# Construct Arc Example (VB.NET)

This example shows how to construct an Arc.

    '--------------------------------------------------------------
    ' 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 a Arc is
    ' constructed 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 dsArc As CircleArc
            Dim centerX, centerY, centerZ, radius 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()

                'Arc parameters (start and end angle values should be in radians)
                centerX = 0.0#
                centerY = 0.0#
                centerZ = 0.0#
                radius = 4.0#
                startAngle = 0.0#
                endAngle = 3.14159265358979 '180 degrees in radians

                'Construct an Arc
                dsArc = dsSketchManager.InsertArc(centerX, centerY, centerZ, radius, startAngle, endAngle)

                If Not dsArc Is Nothing Then
                    MsgBox("An Arc was added to drawing.")
                End If

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

        End Sub
    End Module