GroupBy Bar Chart (JFreeChart)

This view shows a bar chart visualizing the values in the selected data columns for the selected nominal column. The nominal column has to be unique, so each value occurs only once. The color of the bars can be handled through the color-manager.It doesn't support highlighting. For general settings of the generated image, see the "General Plot Options" Tab.

Options

GroupBy Bar Chart Options

X column: Select the column that contains the unique! nominal values to be plotted
Value columns: Selects the columns that contain the heights of the bars
xLabels rotation angle: Changes the way xLabels are arranged. An angle of 90 degree means a vertical alignment. Possible values range between -90 and 90 degrees.
Use row color: Set flag if the colors from the data table should be used.
Align bars with same label together: If selected all bars belonging to one label (different value columns) are aligned together. Otherwise the bars belonging to the same value column are plotted next to each other. If the option is chosen, the color of the bars is chosen randomly.
Use bar shadows: Set flag if the bars should throw shadows or not.
Label for X axis: If activated the X-axis is named accordingly
Label for Y axis: If activated the Y-axis is named accordingly
Show legend: Switches the legend on/off

General Plot Options

Type of Image: The type of the created image can either be png or svg. PNGs are mostly smaller, SVGs provide details about plot and the possibility to be changed individually.
Title of Graph: The title of the graph shown above the generated image. If the title is not activated, no title will be shown.
Width of Image (in pixel): The width of the generated image, not the plot width.
Height of Image (in pixel): The height of the generated image, not the plot height.
Background Color: The color of the background of the image. Hence this color is used for the area behind and around the plot as well as behind potential axis and legends.
Plot Background Color: The color of the background of the plot. Hence this color is used for the empty space in a plot.
Plot Background Alpha: The transparency of the plot background can be modified using an additional alpha value. An alpha value of 1 does not change the background transparency. Decreasing the alpha value will increase the plot background transparency.
Scale Font Size: Factor changes the font sizes within the JFreeChart view. A value greater the 1 increases all view fonts, a value between 0 and 1 decrease them.

Input Ports

: Data table with at least one nominal column

Output Ports

: The image of the plot (SVG or PNG)

Popular Predecessors

Popular Successors

Views

Bar chart: Displays the bar chart for the input data.

Workflows

Developers

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Installation

To use this node in KNIME, install the extension KNIME JFreeChart from the below update site following our NodePit Product and Node Installation Guide:

v5.9

A zipped version of the software site can be downloaded here.

Plugin provider: KNIME AG, Zurich, Switzerland

Plugin version: 5.9.0.v202511132127

On NodePit since: 2025-12-11

Last update: 2026-01-09

KNIME versions: Since v3.6

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