用AutoCAD的VBA编辑一个可以实现输入齿轮的模数和齿数输出二维齿轮图形的代码

在AutoCAD中使用VBA编写一个简单程序来生成齿轮图形，需要了解基本的VBA语法以及AutoLISP的API。以下是一个简单的示例，这个脚本假设用户会提供模数（m）和齿数（z）作为输入：

Sub DrawGear(m As Double, z As Integer)
    ' Import AutoCAD libraries
    Dim acadApp As AcadApplication
    Set acadApp = GetObject("AutoCAD.Application")
    
    ' Create a new drawing if it's not already open
    If acadApp.ActiveDocument Is Nothing Then
        acadApp.Documents.Add
    End If

    ' Define the gear parameters
    Dim d As Double 'Pitch diameter (2 * pi * m)
    Dim involute As Object 'Involute curve for the tooth
    d = Math.PI * 2 * m
    
    ' Loop through each tooth and create a circle for the involute
    For i = 0 To z - 1
        Set involute = acadApp.Modelspace.AddCircle(acadApp.ActiveDocument.ModelSpace.CenterPoint, d / z)
        
        ' Shift and mirror to get the tooth shape
        involute.MoveBy acGeVector3d(i * d / z, 0, 0) 'Shift along pitch line
        involute.RotateAt acadApp.ActiveDocument.ModelSpace.Current UCS, acadApp.ActiveDocument.ModelSpace.CenterPoint, 90 'Rotate by 90 degrees
    Next i
    
    ' Add a label with the input values
    acadApp.ActiveDocument.ModelSpace.AddText ("模数：" & m & ", 齿数：" & z).AlignToCenter
End Sub