar = series.getBar(i);
            chartTimeSeries.add(new Second(new Date(bar.getEndTime().toEpochSecond() * 1000)), indicator.getValue(i).toDouble());
        }
        dataset.addSeries(chartTimeSeries);
        return dataset;
    }

    /**
     * Displays a chart in a frame.
     * @param chart the chart to be displayed
     */
    private static void displayChart(JFreeChart chart) {
        // Chart panel
        ChartPanel panel = new ChartPanel(chart);
        panel.setFillZoomRectangle(true);
        panel.setMouseWheelEnabled(true);
        panel.setPreferredSize(new java.awt.Dimension(740, 300));
        // Application frame
        ApplicationFrame frame = new ApplicationFrame("Ta4j example - Candlestick chart");
        frame.setContentPane(panel);
        frame.pack();
        RefineryUtilities.centerFrameOnScreen(frame);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        /*
          Getting time series
         */
        TimeSeries series = CsvTradesLoader.loadBitstampSeries();

        /*
          Creating the OHLC dataset
         */
        OHLCDataset ohlcDataset = createOHLCDataset(series);

        /*
          Creating the additional dataset
         */
        TimeSeriesCollection xyDataset = createAdditionalDataset(series);

        /*
          Creating the chart
         */
        JFreeChart chart = ChartFactory.createCandlestickChart(
                "Bitstamp BTC price",
                "Time",
                "USD",
                ohlcDataset,
                true);
        // Candlestick rendering
        CandlestickRenderer renderer = new CandlestickRenderer();
        renderer.setAutoWidthMethod(CandlestickRenderer.WIDTHMETHOD_SMALLEST);
        XYPlot plot = chart.getXYPlot();
        plot.setRenderer(renderer);
        // Additional dataset
        int index = 1;
        plot.setDataset(index, xyDataset);
        plot.mapDatasetToRangeAxis(index, 0);
        XYLineAndShapeRenderer renderer2 = new XYLineAndShapeRenderer(true, false);
        renderer2.setSeriesPaint(index, Color.blue);
        plot.setRenderer(index, renderer2);
        // Misc
        plot.setRangeGridlinePaint(Color.lightGray);
        plot.setBackgroundPaint(Color.white);
        NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis();
        numberAxis.setAutoRangeIncludesZero(false);
        plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD);

        /*
          Displaying the chart
         */
        displayChart(chart);
    }
}