14.5 数据记录和AutoCAD实体的对应(VBA 二次开发教程)

兰州人 发表于 2006-7-10 10:47:00

14.5.2 编程思路
1 ObjectID、Handle和对象本身
2 记录和实体对应的惟一性
我希望与各位VBA发烧友和班竹共同探讨以上两个问题。
a ObjectID、Handle相关语句的描述
b 记录和实体对应的惟一性的认识
c lsp语句的相关表述

兰州人 发表于 2006-7-10 12:53:00

Handle
根据“开发者文档”的一个实例对Handle的理解
Sub Example_Handle()
    ' This example creates several objects in model space.
    ' It then iterates through the objects in model space and displays the
    ' Handle for each object found.
    
    ' Create a Ray object in model space
    Dim rayObj As AcadRay
    Dim basePoint(0 To 2) As Double
    Dim SecondPoint(0 To 2) As Double
    basePoint(0) = 3#: basePoint(1) = 3#: basePoint(2) = 0#
    SecondPoint(0) = 1#: SecondPoint(1) = 3#: SecondPoint(2) = 0#
    Set rayObj = ThisDrawing.ModelSpace.AddRay(basePoint, SecondPoint)
    
    ' Create a polyline object in model space
    Dim plineObj As AcadLWPolyline
    Dim points(0 To 5) As Double
    points(0) = 3: points(1) = 7
    points(2) = 9: points(3) = 2
    points(4) = 3: points(5) = 5
    Set plineObj = ThisDrawing.ModelSpace.AddLightWeightPolyline(points)
    plineObj.Closed = True
 <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>
    ' Create a line object in model space
    Dim lineObj As AcadLine
    Dim startPoint(0 To 2) As Double
    Dim endPoint(0 To 2) As Double
    startPoint(0) = 0: startPoint(1) = 0: startPoint(2) = 0
    endPoint(0) = 2: endPoint(1) = 2: endPoint(2) = 0
    Set lineObj = ThisDrawing.ModelSpace.AddLine(startPoint, endPoint)
    
    ' Create a circle object in model space
    Dim circObj As AcadCircle
    Dim centerPt(0 To 2) As Double
    Dim radius As Double
    centerPt(0) = 5: centerPt(1) = 3: centerPt(2) = 0
    radius = 3
    Set circObj = ThisDrawing.ModelSpace.AddCircle(centerPt, radius)
 <o:p></o:p>
    ' Create an ellipse object in model space
    Dim ellObj As AcadEllipse
    Dim majAxis(0 To 2) As Double
    Dim center(0 To 2) As Double
    Dim radRatio As Double
    center(0) = 5#: center(1) = 5#: center(2) = 0#
    majAxis(0) = 10: majAxis(1) = 20#: majAxis(2) = 0#
    radRatio = 0.3
    Set ellObj = ThisDrawing.ModelSpace.AddEllipse(center, majAxis, radRatio)
 <o:p></o:p>
 <o:p></o:p>
    ZoomAll
    
    ' Iterate through the model space collection and display
    ' the handle of each object found.
    
    Dim entHandle As String
    Dim entry As AcadEntity
    For Each entry In ThisDrawing.ModelSpace
        entHandle = entry.Handle
        entry.Highlight (True)
        MsgBox "The handle of this object is " & entHandle, vbInformation, "Handle Example"
        entry.Highlight (False)
    Next
End Sub
 <o:p></o:p>
 <o:p></o:p>
 <o:p></o:p>
问题1: Dim entry As AcadEntity 在开发者文档中没有查到AcadEntity，AcadEntity什么意思？
问题2: entry.Highlight (True) 是否为 在AutoCAD 的select命令，控制选择亮显功能
问题3: vbInformation在开发者文档中没查到，Debug.print为64，从字面翻译为VB信息，是版号还是其它意思？
问题4: 对Each entry In ThisDrawing.ModelSpace的理解,在这个模型空间在循环找到每个实体？相比在lsp中完成这个功能要简单。
 <o:p></o:p>

wyj7485 发表于 2006-7-10 16:54:00

1,AcadEntity即object
2,对，高亮显示
3,vbInformation在msgbox下可以察看许多这样的vb变量
4,对

efan2000 发表于 2006-7-16 23:18:00

1、ObjectID是对象ID，在当前的整个AutoCAD应用程序内是唯一的。Handle是对象句柄，仅在一个文档内是唯一的。
2、AcadEntity是图元对象的基类，只限于有图形的对象使用。AcadObject是所有对象的基类，可以用于非图形对象，如层，文字样式等。
3、vbInformation是用于MsgBox中，代表弹出的是信息提示框，还可以是警告、疑问之类的。

页: [1]

明经CAD社区's Archiver

14.5 数据记录和AutoCAD实体的对应(VBA 二次开发教程)