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I have a chart with logarithmic X axis. When I draw the chart, the series is presented with “spikes” that don’t exist in the data.
If I enlarge the window and the chart, the series is “fixed”.

Please see the attached files. LogChart_wide window.png shows the chart correctly.

Also attached a text file with the raw data.

Any idea how to fix this?

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Hi Smadar,

Thanks for your question. I think this happens because of data resampling. SciChart makes predictions about data distribution and to reduce amount of things to render, but this doesn’t work with the LogarithmicAxis (because of data scaling).

This can be fixed quite easily, setting the ResamplingMode property on a RenderableSeries to “None”. You can find more info about existing resampling modes in the documentation. Please try this and let us know if it helps.

Also, just FYI, we have this issue logged and it is going to be fixed in one of future releases.

Best regards,

  • Andrew
    I should also add – it is on our roadmap for SciChart v5 to incorporate Logarithmic XAxis scaling into resampling algorithms
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Thanks! That helped alot

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