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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?
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.
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