Hello qq dow,
Thank you for writing.
To customize the trackball you can provide a new trackball content adapter. To do so you have to inherit from ChartTrackballContentAdapter
and override the methods you need. When your class is done you have to tell the trackball to use it like this:
Finally, to modify the point indicators of the trackball you have to set the intersection point paint. For example:
TrackballPresenter presenter = (TrackballPresenter) trackBall.getPopupPresenter();
Please write again if you need further assistance.
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