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' ArcPointDistribution.rvb -- February 2009
' If this code works, it was written by Dale Fugier.
' If not, I don't know who wrote it.
' Works with Rhino 4.0.
Option Explicit
Sub ArcPointDistribution
' Local variables
Dim arc, cnt, rads
Dim n_t(), n, i, a0, a1
Dim line, dom, t
' Select arc curve
arc = Rhino.GetObject("Select arc", 4)
If IsNull(arc) Then Exit Sub
If Not Rhino.IsArc(arc) Then Exit Sub
' Get number of points to calculate
cnt = Rhino.GetInteger("Number of points", 2)
If IsNull(cnt) Then Exit Sub
rads = Rhino.ToRadians(Rhino.ArcAngle(arc))
n = cnt - 1
ReDim n_t(n)
' Calculate normalized parameters
For i = 0 To n
a0 = Sin(rads/2)
a1 = Sin(i*rads/n - rads/2)
n_t(i) = (a0+a1)/(2*a0)
Rhino.EnableRedraw False
line = Rhino.AddLine(Rhino.CurveStartPoint(arc), Rhino.CurveEndPoint(arc))
dom = Rhino.CurveDomain(line)
For i = 0 To n
' Convert normalized parameter to domain value
t = (1.0 - n_t(i)) * dom(0) + n_t(i) * dom(1)
Rhino.AddPoint Rhino.EvaluateCurve(line, t)
'Rhino.DeleteObject line
Rhino.EnableRedraw True
End Sub
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