Ruby API - add dimensions between circle centers

Developers Ruby API
,
1

I am trying to create a linear dimension between centers of 2 circles using this API:

Sketchup.active_model.active_entities.add_dimension_linear([c1p, c1.entity.center], [c2p, c2.entity.center], vector)

where
c1.entity and c2.entity - are an Sketchup::ArcCurve
c1p and c2p are paths, that consist of [#<Sketchup::Group:..>, #<Sketchup::ArcCurve:..>]

This produces an error:

Error: #<TypeError: Invalid start instance path leaf entity. Must be Sketchup::ConstructionPoint, Sketchup::ConstructionLine, Sketchup::Vertex, or Sketchup::Edge.>

At the same time, if I create two circles in a group and make dimension using UI, like this:

image
image252×173 1.29 KB

And then, in Ruby code I get that dimension and check start/end attached points, I get the same path, i.e. vo.entity is DimensionLinear
using this code:

puts "#{vo.entity}"
print_se_points(vo.entity.start_attached_to)
print_se_points(vo.entity.end_attached_to)
...
 def self.print_se_points(attached_to)
      puts "attached_to path #{attached_to[0]}, point: #{attached_to[1]}"
      puts "attached_to path leaf #{attached_to[0].leaf}, point: #{attached_to[1]}"
      puts "path: #{attached_to[0].to_a}"
end

then I see this:

#<Sketchup::DimensionLinear:0x000002f6791e9890>
attached_to path #<Sketchup::InstancePath:0x000002f603243898>, point: (68.813824 mm, 20.726349 mm, 0 mm)
path: [#<Sketchup::Group:0x000002f6027c7108>, #<Sketchup::ArcCurve:0x000002f6760e7be8>]
attached_to path leaf #<Sketchup::ArcCurve:0x000002f6760e6f68>, point: (12 mm, 10.574009 mm, 0 mm)

attached_to path #<Sketchup::InstancePath:0x000002f603242150>, point: (12 mm, 34.574009 mm, 0 mm)
path: [#<Sketchup::Group:0x000002f6027c7108>, #<Sketchup::ArcCurve:0x000002f6760e6f68>]
attached_to path leaf #<Sketchup::ArcCurve:0x000002f6760e6f68>, point: (12 mm, 34.574009 mm, 0 mm)

i.e. leaf of a path is ArcCurve and there is no problem that it is attached to dimension start/end

This confuses me - what am I doing wrong?
What is a proper way to create a dimension programmatically to a center of circle?
Should I just create a cpoint at the center of circle and add it as a leaf in a path?

UPDATE:
Creating a cpoint actually did not work either:

      c1p = c1.instance_path
      np = c1p.to_a + [active_entities.add_cpoint(c1c)]
      puts "#{np}"
      c1p = Sketchup::InstancePath.new(np)

,
Gives an error on last line:

#<Sketchup::Group:...>, #<Sketchup::ArcCurve:...>, #<Sketchup::ConstructionPoint:...>
Error: #<ArgumentError: invalid instance path>

UPDATE 2

Figured the error with my approach with cpoint - instead of adding another element to a path, i should have replaced the last element, because the construction point is “within” a group, not “within” a circle. That was an improvement, but then I realized that this approach with cpoint will not work, since this cpoint is not related to a circle, and if circle is moved or resized - cpoint will stay where it is.. therefore I consider this approach wrong. That means i’m back where I started …