Rotating faces to create a u-shape

j_jones

Hello again, I am just learning the Ruby API and am back with another simpler question.

My goal is to draw a face in an arbitrary point in space (not at the origin). Then I want to copy the face and rotate it 90 degrees to create a corner shape. Then copy the second face and rotate it 90 degrees to create a u-shape

This is the code I came up with to do this, however, I'm running into a problem in that I can't seem to access the points of the rotated face. The positions of the points are identical the ones in the original face for some reason.

Here is the script.

By the way, I must be doing something really weird because when I run this script in
Ruby Console Plus, it freezes and then goes blank. I haven't had any trouble with the
console until I ran this script!



model = Sketcup.active_model
active_entities = model.active_entities

# draw first face

#     p3         p2 
#      +---------+
#      |         |
#      |         |
#      |         |
#      |         |
#      +---------+
#     p0         p1

model.start_operation("first face",true,false,true)

pts = [[10,10,0], [20,10,0], [20,10,10], [10,10,10]]
pt0, pt1, pt2, pt3 = pts
group1 = active_entities.add_group
g1_entities = group1.entities
face1 = g1_entities.add_face(pts)

# print out the vertexes of the first face
puts("first group")
group1.entities.each do |thing|
   if thing.is_a?(Sketchup;;Edge)
     puts "#{thing.start.position} #{thing.end.position}"
   end
end

# end of first face
model.commit_operation

So far so good, here is the face, ready to go

first face

Now on to the second face



model.start_operation("second face",true,false,true)

# make a copy of the first face
# then rotate it to create a corner shape

#            pt0 
#             +---------+
#            /|         |
#           / |         |
#          /  |         |
#         +   |         |
#         |   +---------+
#         |  /pt3
#         | /
#         |/
#         +  

group2 = group1.copy
g2_entities = group2.entities

axis = pt0.vector_to(pt3)
angle = -90.degrees
xform = Geom;;Transformation.rotation(pt0, axis, angle)
group2.transform!(xform)

# notice that the points of the group2 face have not been rotated
#   they still reflect the points of the first face
puts("second group")
group2.entities.each do |thing|
   puts thing
   if thing.is_a?(Sketchup;;Edge)
     puts "#{thing.start.position} #{thing.end.position}"
   end
end
# end of second face

model.commit_operation

Second face rotated, looks good except if I query the second face for the
positions of its vertices, it just reports the same positions as the first face

second face

BTW, at this point Ruby Console Plus tends to freeze and then ultimately goes blank and has to be restarted. I have no idea why.

At this point I would like to rotate the second face to create a u-shape, but
I don't know what points to pick because the points given don't reflect the rotation



model.start_operation("third face",true,false,true)

# make a copy of the second face
# then rotate it to create a u-shape
group3 = group2.copy
g3_entities = group3.entities

#         goal 
#             +---------+
#            /|         |
#           / |         |
#          /  |         |
#         +---------+   |
#         |   +-----|---+
#         |  /      |
#         | /       |
#         |/        |
#         +---------+  

# at this point I don't really know which points to choose to create
# the axis for rotating the third face as I don't seem to be able
# to access the rotated shape's actual points?

puts("third group")
group3.entities.each do |thing|
   puts thing
   if thing.is_a?(Sketchup;;Edge)
     puts "#{thing.start.position} #{thing.end.position}"
   end
end
# end of third face

# model.commit_operation

Thanks for any clues
j_jones