两维变三维的问题
目标：把建筑立面图转到各个平面上，然后组成简单的3维图。过程：
1。先分析立面图所用的画图命令，然后针对各命令作旋转处理。
2。最简单的是画线命令，取得线的起终点，旋转坐标后，更新线的坐标就可以了。
3。对其他画图命令，因为只在xy平面上画图，取得参数坐标后，先要用ucs命令转到对应平面，再画图。还要删除原来的图。
下面是一个转弧的例子。
生成弧的例程：
Sub Example_AddArc()
' This example creates an arc in model space.
Dim arcObj As AcadArc
Dim centerPoint(0 To 2) As Double
Dim radius As Double
Dim startAngleInDegree As Double
Dim endAngleInDegree As Double
' Define the circle
centerPoint(0) = 0#: centerPoint(1) = 0#: centerPoint(2) = 0#
radius = 5#
startAngleInDegree = 0#
endAngleInDegree = 180#
' Convert the angles in degrees to angles in radians
Dim startAngleInRadian As Double
Dim endAngleInRadian As Double
startAngleInRadian = startAngleInDegree * 3.141592 / 180#
endAngleInRadian = endAngleInDegree * 3.141592 / 180#
' Create the arc object in model space
Set arcObj = ThisDrawing.ModelSpace.AddArc(centerPoint, radius, startAngleInRadian, endAngleInRadian)
ZoomAll
End Sub
转弧的例程：
Sub myrotatearc()
Dim newObjs As AcadArc
Dim centerPoint(0 To 2) As Double
Dim radius As Double
Dim startAngleInDegree As Double
Dim endAngleInDegree As Double
Dim startAngleInRadian As Double
Dim endAngleInRadian As Double
Dim i, n As Long
n = ThisDrawing.ModelSpace.Count
For i = 0 To n - 1
'AcDbArc
If ThisDrawing.ModelSpace.Item(i).ObjectName = "AcDbArc" Then
Set newObjs = ThisDrawing.ModelSpace.Item(i)
centerPoint(0) = newObjs.Center(0)
centerPoint(1) = newObjs.Center(1)
centerPoint(2) = newObjs.Center(2)
radius = newObjs.radius
startAngleInRadian = newObjs.StartAngle
endAngleInRadian = newObjs.EndAngle
ThisDrawing.SendCommand "_Ucs" & vbCr & "y" & vbCr & "90" & vbCr'绕y轴转90度
Set arcObj = ThisDrawing.ModelSpace.AddArc(centerPoint, radius, startAngleInRadian - 3.1415926 / 2#, endAngleInRadian - 3.1415926 / 2#)'注意这里减了90度，可能是因为上面ucs命令转了90度
ThisDrawing.SendCommand "_Ucs" & vbCr & "y" & vbCr & "-90" & vbCr '把画图平面转回来
newObjs.Delete'删除原来的弧
End If
Next i
ZoomAll
ThisDrawing.Regen acAllViewports
MsgBox "Good on ya!"
End Sub
学习了
用rotate3d更简单。 用对齐命令更简单。
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