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1) About VerticalLineAnnotation, when I move the vertical line, which event I can use to get real time data?
2) Do the chart lib have the full method to calculate the Fast Fourier Transformation?

Version
v5.1.0
WPF VerticalLineAnnotation   fft
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1.) You can bind to VerticalLineAnnotation.X1 property. We have a similar example here https://www.scichart.com/example/wpf-chart-example-drag-horizontal-threshold/

2.) No, but our examples source code has a power-of-2 FFT in them. You are free to use this, or plug in a third-party FFT function into the charts.

Best regards,
Andrew

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