GetDerivatives Method

Description

Evaluates the derivatives of the referenced curve at the points given by an array of parameters on the curve.

Syntax

Visual Basic
Public Sub GetDerivatives( _ ByVal NumParams As Long, _ ByRef Params() As Double, _ ByRef UPartials() As Double, _ ByRef VPartials() As Double, _ ByRef UUPartials() As Double, _ ByRef UVPartials() As Double, _ ByRef VVPartials() As Double, _ ByRef UUUPartials() As Double, _ ByRef VVVPartials() As Double _ )

Visual Basic

Public Sub GetDerivatives( _
   ByVal NumParams As Long, _
   ByRef Params() As Double, _
   ByRef UPartials() As Double, _
   ByRef VPartials() As Double, _
   ByRef UUPartials() As Double, _
   ByRef UVPartials() As Double, _
   ByRef VVPartials() As Double, _
   ByRef UUUPartials() As Double, _
   ByRef VVVPartials() As Double _
)

Parameters

NumParams: Specifies the number of parameters to be evaluated.
Params: Specifies the array of parameters at which to evaluate the curve.
UPartials: Returns the first order partial derivative with respect to u.
VPartials: Returns the first order partial derivative with respect to v.
UUPartials: Returns the second order partial derivatives with respect to u.
UVPartials: Returns the second order partial derivatives with respect to u and v.
VVPartials: Returns the second order partial derivatives with respect to v.
UUUPartials: Returns the third order partial derivatives with respect to u.
VVVPartials: Returns the third order partial derivatives with respect to v.

Remarks

The derivatives up to the third order can be output. You can choose to not obtain any of the derivatives by specifying a NULL in place of the corresponding output argument.

Example

Example (Visual Basic)

Private Sub Form_Load()
    Dim objApp As solidedgeframework.Application
    Dim objDoc As SolidEdgepart.PartDocument
    Dim objBody As solidedgegeometry.Body
    Dim objFace As solidedgegeometry.Face
    Dim dblParams(1) As Double
    Dim dblUPartials() As Double
    Dim dblVPartials() As Double
    Dim dblUUPartials() As Double
    Dim dblUVPartials() As Double
    Dim dblVVPartials() As Double
    Dim dblUUUPartials() As Double
    Dim dblVVVPartials() As Double
    Const TESTFILE = "T:\vbtests\testcases\HalfCyl.par"
    ' 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
    Call objDoc.Close
    ' opening the testfile
    Set objDoc = objApp.Documents.Open(TESTFILE)
    ' getting the body object of the model
    Set objBody = objDoc.Models(1).Body
    ' getting a particular face from the collection of faces on the body
    Set objFace = objBody.Faces(FaceType:=igQueryAll).Item(2)
    ' getting the derivatives at a point (u=0.5, v=0.5) on a Face
    dblParams(0) = PI / 2
    dblParams(1) = 0.05
    Call objFace.GetDerivatives(NumParams:=1, Params:=dblParams, UPartials:=dblUPartials, _
                                VPartials:=dblVPartials, UUPartials:=dblUUPartials, UVPartials:=dblUVPartials, _
                                VVPartials:=dblVVPartials, UUUPartials:=dblUUUPartials, VVVPartials:=dblVVVPartials)
    ' USER DISPLAY
    ' Release objects
    Set objApp = Nothing
    Set objDoc = Nothing
    Set objBody = Nothing
    Set objFace = Nothing
End Sub