Summary: Demonstrates how to find the closest curve to test point using RhinoScript.

The following RhinoScript sample demonstrates how to find the closest curve to test point using RhinoScript.

 Sub FindClosestCurve
 
   Const rhPoint = 1
   Const rhCurve = 4
 
   'Dim arrCurves : arrCurves = Rhino.ObjectsByType(rhCurve)
   Dim arrCurves: arrCurves = Rhino.GetObjects("Select curves to test", rhCurve)
   If Not IsArray(arrCurves) Then Exit Sub
 
   Dim strPoint : strPoint = Rhino.GetObject("Select test point", rhPoint)
   If IsNull(strPoint) Then Exit Sub
 
   Dim arrPoint : arrPoint = Rhino.PointCoordinates(strPoint)
 
   Dim dblDistance : dblDistance = Null
   Dim strCurve : strCurve = Null
   Dim dblParameter : dblParameter = Null
   Dim arrPt : arrPt = Null
 
   Dim i, b, t, pt, d
   For i = 0 To UBound(arrCurves)
     b = vbFalse
     t = Rhino.CurveClosestPoint( arrCurves(i), arrPoint )
     If Not IsNull(t) Then
       pt = Rhino.EvaluateCurve( arrCurves(i), t )
       If IsArray(pt) Then
         d = Rhino.Distance(pt, arrPoint)
         If IsNull(dblDistance) Then
           b = vbTrue
         ElseIf (d < dblDistance) Then
           b = vbTrue
         End If
 
         If (b = vbTrue) Then
           dblDistance = d
           strCurve = arrCurves(i)
           dblParameter = t
           arrPt = pt
         End If
       End If
     End If
   Next
 
   If Not IsNull(dblDistance) Then
     Rhino.Print "Closest curve = " & CStr(strCurve)
     Rhino.Print "Curve parameter = " & CStr(dblParameter)
     Rhino.Print "Point = " & Rhino.Pt2Str(arrPt)
     Rhino.Print "Distance = " & CStr(dblDistance)
 
     Rhino.SelectObject strCurve
     Rhino.SelectObject Rhino.AddPoint(arrPt)
   End If
 
 End Sub