RayHitTestParameters.Direction 屬性

定義

命名空間:

System.Windows.Media.Media3D

組件:

PresentationCore.dll

取得或設定 Vector3D，指定沿著其路徑進行點擊測試之射線的方向 (從其原點開始)。

public:
 property System::Windows::Media::Media3D::Vector3D Direction { System::Windows::Media::Media3D::Vector3D get(); };

public System.Windows.Media.Media3D.Vector3D Direction { get; }

member this.Direction : System.Windows.Media.Media3D.Vector3D

Public ReadOnly Property Direction As Vector3D

屬性值

Vector3D

指出沿著其路徑進行點擊測試之射線方向的 Vector3D。

範例

public void HitTest(object sender, System.Windows.Input.MouseButtonEventArgs args)
{
    Point mouseposition = args.GetPosition(myViewport);
    Point3D testpoint3D = new Point3D(mouseposition.X, mouseposition.Y, 0);
    Vector3D testdirection = new Vector3D(mouseposition.X, mouseposition.Y, 10);
    PointHitTestParameters pointparams = new PointHitTestParameters(mouseposition);
    RayHitTestParameters rayparams = new RayHitTestParameters(testpoint3D, testdirection);

    //test for a result in the Viewport3D
    VisualTreeHelper.HitTest(myViewport, null, HTResult, pointparams);

Public Sub HitTest(ByVal sender As Object, ByVal args As MouseButtonEventArgs)
    Dim mouseposition As Point = args.GetPosition(myViewport)
    Dim testpoint3D As New Point3D(mouseposition.X, mouseposition.Y, 0)
    Dim testdirection As New Vector3D(mouseposition.X, mouseposition.Y, 10)
    Dim pointparams As New PointHitTestParameters(mouseposition)
    Dim rayparams As New RayHitTestParameters(testpoint3D, testdirection)

    'test for a result in the Viewport3D
    VisualTreeHelper.HitTest(myViewport, Nothing, AddressOf HTResult, pointparams)

備註

請注意，視覺層支援對點或幾何下的所有物件進行點擊測試，而不只是最上層的物件。 2D 點擊測試也會直接在指定的點或幾何底下傳回 3D 結果。

另請參閱

• HitTest(Visual3D, HitTestFilterCallback, HitTestResultCallback, HitTestParameters3D)