Demonstrates how to implement custom overview using the – SciChartScrollBar control.

Tip!

Using the technique showed in example you could display literally anything behind a scrollbar. You could display an image, or bind to series provided by an external source etc…

Documentation Links

– Creating a Custom SciChartOverview with many series using the ScrollBar API
– SciChartScrollbar – per axis ScrollBars API
– SciChartOverview Type

// CustomOverviewView.xaml

<UserControl x:Class="SciChart.Examples.Examples.ZoomAndPanAChart.CustomOverview.CustomOverviewView"
             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:ext="http://schemas.abtsoftware.co.uk/scichart/exampleExternals"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:s="http://schemas.abtsoftware.co.uk/scichart"
             d:DesignHeight="400"
             d:DesignWidth="600"
             mc:Ignorable="d">

    <UserControl.Resources>
        <Style TargetType="s:SciChartScrollbar">
            <Setter Property="GripsThickness" Value="9" />
            <Setter Property="GripsLength" Value="30" />
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="ViewportStyle">
                <Setter.Value>
                    <Style TargetType="Control">
                        <Setter Property="Background" Value="#33000000" />
                        <Setter Property="BorderBrush" Value="#99000000" />
                    </Style>
                </Setter.Value>
            </Setter>
            <Setter Property="GripsStyle">
                <Setter.Value>
                    <Style TargetType="Control">
                        <Setter Property="Background" Value="#535353" />
                        <Setter Property="BorderThickness" Value="2" />
                    </Style>
                </Setter.Value>
            </Setter>
        </Style>

        <ext:DoubleToGridLengthConverter x:Key="DoubleToGridLengthConverter" />
    </UserControl.Resources>

    <Grid Background="{Binding Source={x:Reference Name=MainChartSurface}, Path=Background}">

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <!--  The SciChartInteractionToolbar adds zoom, pan, zoom extents and rotate functionality  -->
        <!--  to the chart and is included for example purposes.  -->
        <!--  If you wish to know how to zoom and pan a chart then do a search for Zoom Pan in the Examples suite!  -->
        <ext:SciChartInteractionToolbar TargetSurface="{Binding Source={x:Reference Name=MainChartSurface}}" Grid.RowSpan="2" />

        <s:SciChartSurface x:Name="MainChartSurface"
                           Grid.Column="1"
                           RenderableSeries="{s:SeriesBinding RenderableSeriesViewModels}">

            <s:SciChartSurface.XAxis>
                <s:NumericAxis x:Name="XAxis"
                               DrawMinorGridLines="True"
                               DrawMinorTicks="True"
                               VisibleRange="50,300" />
            </s:SciChartSurface.XAxis>

            <s:SciChartSurface.YAxis>
                <s:NumericAxis DrawMinorGridLines="True" DrawMinorTicks="True" />
            </s:SciChartSurface.YAxis>

        </s:SciChartSurface>

        <!--  This grid is used to space Overview Control so its width matches parent chart XAxis  -->
        <Grid Grid.Row="1" Grid.Column="1">
            <!--  The grid is used to set paddings around the Overview, so that the size of the Overview matches the size of the XAxis on the parent chart  -->
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <!--  Hosts overview control  -->
                <ColumnDefinition Width="{Binding Source={x:Reference Name=proxy}, Path=ActualWidthValue, Mode=OneWay, Converter={StaticResource DoubleToGridLengthConverter}}" />
                <!--  Used to bind to parent surface YAxis  -->
            </Grid.ColumnDefinitions>

            <!--  This class is in the Examples Source Code, under your install directory  -->
            <ext:ActualSizePropertyProxy x:Name="proxy" Element="{Binding Source={x:Reference Name=MainChartSurface}, Path=YAxis}" />

            <!--  Define the SciChartSurface behind the scrollbar  -->
            <s:SciChartSurface x:Name="OverviewSurface"
                               Grid.Column="0"
                               Loaded="OnOverviewSurfaceLoaded"
                               RenderableSeries="{s:SeriesBinding RenderableSeriesViewModels}">

                <s:SciChartSurface.XAxis>
                    <s:NumericAxis DrawMajorGridLines="False"
                                   DrawMinorGridLines="False"
                                   Visibility="Collapsed" />
                </s:SciChartSurface.XAxis>

                <s:SciChartSurface.YAxis>

                    <s:NumericAxis DrawMajorGridLines="False"
                                   DrawMinorGridLines="False"
                                   Visibility="Collapsed" />
                </s:SciChartSurface.YAxis>

            </s:SciChartSurface>

            <!--  Define the scrollbar and bind to MainChartSurface XAxis  -->
            <s:SciChartScrollbar Grid.Column="0"
                                 Height="100"
                                 Margin="{Binding Source={x:Reference Name=MainChartSurface}, Path=Padding, Mode=OneWay}"
                                 Axis="{Binding Source={x:Reference Name=XAxis}}" />

        </Grid>
    </Grid>
</UserControl>

// CustomOverviewView.xaml.cs

// *************************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2020. All rights reserved.
//  
// Web: http://www.scichart.com
//   Support: support@scichart.com
//   Sales:   sales@scichart.com
// 
// CustomOverviewView.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.Windows;
using System.Windows.Controls;

namespace SciChart.Examples.Examples.ZoomAndPanAChart.CustomOverview
{
    /// <summary>
    /// Interaction logic for CustomOverview.xaml
    /// </summary>
    public partial class CustomOverviewView : UserControl
    {
        public CustomOverviewView()
        {
            InitializeComponent();
        }

        private void OnOverviewSurfaceLoaded(object sender, RoutedEventArgs e)
        {
            OverviewSurface.ZoomExtents();
        }
    }
}

// CustomOverviewViewModel.cs

// *************************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2020. All rights reserved.
//  
// Web: http://www.scichart.com
//   Support: support@scichart.com
//   Sales:   sales@scichart.com
// 
// CustomOverviewViewModel.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;
using System.Collections.ObjectModel;
using System.Windows.Media;
using SciChart.Charting.Model.ChartSeries;
using SciChart.Charting.Model.DataSeries;
using SciChart.Examples.ExternalDependencies.Common;
using SciChart.Examples.ExternalDependencies.Data;

namespace SciChart.Examples.Examples.ZoomAndPanAChart.CustomOverview
{
    public class CustomOverviewViewModel: BaseViewModel
    {
        private const int SeriesCount = 25;
        private const int PointCount = 500;

        public CustomOverviewViewModel()
        {
            Initialize();
        }

        private void Initialize()
        {
            RenderableSeriesViewModels = new ObservableCollection<IRenderableSeriesViewModel>();
            var random = new Random(0);
            var generator = new RandomWalkGenerator();

            for (int i = 0; i < SeriesCount; i++)
            {
                var dataSeries = new XyDataSeries<double, double>();
                var someData = generator.GetRandomWalkSeries(PointCount);
                generator.Reset();
                dataSeries.Append(someData.XData, someData.YData);

                var rgb = new byte[3];
                random.NextBytes(rgb);

                RenderableSeriesViewModels.Add(new LineRenderableSeriesViewModel
                {
                    DataSeries = dataSeries,
                    AntiAliasing = false,
                    Stroke = Color.FromArgb(255, rgb[0], rgb[1], rgb[2]),
                });
            }
        }

        public ObservableCollection<IRenderableSeriesViewModel> RenderableSeriesViewModels { get; set; }
    }
}

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