Overview

The WinUI Spline Chart is similar to a line chart, but instead of connecting data points with straight lines, the data points are connected by smooth Bezier curves.

WinUI Spline Chart Documentation

WinUI Spline Chart

Key Features

Different WinUI Spline Chart

Spline types

Four different types of rendering: Natural, monotonic, cardinal, and clamped.

WinUI Vertical spline chart

Vertical spline chart

Rotate the spline chart to plot data vertically and view data from a different perspective.

WinUI Spline Chart showing empty point aka null point

Empty/null point chart

Empty or null data points are elegantly handled in spline charts.

WinUI Spline Chart with multiple axes

Multiple axes

Use multiple axes to plot different data sets that widely vary from one another.

Code guideline

Get started with the WinUI Spline Charts using a few simple lines of XAML and C# code example, as demonstrated below:

xaml
c#
<Window x:Class="ChartExample.MainPage"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="using:ChartExample"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
        xmlns:chart="using:Syncfusion.UI.Xaml.Charts"
        mc:Ignorable="d"
        Title="WinUI Spline Chart" Height="450" Width="700">

    <Grid>
        <chart:SfCartesianChart Height="300" Width="500">
            <!--Setting DataContext-->
            <chart:SfCartesianChart.DataContext>
                <local:ViewModel/>
            </chart:SfCartesianChart.DataContext>

            <!--Initialize the horizontal axis for the WinUI Chart-->
            <chart:SfCartesianChart.XAxes>
                <chart:CategoryAxis/>
            </chart:SfCartesianChart.XAxes>

            <!--Initialize the vertical axis for the WinUI Chart-->
            <chart:SfCartesianChart.YAxes>
                <chart:NumericalAxis/>
            </chart:SfCartesianChart.YAxes>
           
            <!--Adding Spline Series to the WinUI Chart-->
            <chart:SplineSeries 
                        ItemsSource="{Binding Data}" 
                        XBindingPath="Month"
                        YBindingPath="Target">
            </chart:SplineSeries>
        </chart:SfCartesianChart>
    </Grid>
</Window>
public class Model
{
    public string Month { get; set; }

    public double Target { get; set; }

    public Model(string xValue, double yValue)
    {
        Month = xValue;
        Target = yValue;
    }
}

public class ViewModel
{
    public ObservableCollection<Model> Data { get; set; }

    public ViewModel()
    {
        Data = new ObservableCollection<Model>()
        {
            new Model("Jan", 50),
            new Model("Feb", 70),
            new Model("Mar", 65),
            new Model("Apr", 57),
            new Model("May", 48), 
        };
    }
}