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It applies to all ValueAxis subclasses (DateAxis, NumberAxis, ...)

If you're using a CategoryAxis then you can use axis.setCategoryLabelPositions(CategoryLabelPostions.UP_90)

To rotate the tick labels on a ValueAxis : axis.setVerticalTickLabels(true)

Thank you for your answer.
I tried to implement it but it actually changes the color of all the subtasks in a task. Do you know how I could modify it to change only the color of a subtask?

Any idea on how to proceed?

Hi! I just started using jfreechart and I have some difficulties with the gantt chart. I created a gantt chart with multiple subtasks. Some of the subtasks from the different tasks are connected and I'd like all the connected subtasks to change color when one of them is clicked. Does anyone know how...