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43 lines
3.2 KiB
Markdown
43 lines
3.2 KiB
Markdown
---
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title: "How to: Create a Shape Using a StreamGeometry"
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description: Learn how to create a Shape using a StreamGeometry.
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ms.date: "03/30/2017"
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ms.custom: devdivchpfy22
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dev_langs:
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- "csharp"
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- "vb"
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helpviewer_keywords:
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- "graphics [WPF], shapes"
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- "shapes [WPF], creating with StreamGeometry class"
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ms.assetid: 08f7c8ce-074b-49cd-9aba-cc9592d4ee51
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---
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# How to: Create a Shape Using a StreamGeometry
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<xref:System.Windows.Media.StreamGeometry> is lightweight alternative to <xref:System.Windows.Media.PathGeometry> for creating geometric shapes. Use a <xref:System.Windows.Media.StreamGeometry> when you need to describe a complex geometry but do not want the overhead of supporting data binding, animation, or modification. For example, because of its efficiency, the <xref:System.Windows.Media.StreamGeometry> class is a good choice for describing adorners.
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## Create a triangular StreamGeometry
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The following example uses attribute syntax to create a triangular <xref:System.Windows.Media.StreamGeometry> in XAML.
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[!code-xaml[GeometriesMiscSnippets_snip#StreamGeometryTriangleExampleWholePage](~/samples/snippets/xaml/VS_Snippets_Wpf/GeometriesMiscSnippets_snip/XAML/StreamGeometryExample.xaml#streamgeometrytriangleexamplewholepage)]
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For more information about <xref:System.Windows.Media.StreamGeometry> attribute syntax, see the [Path Markup Syntax](path-markup-syntax.md) page.
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## Use a StreamGeometry to define a triangle
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The next example uses a <xref:System.Windows.Media.StreamGeometry> to define a triangle in code. First, the example creates a <xref:System.Windows.Media.StreamGeometry>, then obtains a <xref:System.Windows.Media.StreamGeometryContext> and uses it to describe the triangle.
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[!code-csharp[GeometriesMiscSnippets_procedural_snip#StreamGeometryTriangleExampleWholePage](~/samples/snippets/csharp/VS_Snippets_Wpf/GeometriesMiscSnippets_procedural_snip/CSharp/StreamGeometryTriangleExample.cs#streamgeometrytriangleexamplewholepage)]
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[!code-vb[GeometriesMiscSnippets_procedural_snip#StreamGeometryTriangleExampleWholePage](~/samples/snippets/visualbasic/VS_Snippets_Wpf/GeometriesMiscSnippets_procedural_snip/visualbasic/streamgeometrytriangleexample.vb#streamgeometrytriangleexamplewholepage)]
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## Create a geometric shape in code
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The next example creates a method that uses a <xref:System.Windows.Media.StreamGeometry> and <xref:System.Windows.Media.StreamGeometryContext> to define a geometric shape based on specified parameters.
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[!code-csharp[GeometriesMiscSnippets_procedural_snip#StreamGeometryExampleWholePage](~/samples/snippets/csharp/VS_Snippets_Wpf/GeometriesMiscSnippets_procedural_snip/CSharp/StreamGeometryExample.cs#streamgeometryexamplewholepage)]
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[!code-vb[GeometriesMiscSnippets_procedural_snip#StreamGeometryExampleWholePage](~/samples/snippets/visualbasic/VS_Snippets_Wpf/GeometriesMiscSnippets_procedural_snip/visualbasic/streamgeometryexample.vb#streamgeometryexamplewholepage)]
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## See also
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- <xref:System.Windows.Media.PathGeometry>
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- <xref:System.Windows.Media.StreamGeometry>
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- <xref:System.Windows.Media.StreamGeometryContext>
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- [Create a Shape by Using a PathGeometry](how-to-create-a-shape-by-using-a-pathgeometry.md)
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- [Geometry Overview](geometry-overview.md)
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