Get group location over Ruby Script

Ossi01

Hello everybody,

can somebody explain me, how i get the location of a group(In Sketchup.active_model) over a ruby script ? Currently, i get only the local position of the entities in the group(groups have a own axis of abscissas), but i need the global position. I hope, you-all understand my problem

Cu
Ossi01

thomthom

Is the group in the active context? ( model.active_entities ? )
How are you obtaining the group?

Ossi01

@ thomthom : Yes, the group is in model.active_entites and i obtaining the group. This isn't my Problem. But i get over Sketchup.active_model.active_entities[0].entities[1].end.position or Sketchup.active_model.active_entities[0].entities[1].start.position the local position of a edge(Start- and End-Vertex) in the group , not the global position in the whole model ! But i need the global position

TIG

Try tr=group.transformation to get the group's current position and then when you get the contents points transform! them by 'tr' - e.g. pt.transform!(tr)
If the group is not within the model.entities (as in group.parent != model) you need to recursively apply the parent's parent's transformations until it is etc... using a while parent != model ... end loop ?

thomthom

@ossi01 said:

@ thomthom : Yes, the group is in model.active_entites and i obtaining the group. This isn't my Problem. But i get over Sketchup.active_model.active_entities[0].entities[1].end.position or Sketchup.active_model.active_entities[0].entities[1].start.position the local position of a edge(Start- and End-Vertex) in the group , not the global position in the whole model ! But i need the global position

Ok - assume you have an edge in group in the current context - the group is selected


model = Sketchup.active_model
sel = model.selection

group = sel[0]
edge = group.entities[0] # Assuming there is only one edge in the group

global_start = edge.start.position.transform( group.transformation )

Not that when you open a group or component for editing, the co-ordinates you get in active_entities are the global ones.

thomthom

@tig said:

If the group is not within the model.entities (as in group.parent != model) you need to recursively apply the parent's parent's transformations until it is etc... using a while parent != model ... end loop ?

As long as the group is within model.active_entities one only need to apply the group's transformation.
And you can't go backwards by parent as you traverse definitions instead if instances.

Ossi01

big thanks @ TIG and thomthom. It works !!

honoluludesktop

Isn't this ("the location of a group") what Ossi01's asking? The example uses selection to Id a group, then gets its transformation, then its origin based on its location from the model's origin.

model = Sketchup.active_model
my_selection = model.selection
	
my_selection.each do |ent|
  if ent.is_a? Sketchup;;Group
     t=ent.transformation
     puts t.origin.to_a
  end
end

TIG

When you get the position of a point [ pt] in a group.entities [or definition's] it is relative to where it was 'made' i.e. for a model it's bounds.min is typically taken as the model.origin. So the point is returned relative to the group's coordinate system not the model's. You can apply the tr=group.transformation to that point pt.transform!(tr) and it is now given in the model's coordinate system... If groups are nested then the transformation of each parent back to the model level has to be taken into consideration...

HerveRenault

@tig said:

tr=group.transformation to that point pt.transform!(tr)

Thank you very much for the tip !