How to: Create Outlined Text
In most cases, when you are adding ornamentation to text strings in your Windows Presentation Foundation (WPF) application, you are using text in terms of a collection of discrete characters, or glyphs. For example, you could create a linear gradient brush and apply it to the Foreground property of a TextBox object. When you display or edit the text box, the linear gradient brush is automatically applied to the current set of characters in the text string.
However, you can also convert text into Geometry objects, allowing you to create other types of visually rich text. For example, you could create a Geometry object based on the outline of a text string.
When text is converted to a Geometry object, it is no longer a collection of characters—you cannot modify the characters in the text string. However, you can affect the appearance of the converted text by modifying its stroke and fill properties. The stroke refers to the outline of the converted text; the fill refers to the area inside the outline of the converted text.
The following examples illustrate several ways of creating visual effects by modifying the stroke and fill of converted text.
It is also possible to modify the bounding box rectangle, or highlight, of the converted text. The following example illustrates a way to creating visual effects by modifying the stroke and highlight of converted text.
The key to converting text to a Geometry object is to use the FormattedText object. Once you have created this object, you can use the BuildGeometry and BuildHighlightGeometry methods to convert the text to Geometry objects. The first method returns the geometry of the formatted text; the second method returns the geometry of the formatted text's bounding box. The following code example shows how to create a FormattedText object and to retrieve the geometries of the formatted text and its bounding box.
''' <summary> ''' Create the outline geometry based on the formatted text. ''' </summary> Public Sub CreateText() Dim fontStyle As FontStyle = FontStyles.Normal Dim fontWeight As FontWeight = FontWeights.Medium If Bold = True Then fontWeight = FontWeights.Bold End If If Italic = True Then fontStyle = FontStyles.Italic End If ' Create the formatted text based on the properties set. Dim formattedText As New FormattedText(Text, CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, New Typeface(Font, fontStyle, fontWeight, FontStretches.Normal), FontSize, Brushes.Black) ' This brush does not matter since we use the geometry of the text. ' Build the geometry object that represents the text. _textGeometry = formattedText.BuildGeometry(New Point(0, 0)) ' Build the geometry object that represents the text hightlight. If Highlight = True Then _textHighLightGeometry = formattedText.BuildHighlightGeometry(New Point(0, 0)) End If End Sub
In order to display the retrieved the Geometry objects, you need to access the DrawingContext of the object that is displaying the converted text. In these code examples, this is done by creating a custom control object that is derived from a class that supports user-defined rendering.
''' <summary> ''' OnRender override draws the geometry of the text and optional highlight. ''' </summary> ''' <param name="drawingContext">Drawing context of the OutlineText control.</param> Protected Overrides Sub OnRender(ByVal drawingContext As DrawingContext) ' Draw the outline based on the properties that are set. drawingContext.DrawGeometry(Fill, New Pen(Stroke, StrokeThickness), _textGeometry) ' Draw the text highlight based on the properties that are set. If Highlight = True Then drawingContext.DrawGeometry(Nothing, New Pen(Stroke, StrokeThickness), _textHighLightGeometry) End If End Sub