Demonstrates how to undo/redo Zoom and Pan (Zoom History) by using the ZoomHistoryManager type.

The ZoomHistoryManager is attached to the chart via the SciChartSurface.ZoomHistoryManager property.

All zoom, pan operations then become tracked, and you can Undo or Redo zoom via the ZoomHistoryManager.Undo and ZoomHistoryManager.Redo methods.

In MVVM Applications, you can also bind to and execute the ZoomHistoryManager.UndoCommand and ZoomHistoryManager.RedoCommand.

// SimpleUndoRedoView.xaml

<UserControl x:Class="SciChart.Examples.Examples.ZoomHistory.SimpleUndoRedoView"
             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"
             Loaded="LineChartExampleView_OnLoaded"
             d:DesignHeight="400"
             d:DesignWidth="600"
             mc:Ignorable="d">

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

        <!--  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 ElementName=SciChart}">

            <Button Command="{Binding ElementName=SciChart,
                                      Path=ZoomHistoryManager.UndoCommand}"
                    Content="UN"
                    FontSize="11"
                    Padding="0"
                    Style="{StaticResource DefaultButtonStyle}"
                    ToolTipService.ToolTip="UNDO Zoom" />

            <Button Command="{Binding ElementName=SciChart,
                                      Path=ZoomHistoryManager.RedoCommand}"
                    Content="RE"
                    FontSize="11"
                    Padding="0"
                    Style="{StaticResource DefaultButtonStyle}"
                    ToolTipService.ToolTip="REDO Zoom" />
            
        </ext:SciChartInteractionToolbar>

        <!--  Create the chart surface  -->
        <s:SciChartSurface Name="SciChart"
                           Grid.Column="1"
                           BorderThickness="0"
                           Padding="0">

            <!--  Declare RenderableSeries  -->
            <s:SciChartSurface.RenderableSeries>
                <s:FastLineRenderableSeries x:Name="LineRenderSeries"
                                            Stroke="#FF99EE99"
                                            StrokeThickness="2"
                                            XAxisId="XId"
                                            YAxisId="YId" />
            </s:SciChartSurface.RenderableSeries>

            <!--  Create an X Axis with Growby  -->
            <s:SciChartSurface.XAxis>
                <s:NumericAxis DrawMajorBands="True"
                               FlipCoordinates="True"
                               GrowBy="0.1, 0.1"
                               Id="XId"
                               ScientificNotation="None"
                               TextFormatting="#.############" />
            </s:SciChartSurface.XAxis>

            <!--  Create a Y Axis with Growby. Optional bands give a cool look and feel for minimal performance impact  -->
            <s:SciChartSurface.YAxis>
                <s:NumericAxis DrawMajorBands="True" Id="YId" />
            </s:SciChartSurface.YAxis>

            <s:SciChartSurface.ChartModifier>
                <s:ModifierGroup>
                    <s:MouseWheelZoomModifier/>
                    <s:XAxisDragModifier/>
                    <s:YAxisDragModifier/>
                </s:ModifierGroup>
            </s:SciChartSurface.ChartModifier>
            
        </s:SciChartSurface>

    </Grid>
</UserControl>

// SimpleUndoRedoView.xaml.cs

// *************************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2020. All rights reserved.
//  
// Web: http://www.scichart.com
//   Support: support@scichart.com
//   Sales:   sales@scichart.com
// 
// SimpleUndoRedoView.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;
using SciChart.Charting.HistoryManagers;
using SciChart.Charting.Model.DataSeries;
using SciChart.Examples.ExternalDependencies.Data;

namespace SciChart.Examples.Examples.ZoomHistory
{
    public partial class SimpleUndoRedoView : UserControl
    {
        public SimpleUndoRedoView()
        {
            InitializeComponent();
        }

        private void LineChartExampleView_OnLoaded(object sender, RoutedEventArgs e)
        {
            SciChart.ZoomHistoryManager = new ZoomHistoryManager();

            // Create a DataSeries of type X=double, Y=double
            var dataSeries = new XyDataSeries<double, double>();

            LineRenderSeries.DataSeries = dataSeries;

            var data = DataManager.Instance.GetFourierSeries(1.0, 0.1);

            // Append data to series. SciChart automatically redraws
            dataSeries.Append(data.XData, data.YData);

            SciChart.ZoomExtents();
        }
    }
}

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