使用SOLIDWORKS API将实体切片为多个截面
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该示例演示了如何使用SOLIDWORKS API将选定的实体切片,并使用SOLIDWORKS API获取切片的截面属性。
- 在SLICES_COUNT常量中指定所需切片的数量
Const SLICES_COUNT As Integer = 100
- 在零件文档中选择实体
- 结果如下:
- 实体在Y方向上被切片
- 每个切片的面积将输出到VBA编辑器的即时窗口
- 每个切片的预览将显示在图形区域中
- 继续运行宏以隐藏预览
算法
确定实体的起始点和最大长度
- 找到方向向量(本示例中为Y向量)的正方向和负方向上的2个极点
- 将这些点投影到方向向量线上(向量可以固定在任何点上,在本示例中固定在0, 0, 0)
- 一旦投影完成,计算两点之间的距离 - 这将等于实体的最大长度
- 第一个极点是起始点
确定实体的最大半径
只需要找到足够大的半径以覆盖实体。该半径将用于创建用于相交的平面实体。在本示例中,最大半径等于包围盒的对角线长度,这将确保平面截面将覆盖输入实体。
计算截面
- 计算截面的步长
- 对于每个截面,将起始点按步长移动。端点处的截面应该被跳过,因为它不会产生任何相交结果
- 在每个步长处创建一个临时截面平面(圆盘),并将其与实体相交
- 相交的结果是该位置的截面切片的片体(或片体)
- 将截面的指针存储在集合中
- 所有属性都可以从结果体中访问(例如,表面积)
预览结果
- 将每个结果体显示为预览
- 停止宏的执行以验证结果
- 可能需要隐藏或更改原始实体的透明度以查看显示的截面
- 继续宏的执行。这将清除预览
Const SLICES_COUNT As Integer = 100
Dim swApp As SldWorks.SldWorks
Sub main()
Set swApp = Application.SldWorks
Dim swModel As SldWorks.ModelDoc2
Set swModel = swApp.ActiveDoc
If Not swModel Is Nothing Then
Dim swBody As SldWorks.Body2
Set swBody = swModel.SelectionManager.GetSelectedObject6(1, -1)
If Not swBody Is Nothing Then
Dim startTime As Double
startTime = Timer
Dim swSliceBodies As Collection
Set swSliceBodies = New Collection
Dim maxRadius As Double
maxRadius = GetMaxRadius(swBody)
Dim i As Integer
Dim dNorm(2) As Double
Dim dRef(2) As Double
dNorm(0) = 0: dNorm(1) = 1: dNorm(2) = 0
dRef(0) = 1: dRef(1) = 0: dRef(2) = 0
Dim vStartPt As Variant
Dim length As Double
vStartPt = GetStartPoint(swBody, dNorm, length)
Dim step As Double
step = length / (SLICES_COUNT + 1)
For i = 1 To (SLICES_COUNT + 1) - 1
Dim swCutPlane As SldWorks.Body2
Dim vRoot As Variant
vRoot = MovePoint(vStartPt, dNorm, step * i)
Set swCutPlane = CreatePlanarBody(vRoot, dNorm, dRef, maxRadius)
Dim swTempBody As SldWorks.Body2
Set swTempBody = swBody.Copy
Dim bodyErr As Long
Dim vRes As Variant
vRes = swCutPlane.Operations2(swBodyOperationType_e.SWBODYINTERSECT, swTempBody, bodyErr)
Dim j As Integer
If Not IsEmpty(vRes) Then
For j = 0 To UBound(vRes)
Dim swResBody As SldWorks.Body2
Set swResBody = vRes(j)
Debug.Print "Area: " & swResBody.GetMassProperties(0)(4)
swSliceBodies.Add swResBody
Next
Else
err.Raise vbError, , "Intersection failed"
End If
Next
Debug.Print "Time: " & Round(Timer - startTime, 2)
For i = 1 To swSliceBodies.Count
swSliceBodies(i).Display3 swModel, RGB(255, 255, 0), swTempBodySelectOptions_e.swTempBodySelectOptionNone
Next
Stop
For i = swSliceBodies.Count To 1 Step -1
swSliceBodies.Remove i
Next
Else
MsgBox "Please select body"
End If
Else
MsgBox "Please open model"
End If
End Sub
Function GetMaxRadius(body As SldWorks.Body2) As Double
Dim vBox As Variant
vBox = body.GetBodyBox()
GetMaxRadius = Sqrt((vBox(3) - vBox(0)) ^ 2 + (vBox(4) - vBox(1)) ^ 2 + (vBox(5) - vBox(2)) ^ 2)
End Function
Function GetStartPoint(body As SldWorks.Body2, vDir As Variant, ByRef length As Double) As Variant
Dim x As Double
Dim y As Double
Dim z As Double
body.GetExtremePoint CDbl(-vDir(0)), CDbl(-vDir(1)), CDbl(-vDir(2)), x, y, z
Dim dPt(2) As Double
dPt(0) = x: dPt(1) = y: dPt(2) = z
GetStartPoint = dPt
body.GetExtremePoint CDbl(vDir(0)), CDbl(vDir(1)), CDbl(vDir(2)), x, y, z
dPt(0) = x: dPt(1) = y: dPt(2) = z
Dim dVecPt(2) As Double
Dim vPt1 As Variant
Dim vPt2 As Variant
vPt1 = ProjectPointOnVector(GetStartPoint, vDir, dVecPt)
vPt2 = ProjectPointOnVector(dPt, vDir, dVecPt)
length = Sqrt((vPt1(0) - vPt2(0)) ^ 2 + (vPt1(1) - vPt2(1)) ^ 2 + (vPt1(2) - vPt2(2)) ^ 2)
End Function
Function ProjectPointOnVector(vPt As Variant, vVec As Variant, vPtOnVec As Variant) As Variant
Dim swMathUtils As SldWorks.MathUtility
Set swMathUtils = swApp.GetMathUtility
Dim swPt As SldWorks.MathPoint
Dim swVec As SldWorks.MathVector
Dim swPtOnVec As SldWorks.MathPoint
Set swPt = swMathUtils.CreatePoint(vPt)
Set swVec = swMathUtils.CreateVector(vVec)
Set swPtOnVec = swMathUtils.CreatePoint(vPtOnVec)
Dim swVec2 As SldWorks.MathVector
Set swVec2 = swPtOnVec.Subtract(swPt)
Dim magn As Double
Dim prod As Double
Dim dist As Double
prod = swVec.Dot(swVec2)
magn = swVec.GetLength() ^ 2
dist = prod / magn
Dim swDestPt As SldWorks.MathPoint
Set swDestPt = swPtOnVec.AddVector(swVec.Scale(dist))
ProjectPointOnVector = swDestPt.ArrayData
End Function
Function CreatePlanarBody(vRoot As Variant, vNorm As Variant, vRef As Variant, radius As Double) As SldWorks.Body2
Dim swModeler As SldWorks.Modeler
Set swModeler = swApp.GetModeler
Dim swSurf As SldWorks.Surface
Set swSurf = swModeler.CreatePlanarSurface2(vRoot, vNorm, vRef)
Dim swTrimCurve(0) As SldWorks.Curve
Dim vArcPt As Variant
vArcPt = MovePoint(vRoot, vRef, radius)
Set swTrimCurve(0) = swModeler.CreateArc(vRoot, vNorm, radius, vArcPt, vArcPt)
Set CreatePlanarBody = swSurf.CreateTrimmedSheet4(swTrimCurve, True)
End Function
Function MovePoint(vPt As Variant, vDir As Variant, dist As Double) As Variant
Dim swMathUtils As SldWorks.MathUtility
Set swMathUtils = swApp.GetMathUtility
Dim swPt As SldWorks.MathPoint
Dim swDir As SldWorks.MathVector
Set swPt = swMathUtils.CreatePoint(vPt)
Set swDir = swMathUtils.CreateVector(vDir)
Set swDir = swDir.Normalise()
Set swDir = swDir.Scale(dist)
Set swPt = swPt.AddVector(swDir)
MovePoint = swPt.ArrayData
End Function