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Free Java library for displaying plots


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GRAL is a free Java library for displaying plots (graphs, diagrams, and charts). The acronym GRAL simply stands for GRAphing Library.

Maintainer wanted

GRAL is looking for a new maintainer. If you are interested, please contact


  • Ready-to-use classes for data management
  • Data processing and filtering (smoothing, rescaling, statistics, histograms)
  • Many different plot types: xy/scatter plot, bubble plot, line plot, area plot, bar plot, pie plot, donut plot, box-and-whisker plot, raster plot
  • Legends: horizontal and vertical
  • Various axis types: linear axes, logarithmic axes, arbitrary number of axes
  • Several file formats are supported as data sources or data sinks (CSV, bitmap image data, audio file data)
  • Exporting plots in bitmap and vector file formats (PNG, GIF, JPEG, EPS, PDF, SVG)
  • Small footprint (about 300 kilobytes)


Without build management system

You can just add gral-core.jar to the classpath of your project.

Using GRAL with Maven

If you want to use GRAL with your Maven project you will have to include it as a dependency in your pom.xml:


Using GRAL with Gradle

dependencies {
    compile group: 'de.erichseifert.gral', name: 'gral-core', version: '0.11'

Using GRAL with sbt

libraryDependencies += "de.erichseifert.gral" % "gral-core" % "0.11"

Building GRAL from source code

The source package contains all files necessary to build GRAL from scratch using the Gradle software project management and comprehension tool. Like Makefile files the build.gradle files are used by Gradle to generate various distribution or documentation files.

Building a JAR file of the library core

In case you just want to build the core of the library to get started execute the following command in the gral-core directory:

$ gradle assemble

This will generate a JAR archive named gral-core in the build/libs directory. This JAR file can be added to the class path of your application.

Building a JAR file of the examples

In case you just want to build the core of the library to get started execute the following command in the gral-examples directory:

$ gradle assemble

This will generate a JAR archive for the examples in the build/libs directory which can be used together with the library core to run example applications.

Building the documentation

The GRAL Gradle project offers three sources for documentation:

  1. The JavaDoc files that can be generated with:

    $ gradle javadoc
  2. The reports found in build/reports containing a project various information like test results, test coverage, etc. To build these files just execute:

    $ gradle report
  3. A book-like documentation in the reStructuredText format is available in the file documentation_en.rst.

Using GRAL in an IDE

The Gradle project can also be used in your favorite development environment like Eclipse or NetBeans. For further information look at the following descriptions on the Gradle website

Once you have installed an appropriate Gradle plug-in for your IDE you will be able to import the GRAL project found in this folder.


To build GRAL from source, you need a Gradle version higher than 4.0 and at least Java 7.