RayHitTestParameters.Direction 属性
定义
重要
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获取或设置一个 Vector3D，它指示沿其执行命中测试的射线的方向（从其原点开始）。
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.Vector3DPublic ReadOnly Property Direction As Vector3D属性值
Vector3D，它指示沿其执行命中测试的射线的方向。
示例
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)
注解
请注意，视觉层支持针对点或几何图形下的所有对象进行命中测试，而不仅仅是最顶层的对象。 2D 命中测试还将直接返回指定点或几何图形下的 3D 结果。