# Range Spline Area Chart \[Deprecated]

Range Spline Area chart is used to represent the difference between low and high Y-values. 

**How to display range spline area chart using Bunifu Dataviz**

Simply locate Bunifu Dataviz control in your toolbox and drag it to the location on your form where you would like to display it. 

We will use button click event handler to display our chart called render\_range\_spline\_area

**C# code**

{% tabs %}
{% tab title="C#" %}

```csharp
private void render()
{
    
    var canvas = new Bunifu.Dataviz.WinForms.BunifuDatavizAdvanced.Canvas();
    var datapoint = new Bunifu.Dataviz.WinForms.BunifuDatavizAdvanced.DataPoint(Bunifu.Dataviz.WinForms.BunifuDatavizAdvanced._type.Bunifu_rangeSplineArea);
    
    datapoint.addxy("new Date (2002,11,10)", new JArray(16.23, 17.99).ToString());
    datapoint.addxy("new Date (2002, 11, 9)", new JArray(15.95, 19.25).ToString());
    datapoint.addxy("new Date (2002, 11, 8)", new JArray(11.30, 16.88).ToString());
    datapoint.addxy("new Date (2002, 11, 7)", new JArray(13.29, 14.28).ToString());
    datapoint.addxy("new Date (2002, 11, 6)", new JArray(15.23, 16.45).ToString());
    datapoint.addxy("new Date (2002, 11, 5)", new JArray(13.70, 16.50).ToString());
    datapoint.addxy("new Date (2002, 11, 4)", new JArray(17.50, 19.00).ToString());
    datapoint.addxy("new Date (2002, 11, 3)", new JArray(19.50, 20.85).ToString());
    datapoint.addxy("new Date (2002, 11, 2)", new JArray(20.07, 21.44).ToString());
    datapoint.addxy("new Date (2002, 11, 1)", new JArray(25.00, 26.70).ToString());
    
    canvas.addData(datapoint);
    bunifuDataViz1.Render(canvas);
    
}
```

{% endtab %}

{% tab title="VB.NET" %}

```
Private Sub render()
    
    Dim canvas = New Bunifu.Dataviz.WinForms.BunifuDatavizAdvanced.Canvas()
    Dim datapoint = New Bunifu.Dataviz.WinForms.BunifuDatavizAdvanced.DataPoint(Bunifu.DataViz.WinForms.BunifuDataViz._type.Bunifu_rangeSplineArea)
    
    datapoint.addxy("new Date (2002,11,10)", New JArray(16.23, 17.99).ToString())
    datapoint.addxy("new Date (2002, 11, 9)", New JArray(15.95, 19.25).ToString())
    datapoint.addxy("new Date (2002, 11, 8)", New JArray(11.30, 16.88).ToString())
    datapoint.addxy("new Date (2002, 11, 7)", New JArray(13.29, 14.28).ToString())
    datapoint.addxy("new Date (2002, 11, 6)", New JArray(15.23, 16.45).ToString())
    datapoint.addxy("new Date (2002, 11, 5)", New JArray(13.70, 16.50).ToString())
    datapoint.addxy("new Date (2002, 11, 4)", New JArray(17.50, 19.00).ToString())
    datapoint.addxy("new Date (2002, 11, 3)", New JArray(19.50, 20.85).ToString())
    datapoint.addxy("new Date (2002, 11, 2)", New JArray(20.07, 21.44).ToString())
    datapoint.addxy("new Date (2002, 11, 1)", New JArray(25.00, 26.70).ToString())
    
    canvas.addData(datapoint)
    bunifuDataViz1.Render(canvas)
    
End Sub
```

{% endtab %}
{% endtabs %}

In order to display range spline area chart we need the following controls:

*  **Bunifu Data Viz** - This is the container for our chart
*  **Bunifu Canvas** - This is the middle layer between the data viz (container) and the dataset
*  **Bunifu Data Point** - This will contain the data that we want to represent as pairs of X and Y coordinates

Bunifu Range Spline Area simply works by populating the Bunifu Datapoint control with “points”, described by the X coordinate (the first parameter of the addxy method) and an array of 2 coordinates, specifying the vertical limits of a line that needs to be checked by the spline. The curved shape is obtained automatically.

On running the code you should see something like this:

![](https://downloads.intercomcdn.com/i/o/73643685/41bf58fdbc11868fe93d5f08/range-spline-area-chart%5B1%5D.png)

That's it!

We hope Bunifu Dataviz will help you bring out the best data visualization for your data in your application. 

Should you have feedback or suggestions please send us via chat on the bottom right corner of the screen. 


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