title: How to make mouse wheel zoom(setMouseWheelEnabled()) in Jfreechart only affect specific axis?
body: <p>When I enable the mouse wheel zoom in my chart using this code line:</p>
  <pre><code>chartPanel.setMouseWheelEnabled(true);
  </code></pre>
  <p>Scrolling the mouse wheel will zoom in/out <strong>both</strong> x and y axis. How can I disable mouse wheel zooming on <strong>one</strong> of the axis?</p>
  <p>Jfreechart Version: 1.0.13</p>