Hi
I am using ChartView for visualizing some data.
The data is a list of doubles and strings. The string is a category and the double is a value.
The data is shown as points – and it works fine (see attached image)
Vertical axis is a LinearAxis.
Horizontal axis is a CategoricalAxis.
The series is a PointSeries.
I now want to use the trackball feature to highlight the point closest to the mouse. I have used this feature before on non-categorical axis and it worked fine. But in this case only one point for each category gets highlighted. The point highlightet is always the first point in the list in each category.
Do you have any idea what is wrong?
/Flemming Rosenbrandt
1 Answer, 1 is accepted
0
Hello Flemming,
Indeed, the trackball will show the first point of the series in the hovered category. Actually, the trackball works with the direction in which the trackball is moving - in your case the horizontal axis, so the closest data point will be the closest in the X direction. The vertical axis won't be taken into account. To achieve your requirement you can use can create a custom trackball using chart annotations and implement some custom snapping there. You can see such approach shown in the TrackBallLikeAnnotations SDK example. You can use the sample and extend it to take into account also the vertical mouse position.
I hope this helps.
Regards,
Martin Ivanov
Progress Telerik
Indeed, the trackball will show the first point of the series in the hovered category. Actually, the trackball works with the direction in which the trackball is moving - in your case the horizontal axis, so the closest data point will be the closest in the X direction. The vertical axis won't be taken into account. To achieve your requirement you can use can create a custom trackball using chart annotations and implement some custom snapping there. You can see such approach shown in the TrackBallLikeAnnotations SDK example. You can use the sample and extend it to take into account also the vertical mouse position.
I hope this helps.
Regards,
Martin Ivanov
Progress Telerik
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