This might be a stupid question. 😀 But I tried several things and nothing seems to work…
I have a chart that has several different datasets that can be switched to. When I apply them and do zoom to extents it changes the Y Axis sometimes 1-15, sometimes 1-20, sometimes 1-25. So the chart zooms in/out, which looks nice.
However I would like to fix the initial zoom to be always be 1-20. If the chart is smaller or bigger than 20; that is fine; I just want the initial viewport to always zoom to be 1-20, when I switch the dataset. They can then zoom in/out or pan using gestures.
Any ideas on what API I need to call to zoom the chart to 1-20. (Please note, this is using a logarithmic scale on the Y-Axis — if it makes any differences).
So what do I need to call/set rather than calling the zoom to extents function.
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Hi Nathanael,
I’m not sure how you perform zoom extents in your application, but you just need to set VisibleRange and configure chart to not update it.
- If you use AutoRange.Always just set it to AutoRange.Never for YAxis.
- If you use ZoomExtentsModifier just set Direction = Direction2D.XDirection to disable zoom extents for YAxis
- If you use chart’s zoomExtents() method, then just use overload which affects only XAxis – zoomExtentsX()
Hope this will help you!
Best regards,
Yura
- Yura Khariton answered 3 years ago
To add to this. Zoom extents, always zooms to the extents of your data, always. I would suggest maybe a custom modifier? Override ChartModifierBase and the double tap gesture and set XAxis/YAxis.VisibleRange. We have loads of examples of custom modifiers for WPF, @Yura do we have one for Android?
I am currently using ZoomExtents() — However, I’m willing to use whatever works best. I don’t want to STOP zooming on the Y axis — I still want the user to be able to zoom it in and out. What I want to do is when I refresh the data, reset the zoom on the Y axis to be 1-20 again. So basically it would act like the zoomExtents command, but always zoom me to a preset Y Axis? Does that make sense?
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