Trendline slope and intercept are always zero

Thread ID:	Created:	Updated:	Platform:	Replies:
145296	Jun 16,2019 07:23 PM UTC	Jun 17,2019 06:44 AM UTC	UWP	1

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Tags: SfChart

Ben

Asked On June 16, 2019 07:23 PM UTC

Just as the title says: I can draw trendlines no problem, but when I try to access the Slope and Intercept properties, they're always zero.

My code produces the attached graph, and the following Debug.WriteLine() output:

Reference: Slope = 0, Intercept = 0
Measurement: Slope = 0, Intercept = 0

Here's the relevant code to add the trendlines and get to Slope and Intercept:

ReferenceScatterSeries.Trendlines.Clear();
MeasurementScatterSeries.Trendlines.Clear();

Trendline Trendline_R = new Trendline()
{
    Label = "Reference Cell",
    IsTrendlineVisible = true,
    Type = TrendlineType.Linear
};
Trendline Trendline_M = new Trendline()
{
    Label = "Measurement Cell",
    IsTrendlineVisible = true,
    Type = TrendlineType.Linear
};

ReferenceScatterSeries.Trendlines.Add(Trendline_R);
MeasurementScatterSeries.Trendlines.Add(Trendline_M);

Debug.WriteLine("Reference: Slope = " + Trendline_R.Slope.ToString() + ", Intercept = " + Trendline_R.Intercept.ToString());
Debug.WriteLine("Measurement: Slope = " + Trendline_M.Slope.ToString() + ", Intercept = " + Trendline_M.Intercept.ToString());

Attachment: Capture_3db2fd00.zip

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Muneesh Kumar G [Syncfusion]

Replied On June 17, 2019 06:44 AM UTC

Hi Ben,

Greetings from Syncfusion.

We have analyzed your requirement and you can achieve this by getting trendline’s Slope and Intercept in SfChart’s loaded event as per the below code snippet.

Code snippet

<syncfusion:SfChart x:Name="Chart" Margin="20" Loaded="Chart_Loaded">

…

Trendline Trendline_R, Trendline_M;

public MainPage()

{

this.InitializeComponent();

Trendline_R = new Trendline()

{

Label = "Reference Cell",

IsTrendlineVisible = true,

Type = TrendlineType.Linear

};

Trendline_M = new Trendline()

{

Label = "Measurement Cell",

IsTrendlineVisible = true,

Type = TrendlineType.Linear

};

series1.Trendlines.Add(Trendline_R);

series2.Trendlines.Add(Trendline_M);

}

private void Chart_Loaded(object sender, RoutedEventArgs e)

{

Debug.WriteLine("Reference: Slope = " + Trendline_R.Slope.ToString() + ", Intercept = " + Trendline_R.Intercept.ToString());

Debug.WriteLine("Measurement: Slope = " + Trendline_M.Slope.ToString() + ", Intercept = " + Trendline_M.Intercept.ToString());

}

Here we get the required details in loaded event, because SfChart needs some time to calculate their trendlines properties.

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

Sample: http://www.syncfusion.com/downloads/support/forum/145296/ze/UWP_Sample1065368857

Please let us know if you have any other queries.

Regards,

Muneesh Kumar G.

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Trendline slope and intercept are always zero

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