Getting start and end (date) from the PrimaryAxis?

[Sascha]

Hi Syncfusion Support!

Is there any change to get and set the start (from) and end (to) value (for example date) for a zoomed PrimaryAxis of a SfChart? We are using so far ZoomPosition and ZoomFactor to have an experience for panning and zooming into our data. Of course, if we change start and end value of a SfChart the ZoomPosition and ZoomFactor have to recalculate to show the new "range" of data. 

Thank you!

regards,

Sascha

[Muneesh Kumar G]

Hi Sascha, 

 

Greetings from Syncfusion.  

 

We have analyzed your requirement and you can achieve this by getting calculated range in ActualRangeChanged event in axis and setting required range in event arguments as per the below code snippet.  

 

Code snippet 

    <chart:SfChart.PrimaryAxis> 

           <chart:CategoryAxis ActualRangeChanged="CategoryAxis_ActualRangeChanged"/> 

    </chart:SfChart.PrimaryAxis> 

 

 

        private void CategoryAxis_ActualRangeChanged(object sender, ActualRangeChangedEventArgs e) 

        { 

            double min = (double)e.ActualMinimum; 

            double max = (double)e.ActualMaximum; 

            e.ActualMinimum = min + 1; 

            e.ActualMaximum = max - 1; 

        } 

 

UG: https://help.syncfusion.com/wpf/sfchart/axis#events 

 

Hope this helps you.  

 

Regards,   

Muneesh Kumar G.   

 

[Sascha]

Hi Syncfusion Support!

Thank you for your answer!

Regrettably, we do not get the required data. 

Here two screenshots to explain our requirements in more detail.

This is our SfChart without any zooming or panning. 

Now we are zooming & panning into the data. 

From your code we only get the start and end date from the "whole chart series range". Here some log when the event is firing:

CategoryAxis_ActualRangeChanged - 20.02.2019 12:15:41 - 20.02.2019 12:59:59

CategoryAxis_ActualRangeChanged - 20.02.2019 12:15:41 - 20.02.2019 12:59:59

CategoryAxis_ActualRangeChanged - 20.02.2019 12:15:41 - 20.02.2019 12:59:59

Done with: Console.WriteLine($"CategoryAxis_ActualRangeChanged - {(DateTime)e.ActualMinimum} - {(DateTime)e.ActualMaximum}");

        

This meets exactly the dates from the first example. 

But we need 

 and 

If we have any chance to get these "dates"? It is not necessary that an event is firing. 

And, of course, we have to set these values for some important user experience! Perhaps a way to "recalculate" ZoomPosition and Factor? 

Thank you very much!

regards,

Sascha

[Muneesh Kumar G]

Hi Sascha, 

 

Thanks for your update.  

 

We have analyzed your requirement and you can achieve this by getting VisibleRange in axis and converting range values in to DateTime as per the below code snippet.  

 

Code snippet 

private void DateTimeAxis_ActualRangeChanged(object sender, ActualRangeChangedEventArgs e) 

        { 

            var range = xAxis.VisibleRange; 

 

            if (!double.IsNaN(range.Start) && !double.IsNaN(range.End)) 

            { 

                DateTime min = DateTime.FromOADate(range.Start); 

                DateTime max = DateTime.FromOADate(range.End); 

            } 

        } 

 

    <chart:SfChart.PrimaryAxis> 

                <chart:DateTimeAxis x:Name="xAxis" ActualRangeChanged="DateTimeAxis_ActualRangeChanged"/> 

            </chart:SfChart.PrimaryAxis> 

 

We have prepared a sample based on this, please find the sample from the following location.  

 

Sample: http://www.syncfusion.com/downloads/support/forum/142773/ze/WPF_Sample767089141 

 

Hope it helps you.  

 

Regards,  

Muneesh Kumar G.