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20 lines
1.2 KiB
Markdown
20 lines
1.2 KiB
Markdown
---
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title: "How to: Erase Ink on a Custom Control"
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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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- "custom controls [WPF], erasing ink on"
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- "ink [WPF], erasing on custom control"
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ms.assetid: d88c50f9-b4d8-4962-a28b-67d6a15a5fe0
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---
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# How to: Erase Ink on a Custom Control
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The <xref:System.Windows.Ink.IncrementalStrokeHitTester> determines whether the currently drawn stroke intersects another stroke. This is useful for creating a control that enables a user to erase parts of a stroke, the way a user can on an <xref:System.Windows.Controls.InkCanvas> when the <xref:System.Windows.Controls.InkCanvas.EditingMode%2A> is set to <xref:System.Windows.Controls.InkCanvasEditingMode.EraseByPoint>.
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## Example
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The following example creates a custom control that enables the user to erase parts of strokes. This example creates a control that contains ink when it is initialized. To create a control that collects ink, see [Creating an Ink Input Control](creating-an-ink-input-control.md).
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[!code-csharp[HowToEraseInk#1](~/samples/snippets/csharp/VS_Snippets_Wpf/HowToEraseInk/CSharp/InkEraser.cs#1)]
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[!code-vb[HowToEraseInk#1](~/samples/snippets/visualbasic/VS_Snippets_Wpf/HowToEraseInk/VisualBasic/InkEraser.vb#1)]
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