IntersectionDetail 枚举

定义

命名空间:

System.Windows.Media

程序集:

PresentationCore.dll

提供有关 GeometryHitTestParameters 中的几何图形与点击过的可视对象之间的交集的信息。

public enum class IntersectionDetail

public enum IntersectionDetail

type IntersectionDetail = 

Public Enum IntersectionDetail

继承

Object

ValueType

Enum

IntersectionDetail

字段

Empty	1	Geometry 命中测试参数与目标可视对象（即几何图形）不相交。
FullyContains	3	Geometry 命中测试参数完全包含在目标可视对象（即几何图形）的边界内。
FullyInside	2	目标可视对象（即几何图形）完全位于 Geometry 命中测试参数内。
Intersects	4	Geometry 命中测试参数与目标可视对象（即几何图形）相交。 这意味着两个元素重叠，但任何一个元素都不包含对方。
NotCalculated	0	不计算 IntersectionDetail 值。

示例

以下示例演示如何使用 . IntersectionDetail 的属性 GeometryHitTestResult。

// Return the result of the hit test to the callback.
public HitTestResultBehavior MyHitTestResultCallback(HitTestResult result)
{
    // Retrieve the results of the hit test.
    IntersectionDetail intersectionDetail = ((GeometryHitTestResult)result).IntersectionDetail;

    switch (intersectionDetail)
    {
        case IntersectionDetail.FullyContains:

            // Add the hit test result to the list that will be processed after the enumeration.
            hitResultsList.Add(result.VisualHit);

            return HitTestResultBehavior.Continue;

        case IntersectionDetail.Intersects:

            // Set the behavior to return visuals at all z-order levels.
            return HitTestResultBehavior.Continue;

        case IntersectionDetail.FullyInside:

            // Set the behavior to return visuals at all z-order levels.
            return HitTestResultBehavior.Continue;

        default:
            return HitTestResultBehavior.Stop;
    }
}

' Return the result of the hit test to the callback.
Public Function MyHitTestResultCallback(ByVal result As HitTestResult) As HitTestResultBehavior
    ' Retrieve the results of the hit test.
    Dim intersectionDetail As IntersectionDetail = (CType(result, GeometryHitTestResult)).IntersectionDetail

    Select Case intersectionDetail
        Case IntersectionDetail.FullyContains

            ' Add the hit test result to the list that will be processed after the enumeration.
            hitResultsList.Add(result.VisualHit)

            Return HitTestResultBehavior.Continue

        Case IntersectionDetail.Intersects

            ' Set the behavior to return visuals at all z-order levels.
            Return HitTestResultBehavior.Continue

        Case IntersectionDetail.FullyInside

            ' Set the behavior to return visuals at all z-order levels.
            Return HitTestResultBehavior.Continue

        Case Else
            Return HitTestResultBehavior.Stop
    End Select
End Function

注解

下图显示了命中测试几何图形 (蓝色圆) 与 (红色方块) 之间的关系。

命中测试几何图形与命中测试期间视觉几何图形之间的交集