Demonstrates the use of the SeriesSelectionModifier, which hooks into the ChartModifier API to select series on mouse-clicks. This complex, but easy to implement example uses many concepts in the ChartModifier API to bind legends and series together.

The selected series is styled via the SeriesSelectionModifier.SelectedSeriesStyle. A blanket style applied to any series which is selected. Also you can use the BaseRenderableSeries.SelectedSeriesStyle to achieve the same effect on an individual series level.

Finally, a LegendModifier exposes the currently selected series, and we can use a SciChartLegend to show the name of which series is selected.

Documentation Links

– ChartModifier API Articles
– Series Selection and Selected Series Styling API Documentation

// SeriesSelectionExampleView.xaml

<UserControl x:Class="SciChart.Examples.Examples.InspectDatapoints.SeriesSelectionExampleView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:s="http://schemas.abtsoftware.co.uk/scichart"
             Loaded="SeriesSelectionExampleView_OnLoaded"
             d:DesignHeight="400"
             d:DesignWidth="600"
             mc:Ignorable="d">

    <Grid>

        <s:SciChartSurface x:Name="sciChartSurface">

            <!--  Declare Axes  -->
            <s:SciChartSurface.XAxis>
                <s:NumericAxis AutoRange="Always" />
            </s:SciChartSurface.XAxis>

            <s:SciChartSurface.YAxes>
                <s:NumericAxis AxisAlignment="Right" Id="Right" />
                <s:NumericAxis AxisAlignment="Left" Id="Left" />
            </s:SciChartSurface.YAxes>


            <!--  Declare ChartModifiers  -->
            <s:SciChartSurface.ChartModifier>
                <s:ModifierGroup>

                    <!--  Provides Interactivity  -->
                    <s:RubberBandXyZoomModifier />
                    <s:XAxisDragModifier />
                    <s:YAxisDragModifier AxisId="Left" />
                    <s:YAxisDragModifier AxisId="Right" />
                    <s:ZoomExtentsModifier />

                    <!--  Provides selection of series and custom styling to the selected series  -->
                    <s:SeriesSelectionModifier>
                        <s:SeriesSelectionModifier.SelectedSeriesStyle>

                            <!--  When a series is selected (on click), apply this style  -->
                            <!--  Changes Stroke to white on click  -->
                            <!--  Applies a PointMarker on click  -->
                            <Style TargetType="s:BaseRenderableSeries">
                                <Setter Property="Stroke" Value="White" />
                                <Setter Property="PointMarkerTemplate">
                                    <Setter.Value>
                                        <!--  This is how we do PointMarkerTemplates in Scichart v2.0. You can either declare an EllipsePointMarker inline,  -->
                                        <!--  or, if temmplating (because you are sharing a style across many series), then use a ControlTemplate with a BasePointMarker,  -->
                                        <!--  or UIElement to replicate across each data-point  -->
                                        <ControlTemplate>
                                            <s:EllipsePointMarker Width="7"
                                                                  Height="7"
                                                                  Fill="#FF00DC"
                                                                  Stroke="White" />
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>

                        </s:SeriesSelectionModifier.SelectedSeriesStyle>
                    </s:SeriesSelectionModifier>

                    <!--  Provides a data source for the legend control  -->
                    <s:LegendModifier Margin="10"
                                      GetLegendDataFor="SelectedSeries"
                                      ShowLegend="True" />

                </s:ModifierGroup>
            </s:SciChartSurface.ChartModifier>

        </s:SciChartSurface>

    </Grid>
</UserControl>

// SeriesSelectionExampleView.xaml.cs

// *************************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2021. All rights reserved.
//  
// Web: http://www.scichart.com
//   Support: support@scichart.com
//   Sales:   sales@scichart.com
// 
// SeriesSelectionExampleView.xaml.cs is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use. 
// 
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied. 
// *************************************************************************************

using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using SciChart.Charting.Model.DataSeries;
using SciChart.Charting.Visuals.Axes;
using SciChart.Charting.Visuals.RenderableSeries;
using SciChart.Examples.ExternalDependencies.Data;

namespace SciChart.Examples.Examples.InspectDatapoints
{
    public partial class SeriesSelectionExampleView : UserControl
    {
        private const int SeriesPointCount = 150;
        private const int SeriesCount = 80;

        public SeriesSelectionExampleView()
        {
            InitializeComponent();
        }

        public void SeriesSelectionExampleView_OnLoaded(object sender, RoutedEventArgs e)
        {
            // Create a number of DataSeries of type X=double, Y=double
            var allDataSeries = new IUniformXyDataSeries<double>[SeriesCount];

            var initialColor = Colors.Blue;

            // Suspend visual updates while we add N RenderableSeries
            using (sciChartSurface.SuspendUpdates())
            {
                // Add N data and renderable series
                for (int i = 0; i < SeriesCount; i++)
                {
                    AxisAlignment alignment = i % 2 == 0 ? AxisAlignment.Left : AxisAlignment.Right;

                    allDataSeries[i] = GenerateDataSeries(alignment, i);

                    var renderableSeries = new FastLineRenderableSeries {Stroke = initialColor};

                    renderableSeries.YAxisId = alignment.ToString();

                    // Assign DataSeries to RenderableSeries
                    renderableSeries.DataSeries = allDataSeries[i];

                    // Assign RenderableSeries to SciChartSurface
                    sciChartSurface.RenderableSeries.Add(renderableSeries);

                    // Colors are incremented for visual purposes only
                    int newR = initialColor.R == 255 ? 255 : initialColor.R + 5;
                    int newB = initialColor.B == 0 ? 0 : initialColor.B - 2;

                    initialColor = Color.FromArgb(255, (byte) newR, initialColor.G, (byte) newB);
                }
            }

            sciChartSurface.RenderableSeries[SeriesCount / 2].IsSelected = true;

            sciChartSurface.ZoomExtents();
        }

        private IUniformXyDataSeries<double> GenerateDataSeries(AxisAlignment axisAlignment, int index)
        {
            var dataSeries = new UniformXyDataSeries<double>
            {
                SeriesName = string.Format("Series {0}", index)
            };

            double gradient = axisAlignment == AxisAlignment.Right ? index : -index;
            double start = axisAlignment == AxisAlignment.Right ? 0.0 : 14000;

            dataSeries.Append(DataManager.Instance.GetStraightLineYData(gradient, start, SeriesPointCount));

            return dataSeries;
        }
    }
}

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