ComponentOne FinancialChart for WPF
Analytics / Overlays / Bollinger Bands
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    Bollinger Bands
    In This Topic

    Bollinger Bands overlay displays upper and lower limits of the price movements over the time. These are volatility bands based on standard deviation, and are placed above and below a moving average. Bollinger Bands are helpful in providing a relative definition of high and low price. Prices plotted near the upper band are considered high, while prices near the lower band are low. The width of the band depicts the measure of volatility. The price values touching the top of the Bollinger Band are supposed to be over extended above the intermediate trend, and the prices touching the bottom of the Bollinger band are supposed to be over extended below the intermediate trend.

    To use Bollinger Bands overlay in FinancialChart, add a FinancialChart control to your application and bind it to an appropriate data source or populate data in it through Quote Collection. ItemsSource object enables data binding or populating data in FinancialChart. BollingerBands class exposes Multiplier property, to specify standard deviations for upper and lower bands, and IndicatorBase class provides the Period property, which takes integer value for calculating Simple Moving Average for the middle band. Based on the values of these properties, data points for Bollinger Bands overlay are calculated and plotted on FinancialChart.

    FinancialChart also enables you to fetch the calculated Lower y valuesMiddle y valuesUpper y values, and x values at run-time. This can help in creating alerts in application or maintaining logs while working with dynamic data. 

    Bollinger-Bands-Overlay

    The following example considers stock data for a company Box Inc. over a period of time and plots Bollinger Bands overlay on the same financial chart, as shown in the image above. The example uses data from a json file, and DataService.cs class is created to access this json file.

    Make sure that Build Action property of the json file is set to Embedded Resource
    XAML
    Copy Code
        <Window
            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:local="clr-namespace:BollingerBOverlay"
            xmlns:c1="http://schemas.componentone.com/winfx/2006/xaml" 
            x:Class="BollingerBOverlay.MainWindow"
            DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}"
            mc:Ignorable="d"
            Title="MainWindow" Height="350" Width="525">
        <Grid>
    <c1:C1FinancialChart x:Name="financialChart"
                         ItemsSource="{Binding Data}"
                         Background="White"
                         ChartType="Candlestick"
                         BindingX="Date" 
                         ToolTipContent="{}{seriesName}&#x000A;{Date} {y}" 
                         Margin="6,37,4,71">            
                <c1:FinancialSeries Binding="High,Low,Open,Close" 
                                    SeriesName="Box Inc." />
                <c1:BollingerBands x:Name="bollinger" 
                                   Multiplier="2" 
                                   Period="20" 
                                   Binding="High,Low,Close" 
                                   SeriesName="Bollinger Bands" />
    
                <c1:C1FinancialChart.AxisX>
                    <c1:Axis LabelAngle="45" MajorUnit="3"/>
                </c1:C1FinancialChart.AxisX>
            </c1:C1FinancialChart>        
        </Grid>
    </Window>
    
       

    Make sure to add the following references in DataService.cs:

    Public Class DataService
        Public Function GetData() As List(Of Quote)
            Dim path As String = "OverlayVB.Resources.box.json"
            'Replace OverlayVB by your application name       
            Dim stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(path)
            Dim ser = New DataContractJsonSerializer(GetType(Quote()))
            Dim data = DirectCast(ser.ReadObject(stream), Quote())
            Return data.ToList()
        End Function
        Shared _ds As DataService
        Public Shared Function GetService() As DataService
            If _ds Is Nothing Then
                _ds = New DataService()
            End If
            Return _ds
        End Function
    End Class
    
    public class DataService
    {
        public List<Quote> GetData()
        {
            string path = "OverlayVB.Resources.box.json";
            // Replace OverlayVB by your application name       
            var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(path);
            var ser = new DataContractJsonSerializer(typeof(Quote[]));
            var data = (Quote[])ser.ReadObject(stream);
            return data.ToList();
        }
        private static DataService _ds;
        public static DataService GetService()
        {
            if (_ds == null)
                _ds = new DataService();
            return _ds;
        }
    }
    

    Json Data

    [
        { "date": "01/23/15", "open": 20.2, "high": 24.73, "low": 20.16, "close": 23.23, "volume": 42593223 }, 
        { "date": "01/26/15", "open": 23.67, "high": 24.39, "low": 22.5, "close": 22.6, "volume": 8677164 }, 
        { "date": "01/27/15", "open": 22, "high": 22.47, "low": 21.17, "close": 21.3, "volume": 3272512 }, 
        { "date": "01/28/15", "open": 21.62, "high": 21.84, "low": 19.6, "close": 19.78, "volume": 5047364 }, 
        { "date": "01/29/15", "open": 19.9, "high": 19.95, "low": 18.51, "close": 18.8, "volume": 3419482 }, 
        { "date": "01/30/15", "open": 18.47, "high": 19.48, "low": 18.22, "close": 18.81, "volume": 2266439 }, 
        { "date": "02/02/15", "open": 19.18, "high": 19.3, "low": 18.01, "close": 18.02, "volume": 2071168 }, 
        { "date": "02/03/15", "open": 18.22, "high": 18.64, "low": 18.12, "close": 18.24, "volume": 1587435 }, 
        { "date": "02/04/15", "open": 18.2, "high": 18.35, "low": 17, "close": 17.1, "volume": 2912224 }, 
        { "date": "02/05/15", "open": 17.3, "high": 17.31, "low": 16.41, "close": 16.66, "volume": 2682187 }, 
        { "date": "02/06/15", "open": 17.39, "high": 18.88, "low": 17.21, "close": 18.12, "volume": 3929164 }, 
        { "date": "02/09/15", "open": 18.86, "high": 19.95, "low": 18.45, "close": 19.6, "volume": 3226650 }, 
        { "date": "02/10/15", "open": 20.5, "high": 21, "low": 19.63, "close": 20.99, "volume": 2804409 }, 
        { "date": "02/11/15", "open": 20.89, "high": 21, "low": 20.2, "close": 20.96, "volume": 1698365 }, 
        { "date": "02/12/15", "open": 20.66, "high": 20.85, "low": 19.75, "close": 20.17, "volume": 1370320 }, 
        { "date": "02/13/15", "open": 20.19, "high": 20.68, "low": 20, "close": 20.18, "volume": 711951 }, 
        { "date": "02/17/15", "open": 19.5, "high": 20.1, "low": 18.8, "close": 19.05, "volume": 2093602 }, 
        { "date": "02/18/15", "open": 18.31, "high": 18.5, "low": 17.96, "close": 18, "volume": 1849490 }, 
        { "date": "02/19/15", "open": 18.33, "high": 19.25, "low": 17.91, "close": 18.96, "volume": 1311518 }, 
        { "date": "02/20/15", "open": 18.68, "high": 19.3, "low": 18.65, "close": 18.85, "volume": 1001692 }, 
        { "date": "02/23/15", "open": 18.8, "high": 18.89, "low": 18.11, "close": 18.21, "volume": 670087 }, 
        { "date": "02/24/15", "open": 18.46, "high": 19, "low": 18.27, "close": 18.83, "volume": 759263 }, 
        { "date": "02/25/15", "open": 18.83, "high": 19.48, "low": 18.47, "close": 18.67, "volume": 915580 }, 
        { "date": "02/26/15", "open": 18.64, "high": 19.2, "low": 18.64, "close": 18.94, "volume": 461283 }, 
        { "date": "02/27/15", "open": 18.8, "high": 19.12, "low": 18.55, "close": 18.66, "volume": 617199 }, 
        { "date": "03/02/15", "open": 18.66, "high": 19.09, "low": 18.65, "close": 18.79, "volume": 519605 }, 
        { "date": "03/03/15", "open": 18.79, "high": 19.21, "low": 18.45, "close": 18.59, "volume": 832415 }, 
        { "date": "03/04/15", "open": 18.64, "high": 19.05, "low": 18.32, "close": 19, "volume": 539688 }, 
        { "date": "03/05/15", "open": 19.2, "high": 19.2, "low": 18.8, "close": 19.14, "volume": 486149 }, 
        { "date": "03/06/15", "open": 19.03, "high": 19.1, "low": 18.7, "close": 18.91, "volume": 685659 }, 
        { "date": "03/09/15", "open": 18.98, "high": 20.15, "low": 18.96, "close": 19.4, "volume": 1321363 }, 
        { "date": "03/10/15", "open": 19.3, "high": 19.8, "low": 18.85, "close": 19.64, "volume": 615743 }, 
        { "date": "03/11/15", "open": 20.08, "high": 20.65, "low": 19.24, "close": 20.53, "volume": 2167167 }, 
        { "date": "03/12/15", "open": 17.17, "high": 18.2, "low": 16.76, "close": 18.2, "volume": 6837638 }, 
        { "date": "03/13/15", "open": 18.05, "high": 18.05, "low": 17.3, "close": 17.88, "volume": 1715629 }, 
        { "date": "03/16/15", "open": 17.91, "high": 18, "low": 17.01, "close": 17.13, "volume": 1321313 }, 
        { "date": "03/17/15", "open": 17.28, "high": 17.37, "low": 16.6, "close": 17.12, "volume": 1272242 }, 
        { "date": "03/18/15", "open": 17.1, "high": 17.27, "low": 16.91, "close": 17.01, "volume": 530063 }, 
        { "date": "03/19/15", "open": 17, "high": 17.28, "low": 17, "close": 17.06, "volume": 536427 }, 
        { "date": "03/20/15", "open": 17.13, "high": 17.24, "low": 16.88, "close": 17.21, "volume": 1320237 }, 
        { "date": "03/23/15", "open": 17.21, "high": 17.23, "low": 17.01, "close": 17.11, "volume": 509798 }, 
        { "date": "03/24/15", "open": 17.02, "high": 17.18, "low": 16.82, "close": 17, "volume": 962149 }, 
        { "date": "03/25/15", "open": 16.92, "high": 16.99, "low": 16.82, "close": 16.97, "volume": 565673 }, 
        { "date": "03/26/15", "open": 16.83, "high": 17.56, "low": 16.83, "close": 17.54, "volume": 884523 }, 
        { "date": "03/27/15", "open": 17.58, "high": 18.3, "low": 17.11, "close": 18.3, "volume": 705626 }, 
        { "date": "03/30/15", "open": 18.5, "high": 19.4, "low": 18.4, "close": 19.05, "volume": 1151620 }, 
        { "date": "03/31/15", "open": 19.08, "high": 20.58, "low": 18.4, "close": 19.75, "volume": 2020679 }, 
        { "date": "04/01/15", "open": 19.69, "high": 19.69, "low": 18.55, "close": 18.65, "volume": 961078 }, 
        { "date": "04/02/15", "open": 18.56, "high": 18.66, "low": 17.85, "close": 17.9, "volume": 884233 }, 
        { "date": "04/06/15", "open": 17.78, "high": 17.94, "low": 17.51, "close": 17.66, "volume": 605252 }, 
        { "date": "04/07/15", "open": 17.62, "high": 17.9, "low": 17.53, "close": 17.61, "volume": 591988 }, 
        { "date": "04/08/15", "open": 17.64, "high": 17.85, "low": 17.32, "close": 17.36, "volume": 618855 }, 
        { "date": "04/09/15", "open": 17.33, "high": 17.54, "low": 17.1, "close": 17.1, "volume": 761855 }, 
        { "date": "04/10/15", "open": 17.08, "high": 17.36, "low": 17, "close": 17.05, "volume": 568373 }, 
        { "date": "04/13/15", "open": 17.24, "high": 17.26, "low": 16.81, "close": 17.1, "volume": 667142 }, 
        { "date": "04/14/15", "open": 17.1, "high": 17.89, "low": 17.02, "close": 17.52, "volume": 870138 }, 
        { "date": "04/15/15", "open": 17.6, "high": 17.99, "low": 17.5, "close": 17.69, "volume": 530456 }, 
        { "date": "04/16/15", "open": 17.95, "high": 18, "low": 17.6, "close": 17.82, "volume": 548730 }, 
        { "date": "04/17/15", "open": 17.75, "high": 17.79, "low": 17.5, "close": 17.79, "volume": 446373 }, 
        { "date": "04/20/15", "open": 17.63, "high": 17.98, "low": 17.52, "close": 17.93, "volume": 487017 }, 
        { "date": "04/21/15", "open": 17.96, "high": 17.98, "low": 17.71, "close": 17.92, "volume": 320302 }, 
        { "date": "04/22/15", "open": 17.88, "high": 18.33, "low": 17.57, "close": 18.29, "volume": 644812 }, 
        { "date": "04/23/15", "open": 18.29, "high": 18.61, "low": 18.18, "close": 18.28, "volume": 563879 }, 
        { "date": "04/24/15", "open": 18.5, "high": 18.5, "low": 17.61, "close": 17.75, "volume": 650762 }, 
        { "date": "04/27/15", "open": 17.97, "high": 18.05, "low": 17.45, "close": 17.57, "volume": 437294 }, 
        { "date": "04/28/15", "open": 17.65, "high": 17.79, "low": 17.39, "close": 17.5, "volume": 224519 }, 
        { "date": "04/29/15", "open": 17.68, "high": 17.68, "low": 17.1, "close": 17.21, "volume": 495706 }, 
        { "date": "04/30/15", "open": 17.22, "high": 17.3, "low": 17, "close": 17.11, "volume": 391040 }, 
        { "date": "05/01/15", "open": 17.11, "high": 17.55, "low": 16.85, "close": 17.5, "volume": 563075 }, 
        { "date": "05/04/15", "open": 17.56, "high": 17.85, "low": 17.3, "close": 17.4, "volume": 253138 }, 
        { "date": "05/05/15", "open": 17.68, "high": 17.68, "low": 17.09, "close": 17.43, "volume": 290935 }, 
        { "date": "05/06/15", "open": 17.48, "high": 17.48, "low": 17, "close": 17.04, "volume": 313662 }, 
        { "date": "05/07/15", "open": 17.05, "high": 17.19, "low": 16.92, "close": 17.04, "volume": 360284 }, 
        { "date": "05/08/15", "open": 17.13, "high": 17.21, "low": 16.91, "close": 17.1, "volume": 297653 }, 
        { "date": "05/11/15", "open": 17.16, "high": 17.44, "low": 17.13, "close": 17.31, "volume": 268504 }, 
        { "date": "05/12/15", "open": 17.28, "high": 17.44, "low": 16.99, "close": 17.24, "volume": 376961 }, 
        { "date": "05/13/15", "open": 17.24, "high": 17.3, "low": 17.06, "close": 17.2, "volume": 244617 }, 
        { "date": "05/14/15", "open": 17.24, "high": 17.25, "low": 17.02, "close": 17.08, "volume": 252526 }, 
        { "date": "05/15/15", "open": 17.06, "high": 17.16, "low": 16.95, "close": 16.95, "volume": 274783 }, 
        { "date": "05/18/15", "open": 16.95, "high": 17.01, "low": 16.76, "close": 16.87, "volume": 418513 }, 
        { "date": "05/19/15", "open": 16.93, "high": 16.94, "low": 16.6, "close": 16.83, "volume": 367660 }, 
        { "date": "05/20/15", "open": 16.8, "high": 16.9, "low": 16.65, "close": 16.86, "volume": 297914 }, 
        { "date": "05/21/15", "open": 16.9, "high": 17.08, "low": 16.79, "close": 16.88, "volume": 229346 }, 
        { "date": "05/22/15", "open": 16.9, "high": 17.05, "low": 16.85, "close": 17, "volume": 253279 }, 
        { "date": "05/26/15", "open": 17.03, "high": 17.08, "low": 16.86, "close": 17.01, "volume": 212640 }, 
        { "date": "05/27/15", "open": 17.01, "high": 17.99, "low": 16.87, "close": 17.75, "volume": 857109 }, 
        { "date": "05/28/15", "open": 17.77, "high": 17.77, "low": 17.44, "close": 17.62, "volume": 338482 }
                ]
    

    Make sure to add the following references in code view:

    <DataContract>
    Public Class Quote
        <DataMember(Name:="date")>
        Public Property [Date]() As String
            Get
                Return m_Date
            End Get
            Set
                m_Date = Value
            End Set
        End Property
        Private m_Date As String
    
        <DataMember(Name:="high")>
        Public Property High() As Double
            Get
                Return m_High
            End Get
            Set
                m_High = Value
            End Set
        End Property
        Private m_High As Double
    
        <DataMember(Name:="low")>
        Public Property Low() As Double
            Get
                Return m_Low
            End Get
            Set
                m_Low = Value
            End Set
        End Property
        Private m_Low As Double
    
        <DataMember(Name:="open")>
        Public Property Open() As Double
            Get
                Return m_Open
            End Get
            Set
                m_Open = Value
            End Set
        End Property
        Private m_Open As Double
    
        <DataMember(Name:="close")>
        Public Property Close() As Double
            Get
                Return m_Close
            End Get
            Set
                m_Close = Value
            End Set
        End Property
        Private m_Close As Double
    
        <DataMember(Name:="volume")>
        Public Property Volume() As Double
            Get
                Return m_Volume
            End Get
            Set
                m_Volume = Value
            End Set
        End Property
        Private m_Volume As Double
    End Class
    ''' Interaction logic for MWBollinger.xaml
    Partial Public Class MWBollinger
        Inherits Window
        Private dataService As DataService = DataService.GetService()
        Public Sub New()
            InitializeComponent()
        End Sub
        Public ReadOnly Property Data() As List(Of Quote)
            Get
                Return dataService.GetData()
            End Get
        End Property
    End Class
    
        [DataContract]
        public class Quote
        {
            [DataMember(Name = "date")]
            public string Date { get; set; }
    
            [DataMember(Name = "high")]
            public double High { get; set; }
    
            [DataMember(Name = "low")]
            public double Low { get; set; }
    
            [DataMember(Name = "open")]
            public double Open { get; set; }
    
            [DataMember(Name = "close")]
            public double Close { get; set; }
    
            [DataMember(Name = "volume")]
            public double Volume { get; set; }
        }
        /// <summary>
        /// Interaction logic for MainWindow.xaml
        /// </summary>
        public partial class MainWindow : Window
        {
            DataService dataService = DataService.GetService();
            public MainWindow()
            {
                InitializeComponent();
            }
            public List<Quote> Data
            {
                get
                {
                    return dataService.GetData();
                }
            }        
        }
    }
    

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