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[求助] CAD2017样条曲线怎么转换成圆

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发表于 2024-3-17 19:49:15 | 显示全部楼层
VBA可以

  1. Public Sub ConvertSplineToArcs()
  2.     Dim spline As AcadSpline
  3.     Dim i As Integer
  4.     Dim points As Variant
  5.     Dim startPoint As Variant
  6.     Dim midPoint As Variant
  7.     Dim endPoint As Variant
  8.     Dim radius As Double
  9.     Dim centerPoint As Variant
  10.    
  11.     ' 确保至少选中了一条样条线
  12.     If ThisDrawing.SelectionSets.Count = 0 Then Exit Sub
  13.     Set ss = ThisDrawing.SelectionSets.Item("WindowsSelectionSet")
  14.     If Not ss.Count >= 1 Then Exit Sub
  15.     Set ent = ss.Item(0).Entities.Item(0)
  16.     If Not TypeOf ent Is AcadSpline Then Exit Sub
  17.     Set spline = ent
  18.    
  19.     ' 获取样条线的控制点
  20.     points = spline.GetControlPoints
  21.    
  22.     ' 循环遍历每个定点对,并创建圆弧
  23.     For i = 0 To UBound(points) - 2 Step 3
  24.         startPoint = points(i)
  25.         midPoint = points(i + 1)
  26.         endPoint = points(i + 2)
  27.         
  28.         ' 计算圆弧的半径和中心点
  29.         radius = Distance(startPoint, midPoint)
  30.         centerPoint = MidPoint(startPoint, midPoint)
  31.         
  32.         ' 创建圆弧
  33.         Dim startAngle As Double
  34.         Dim endAngle As Double
  35.         ' 计算起始角度和结束角度
  36.         ' 这里需要根据实际情况进行计算
  37.         startAngle = AngleBetween(centerPoint, startPoint)
  38.         endAngle = AngleBetween(centerPoint, endPoint)
  39.         
  40.         ' 创建圆弧
  41.         Dim arc As AcadEntity
  42.         Set arc = ThisDrawing.ModelSpace.AddArc(centerPoint(0), centerPoint(1), centerPoint(2), radius, radius, startAngle, endAngle)
  43.     Next i
  44. End Sub

  45. ' 计算两点之间的距离
  46. Function Distance(pt1 As Variant, pt2 As Variant) As Double
  47.     Distance = Sqr((pt1(0) - pt2(0)) ^ 2 + (pt1(1) - pt2(1)) ^ 2)
  48. End Function

  49. ' 计算两点之间的中点
  50. Function MidPoint(pt1 As Variant, pt2 As Variant) As Variant
  51.     MidPoint = Array((pt1(0) + pt2(0)) / 2, (pt1(1) + pt2(1)) / 2, (pt1(2) + pt2(2)) / 2)
  52. End Function

  53. ' 计算两向量之间的角度
  54. Function AngleBetween(centerPoint As Variant, otherPoint As Variant) As Double
  55.     Dim vecX As Double
  56.     Dim vecY As Double
  57.     vecX = otherPoint(0) - centerPoint(0)
  58.     vecY = otherPoint(1) - centerPoint(1)
  59.     ' 计算角度的代码需要根据实际情况进行编写
  60.     ' 这里是一个简化的示例
  61.     AngleBetween = Atn2(vecY, vecX) * 180 / 4.14159265358979
  62. End Function
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