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Rotate, Scale, Project, and Mirror a Line Entity Example (VBA)

This example shows how to use a math transform to rotate, scale, project, and mirror a Line entity.

'-----------------------------------------------------------------------------
' Preconditions:
' 1. Create a VBA macro in a software product in which VBA is
'    embedded.
' 2. Copy and paste this example into the Visual Basic IDE.
' 3. Add a reference to the DraftSight type library,
'    install_dir\bin\dsAutomation.dll.
' 4. Add a reference to the Microsoft Scripting Runtime library.
' 5. Start DraftSight.
' 6. Run the macro.
'
' Postconditions:
' 1. A Line is drawn, rotated, scaled, projected, and mirrored.
' 2. The transformation parameters are printed before
'    each transformation.
' 3. The Line parameters are printed before and after each
'    transformation.
'----------------------------------------------------------------

Dim dsApp As DraftSight.Application

Sub Main()
    'Connect to DraftSight
    Set dsApp = GetObject(, "DraftSight.Application")
    'Abort any command currently running in DraftSight
    'to avoid nested commands
    dsApp.AbortRunningCommand

    'Get active document
    Dim dsDoc As DraftSight.Document
    Set dsDoc = dsApp.GetActiveDocument()
    If dsDoc Is Nothing Then
        MsgBox ("There are no open documents in DraftSight.")
        Return
    End If

    'Get math utility
    Dim dsMathUtility As DraftSight.MathUtility
    Set dsMathUtility = dsApp.GetMathUtility()
   

    'Draw a Line
    Dim dsLine As Line
    Set dsLine = DrawLine(dsDoc)

    'Create different transformations
    Dim transformations As New Scripting.Dictionary

    'Create translation transformation
    Dim dsTranslationVector As DraftSight.MathVector
    Set dsTranslationVector = dsMathUtility.CreateVector(2, 3, 0)
    Dim dsTranslationTransformation As DraftSight.MathTransform
    Set dsTranslationTransformation = dsMathUtility.CreateTransformTranslation(dsTranslationVector)

    transformations.Add "translation", dsTranslationTransformation
    Call TransformLine(dsLine, "translation", transformations)

    'Create scaling transformation
    Dim dsCenterPoint As DraftSight.MathPoint
    Set dsCenterPoint = dsMathUtility.CreatePoint(0, 0, 0)
    Dim scaleFactor As Double
    scaleFactor = 1.2
    Dim dsScalingTransformation As DraftSight.MathTransform
    Set dsScalingTransformation = dsMathUtility.CreateTransformScaling(dsCenterPoint, scaleFactor)

    transformations.Add "scaling", dsScalingTransformation
    Call TransformLine(dsLine, "scaling", transformations)

    'Create rotation transformation
    Dim dsRotationAxis As DraftSight.MathVector
    Set dsRotationAxis = dsMathUtility.CreateVector(0, 0, 1)
    Dim rotationAngle As Double
    rotationAngle = 0.7875
    '45 degrees in radians
    Dim dsRotationTransformation As DraftSight.MathTransform
    Set dsRotationTransformation = dsMathUtility.CreateTransformRotation(dsCenterPoint, dsRotationAxis, rotationAngle)

    transformations.Add "rotation", dsRotationTransformation
    Call TransformLine(dsLine, "rotation", transformations)

    'Create mirror transformation about point
    Dim dsMirrorPoint As DraftSight.MathPoint
    Set dsMirrorPoint = dsMathUtility.CreatePoint(0, 0, 0)
    Dim dsMirrorAboutPointTransformation As DraftSight.MathTransform
    Set dsMirrorAboutPointTransformation = dsMathUtility.CreateTransformMirroringAboutPoint(dsMirrorPoint)

    transformations.Add "mirror about point", dsMirrorAboutPointTransformation
    Call TransformLine(dsLine, "mirror about point", transformations)

    'Create mirror transformation about Line
    Dim dsMirrorLine As DraftSight.MathLine
    Set dsMirrorLine = dsMathUtility.CreateLine(0, 0, 0, 0, 20, 0, dsMathLineType_e.dsMathLineType_Bounded)
    Dim dsMirrorAboutLineTransformation As DraftSight.MathTransform
    Set dsMirrorAboutLineTransformation = dsMathUtility.CreateTransformMirroringAboutLine(dsMirrorLine)

    transformations.Add "mirror about Line", dsMirrorAboutLineTransformation
    Call TransformLine(dsLine, "mirror about Line", transformations)

    'Create mirror transformation about plane
    Dim dsMirrorPlane As DraftSight.MathPlane
    Set dsMirrorPlane = dsMathUtility.CreateZXPlane()
    Dim dsMirrorAboutPlaneTransformation As DraftSight.MathTransform
    Set dsMirrorAboutPlaneTransformation = dsMathUtility.CreateTransformMirroringAboutPlane(dsMirrorPlane)

    transformations.Add "mirror about plane", dsMirrorAboutPlaneTransformation
    Call TransformLine(dsLine, "mirror about plane", transformations)

    'Create projection transformation
    Dim dsProjectionPlane As DraftSight.MathPlane
    Set dsProjectionPlane = dsMathUtility.CreateYZPlane()
    Dim dsProjectionDirection As DraftSight.MathVector
    Set dsProjectionDirection = dsMathUtility.CreateVector(1, 0, 0)
    Dim dsProjectionTransformation As DraftSight.MathTransform
    Set dsProjectionTransformation = dsMathUtility.CreateTransformProjection(dsProjectionPlane, dsProjectionDirection)

    transformations.Add "projection", dsProjectionTransformation
    Call TransformLine(dsLine, "projection", transformations)
End Sub

Sub TransformLine(dsLine As DraftSight.Line, keyString As String, transformations As Scripting.Dictionary)
  

    'Get the transformation by key out of the dictionary
    Dim transform As DraftSight.MathTransform
    Set transform = transformations(keyString)
   

    'Get MathLine property of Line entity
    Dim dsMathLine As DraftSight.MathLine
    Set dsMathLine = dsLine.MathLine

    'Print mathematical line parameters
    Call PrintMathLineParameters(dsMathLine)

    'Print transformation parameters
    Call PrintMathTransformation(keyString, transform)

    'Transform mathematical line
    dsMathLine.TransformBy transform

    'Update Line
    dsLine.MathLine = dsMathLine

    MsgBox ("The transformation " & keyString & " has been applied to the Line.")

    'Zoom by window
    Dim lowerLeftCorner(0 To 2) As Double
    lowerLeftCorner(0) = -10
    lowerLeftCorner(1) = -10
    lowerLeftCorner(2) = 0
    Dim upperRightCorner(0 To 2) As Double
    upperRightCorner(0) = 10
    upperRightCorner(1) = 10
    upperRightCorner(2) = 0
    dsApp.Zoom dsZoomRange_e.dsZoomRange_Window, lowerLeftCorner, upperRightCorner

    'Print result mathematical line parameters
    Call PrintMathLineParameters(dsMathLine)
  

End Sub

Function DrawLine(dsDoc As DraftSight.Document) As DraftSight.Line
    'Get model space
    Dim dsModel As DraftSight.Model
    Set dsModel = dsDoc.GetModel()

    'Get sketch manager
    Dim dsSketchMgr As DraftSight.SketchManager
    Set dsSketchMgr = dsModel.GetSketchManager()

    'Draw a Line
    Dim startPoint(0 To 2) As Double
    startPoint(0) = 1
    startPoint(1) = 1
    startPoint(2) = 0
    Dim endPoint(0 To 2) As Double
    endPoint(0) = 5
    endPoint(1) = 1
    endPoint(2) = 0

    Set DrawLine = dsSketchMgr.InsertLine(startPoint(0), startPoint(1), startPoint(2), endPoint(0), endPoint(1), endPoint(2))
End Function

Sub PrintMathTransformation(transformationName As String, dsMathTransformation As DraftSight.MathTransform)
    Debug.Print ("The " & transformationName & " transformation:")

    Dim countOfRows As Long
    countOfRows = 4
    Dim countOfColumns As Long
    countOfColumns = 4
       

    Dim i As Long
    Dim j As Long

    For i = 0 To countOfRows - 1
        Dim rowInformation As String
        rowInformation = "("

        For j = 0 To countOfColumns - 1
            rowInformation = rowInformation & dsMathTransformation.GetElementAt(i, j)

            If j <> countOfColumns - 1 Then
                rowInformation = rowInformation & "  ,  "
            End If
        Next

        rowInformation = rowInformation & ");"

        Debug.Print (rowInformation)
    Next
End Sub

Sub PrintMathLineParameters(dsMathLine As DraftSight.MathLine)
    Debug.Print ("Mathematical line parameters: ")

    Debug.Print ("Type = " & dsMathLine.GetType)

    'Get start point
    Dim dsPoint As DraftSight.MathPoint
    Set dsPoint = dsMathLine.startPoint

    Dim x As Double, y As Double, z As Double
    dsPoint.GetPosition x, y, z

    Debug.Print ("StartPoint: " & x & ", " & y & ", " & z)

    'Get end point
    Set dsPoint = dsMathLine.endPoint

    dsPoint.GetPosition x, y, z

    Debug.Print ("EndPoint: " & x & ", " & y & ", " & z)

    'Get direction
    Dim dsVector As DraftSight.MathVector
    dsMathLine.GetDirection dsVector

    dsVector.GetCoordinates x, y, z

    Debug.Print ("Direction: " & x & ", " & y & ", " & z)

    Debug.Print ("Length = " & dsMathLine.GetLength())
End Sub



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