This example demonstrates a Waterfall chart simulation using SciChart 2D charts.

A custom WaterfallRubberBandZoomModifier is implemented using SciChart custom modifiers API. See the following articles for more details:

• Custom ChartModifier
• Zooming, Panning

// WaterfallChart.xaml

<UserControl x:Class="SciChart.Examples.Examples.SeeFeaturedApplication.WaterfallChart.WaterfallChart"
             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"
             xmlns:waterfallChart="clr-namespace:SciChart.Examples.Examples.SeeFeaturedApplication.WaterfallChart"
             d:DesignHeight="400"
             d:DesignWidth="600"
             mc:Ignorable="d">

    <UserControl.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/SciChart.Examples.ExternalDependencies;component/Resources/Styles/ToolbarButtonsCommon.xaml" />
            </ResourceDictionary.MergedDictionaries>

            <DataTemplate x:Key="CustomZoomButtonStyle">
                <Viewbox>
                    <Grid Width="26" Height="26">
                        <Path Data="M 21,13 26,10 26,16 z M 5,13 0,10 0,16 z M 7,0 7,26 M 19,0 19,26 M 9,5 17,1 M 9,8 17,4 M 9,11 17,7 M 9,14 17,10 M 9,17 17,13 M 9,20 17,16 M 9,23 17,19 M 9,26 17,22" Style="{StaticResource ButtonPathStyle}" />
                    </Grid>
                </Viewbox>
            </DataTemplate>

            <ext:BoolToValueConverter x:Key="BoolToSwitchValueConverter"
                                      FalseValue="True"
                                      TrueValue="False" />

        </ResourceDictionary>
    </UserControl.Resources>

    <Grid Background="#FF1C1C1E">

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

        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="300" />
        </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 Grid.RowSpan="2" TargetSurface="{Binding Source={x:Reference Name=sciChart}}">

            <ToggleButton x:Name="customRubberBandButton"
                          HorizontalAlignment="Left"
                          Content="Zoom"
                          ContentTemplate="{StaticResource CustomZoomButtonStyle}"
                          IsChecked="{Binding Source={x:Reference Name=customRubberBandModifier}, Path=IsEnabled, Mode=TwoWay}"
                          Style="{StaticResource DefaultToggleButtonStyle}"
                          ToolTipService.ToolTip="Custom Toggle Rubber-Band Zoom"
                          s:ToggleButtonExtensions.GroupName="ZoomPanSelectionGroup" />

        </ext:SciChartInteractionToolbar>

        <s:SciChartSurface x:Name="sciChart"
                           Grid.Column="1"
                           Grid.ColumnSpan="2"
                           Margin="0 0 0 28"
                           Loaded="SciChart_OnLoaded">

            <s:SciChartSurface.ChartModifier>
                <s:ModifierGroup>
                    
                    <s:RubberBandXyZoomModifier ext:SciChartInteractionToolbar.AppearceInToolbar="False" />
                    <s:AnnotationCreationModifier ext:SciChartInteractionToolbar.AppearceInToolbar="False" />
                    <s:YAxisDragModifier IsEnabled="False" />
                    <s:XAxisDragModifier IsEnabled="False" />
                    <s:ZoomExtentsModifier IsAnimated="True"/>
                    <s:ZoomPanModifier x:Name="PanModifier"
                                       IsEnabled="False"
                                       XyDirection="XDirection"
                                       ZoomExtentsY="False"/>
                    <s:SeriesSelectionModifier IsEnabled="False" SelectionChanged="SeriesSelectionModifier_OnSelectionChanged" />
                    <waterfallChart:CustomWaterfallRubberBandXyZoomModifier x:Name="customRubberBandModifier"
                                                                            IsAnimated="True"
                                                                            IsXAxisOnly="True"/>
                </s:ModifierGroup>
            </s:SciChartSurface.ChartModifier>
            <s:SciChartSurface.Annotations>

                <s:AxisMarkerAnnotation x:Name="AxisMarkerAnnotation"
                                        AnnotationCanvas="XAxis"
                                        Background="Green"
                                        FormattedValue="{Binding RelativeSource={RelativeSource Self},
                                                                 Path=AxisInfo.CursorFormattedDataValue}"
                                        IsEditable="True"
                                        MarkerPointWidth="4"
                                        PropertyChanged="AxisMarkerAnnotation_OnPropertyChanged"
                                        VerticalAnchorPoint="Bottom"
                                        X1="250"
                                        XAxisId="AxisX0"
                                        Y1="0"
                                        YAxisId="AxisY0" />

            </s:SciChartSurface.Annotations>

        </s:SciChartSurface>

        <s:SciChartSurface x:Name="sciChart2"
                           Grid.Row="1"
                           Grid.Column="1"
                           Margin="5">

            <s:SciChartSurface.RenderableSeries>
                <s:FastLineRenderableSeries x:Name="LineRenderableSeries" Stroke="Aqua" />
            </s:SciChartSurface.RenderableSeries>

            <s:SciChartSurface.XAxis>
                <s:NumericAxis x:Name="sciChart2NumericXAxis" VisibleRangeChanged="OnVisibleRangeChanged"/>
            </s:SciChartSurface.XAxis>

            <s:SciChartSurface.YAxis>
                <s:NumericAxis GrowBy="0.1,0.1" />
            </s:SciChartSurface.YAxis>

            <s:SciChartSurface.ChartModifier>
                <s:ModifierGroup>
                    <s:ZoomExtentsModifier IsAnimated="True"/>
                    <s:ZoomPanModifier IsEnabled="{Binding Source={x:Reference Name=PanModifier}, Path=IsEnabled,
                                                           Mode=OneWay,
                                                           UpdateSourceTrigger=PropertyChanged}"
                                       XyDirection="XDirection"
                                       ZoomExtentsY="False"/>
                    <s:RubberBandXyZoomModifier IsAnimated="True"
                                                IsEnabled="{Binding Source={x:Reference Name=customRubberBandModifier}, Path=IsEnabled,
                                                                    Mode=OneWay,
                                                                    UpdateSourceTrigger=PropertyChanged}"
                                                IsXAxisOnly="True"/>
                </s:ModifierGroup>
            </s:SciChartSurface.ChartModifier>

        </s:SciChartSurface>

        <s:SciChartSurface x:Name="sciChart3"
                           Grid.Row="1"
                           Grid.Column="2"
                           Margin="5">

            <s:SciChartSurface.RenderableSeries>
                <s:FastLineRenderableSeries x:Name="LineRenderableSeries2" Stroke="Goldenrod" />
            </s:SciChartSurface.RenderableSeries>

            <s:SciChartSurface.XAxis>
                <s:NumericAxis GrowBy="0.1,0.1" />
            </s:SciChartSurface.XAxis>

            <s:SciChartSurface.YAxis>
                <s:NumericAxis GrowBy="0.1,0.1" />
            </s:SciChartSurface.YAxis>

        </s:SciChartSurface>


    </Grid>
</UserControl>

// WaterfallChart.xaml.cs

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Management.Instrumentation;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using SciChart.Charting.ChartModifiers;
using SciChart.Charting.Common.Extensions;
using SciChart.Charting.Model.DataSeries;
using SciChart.Charting.Visuals.Axes;
using SciChart.Charting.Visuals.Events;
using SciChart.Charting.Visuals.PaletteProviders;
using SciChart.Charting.Visuals.PointMarkers;
using SciChart.Charting.Visuals.RenderableSeries;
using SciChart.Core.Extensions;
using SciChart.Core.Helpers;
using SciChart.Data.Model;
using SciChart.Examples.ExternalDependencies.Data;
using SciChart.Examples.ExternalDependencies.Helpers;

namespace SciChart.Examples.Examples.SeeFeaturedApplication.WaterfallChart
{
    /// <summary>
    ///     Interaction logic for WaterfallChart.xaml
    /// </summary>
    public partial class WaterfallChart : UserControl
    {
        // A drop in replacement for System.Random which is 3x faster: https://www.codeproject.com/Articles/9187/A-fast-equivalent-for-System-Random
        private readonly Random _random = new Random();
        private readonly FFT2 _transform;
        private VerticalValuesPaletteProvider _paletteProvider;
        private XyDataSeries<double, double> _emptySeries;
        

        public WaterfallChart()
        {
            InitializeComponent();
            _transform = new FFT2();
            _transform.init(10);
            _paletteProvider = new VerticalValuesPaletteProvider();
        }

        private void SciChart_OnLoaded(object sender, RoutedEventArgs e)
        {
            var count = 50;
            var renderableSeries = new ObservableCollection<IRenderableSeries>();
            sciChart.YAxes.Clear();
            sciChart.XAxes.Clear();

            for (var i = 0; i < count; i++)
            {
                var yAxis = new CustomWaterfallNumericAxis();
                yAxis.offset = 3.0 * -i;
                yAxis.min = -60.0;
                yAxis.max = 60;
                yAxis.Id = "AxisY" + i;
                yAxis.AutoRange = AutoRange.Once;
                yAxis.DrawMinorTicks = false;
                yAxis.DrawMinorGridLines = false;
                yAxis.DrawMajorGridLines = false;
                yAxis.DrawMajorBands = false;
                yAxis.DrawMajorTicks = false;
                yAxis.AxisAlignment = AxisAlignment.Left;
                yAxis.BorderBrush = Brushes.Black;
                yAxis.BorderThickness = new Thickness(0, 0, 1, 0);
                yAxis.Margin = new Thickness(0, sciChart.ActualHeight * 0.6, 0, 0);

                var xAxis = new CustomWaterfallNumericAxis();
                xAxis.offset = 2.0 * i;
                xAxis.max = 10.0;
                xAxis.Id = "AxisX" + i;
                xAxis.DrawMinorTicks = false;
                xAxis.DrawMinorGridLines = false;
                xAxis.DrawMajorGridLines = false;
                xAxis.DrawMajorBands = false;
                xAxis.DrawMajorTicks = false;
                xAxis.BorderThickness = new Thickness(0, 1, 0, 0);
                xAxis.BorderBrush = Brushes.Black;
                xAxis.Margin = new Thickness(0, 0, sciChart.ActualWidth * 0.1, 0);

                var series = new FastLineRenderableSeries();
                series.YAxisId = yAxis.Id;
                series.PaletteProvider = _paletteProvider;
                series.XAxisId = xAxis.Id;
                series.DataSeries = UpdateXyDataSeries();
                series.Stroke = Colors.DarkGreen;
                if (i != 0)
                {
                    xAxis.Visibility = Visibility.Hidden;
                    xAxis.Height = 0.0;

                    yAxis.Visibility = Visibility.Hidden;
                    yAxis.Width = 0.0;
                }
                sciChart.YAxes.Add(yAxis);
                sciChart.XAxes.Add(xAxis);

                renderableSeries.Add(series);
            }

            sciChart.RenderableSeries = renderableSeries;
            sciChart.RenderableSeries[25].IsSelected = true;
            sciChart.XAxes[0].VisibleRangeChanged += OnVisibleRangeChanged;

            OnSeriesSelect();
            OnAxisMarkerAnnotationMove();
        }
        private void OnSeriesSelect()
        {
            var selectedSeries = sciChart.SelectedRenderableSeries.FirstOrDefault();
            if (selectedSeries != null)
            {
                LineRenderableSeries.DataSeries = selectedSeries.DataSeries;
            }
            else
            {
                LineRenderableSeries.DataSeries = _emptySeries;
            }
        }

        private void OnAxisMarkerAnnotationMove()
        {
            var doubleSeries = new XyDataSeries<double, double>();
            var axisInfo = AxisMarkerAnnotation.AxisInfo;
            var dataIndex = 0;

            if (axisInfo != null)
            {
                var position = (double)axisInfo.DataValue;
                dataIndex = sciChart.RenderableSeries[0].DataSeries.XValues.FindIndex(true, position, SearchMode.Nearest);
            }
            else dataIndex = Convert.ToInt32(AxisMarkerAnnotation.X1);

            if (_paletteProvider != null)
            {
                _paletteProvider.SelectedIndex = dataIndex;
            }

            for (var i = 0; i < sciChart.RenderableSeries.Count; i++)
            {
                doubleSeries.Append(i, (double)sciChart.RenderableSeries[i].DataSeries.YValues[dataIndex]);
                _paletteProvider.OnBeginSeriesDraw(sciChart.RenderableSeries[i]);
            }

            if (sciChart3 != null && sciChart3.RenderableSeries.Any())
            {
                sciChart3.RenderableSeries[0].DataSeries = doubleSeries;
                sciChart3.ZoomExtents();
            }
        }

        private XyDataSeries<double, double> UpdateXyDataSeries()
        {
            var doubleSeries = new XyDataSeries<double, double>();

            var _re = new double[1024];
            var _im = new double[1024];

            for (var i = 0; i < 1024; i++)
            {
                _re[i] = 2.0 * Math.Sin(2 * Math.PI * i / 20) +
                         5 * Math.Sin(2 * Math.PI * i / 10) +
                         2.0 * _random.NextDouble();
                _im[i] = -10;
            }

            _transform.run(_re, _im);
            var _re2 = new double[500];
            var _im2 = new double[500];
            for (var i = 0; i < 500; i++)
            {
                var mag = Math.Sqrt(_re[i] * _re[i] + _im[i] * _im[i]);
                var yVal = 20 * Math.Log10(mag / 500);
                _re2[i] = (yVal < -25 || yVal > -5)
                    ? (yVal < -25) ? -25 : _random.Next(-6, -3)
                    : yVal;

                _im2[i] = i;
            }
            _re2[0] = -25;
            doubleSeries.Append(_im2, _re2);

            return doubleSeries;
        }

        private void SeriesSelectionModifier_OnSelectionChanged(object sender, EventArgs e)
        {
            OnSeriesSelect();
        }

        private void AxisMarkerAnnotation_OnPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            using (sciChart.SuspendUpdates())
            {
                customRubberBandButton.IsChecked = false;
                OnAxisMarkerAnnotationMove();
            }
        }

        private void OnVisibleRangeChanged(object sender, VisibleRangeChangedEventArgs e)
        {
            if (sender.Equals(sciChart2NumericXAxis))
            {
                sciChart.XAxes.ForEachDo(x => x.VisibleRange = e.NewVisibleRange);
            }
            else sciChart2NumericXAxis.VisibleRange = e.NewVisibleRange;
        }

    }
}

// CustomWaterfallNumericAxis.cs

using System;
using SciChart.Charting.Visuals.Axes;
using SciChart.Data.Model;

namespace SciChart.Examples.Examples.SeeFeaturedApplication.WaterfallChart
{
    public class CustomWaterfallNumericAxis : NumericAxis
    {
        public double offset { get; set; }
        public double min { get; set; }
        public double max { get; set; }

        public CustomWaterfallNumericAxis()
        {
            min = 0.0;
            max = 0.0;
        }

        public override double GetAxisOffset()
        {
            return base.GetAxisOffset() + offset;
        }

        protected override IRange CalculateDataRange()
        {
            return IsXAxis ? new DoubleRange(0.0, 15.0) : new DoubleRange(-50.0, 50.0);
        }

        public override IRange GetMaximumRange()
        {
            return (min.Equals(max)) ? new DoubleRange(min, max) : base.GetMaximumRange();
        }
    }
}

// CustomWaterfallRubberBandXyZoomModifier.cs

using System;
using System.Windows;
using SciChart.Charting.ChartModifiers;
using SciChart.Core.Utility.Mouse;

namespace SciChart.Examples.Examples.SeeFeaturedApplication.WaterfallChart
{
    public class CustomWaterfallRubberBandXyZoomModifier : RubberBandXyZoomModifier
    {
        public Point startPoint { get; set; }
        public Point endPoint { get; set; }

        public override void OnModifierMouseDown(ModifierMouseArgs e)
        {
            base.OnModifierMouseDown(e);
            startPoint = GetPointRelativeTo(e.MousePoint, ModifierSurface);
        }

        public override void OnModifierMouseUp(ModifierMouseArgs e)
        {
            ModifierSurface.ReleaseMouseCapture();
            endPoint = GetPointRelativeTo(e.MousePoint, ModifierSurface);
            OnAttached();

            if (Math.Abs(startPoint.X - endPoint.X) > 10)
            {
                int i = 0;
                foreach (CustomWaterfallNumericAxis YAxis in ParentSurface.XAxes)
                {

                    YAxis.Zoom(startPoint.X + i * 2, endPoint.X + i * 2, TimeSpan.FromMilliseconds(1000));
                    i++;
                }
            }
        }
    }

}

// FFT.cs

// *************************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2016. All rights reserved.
//  
// Web: http://www.scichart.com
//   Support: support@scichart.com
//   Sales:   sales@scichart.com
// 
// FFT.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;

// Reference: http://gerrybeauregard.wordpress.com/2011/04/01/an-fft-in-c/
namespace SciChart.Examples.ExternalDependencies.Data
{
    
    /**
    * Performs an in-place complex FFT.
    *
    * Released under the MIT License
    *
    * Copyright (c) 2010 Gerald T. Beauregard
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy
    * of this software and associated documentation files (the "Software"), to
    * deal in the Software without restriction, including without limitation the
    * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
    * sell copies of the Software, and to permit persons to whom the Software is
    * furnished to do so, subject to the following conditions:
    *
    * The above copyright notice and this permission notice shall be included in
    * all copies or substantial portions of the Software.
    *
    * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
    * IN THE SOFTWARE.
    */
    public class FFT2
    {
        // Element for linked list in which we store the
        // input/output data. We use a linked list because
        // for sequential access it's faster than array index.
        class FFTElement
        {
            public double re = 0.0;		// Real component
            public double im = 0.0;		// Imaginary component
            public FFTElement next;		// Next element in linked list
            public uint revTgt;			// Target position post bit-reversal
        }

        private uint m_logN = 0;		// log2 of FFT size
        private uint m_N = 0;			// FFT size
        private FFTElement[] m_X;		// Vector of linked list elements

        /**
         *
         */
        public FFT2()
        {
        }

        /**
         * Initialize class to perform FFT of specified size.
         *
         * @param	logN	Log2 of FFT length. e.g. for 512 pt FFT, logN = 9.
         */
        public void init(
            uint logN)
        {
            m_logN = logN;
            m_N = (uint)(1 << (int)m_logN);

            // Allocate elements for linked list of complex numbers.
            m_X = new FFTElement[m_N];
            for (uint k = 0; k < m_N; k++)
                m_X[k] = new FFTElement();

            // Set up "next" pointers.
            for (uint k = 0; k < m_N - 1; k++)
                m_X[k].next = m_X[k + 1];

            // Specify target for bit reversal re-ordering.
            for (uint k = 0; k < m_N; k++)
                m_X[k].revTgt = BitReverse(k, logN);
        }

        /**
         * Performs in-place complex FFT.
         *
         * @param	xRe		Real part of input/output
         * @param	xIm		Imaginary part of input/output
         * @param	inverse	If true, do an inverse FFT
         */
        public void run(
            double[] xRe,
            double[] xIm,
            bool inverse = false)
        {
            uint numFlies = m_N >> 1;	// Number of butterflies per sub-FFT
            uint span = m_N >> 1;		// Width of the butterfly
            uint spacing = m_N;			// Distance between start of sub-FFTs
            uint wIndexStep = 3; 		// Increment for twiddle table index

            // Copy data into linked complex number objects
            // If it's an IFFT, we divide by N while we're at it
            FFTElement x = m_X[0];
            uint k = 0;
            double scale = inverse ? 1.0 / m_N : 1.0;
            while (x != null)
            {
                x.re = scale * xRe[k];
                x.im = scale * xIm[k];
                x = x.next;
                k++;
            }

            // For each stage of the FFT
            for (uint stage = 0; stage < m_logN; stage++)
            {
                // Compute a multiplier factor for the "twiddle factors".
                // The twiddle factors are complex unit vectors spaced at
                // regular angular intervals. The angle by which the twiddle
                // factor advances depends on the FFT stage. In many FFT
                // implementations the twiddle factors are cached, but because
                // array lookup is relatively slow in C#, it's just
                // as fast to compute them on the fly.
                double wAngleInc = wIndexStep * 2.0 * Math.PI / m_N;
                if (inverse == false)
                    wAngleInc *= -1;
                double wMulRe = Math.Cos(wAngleInc);
                double wMulIm = Math.Sin(wAngleInc);

                for (uint start = 0; start < m_N; start += spacing)
                {
                    FFTElement xTop = m_X[start];
                    FFTElement xBot = m_X[start + span];

                    double wRe = 1.0;
                    double wIm = 0.0;

                    // For each butterfly in this stage
                    for (uint flyCount = 0; flyCount < numFlies; ++flyCount)
                    {
                        // Get the top & bottom values
                        double xTopRe = xTop.re;
                        double xTopIm = xTop.im;
                        double xBotRe = xBot.re;
                        double xBotIm = xBot.im;

                        // Top branch of butterfly has addition
                        xTop.re = xTopRe + xBotRe;
                        xTop.im = xTopIm + xBotIm;

                        // Bottom branch of butterly has subtraction,
                        // followed by multiplication by twiddle factor
                        xBotRe = xTopRe - xBotRe;
                        xBotIm = xTopIm - xBotIm;
                        xBot.re = xBotRe * wRe - xBotIm * wIm;
                        xBot.im = xBotRe * wIm + xBotIm * wRe;

                        // Advance butterfly to next top & bottom positions
                        xTop = xTop.next;
                        xBot = xBot.next;

                        // Update the twiddle factor, via complex multiply
                        // by unit vector with the appropriate angle
                        // (wRe + j wIm) = (wRe + j wIm) x (wMulRe + j wMulIm)
                        double tRe = wRe;
                        wRe = wRe * wMulRe - wIm * wMulIm;
                        wIm = tRe * wMulIm + wIm * wMulRe;
                    }
                }

                numFlies >>= 1; 	// Divide by 2 by right shift
                span >>= 1;
                spacing >>= 1;
                wIndexStep <<= 1;  	// Multiply by 2 by left shift
            }

            // The algorithm leaves the result in a scrambled order.
            // Unscramble while copying values from the complex
            // linked list elements back to the input/output vectors.
            x = m_X[0];
            while (x != null)
            {
                uint target = x.revTgt;
                xRe[target] = x.re;
                xIm[target] = x.im;
                x = x.next;
            }
        }

        /**
         * Do bit reversal of specified number of places of an int
         * For example, 1101 bit-reversed is 1011
         *
         * @param	x		Number to be bit-reverse.
         * @param	numBits	Number of bits in the number.
         */
        private uint BitReverse(
            uint x,
            uint numBits)
        {
            uint y = 0;
            for (uint i = 0; i < numBits; i++)
            {
                y <<= 1;
                y |= x & 0x0001;
                x >>= 1;
            }
            return y;
        }
    }
}

// VerticalValuesPaletteProvider.cs

using SciChart.Charting.Visuals.PaletteProviders;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Media;
using SciChart.Charting.Model.DataSeries;
using SciChart.Charting.Visuals.RenderableSeries;

namespace SciChart.Examples.Examples.SeeFeaturedApplication.WaterfallChart
{
    public class VerticalValuesPaletteProvider : DependencyObject, IStrokePaletteProvider
    {
        public int SelectedIndex { get; set; }

        public Color? OverrideStrokeColor(IRenderableSeries rSeries, int index, IPointMetadata metadata)
        {
            if (rSeries.IsSelected)
            {
                return Colors.Aqua;
            }

            if (index == SelectedIndex)
            {
                return Colors.Goldenrod;
            }

            return null;
        }

        public void OnBeginSeriesDraw(IRenderableSeries rSeries)
        {
        }
    }
}

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