WPF Charting Documentation - SciChart WPF Charts SDK v8.x
SciChart WPF 2D Charts > The Trading Drawing Tools API > Fibonacci Extension Drawing Tool
Fibonacci Extension Drawing Tool

FibonacciExtensionAnnotation is an annotation useful for trading charts based on a Fibonacci Ratio.  It prorjects the Fibonacci Trable to a third (extended) point on the chart.

Note: The Drawing Tools API in SciChart.Charting.DrawingTools is available in the Enterprise and SDK Editions of SciChart only

 

As the FibonacciExtensionAnnotation is a CompositeAnnotation (annotation that consists of a number of other annotations) it has no special properties, only common properties of usual annotations.

The FibonacciRetracementAnnotation consists of:

  • Two lines – which are actually LineAnnotations
    • The first is a trendline
    • The second is used for projecting the FibonnaciTable to some future point
  • FibonacciTable – which is a CompositeAnnotation that consists of multiple of FibonacciRatioLine annotations.
  • FibonacciRatioLine has all properties of HorizontalLineAnnotation and one special property, called “LineLevel”. This property corresponds to a level value(in percentage).

 

Adding FibonacciExtensionAnnotation via mouse click

To add FibonacciExtensionAnnotation via mouse click you have to add TradingAnnotationCreationModifier to your SciChartSurface.ChartModifier and set AnnotationType as FibonacciExtensionAnnotation. Please see the article on the TradingAnnotationCreationModifier for how to use this type.

Declaring a FibonacciExtensionAnnotation in XAML

To declare a FibonacciRetracementAnnotation in XAML you have to declare the annotation and then declare its InitialBasePoints collection that is actually collection of ComparablePoint objects. ComparablePoint stores X and Y values that are used for placing annotation point.

Declaring a FibonnacciRetracementAnnotation in XAML
Copy Code 
<!-- XAxis, YAxis, RenderableSeries omitted for brevity -->
<s:SciChartSurface.Annotations>
               
    <!--Declare FibonacciExtensionAnnotation-->
    <s:FibonacciExtensionAnnotation IsEditable="True">
                   
        <!-- Declare InitialBasePoints collection that is used for
             creating annotation from XAML.
             InitialBasePoints is actually observable collection of
             ComparablePoint-s. ComparablePoint stores X and Y point Value.
        -->
        <s:FibonacciExtensionAnnotation.InitialBasePoints>
           <!-- Placing first point -->
           <s:ComparablePoint X="2"  Y="4"/>
           <!-- Placing second point -->
           <s:ComparablePoint X="9"  Y="-4"/>
           <!-- Placing third point -->
           <s:ComparablePoint X="9"  Y="-4"/>
   
         </s:FibonacciExtensionAnnotation.InitialBasePoints>
     </s:FibonacciExtensionAnnotation>
</s:SciChartSurface.Annotations>

Please Note that the FibonacciExtensionAnnotation has limit of three base points. As you can see here, you just have to set this three points for FibonacciExtensionAnnotation: [X1=0; Y1=0], [X2=6; Y2=6] and [X3=10; Y3=2].

 

Declaring a FibonacciExtensionAnnotation in Code-Behind

To add a FibonacciExtensionAnnotation in code, simply use the following C# code:

Declaring a FibonnacciExtensionAnnotation in Code
Copy Code 
// Create a SciChartSurface. XAxis, YAxis omitted for brevity
var sciChartSurface = new SciChartSurface();
// Create a FibonacciExtensionAnnotation.
var fibonacciExtension = new FibonacciExtensionAnnotation();
// FibonacciExtensionAnnotation should be added to
//SciChartSurface.Annotation collection first, to make SetBasePoint() method
//works correctly
sciChart.Annotations.Add(fibonacciExtension);
// Set first point of FibonacciExtensionAnnotation
fibonacciExtension.SetBasePoint(0, 0);
   
// Set second point of FibonacciExtensionAnnotation
fibonacciExtension.SetBasePoint(6, 6);
 // Set third point of FibonacciExtensionAnnotation
fibonacciExtension.SetBasePoint(10, 2);

 

Declaring a FibonacciExtensionAnnotation in MVVM

To add a FibonacciExtensionAnnotation via MVVM please follow the instructions for adding annotations with MVVM: Declaring Annotations in MVVM with the AnnotationsBinding Markup Extension

To add a FibonacciExtensionAnnotation via a ViewModel you have to use SciChart markup extension called AnnotationsBinding,

The AnnotationsBinding Markup Extension
Copy Code 
<s:SciChartSurface Annotations="{s:AnnotationsBinding Annotations}">
</s:SciChartSurface>

Now you need to create collection for Annotations in ViewModel. Then create and add a FibonacciExtensionAnnotationViewModel to that collection of Annotations like this:

Declaring a FibonnacciExtensionAnnotation in a ViewModel
Copy Code 
public class MyViewModel : INotifyPropertyChanged
 {   
      public ObservableCollection<IAnnotationViewModel> Annotations { get; }
    
      public void Foo()
      {
            // Create a FibonacciExtensionAnnotation.
            fibonacciExtension = new FibonacciExtensionAnnotationViewModel();
            // FibonacciExtensionAnnotation should be added to
            //SciChartSurface.Annotation collection first, to make SetBasePoint() method
            //works correctly
            Annotations.Add(fibonacciExtension);
            // Set first point of FibonacciExtensionAnnotation
            fibonacciExtension.SetBasePoint(0, 0);
               
            // Set second point of FibonacciExtensionAnnotation
            fibonacciExtension.SetBasePoint(6, 6);
             // Set third point of FibonacciExtensionAnnotation
            fibonacciExtension.SetBasePoint(10, 2);
      }
 }