Problem with PointStyle when using DrawPoint()

Rhino Developer
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1

Hi guys, I`m trying to learn how to use display conduit, and write a script to display a point in view.

import Rhino
import System.Drawing
import scriptcontext
import rhinoscriptsyntax as rs

class PointConduit(Rhino.Display.DisplayConduit):
    def __init__(self, pt):
        self.pt = pt
        print "conduit pt initialized"
    
    def DrawForeground(self, e):
   
        Pointstyle = 0
        print "set ps"
        radius = 15
        print "set radius"
        color =  System.Drawing.Color.Red
        print "set color"
        e.Display.DrawPoint(self.pt, Pointstyle, radius, color)
        print "draw dot"

def RunCommand():
    
    Point = Rhino.Geometry.Point3d(0,0,0)
    print Point
    
    conduit = PointConduit(Point)
    
    conduit.Enabled = True
    print "conduit enabled"
    scriptcontext.doc.Views.Redraw()
    rs.GetString("Pausing for user input")
    conduit.Enabled = False
    scriptcontext.doc.Views.Redraw()
    
    return Rhino.Commands.Result.Success
    
if __name__=="__main__":
    RunCommand()

This script works as I expected, but I then notice that when I change point style to other styles like 1(represent for ControlPoint),2(ActivePoint) and so on, the script stops display the point in view.

I`d like to ask what reason causes this problem? or is my understanding of point style wrong?

2

The style input to Rhino.Display.DrawPoint(..) expects an instance of the Rhino.Display.PointStyle enum.

Something like this should work:

class PointConduit(Rhino.Display.DisplayConduit):
    def __init__(self, pt):
        self.pt = pt
    
    def DrawForeground(self, e):
        style = Rhino.Display.PointStyle.X
        radius = 15
        color =  System.Drawing.Color.Red
        e.Display.DrawPoint(self.pt, style, radius, color)
4

Hi Pierre,

Thanks a lot for reply, it does work. Now I know how to use it, but allow me to ask furthermore.
In my original script, why does “pointstyle = 0” work? Does it mean setting pointstyle to default style?

5

Yes, zero is a default. This link is C# but I think it’s a .NET standard.

Enumeration types - C# reference - C# | Microsoft Learn

The default value of an enumeration type E is the value produced by expression (E)0 , even if zero doesn’t have the corresponding enum member.

6

Thanks Nathan, Seems like I need to learn C# after all.