The JFreeChart nodes are not installed by default, but the extension is available from the standard KNIME update site under the name KNIME JFreeChart.
The common part of these nodes is that you have to specify the appearance of the result in advance, and the focus is not on the view, but on the resulting image port object.
In the General Plot Options Configuration tab, you can specify the type of the resulting image (PNG or SVG), the size, the title, colors, and the font size (relative to the standard font for each item printed).
You can use the port objects in the reports, but you can also use them to check certain properties if you iterate through a loop and convert the result with Image To Table.
It is important to note that the customizable JFreeChart View tab is only available in freshly executed nodes. The generated image can be visualized either using the view or the image output.
In the JFreeChart View tab, you can customize (from the context menu) almost every aspect of the...