How to make mouse wheel zoom(setMouseWheelEnabled()) in Jfreechart only affect specific axis?

Question

When I enable the mouse wheel zoom in my chart using this code line:

chartPanel.setMouseWheelEnabled(true);

Scrolling the mouse wheel will zoom in/out both x and y axis. How can I disable mouse wheel zooming on one of the axis?

Jfreechart Version: 1.0.13

Answer 1

Use the ChartPanel methods setDomainZoomable() and setRangeZoomable() to control the axes individually. As a concrete example, edit createChartPanel() in this example as follows to enable zoom on the "Value" axis, while leaving the "Count" axis unchanged:

panel.setMouseWheelEnabled(true);
panel.setDomainZoomable(true);
panel.setRangeZoomable(false);

For convenience,

• Use the context menu to change the zoom settings as needed.

• Use zoom buttons such as these as needed.

• Use other applicable features described here.

Zoomed in:

Zoomed out: