rs.LInearDimension bug or my fault?

[vittorio]

Hi Steve
With this script I expect the result of attached picture LinearDimension_2 and not LinearDimension_1;
It's a bug or my fault?

Python Code:

import rhinoscriptsyntax as rs
p1=(-30,0,0)
p3=(120,50,0)
p4=(0,100,0)
px=(60,120,0)
py=(-50,50,0)
rs.AddLinearDimension(p3,p4,px)
rs.AddLinearDimension(p1,p4,py)

Ciao Vittorio

[Mitch]

Ciao Vittorio,
Yes, this does seem to be buggy. As a matter of fact, rs.AddLinearDimension seems to be lacking two arguments that its vb counterpart has - a plane and also the dimension style.
In testing, the plane argument is important, as the aligned dimension appears to always follow the X axis vector of the plane, and by default the World X axis. Have a look at the following vbRhinoscript:

vb Code:

Option Explicit
Call TestAddDim()
Sub TestAddDim()
    Dim p1,p3,p4,px,py,plane
    p1 = Array(-30,0, 0)
    p3 = Array(120,50, 0)
    p4 = Array(0,100, 0)
    px = Array(60,120, 0)
    py = Array(-50,50, 0)
    plane = Rhino.WorldXYPlane 
    Call Rhino.AddLinearDimension(plane,p3,p4,px)
    plane = Rhino.RotatePlane(plane, 90, Array(0, 0, 1))
    Call Rhino.AddLinearDimension(plane, p1, p4, py)
End Sub

Note that I had to rotate the plane 90° to get the second dimension right (try commenting that line out).
Although in RhinoCommon the class Rhino.Geometry.LinearDimension has a plane argument, I don't see a method that uses the plane. The method called by rs.AddLinearDimension - Rhino.Geometry.LinearDimension.FromPoints(start, end, onpoint) does not have a plane argument...

Also Steve, the Python Help page for Dimensions is missing both AddLinear and AddAligned methods (their individual pages exist and can be accessed from the tree view though)
Cheers, --Mitch