How to attach text to a line

[penpendrum]

I want to attach a text to a line and the text would follow the line even if I move or rotate it.
I also want the text to become smaller when I zoom out if this is possible. .
I it also possible for the text not to follow the camera angle?
I know that this is easy if we will just click the text button and then click on the line.

but how do I do this with ruby scripts?

I tried to write this script but this does not seem to give me my desired result:

here is my ruby script:

model = Sketchup.active_model
entities = model.entities
selection = model.selection

A = entities[0].end.position

B = entities[0].start.position

coordinates = [(A.x+B.x)/2,(A.y+B.y)/2,(A.z+B.z)/2]
point = Geom::Point3d.new coordinates
text = entities.add_text "Tae", point,[0,2,5]

     text.display_leader= false

please bare with me I am just a newbie ruby programmer:

[Dan Rathbun]

(1) Do not use capital letters for variables. A and B become constants which are also class and module names.

(2) code within your own unique namespace module, and separate your various plugins into sub-modules.

module Penpendrum
  module TextWizard

    # code goes in here

  end # sub-module
end # module

(3) Create an empty group
grp = entities.add_group

(4) Add your edge and text into the group's entities
grp.entities.add_line(start,end)
Then calc the midpoint coordinates

(5) use 3Dtext instead of a text callout
text = grp.entities.add_group text.entities.add_3d_text("Tae",TextAlignCenter,"Arial",true, false, 1.0) text.transform!(coordinates)

Your object is a group with an edge, and a 3d text sub-group (with the 3D text primitives inside it.)

[penpendrum]

I'm sorry I have tried that .. but that is not what is in my mind.. I just want the text to follow the line even if I move one point only . . doing this manually is possible.. but not for ruby scripts I think..