RealtimeChart01.java

/**
 * Copyright 2015-2017 Knowm Inc. (http://knowm.org) and contributors.
 * Copyright 2011-2015 Xeiam LLC (http://xeiam.com) and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.knowm.xchart.demo.charts.realtime;

import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.CopyOnWriteArrayList;

import org.knowm.xchart.SwingWrapper;
import org.knowm.xchart.XYChart;
import org.knowm.xchart.XYChartBuilder;
import org.knowm.xchart.demo.charts.ExampleChart;
import org.knowm.xchart.style.Styler.ChartTheme;

/**
 * Real-time XY Chart
 * <p>
 * Demonstrates the following:
 * <ul>
 * <li>real-time chart updates with SwingWrapper
 * <li>Matlab Theme
 */
public class RealtimeChart01 implements ExampleChart<XYChart> {

  private XYChart xyChart;

  private List<Double> yData;
  public static final String SERIES_NAME = "series1";

  public static void main(String[] args) {

    // Setup the panel
    final RealtimeChart01 realtimeChart01 = new RealtimeChart01();
    realtimeChart01.go();
  }

  private void go() {

    final SwingWrapper<XYChart> swingWrapper = new SwingWrapper<XYChart>(getChart());
    swingWrapper.displayChart();

    // Simulate a data feed
    TimerTask chartUpdaterTask = new TimerTask() {

      @Override
      public void run() {

        updateData();

        javax.swing.SwingUtilities.invokeLater(new Runnable() {

          @Override
          public void run() {

            swingWrapper.repaintChart();
          }
        });
      }
    };

    Timer timer = new Timer();
    timer.scheduleAtFixedRate(chartUpdaterTask, 0, 500);
  }

  @Override
  public XYChart getChart() {

    yData = getRandomData(5);

    // Create Chart
    xyChart = new XYChartBuilder().width(500).height(400).theme(ChartTheme.Matlab).title("Real-time XY Chart").build();
    xyChart.addSeries(SERIES_NAME, null, yData);

    return xyChart;
  }

  public void updateData() {

    // Get some new data
    List<Double> newData = getRandomData(1);

    yData.addAll(newData);

    // Limit the total number of points
    while (yData.size() > 20) {
      yData.remove(0);
    }

    xyChart.updateXYSeries(SERIES_NAME, null, yData, null);
  }

  private List<Double> getRandomData(int numPoints) {

    List<Double> data = new CopyOnWriteArrayList<Double>();
    for (int i = 0; i < numPoints; i++) {
      data.add(Math.random() * 100);
    }
    return data;
  }
}