HOW TO：辨認應用程式筆勢

更新：2007 年 11 月

下列範例說明當使用者在 InkCanvas 上執行 ScratchOut 動作時，如何清除筆墨。本範例會假設 InkCanvas (名稱為 inkCanvas1) 已在 XAML 檔案中宣告。

範例

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Ink
Imports System.Collections.ObjectModel

Class Window1
    Inherits Window

    Public Sub New()
        InitializeComponent()

        If inkCanvas1.IsGestureRecognizerAvailable Then
            inkCanvas1.EditingMode = InkCanvasEditingMode.InkAndGesture
            AddHandler inkCanvas1.Gesture, AddressOf inkCanvas1_Gesture
            inkCanvas1.SetEnabledGestures(New ApplicationGesture() {ApplicationGesture.ScratchOut})
        End If

    End Sub 'New

    Private Sub inkCanvas1_Gesture(ByVal sender As Object, ByVal e As InkCanvasGestureEventArgs)

        Dim gestureResults As ReadOnlyCollection(Of GestureRecognitionResult) = _
                              e.GetGestureRecognitionResults()

        ' Check the first recognition result for a gesture.
        If gestureResults(0).RecognitionConfidence = _
           RecognitionConfidence.Strong AndAlso _
           gestureResults(0).ApplicationGesture = _
           ApplicationGesture.ScratchOut Then

            Dim hitStrokes As StrokeCollection = _
                inkCanvas1.Strokes.HitTest(e.Strokes.GetBounds(), 10)

            If hitStrokes.Count > 0 Then
                inkCanvas1.Strokes.Remove(hitStrokes)
            End If
        End If

    End Sub 'inkCanvas1_Gesture
End Class 'Window1

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Ink;
using System.Collections.ObjectModel;

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();

        if (inkCanvas1.IsGestureRecognizerAvailable)
        {
            inkCanvas1.EditingMode = InkCanvasEditingMode.InkAndGesture;
            inkCanvas1.Gesture += new InkCanvasGestureEventHandler(inkCanvas1_Gesture);
            inkCanvas1.SetEnabledGestures(
                new ApplicationGesture[] { ApplicationGesture.ScratchOut });
        }
    }

    void inkCanvas1_Gesture(object sender, InkCanvasGestureEventArgs e)
    {
        ReadOnlyCollection<GestureRecognitionResult> gestureResults =
            e.GetGestureRecognitionResults();

        // Check the first recognition result for a gesture.
        if ((gestureResults[0].RecognitionConfidence ==
            RecognitionConfidence.Strong) &&
           (gestureResults[0].ApplicationGesture ==
            ApplicationGesture.ScratchOut))
        {
            StrokeCollection hitStrokes = inkCanvas1.Strokes.HitTest(
                                            e.Strokes.GetBounds(), 10);

            if (hitStrokes.Count > 0)
            {
                inkCanvas1.Strokes.Remove(hitStrokes);
            }
        }
    }
}

請參閱

參考

ApplicationGesture

InkCanvas

Gesture