I'm having a very hard time getting my data to show up.
I have my x axis set to go from 3700->900 (reversed!) and I have a single SampleDataSeries.
My calculation for sampling frequency is
series.SamplingFrequency = Math.Abs(1 / (this.XAxisDelta)); // Delta is -28
series.XAxisOffset = 900;// hardcoded for right now
my data array has samples[0] equating to 3700, and samples[99] 928 as stored in the array.
My issue is that when I map the trace to the graph, my data is reversed. Its assuming that samples[0] corresponds to the lowest X axis value i believe.
Is there a way for me to reverse the trace on disk without manually switching my data array around? It seems like the answer I need is to allow
XAxisOffset = 3700;
SamplingFrequency = -1/XaxisDelta, but the negative frequency breaks the graph
hopefully this makes sense and isn't just rambling.
Reversed x axis with sampledataseries
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- ArctionPasi
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Re: Reversed x axis with sampledataseries
Axes have Reversed property.
Isn't ViewXY.XAxes[0].Reversed = True suitable?
samples[0] represents the sample of lowest X value.
Isn't ViewXY.XAxes[0].Reversed = True suitable?
samples[0] represents the sample of lowest X value.
LightningChart Support Team, PT
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Re: Reversed x axis with sampledataseries
I was able to get the axis to show as reversed (my values go from RPM's 3700->900)
However, my sample data is also ordered with data[0] is the data at X=3700, and data[100] is X=900.
When i load the sample buffer in, the values are reversed because f the fact that the sample buffer always goes low x to high x.
Is there room anywhere for an enhancement where in the sample data, when you have offset and frequency, we can give it a negative frequency to show that it is decreasing with the X axis?
However, my sample data is also ordered with data[0] is the data at X=3700, and data[100] is X=900.
When i load the sample buffer in, the values are reversed because f the fact that the sample buffer always goes low x to high x.
Is there room anywhere for an enhancement where in the sample data, when you have offset and frequency, we can give it a negative frequency to show that it is decreasing with the X axis?
- ArctionPasi
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Re: Reversed x axis with sampledataseries
We can't promise enhancement like that, sorry.
Can't you use FreeformPointLineSeries, it accepts data in any order?
Can't you use FreeformPointLineSeries, it accepts data in any order?
LightningChart Support Team, PT
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Re: Reversed x axis with sampledataseries
Maybe using a difference series type is a better solution. We've been using SampleDataSeries up until now (which i believe has the best performance). The case where the X axis is reversed, maybe I can use a different series?
Its not a big deal right now to manually reverse the buffer However, in the future, people may want to flip-flop the axis around at will, it might need to change.
Is there a use case for negative sampling frequency on the SampleDataSeries.Frequency property? The way my math works out, the negative value is useful to me. I'm having to do Math.Abs when I set this property, but keep the negative value everywhere else.
Its not a big deal right now to manually reverse the buffer However, in the future, people may want to flip-flop the axis around at will, it might need to change.
Is there a use case for negative sampling frequency on the SampleDataSeries.Frequency property? The way my math works out, the negative value is useful to me. I'm having to do Math.Abs when I set this property, but keep the negative value everywhere else.
- ArctionPasi
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Re: Reversed x axis with sampledataseries
The real-time scrolling modes are built only for ascending data order. It's a major restructuring to implement negative sampling frequency for SampleDataSeries. Or to enable descending data order for PointLineSeries/AreaSeries/HighlowSeries. This is something we really can't promise.
Nothing prevents from changing from SampleDataSeries to FreeformPointLineSeries on the fly.
SampleDataSeries has better performance when data point count is high.
Nothing prevents from changing from SampleDataSeries to FreeformPointLineSeries on the fly.
SampleDataSeries has better performance when data point count is high.
LightningChart Support Team, PT
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Re: Reversed x axis with sampledataseries
I think using the different series type is definitely solution then. Right now, I'm reversing the array when the X range is descending (its much easier than modifying my code to work with the different series type).
I'll make the switch eventually.
Thanks for the info
I'll make the switch eventually.
Thanks for the info