在实体相交判断中的问题

sdaulj

请教高手，实体有无交点能不能判断？应该怎么判断？

能不能用IntersectWith命令判断？

请高手指点

如果不能的话有没有办法自己编程实现？

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Sub Example_IntersectWith()
    ' This example creates a line and circle and finds the points at
    ' which they intersect.
   
    ' Create the line
    Dim lineObj As AcadLine
    Dim startPt(0 To 2) As Double
    Dim endPt(0 To 2) As Double
    startPt(0) = 1: startPt(1) = 1: startPt(2) = 0
    endPt(0) = 5: endPt(1) = 5: endPt(2) = 0
    Set lineObj = ThisDrawing.ModelSpace.AddLine(startPt, endPt)
       
    ' Create the circle
    Dim circleObj As AcadCircle
    Dim centerPt(0 To 2) As Double
    Dim radius As Double
    centerPt(0) = 8: centerPt(1) = 8: centerPt(2) = 0
    radius = 1
    Set circleObj = ThisDrawing.ModelSpace.AddCircle(centerPt, radius)
    ZoomAll
     
    ' Find the intersection points between the line and the circle
    Dim intPoints As Variant
    intPoints = lineObj.IntersectWith(circleObj, acExtendNone)
   
    ' Print all the intersection points
    Dim I As Integer, j As Integer, k As Integer
    Dim str As String
    If VarType(intPoints) <> vbEmpty Then
        For I = LBound(intPoints) To UBound(intPoints)
            str = "Intersection Point[" & k & "] is: " & intPoints(j) & "," & intPoints(j + 1) & "," & intPoints(j + 2)
            MsgBox str, , "IntersectWith Example"
            str = ""
            I = I + 2
            j = j + 3
            k = k + 1
        Next
    End If
End Sub

这个例子中，通过判断数组是否为空，来看看是否有交点！

sdaulj

有没有实体相交判断的例子