GetTangent Method

Description

Computes the unit-vector tangent at each of the points, given an array of parameter values on the curve.

Syntax

Visual Basic
Public Sub GetTangent( _ ByVal NumParams As Long, _ ByRef Params() As Double, _ ByRef Tangents() As Double _ )

Parameters

NumParams: Specifies the number of parameters to be evaluated.
Params: Specifies the array of parameters to be evaluated.
Tangents: Specifies the array of unit tangent vectors in the logical flow direction.

Remarks

The tangent is always pointed in the direction of the logical flow of the curve. If no inherent logical flow can be assigned (as in the case of an Edge shared by two Faces), the direction is the direction of increasing parameterization.

Example

Example (Visual Basic)

Private Sub Form_Load()
    Dim objApp As SolidEdgeFramework.Application
    Dim objDoc As SolidEdgePart.PartDocument
    Dim objBody As SolidEdgeGeometry.Body
    Dim objEdge As SolidEdgeGeometry.Edge
    Dim dblParams(1 To 2) As Double
    Dim dblTangents() As Double
    ' Report errors
    Const PI = 3.14159265358979
    ' Create/get the application with specific settings
    On Error Resume Next
    Set objApp = GetObject(, "SolidEdge.Application")
    If Err Then
        Err.Clear
        Set objApp = CreateObject("SolidEdge.Application")
        Set objDoc = objApp.Documents.Add("SolidEdge.PartDocument")
        objApp.Visible = True
    Else
        Set objDoc = objApp.ActiveDocument
    End If
    ' creating the base feature
    If CreateModel(objDoc) <> "" Then
        MsgBox "Error creating the model"
        Exit Sub
    End If
    ' getting the body object of the model
    Set objBody = objDoc.Models(1).Body
    'getting an edge form the collection of edges of the body object
    Set objEdge = objBody.Edges(EdgeType:=igQueryAll).Item(2)
    ' getting the tangent at a point on the edge
    dblParams(1) = 0
    dblParams(2) = PI
    Call objEdge.GetTangent(NumParams:=2, Params:=dblParams, Tangents:=dblTangents)
    ' USER DISPLAY
    ' Release objects
    Set objApp = Nothing
    Set objDoc = Nothing
    Set objBody = Nothing
    Set objEdge = Nothing
End Sub