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Find Corresponding Interpolate Value in SfChart with Spline Type

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145564 Jun 28,2019 06:36 AM UTC Jul 1,2019 10:14 AM UTC WPF 1
Tags: SfChart
Xamarin Hunter
Asked On June 28, 2019 06:36 AM UTC

I've created SfChart as a spline type. I have two root arrays which have double type elements; the first one is X array and the next one is Y array. The element of each X array corresponds to an element of Y array. Like at below. These arrays contain more than ten float or int values.

double [] X = …

double [] Y = …

I want to find an interpolation value belong to spline with any method. It can be linear, non-linear, regression, cubic or more complex; not matter. 
I need the specific points between the X-Y data values which I used. I have known only the Y value of these points, but I can’t find the corresponding X value.
For example, Y=2 then X=? or X=5 then Y=?
I want to find interpolated value or shown on spline as a mouse tooltip. Is there any way to solve this?


Muneesh Kumar G [Syncfusion]
Replied On July 1, 2019 10:14 AM UTC

Hi Utemar, 
Greetings from Syncfusion,  
We have analyzed your requirement and you can achieve this by overriding TooltipTemplate in SplineSeries as per the below code snippet.  
Code snippet 
<chart:SplineSeries XBindingPath="XValue" YBindingPath="YValue" MouseMove="SplineSeries_MouseMove" 
                             ItemsSource="{Binding Data}" ShowTooltip="True"> 
                        <TextBlock > 
                            <Run Text="Q1 : "/> 
                            <Run Text="{Binding Q1}"/> 
Each SplineSegment have two intermediate points Q1 and Q2. You can get these values in series mouse move as per the below code snippet.  
Code snippet 
private void SplineSeries_MouseMove(object sender, MouseEventArgs e) 
            if(e.OriginalSource is Path ) 
                SplineSegment segment = (e.OriginalSource as Path).Tag as SplineSegment; 
                var q1 = segment.Q1; 
                var q2 = segment.Q2; 
We have prepared a sample based on this, please find the sample from the following location.  
Please let us know if you have any other queries.  
Muneesh Kumar G.  


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