converting x axis data to DateTime

hi,
I’m trying to convert the current mouse X position to the DataTime of the data series the mouse is over:

        Point mousePoint = e.GetPosition(view.ChartSurface.ModifierSurface as UIElement);
        //var mouseDate = (DateTime)view.ChartSurface.XAxis.GetDataValue(mousePoint.X);
        ICoordinateCalculator&lt;double&gt; calc = view.ChartSurface.XAxis.GetCurrentCoordinateCalculator();
        double mouseDataValue = calc.GetDataValue(mousePoint.X);            
        var mouseDate = DateTime.FromOADate(mouseDataValue);

mouseDataValue returns the correct index of the data, but mouseDate always converts to the year 1900.
thanks!

WPF

tecman234 asked 9 years ago

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Answers (1)

Hi there,

I assume that you use CategoryDateTimeAxis because calc.GetDataValue(mousePoint.X) return data index. In this case you should convert index to data value using the same CoordinateCalculator object:

            var categoryCoordCalc = view.ChartSurface.XAxis.GetCurrentCoordinateCalculator() as ICategoryCoordinateCalculator;

            var dataPointIndex = categoryCoordCalc.GetDataValue(mousePoint.X);
            var xDataValue = categoryCoordCalc.TransformIndexToData(dataPointIndex);

            var mouseDate = DateTime.FromOADate(xDataValue);

Please, let us know if this helps!

Best regards,
Yuriy

Yuriy Zadereckiy answered 9 years ago

tecman234
9 years ago

Yuriy, Your suggestion worked with just a little type conversion tweak, and since the xDataValue is already a DateTime, I didn't neeed the FromOADate conversion. The final code is:

            Point mousePoint = e.GetPosition(view.ChartSurface.ModifierSurface as UIElement);

            var categoryCoordCalc = view.ChartSurface.XAxis.GetCurrentCoordinateCalculator() as ICategoryCoordinateCalculator;

            var dataPointIndex = (int)categoryCoordCalc.GetDataValue(mousePoint.X);
            var mouseDate = categoryCoordCalc.TransformIndexToData(dataPointIndex);

Thanks for the help!

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