Use a PathGeometry object to highlight displayed text.

       

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="WpfApplication1.Window1"
  Title="Using a Path Geometry to Highlight Text"
  Background="PowderBlue">

  <StackPanel>
      <Button Margin="10" Grid.Column="2" Grid.Row="0" FontSize="16" Click="OnDisplayTextClick">Display Text</Button>
    <Canvas Margin="20" Height="150">
      <Path Canvas.Top="15" Canvas.Left="15" Stroke="SteelBlue" StrokeThickness="3" Fill="LightSteelBlue" Name="path" />
      <Ellipse Canvas.Top="0" Canvas.Left="0" Width="30" Height="30">
        <Ellipse.Fill>
          <RadialGradientBrush GradientOrigin="0.5,0.5" Center="0.5,0.5" RadiusX="0.5" RadiusY="0.5">
            <RadialGradientBrush.GradientStops>
              <GradientStop Color="Yellow" Offset="0.25" />
              <GradientStop Color="Transparent" Offset="1" />
            </RadialGradientBrush.GradientStops>
          </RadialGradientBrush>
        </Ellipse.Fill>

        <Ellipse.RenderTransform>
          <MatrixTransform />
        </Ellipse.RenderTransform>
        <Ellipse.Triggers>
          <EventTrigger RoutedEvent="FrameworkElement.Loaded">
            <EventTrigger.Actions>
            <BeginStoryboard>
              <Storyboard x:Name="storyboard">
                <MatrixAnimationUsingPath 
                  x:Name="matrixAnimation"
                  Duration="0:00:40"
                  RepeatBehavior="Forever"
                  Storyboard.TargetProperty="RenderTransform.Matrix" />
              </Storyboard>
            </BeginStoryboard>
            </EventTrigger.Actions>
          </EventTrigger>
        </Ellipse.Triggers>
      </Ellipse>
    </Canvas>
  </StackPanel>
</Window>

//File:Window.xaml.vb

Imports System
Imports System.Globalization
Imports System.Windows
Imports System.Windows.Media

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub

    Public Sub OnDisplayTextClick(sender As Object, e As EventArgs)
      Dim formattedText As New FormattedText("asdf", CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, New Typeface("Verdana"), 96, Brushes.Black)

      formattedText.SetFontWeight(FontWeights.Bold)

      Dim geometry As Geometry = formattedText.BuildGeometry(New Point(0, 0))

      Dim pathGeometry As PathGeometry = geometry.GetFlattenedPathGeometry()

      path.Data = pathGeometry

      matrixAnimation.PathGeometry = pathGeometry
    End Sub
  End Class
End Namespace

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1.	GeometryCombineMode = Union
2.	GeometryCombineMode = Intersect
3.	GeometryCombineMode = Xor
4.	GeometryCombineMode = Exclude
5.	Combine two circles into one shape using CombinedGeometry: Union
6.	Combine two circles into one shape using CombinedGeometry: Xor
7.	Combine two circles into one shape using CombinedGeometry: Intersect
8.	Combine two circles into one shape using CombinedGeometry: Exclude
9.	Combine Geometry
10.	LineGeometry for Path
11.	EllipseGeometry for Path
12.	BezierSegment for a Path
13.	Put EllipseGeometry to GeometryGroup
14.	Put RectangleGeometry to GeometryGroup
15.	Path based on GeometryGroup Resource
16.	GeometryDrawing.Brush
17.	GeometryDrawing.Pen
18.	GeometryDrawing with 2 PathFigures
19.	GeometryGroup and DrawingImage
20.	GeometryDrawing insize a DrawingGroup
21.	Use the StreamGeometry mini-language to create polyline
22.	Create a PathGeometry using the PathFigureCollection mini-language.
23.	PolyLineSegment creates a series of straight lines.
24.	LineGeometry vs Line
25.	RectangleGeometry vs Rectangle
26.	EllipseGeometry vs Ellipse
27.	Combine geometries is to use the GeometryGroup object
28.	Geometry Group
29.	GeometryDrawing Pen and Geometry
30.	CombinedGeometry GeometryCombineMode="Union"
31.	Reusing Geometry
32.	Converting text to geometry

Use a PathGeometry object to highlight displayed text. : Geometry « Windows Presentation Foundation « VB.Net

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