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Programming language: Java
Tags: Science     Projects    
Latest version: v3.6.3

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README

XChart XChart

XChart is a light weight Java library for plotting data.

Description

XChart is a light-weight and convenient library for plotting data designed to go from data to chart in the least amount of time possible and to take the guess-work out of customizing the chart style.

Simplest Example

Create a XYChart instance via QuickChart, add a series of data to it, and either display it or save it as a bitmap.


double[] xData = new double[] { 0.0, 1.0, 2.0 };
double[] yData = new double[] { 2.0, 1.0, 0.0 };

// Create Chart
XYChart chart = QuickChart.getChart("Sample Chart", "X", "Y", "y(x)", xData, yData);

// Show it
new SwingWrapper(chart).displayChart();

// Save it
BitmapEncoder.saveBitmap(chart, "./Sample_Chart", BitmapFormat.PNG);

// or save it in high-res
BitmapEncoder.saveBitmapWithDPI(chart, "./Sample_Chart_300_DPI", BitmapFormat.PNG, 300);

Intermediate Example

Create a XYChart via a XYChartBuilder, style chart, add a series to it, style series, and display chart.


// Create Chart
XYChart chart = new XYChartBuilder().width(600).height(500).title("Gaussian Blobs").xAxisTitle("X").yAxisTitle("Y").build();

// Customize Chart
chart.getStyler().setDefaultSeriesRenderStyle(XYSeriesRenderStyle.Scatter);
chart.getStyler().setChartTitleVisible(false);
chart.getStyler().setLegendPosition(LegendPosition.InsideSW);
chart.getStyler().setMarkerSize(16);

// Series
chart.addSeries("Gaussian Blob 1", getGaussian(1000, 1, 10), getGaussian(1000, 1, 10));
XYSeries series = chart.addSeries("Gaussian Blob 2", getGaussian(1000, 1, 10), getGaussian(1000, 0, 5));
series.setMarker(SeriesMarkers.DIAMOND);

new SwingWrapper(chart).displayChart();

Advanced Example

Create a XYChart via a XYChartBuilder, style chart, add a series to it, add chart to XChartPanel, embed in Java Swing App, and display GUI.


// Create Chart
final XYChart chart = new XYChartBuilder().width(600).height(400).title("Area Chart").xAxisTitle("X").yAxisTitle("Y").build();

// Customize Chart
chart.getStyler().setLegendPosition(LegendPosition.InsideNE);
chart.getStyler().setDefaultSeriesRenderStyle(XYSeriesRenderStyle.Area);

// Series
chart.addSeries("a", new double[] { 0, 3, 5, 7, 9 }, new double[] { -3, 5, 9, 6, 5 });
chart.addSeries("b", new double[] { 0, 2, 4, 6, 9 }, new double[] { -1, 6, 4, 0, 4 });
chart.addSeries("c", new double[] { 0, 1, 3, 8, 9 }, new double[] { -2, -1, 1, 0, 1 });

// Schedule a job for the event-dispatching thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {

  @Override
  public void run() {

    // Create and set up the window.
    JFrame frame = new JFrame("Advanced Example");
    frame.setLayout(new BorderLayout());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // chart
    JPanel chartPanel = new XChartPanel<XYChart>(chart);
    frame.add(chartPanel, BorderLayout.CENTER);

    // label
    JLabel label = new JLabel("Blah blah blah.", SwingConstants.CENTER);
    frame.add(label, BorderLayout.SOUTH);

    // Display the window.
    frame.pack();
    frame.setVisible(true);
  }
});

To make it real-time, simply call updateXYSeries on the XYChart instance to update the series data, followed by revalidate() and repaint() on the XChartPanel instance to repaint.

Features

  • [x] No required additional dependencies
  • [x] Multiple Y-Axis charts
  • [x] Line charts
  • [x] Step charts
  • [x] Scatter charts
  • [x] Area charts
  • [x] Step Area charts
  • [x] Bar charts
  • [x] Histogram charts
  • [x] Pie charts
  • [x] Donut charts
  • [x] Bubble charts
  • [x] Stick charts
  • [x] Dial charts
  • [x] Radar charts
  • [x] OHLC charts
  • [x] Box charts
  • [x] Heat maps
  • [x] Error bars
  • [x] Logarithmic axes
  • [x] Number, Date, Bubble and Category X-Axis
  • [x] Multiple series
  • [x] Tool tips
  • [x] Extensive customization
  • [x] Themes - XChart, GGPlot2, Matlab
  • [x] Right-click, Save-As...
  • [x] User-defined axes range
  • [x] Definable legend placement
  • [x] CSV import and export
  • [x] High resolution chart export
  • [x] Export as PNG, JPG, BMP, GIF with custom DPI setting
  • [x] Export SVG, EPS using optional de.erichseifert.vectorgraphics2d library
  • [x] Export PDF using optional pdfbox-graphics2d library
  • [x] Real-time charts
  • [x] Java 8 and up

Chart Types

Currently, there are 5 major chart types. Each type has its corresponding ChartBuilder, Styler and Series.

Chart Type Builder Styler Series Allowed Data Types Default Series Render Style
XYChart XYChartBuilder XYStyler XYSeries Number, Date Line
CategoryChart CategoryChartBuilder CategoryStyler CategorySeries Number, Date, String Bar
PieChart PieChartBuilder PieStyler PieSeries String Pie
BubbleChart BubbleChartBuilder BubbleStyler BubbleSeries Number, Date Round
DialChart DialChartBuilder DialStyler DialSeries double Round
RadarChart RadarChartBuilder RadarStyler RadarSeries double[] Round
OHLCChart OHLCChartBuilder OHLCStyler OHLCSeries OHLC with Date Candle
BoxChart BoxChartBuilder BoxStyler BoxSeries Number, Date, String Box
HeatMapChart HeatMapChartBuilder HeatMapStyler HeatMapSeries Number, Date, String --

The different Stylers contain chart styling methods specific to the corresponding chart type as well as common styling methods common across all chart types.

XYChart

XYChart charts take Date or Number data types for the X-Axis and Number data types for the Y-Axis. For both axes, the tick marks are auto generated to span the range and domain of the data in evenly-spaced intervals.

Series render styles include: Line, Scatter, Area, Step and StepArea.

CategoryChart

CategoryChart charts take Date, Number or String data types for the X-Axis and Number data types for the Y-Axis. For the X-Axis, each category is given its own tick mark.

Series render styles include: Bar, Line, Scatter, Area and Stick.

PieChart

PieChart charts take String data types for the pie slice name and Number data types for the pie slice value.

Series render styles include: Pie and Donut.

BubbleChart

BubbleChart charts take Date or Number data types for the X-Axis and Number data types for the Y-Axis and bubble sizes.

Series render styles include: Round and in the near future Square.

DialChart

DialChart charts take a double to set the position of the dial pointer.

RadarChart

RadarChart charts take a double[] of values between 0 and 1 to set the position of radar node.

Series render styles include: Polygon and Circle.

OHLCChart

OHLCChart charts take Date data types for the X-Axis and 4 Number data types for the Y-Axis. For both axes, the tick marks are auto generated to span the range and domain of the data in evenly-spaced intervals.

Series render styles include: Candle, HiLo.

BoxChart

BoxChart charts take String data (seriesNames) types for the X-Axis and Number data types for the Y-Axis. Each box chart is calculated from the corresponding series yData. Create a BoxChart via a BoxChartBuilder, style chart, add a series to it.

// Create Chart
BoxChart chart =
    new BoxChartBuilder().title("box plot demo").build();

// Choose a calculation method
chart.getStyler().setBoxplotCalCulationMethod(BoxplotCalCulationMethod.N_LESS_1_PLUS_1);
chart.getStyler().setToolTipsEnabled(true);

// Series
chart.addSeries("boxOne", Arrays.asList(1,2,3,4));
new SwingWrapper<BoxChart>(chart).displayChart();

Four calculation methods for boxplots:

  • "N_PLUS_1": determine the position of the quartile, where Qi is = i (n + 1) / 4, where i = 1, 2, and 3. n represents the number of items contained in the sequence. Calculate the corresponding quartile based on location.
  • "N_LESS_1": Determine the position of the quartile, where Qi is = i (n-1) / 4, where i = 1, 2, and 3. n represents the number of items contained in the sequence. Calculate the corresponding quartile based on location.
  • "NP": Determine the position of the quartile, where Qi is np = (i * n) / 4, where i = 1, 2, and 3. n represents the number of items contained in the sequence. If np is not an integer, Qi = X [np + 1]; If np is an integer, Qi = (X [np] + X [np + 1]) / 2.
  • "N_LESS_1_PLUS_1": Determine the position of the quartile, where Qi is = i (n-1) / 4 + 1, where i = 1, 2, 3. n represents the number of items contained in the sequence. Calculate the corresponding quartile based on location.

Interquartile range, IQR = Q3-Q1.

Upper whisker = Q3 + 1.5 * IQR = Q3 + 1.5 * (Q3 - Q1), if Upper whisker is greater than the maximum value of yData, Upper whisker = maximum value of yData.

Lower whisker = Q1 - 1.5 * IQR = Q1 - 1.5 * (Q3 -Q1), if the lower whisker is less than the minimum value of yData, the lower whisker = the minimum value of yData.

E.g:

An example of a set of sequence numbers: 12, 15, 17, 19, 20, 23, 25, 28, 30, 33, 34, 35, 36, 37

  • "N_PLUS_1": Q1's position = (14 + 1) /4=3.75, Q1 = 0.25 × third term + 0.75 × fourth term = 0.25 × 17 + 0.75 × 19 = 18.5;
  • "N_LESS_1": Q1's location = (14-1) /4=3.25, Q1 = 0.75 × third term + 0.25 × fourth term = 0.75 × 17 + 0.25 × 19 = 17.5;
  • "NP": Q1's position = 14 * 0.25 = 3.5, Q1 = 19;
  • "N_LESS_1_PLUS_1": Q1's location = (14-1) / 4 + 1 = 4.25 Q1 = 0.75 × the fourth term + 0.25 × the fifth term = 0.75 × 19 + 0.25 × 20 = 19.25.

HeatMapChart

HeatMapChart take Date, Number or String data types for the X-Axis, Y-Axis.

Real-time Java Charts using XChart

Creating real-time charts is as simple as calling updateXYSeries for one or more series objects through the XYChart instance and triggering a redraw of the JPanel containing the chart. This works for all chart types including XYChart, CategoryChart, BubbleChart and PieChart, for which example source code can be found here. Examples demonstrate using the SwingWrapper with repaintChart() method as well as XChartPanel with revalidate() and repaint().

The following sample code used to generate the above real-time chart can be found here.

public class SimpleRealTime {

  public static void main(String[] args) throws Exception {

    double phase = 0;
    double[][] initdata = getSineData(phase);

    // Create Chart
    final XYChart chart = QuickChart.getChart("Simple XChart Real-time Demo", "Radians", "Sine", "sine", initdata[0], initdata[1]);

    // Show it
    final SwingWrapper<XYChart> sw = new SwingWrapper<XYChart>(chart);
    sw.displayChart();

    while (true) {

      phase += 2 * Math.PI * 2 / 20.0;

      Thread.sleep(100);

      final double[][] data = getSineData(phase);

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

        @Override
        public void run() {

          chart.updateXYSeries("sine", data[0], data[1], null);
          sw.repaintChart();
        }
      });
    }

  }

  private static double[][] getSineData(double phase) {

    double[] xData = new double[100];
    double[] yData = new double[100];
    for (int i = 0; i < xData.length; i++) {
      double radians = phase + (2 * Math.PI / xData.length * i);
      xData[i] = radians;
      yData[i] = Math.sin(radians);
    }
    return new double[][] { xData, yData };
  }
}

Chart Customization

All the styling options can be found in one of two possible places: 1) the Chart's Styler or 2) the series' set methods. With this chart customization design, all customization options can be quickly "discovered" using an IDE's built in "Content Assist". With centralized styling like this, there is no need to hunt around the entire charting API to find that one customization you're looking for - it's all right in one spot!

Customizing Axis Tick Values & Axis Tick Labels

XChart automatically creates axis ticks and axis labels.

Default axis placement can be altered with chart.getStyler().setXAxisTickMarkSpacingHint(spacingHint);.

Default axis label patterns can be altered with one of:

  • chart.getStyler().setDatePattern(datePattern)
  • chart.getStyler().setXAxisDecimalPattern(pattern);
  • chart.getStyler().setYAxisDecimalPattern(pattern);

You can also create custom axis placements and axis labels. Create a map containing x -> label mappings:

  • x : value where the tick will be drawn (this value is in xData space, not in pixel space).
  • label: Tick label. If it is null, tick will be generated with a " " label.
      Map<Object, Object> customXAxisTickLabelsMap = new HashMap<>();
      customXAxisTickLabelsMap.put(0, "zero");
      customXAxisTickLabelsMap.put(3, "3.5");
      customXAxisTickLabelsMap.put(5, " ");
      customXAxisTickLabelsMap.put(9, "nine");
      chart.setXAxisLabelOverrideMap(customXAxisTickLabelsMap);

      Map<Object, Object> customYAxisTickLabelsMap = new HashMap<>();
      customYAxisTickLabelsMap.put(1.0, "max c");
      customYAxisTickLabelsMap.put(6.0, "max b");
      customYAxisTickLabelsMap.put(9.0, "max a");
      chart.setYAxisLabelOverrideMap(customYAxisTickLabelsMap);

For category charts another way to create custom axis places is using category names in first series:

     Map<Object, Object> tickLabelOverrideMap = new HashMap<Object, Object>();

      Map<Object, Object> customTickLabelsMap = new HashMap<>();
      customTickLabelsMap.put("A", "-A-");
      customTickLabelsMap.put("D", "+D+");
      chart.setXAxisLabelOverrideMap(customTickLabelsMap);

Whenever you use setXAxisLabelOverrideMap the auto-generated tick labels will be replaced meaning none of the tick labels will be shown besides the ones provided by you in the override map.

Multiple Axes

XChart has multiple y axes feature. Y offset is calculated according to the y axis the series configured. Max y value in this axis is calculated according to the series on this axis only. To set the y group:

    series.setYAxisGroup(axisGroup);   

To manually change max/min of axis group:

    ((AxesChartStyler) chart.getStyler()).setYAxisMax(axisGroup, 200.0);

Axis can be drawn on the left (default) or on the right of the chart:

    chart.getStyler().setYAxisGroupPosition(axisGroup, Styler.YAxisPosition.Right);

To set the Y axes titles:

    chart.setYAxisGroupTitle(0, "A");
    chart.setYAxisGroupTitle(1, "B");

Chart Themes

XChart ships with three different themes: Default XChart, GGPlot2 and Matlab. Using a different theme is as simple as setting the Chart's theme with the theme method of the ChartBuilder.

XYChart chart = new XYChartBuilder().width(800).height(600).theme(ChartTheme.Matlab).build();

What's Next?

Now go ahead and study some more examples, download the thing and provide feedback.

Getting Started

Non-Maven

Download Jar: http://knowm.org/open-source/xchart/xchart-change-log

Maven

The XChart release artifacts are hosted on Maven Central.

Add the XChart library as a dependency to your pom.xml file:

    <dependency>
        <groupId>org.knowm.xchart</groupId>
        <artifactId>xchart</artifactId>
        <version>3.6.3</version>
    </dependency>

For snapshots, add the following to your pom.xml file:

    <repository>
      <id>sonatype-oss-snapshot</id>
      <snapshots/>
      <url>https://oss.sonatype.org/content/repositories/snapshots</url>
    </repository>

    <dependency>
      <groupId>org.knowm.xchart</groupId>
      <artifactId>xchart</artifactId>
      <version>3.6.4-SNAPSHOT</version>
    </dependency>

Snapshots can be manually downloaded from Sonatype: https://oss.sonatype.org/content/groups/public/org/knowm/xchart/xchart/

SBT

To use XChart with the Scala Build Tool (SBT) add the following to your build.sbt

libraryDependencies += "org.knowm.xchart" % "xchart" % "3.6.3" exclude("de.erichseifert.vectorgraphics2d", "VectorGraphics2D") withSources()

Building with Maven

general

mvn clean package  
mvn javadoc:aggregate  

Formatting

mvn com.coveo:fmt-maven-plugin:format

Formats your code using google-java-format which follows Google's code styleguide.

If you want your IDE to stick to the same format, check out the available configuration plugins:

Eclipse

Download google-java-format-eclipse-plugin_*.jar and place in /Applications/Eclipse Java.app/Contents/Eclipse/dropins. Restart Eclipse. Select the plugin in Preferences > Java > Code Style > Formatter > Formatter Implementation.

IntelliJ

In the plugins section in IntelliJ search for google-java-format and install the plugin. Restart IntelliJ.

Running Demo

  • Linux: execute command java -cp xchart-demo-3.6.3.jar:xchart-3.6.3.jar org.knowm.xchart.demo.XChartDemo.

  • Windows: In the cmd command window, execute the command java -cp xchart-demo-3.6.3.jar;xchart-3.6.3.jar org.knowm.xchart.demo.XChartDemo; In the PowerShell command window, execute the command java -cp "xchart-demo-3.6.3.jar;xchart-3.6.3.jar" org.knowm.xchart.demo.XChartDemo.

E.g:

cd /path/to/xchart-demo/jar/
java -cp xchart-demo-3.6.3.jar:xchart-3.6.3.jar org.knowm.xchart.demo.XChartDemo

Bugs

Please report any bugs or submit feature requests to XChart's Github issue tracker.

Continuous Integration

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