TouchFrameEventArgs.GetTouchPoints(IInputElement) 메서드

정의

네임스페이스:

System.Windows.Input

어셈블리:

PresentationCore.dll

지정된 요소를 기준으로 각 활성 터치 디바이스에 대한 현재 터치 지점을 포함하는 컬렉션을 반환합니다.

public:
 System::Windows::Input::TouchPointCollection ^ GetTouchPoints(System::Windows::IInputElement ^ relativeTo);

public System.Windows.Input.TouchPointCollection GetTouchPoints (System.Windows.IInputElement relativeTo);

member this.GetTouchPoints : System.Windows.IInputElement -> System.Windows.Input.TouchPointCollection

Public Function GetTouchPoints (relativeTo As IInputElement) As TouchPointCollection

매개 변수

relativeTo

IInputElement

좌표 공간을 정의하는 요소입니다. WPF 절대 좌표를 사용하려면 relativeTo를 null로 지정합니다.

반환

TouchPointCollection

각 활성 TouchPoint에 대한 현재 TouchDevice를 포함하는 컬렉션입니다.

예제

다음 코드에서 터치 지점을 검색 하는 프로세스는 TouchFrameEventArgs합니다. 캔버스에서 터치를 누르면는 TouchDevice 캔버스에 캡처됩니다. 터치가 발생 하는 경우는 TouchDevice 해제 됩니다. 캔버스에서 터치가 이동할 때는 Id 확인란이 선택 되어 있습니다. 경우는 Id 일치 하는 Id 첫 번째 터치를 나타내는 기본 터치 지점의 위치 기록 됩니다. 두 번째 터치에서 이동 하는 경우, 두 번째 터치 위치를 줄의 첫 번째 터치 위치에서 그려집니다.

이 예제는에서 사용할 수 있는 보다 큰 예제의 일부는 Touch 클래스 개요입니다.

foreach (TouchPoint _touchPoint in e.GetTouchPoints(this.canvas1))
{
    if (_touchPoint.Action == TouchAction.Down)
    {
        // Clear the canvas and capture the touch to it.
        this.canvas1.Children.Clear();
        _touchPoint.TouchDevice.Capture(this.canvas1);
    }

    else if (_touchPoint.Action == TouchAction.Move && e.GetPrimaryTouchPoint(this.canvas1) != null)
    {   
        // This is the first (primary) touch point. Just record its position.
        if (_touchPoint.TouchDevice.Id == e.GetPrimaryTouchPoint(this.canvas1).TouchDevice.Id)
        {
            pt1.X = _touchPoint.Position.X;
            pt1.Y = _touchPoint.Position.Y;
        }

        // This is not the first touch point. Draw a line from the first point to this one.
        else if (_touchPoint.TouchDevice.Id != e.GetPrimaryTouchPoint(this.canvas1).TouchDevice.Id)
        {
            pt2.X = _touchPoint.Position.X;
            pt2.Y = _touchPoint.Position.Y;

            Line _line = new Line();
            _line.Stroke = new RadialGradientBrush(Colors.White, Colors.Black);
            _line.X1 = pt1.X;
            _line.X2 = pt2.X;
            _line.Y1 = pt1.Y;
            _line.Y2 = pt2.Y;
            _line.StrokeThickness = 2;
            this.canvas1.Children.Add(_line);
        }
    }

    else if (_touchPoint.Action == TouchAction.Up)
    {
        // If this touch is captured to the canvas, release it.
        if (_touchPoint.TouchDevice.Captured == this.canvas1)
        {
            this.canvas1.ReleaseTouchCapture(_touchPoint.TouchDevice);
        }
    }
}

For Each _touchPoint In e.GetTouchPoints(Me.canvas1)

    If _touchPoint.Action = TouchAction.Down Then
        ' Clear the canvas and capture the touch to it.
        canvas1.Children.Clear()
        _touchPoint.TouchDevice.Capture(canvas1)

    ElseIf _touchPoint.Action = TouchAction.Move Then
        ' This is the first (primary) touch point. Just record its position.
        If _touchPoint.TouchDevice.Id = e.GetPrimaryTouchPoint(Me.canvas1).TouchDevice.Id Then
            pt1.X = _touchPoint.Position.X
            pt1.Y = _touchPoint.Position.Y

            ' This is not the first touch point; draw a line from the first point to this one.
        ElseIf _touchPoint.TouchDevice.Id <> e.GetPrimaryTouchPoint(Me.canvas1).TouchDevice.Id Then
            pt2.X = _touchPoint.Position.X
            pt2.Y = _touchPoint.Position.Y

            Dim _line As New Line()
            _line.Stroke = New RadialGradientBrush(Colors.White, Colors.Black)
            _line.X1 = pt1.X
            _line.X2 = pt2.X
            _line.Y1 = pt1.Y
            _line.Y2 = pt2.Y

            _line.StrokeThickness = 2
            Me.canvas1.Children.Add(_line)
        End If

    ElseIf _touchPoint.Action = TouchAction.Up Then
        ' If this touch is captured to the canvas, release it.
        If (_touchPoint.TouchDevice.Captured Is canvas1) Then
            canvas1.ReleaseTouchCapture(_touchPoint.TouchDevice)
        End If
    End If
Next