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36 lines
2.4 KiB
Markdown
36 lines
2.4 KiB
Markdown
---
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title: "How to: Hit Test Geometry in a Visual"
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ms.date: "03/30/2017"
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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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- "hit tests [WPF], on visual objects comprising Geometry objects [WPF]"
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- "visual objects [WPF], hit tests on"
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- "Geometry objects [WPF], visual objects comprising"
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ms.assetid: 8bf2643f-d7f9-4cb4-9ea6-5b893c23200d
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---
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# How to: Hit Test Geometry in a Visual
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This example shows how to perform a hit test on a visual object that is composed of one or more <xref:System.Windows.Media.Geometry> objects.
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## Example
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The following example shows how to retrieve the <xref:System.Windows.Media.DrawingGroup> from a visual object that uses the <xref:System.Windows.Media.VisualTreeHelper.GetDrawing%2A> method. A hit test is then performed on the rendered content of each drawing in the <xref:System.Windows.Media.DrawingGroup> to determine which geometry was hit.
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> [!NOTE]
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> In most cases, you would use the <xref:System.Windows.Media.VisualTreeHelper.HitTest%2A> method to determine whether a point intersects any of the rendered content of a visual.
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[!code-csharp[VisualsOverview#VisualsOverviewSnippet4](~/samples/snippets/csharp/VS_Snippets_Wpf/VisualsOverview/CSharp/Window1.xaml.cs#visualsoverviewsnippet4)]
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[!code-vb[VisualsOverview#VisualsOverviewSnippet4](~/samples/snippets/visualbasic/VS_Snippets_Wpf/VisualsOverview/visualbasic/window1.xaml.vb#visualsoverviewsnippet4)]
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The <xref:System.Windows.Media.Geometry.FillContains%2A> method is an overloaded method that allows you to hit test by using a specified <xref:System.Windows.Point> or <xref:System.Windows.Media.Geometry>. If a geometry is stroked, the stroke can extend outside the fill bounds. In which case, you may want to call <xref:System.Windows.Media.Geometry.StrokeContains%2A> in addition to <xref:System.Windows.Media.Geometry.FillContains%2A>.
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You can also provide a <xref:System.Windows.Media.ToleranceType> that is used for the purposes of Bezier flattening.
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> [!NOTE]
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> This sample does not take into account any transforms or clipping that may be applied to the geometry. In addition, this sample will not work with a styled control, since it does not have any drawings directly associated with it.
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## See also
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- [Hit Testing in the Visual Layer](hit-testing-in-the-visual-layer.md)
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- [Hit Test Using Geometry as a Parameter](how-to-hit-test-using-geometry-as-a-parameter.md)
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