Curve On Surface with rebuild (how to solve preview interruption?)[solved]

@Gijs wrote:

as an exercise, I've made a curve on surface script that rebuilds the curve while drawing, and gives the user the option to change number of points during the command.
I've taken the approach to add an empty point to the picked points that gets overriden by the dynamicdraw function CurrentPoint. Everything seems to work except I can't solve the issue that stops the dynamic draw from drawing the curve as soon as the CurrentPoint is equal to the last picked point.
I was able to solve the issue for the 'baked curve' by testing the last point to the previous point and remove it, but for the dynamic draw routine, I can't figure out how to do that. Any pointers?

the script:

import Rhino
import rhinoscriptsyntax as rs
from System.Drawing import Color
import scriptcontext as sc

def DynamicCrvOnSrf():
    
    def drawMyCurve(sender,e):
        points[-1]=e.CurrentPoint#change last point to CurrentPoint
        curve=rhsrf.InterpolatedCurveOnSurface(points,0.01)
        nc = curve.ToNurbsCurve()
        ptCount=optInt.CurrentValue
        nc=nc.Rebuild(ptCount,3, True)
        ncpoints = [nc.Points[i].Location for i in xrange(nc.Points.Count)]
        e.Display.DrawCurve(nc, Color.LightCyan,2)
        e.Display.DrawPoints(ncpoints,Rhino.Display.PointStyle.Simple,5,Color.Cyan)
        e.Display.DrawPoints(points,Rhino.Display.PointStyle.X,1,Color.Blue)

    def getPoint():
        while True:
            result = gp.Get()
            if result == Rhino.Input.GetResult.Point:
                gp.SetCommandPrompt("Next point")
                pt=gp.Point()
                newpoint=rs.AddPoint(pt)
                snapPoints.append(newpoint)
                #append first picked point
                if points==[]:
                    points.append(pt)
                #check if next picked point is same as previous
                if len(points)>1:
                    a=round(points[-1].X,2)
                    b=round(points[-2].X,2)
                    if a==b:
                        del points[-1]
                #add empty point to list
                #will get assigned in drawMyCurve()
                points.append(Rhino.Geometry.Point3d)
                gp.DynamicDraw+=drawMyCurve
                #recursion: getpoint calling itself if a point has been picked:
                getPoint()
            elif result == Rhino.Input.GetResult.Option:
                #go back to point selection mode
                getPoint()
            elif result == Rhino.Input.GetResult.Undo:
                del points[-2]
                rs.DeleteObject(snapPoints[-1])
                getPoint()
            #pressing spacebar, enter
            elif result == Rhino.Input.GetResult.Nothing and len(points)>2:#2 picked points +1 temporary point
                #remove last added preview point
                del points[-1]
                ptCount=optInt.CurrentValue
                rs.DeleteObjects(snapPoints)
                newcrv=rs.AddInterpCrvOnSrf(srf, points)
                rs.RebuildCurve(newcrv,3,ptCount)    
                sc.doc.Views.Redraw()
            #pressing esc
            else:
                rs.DeleteObjects(snapPoints)
            break

    srf=rs.GetObject("Select surface to draw curve on", rs.filter.surface)
    if srf==None:
        return
    rhsrf=rs.coercesurface(srf)
    gp=Rhino.Input.Custom.GetPoint()
    gp.SetCommandPrompt("Start of Curve")
    gp.Constrain(rhsrf, False)
    gp.AcceptNothing(True)
    gp.AcceptUndo(True)
    Rhino.ApplicationSettings.SmartTrackSettings.UseSmartTrack=False
    points=[]
    snapPoints=[]
    optInt=Rhino.Input.Custom.OptionInteger(20,4,100)
    gp.AddOptionInteger("ptCount",optInt)
    getPoint()

if( __name__ == "__main__" ):
    DynamicCrvOnSrf()

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