# Construct Ellipses and Elliptical Arcs Example (VB.NET)

This example shows how to construct Ellipses and elliptical Arcs.

    '--------------------------------------------------------------
    ' Preconditions:
    ' 1. Create a VB.NET Windows console project.
    ' 2. Copy and paste this example into the VB.NET IDE.
    ' 3. Add a reference to:
    '    install_dir\APISDK\tlb\DraftSight.Interop.dsAutomation.dll.
    ' 4. Start DraftSight and open a document.
    ' 5. Start debugging the project.
    '
    ' Postconditions: A message box pops up when an Ellipse or
    ' elliptical Arc is inserted in the drawing document.
    '----------------------------------------------------------------

    Imports DraftSight.Interop.dsAutomation

    Module Module1

        Sub Main()
            Dim dsApp As Application
            Dim dsDoc As Document
            Dim dsModel As Model
            Dim dsSketchManager As SketchManager
            Dim dsEllipseRotation As EllipseArc
            Dim dsEllipseDistance As EllipseArc
            Dim dsEllipseArcDistance As EllipseArc
            Dim dsEllipseArcRotation As EllipseArc
            Dim x1, y1, x2, y2 As Double
            Dim rotation As Double
            Dim distanceToOtherAxis As Double
            Dim startAngle, endAngle As Double

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

            'Get active document
            dsDoc = dsApp.GetActiveDocument()
            If Not dsDoc Is Nothing Then

                'Get model space
                dsModel = dsDoc.GetModel()

                'Get Sketch Manager
                dsSketchManager = dsModel.GetSketchManager()

                'Ellipse rotation parameters (rotation parameter should be in radians)
                x1 = 0.0#
                y1 = 0.0#
                x2 = 10.0#
                y2 = 0.0#
                rotation = 3.14159265358979 / 4 '45 degrees in radians
                'Draw an ellipse
                dsEllipseRotation = dsSketchManager.InsertEllipseRotation(x1, y1, x2, y2, rotation)

                'Ellipse distance parameters
                x1 = 0.0#
                y1 = 0.0#
                x2 = 10.0#
                y2 = 0.0#
                distanceToOtherAxis = 3.0#
                'Draw an ellipse
                dsEllipseDistance = dsSketchManager.InsertEllipseDistanceToOtherAxis(x1, y1, x2, y2, distanceToOtherAxis)

                'Elliptical Arc distance parameters (start and end angle parameters should be in radians)
                x1 = 0.0#
                y1 = 0.0#
                x2 = 10.0#
                y2 = 0.0#
                distanceToOtherAxis = 2.0#
                startAngle = 0.0#
                endAngle = 3.14159265358979 '180 degrees in radians
                'Draw an elliptical Arc
                dsEllipseArcDistance = dsSketchManager.InsertEllipseArcDistanceToOtherAxis(x1, y1, x2, y2, distanceToOtherAxis, startAngle, endAngle)

                'Ellipitcal Arc rotation parameters (rotation, start, and end angle parameters should be in radians)
                x1 = 0.0#
                y1 = 0.0#
                x2 = 10.0#
                y2 = 0.0#
                rotation = 3.14159265358979 / 4 '45 degrees in radians
                startAngle = 0.0#
                endAngle = 3.14159265358979 '180 degrees in radians
                'Draw an elliptical Arc
                dsEllipseArcRotation = dsSketchManager.InsertEllipseArcRotation(x1, y1, x2, y2, rotation, startAngle, endAngle)

                If Not dsEllipseRotation Is Nothing Then
                    MsgBox("An ellipse using the specified axes end points and the angle of rotation was added to drawing.")
                End If

                If Not dsEllipseDistance Is Nothing Then
                    MsgBox("An ellipse using the specified axes end points and radius of the perpendicular axis was added to drawing.")
                End If

                If Not dsEllipseArcDistance Is Nothing Then
                    MsgBox("An elliptical Arc using the specified axes end points and radius of the perpendicular axis was added to drawing.")
                End If

                If Not dsEllipseArcRotation Is Nothing Then
                    MsgBox("An elliptical Arc using the specified axes end points, angle of rotation, and start and end angles was added to drawing.")
                End If

            Else

                MsgBox("There are no open documents in DraftSight.")

            End If

        End Sub

    End Module