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.
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.
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Make sure that Build Action property of the json file is set to Embedded Resource. |
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<Page xmlns:Finance="using:C1.Xaml.Chart.Finance" xmlns:Chart="using:C1.Xaml.Chart" xmlns:c1="using:C1.Xaml" x:Class="Bollinger.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Bollinger" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}"> <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> <Finance:C1FinancialChart x:Name="financialChart" ItemsSource="{Binding Data}" Background="White" ChartType="Candlestick" BindingX="Date" ToolTipContent="{}{seriesName}
{Date} {y}" Margin="6,37,4,71"> <Finance:FinancialSeries Binding="High,Low,Open,Close" SeriesName="Box Inc." /> <Finance:BollingerBands x:Name="bollinger" Multiplier="2" Period="20" Binding="High,Low,Close" SeriesName="Bollinger Bands" /> <Finance:C1FinancialChart.AxisX> <Chart:Axis LabelAngle="45" MajorUnit="3"/> </Finance:C1FinancialChart.AxisX> </Finance:C1FinancialChart> </Grid> |
Make sure to add the following references in DataService.cs:
Public Class DataService Public Function GetData() As List(Of Quote) Dim path As String = "BollingerVB.box.json" 'Replace BollingerVB by your application name Dim asm As Assembly = Me.[GetType]().GetTypeInfo().Assembly Dim stream = asm.GetManifestResourceStream(path) Dim ser = New DataContractJsonSerializer(GetType(Quote())) Dim data As Quote() = CType(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 = "Stochastic.Resources.box.json"; //Replace Stochastic by your application name var asm = this.GetType().GetTypeInfo().Assembly; var stream = asm.GetManifestResourceStream(path); var ser = new DataContractJsonSerializer(typeof(Quote[])); var data = (Quote[])ser.ReadObject(stream); return data.ToList(); } 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:
Public NotInheritable Class MainPage Inherits Page 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 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
public sealed partial class MainPage : Page { DataService dataService = DataService.GetService(); public MainPage() { this.InitializeComponent(); } public List<Quote> Data { get { return dataService.GetData(); } } } [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; } }