Axes vectors in Sketchup 8

[Deanby7]

I want to offset points along the x, y and z axes and want to setup vector variables. The following doesn't work in Sketchup 8.

xa, ya, za = Sketchup.active_model.axes.axes

The Ruby API shows 2016+ in the reference document.
Is there another way of doing this?

[TIG]

SketchUp comes with several built in Constants

ORIGIN X_AXIS Y_AXIS Z_AXIS

which are, in effect...

[0,0,0] [1,0,0] [0,1,0] [0,0,1]

I think you are over thinking this...

[Deanby7]

Trying to follow your example from the holeinthewall!!
I seem to get hung up on the simplest of things!! I am getting Error: #<ArgumentError: wrong number of values in array> between p "ok" and p "ok2" lines of code!! Grrrrrr

module DeanBy7
	module Stair_Builder
		def self.main
		    @tht = 2600.mm if(!@tht)
			@wid = 900.mm if(!@wid)
			@trd = 32.mm if(!@trd)
			org = [0,0,0]
			mod = Sketchup.active_model			
			xa = X_AXIS
			ya = Y_AXIS
			za = Z_AXIS
			ents = mod.entities
			str_grp = ents.add_group()
			str_grp.name = "dbStairs"
			sents = str_grp.entities
			prompts = ["Stair Height Total", "Stair Width", "Tread Thickness"]
			results = UI.inputbox prompts, [@tht,@wid,@trd], "db Stair Builder"
				if results
					@tht,@wid,@trd = results; mod.start_operation "db Window Opening"
					p @tht
					p @wid
			        testrisers = @tht / 220.mm
					risers = testrisers.ceil
                    p testrisers
                    p risers
                    riser = @tht / risers
					p "Riser = " + riser.to_mm.to_s
					tread = riser / Math.tan(42.degrees)
					p "Tread = " + tread.to_mm.to_s
					p0 = [org]
					p "ok"
					p1 = p0.offset(xa, @wid)
					p "ok2"
					p2 = p1.offset(ya, tread)
					p3 = p0.offset(ya, tread)
					step = sents.add_face(p0,p1,p2,p3)
					step.pushpull @trd
					
					mod.commit_operation
			    end
		end
	end
end
unless file_loaded?("dbstairbuilder")
	UI.menu("Plugins").add_item("db Stair Builder") { DeanBy7;;Stair_Builder.main }
	file_loaded("dbstairbuilder")
end

[Deanby7]

Spotted my error.... p0 = [org] , should be p0 = org
I had 0,0,0 in there before changing it to a variable. Apologies for wasting forum time!!!

[TIG]

Of course you can use...
org = ORIGIN
BUT... if you want to change org later on, then use
org = ORIGIN.clone

[thomthom]

To get the working model axes there is a hack for older versions of SU - if you only need the direction. You aren't able to obtain the origin though.

Here's a snippet directly from Vertex Tools:

    # SU7+ only - incorrect in older versions.
    # A hack to get the current model axis.
    #
    # @return [Array<Vector3d,Vector3d,Vector3d>]
    # @since 1.0.0
    def get_local_axis
      if FEATURE_MOVING_AXIS
        # SketchUp 8+
        tr = get_local_transformation
      elsif @model.respond_to?( ;edit_transform )
        # SketchUp 7
        if @model.active_path
          tr = @model.edit_transform
        else
          tr = get_local_transformation
        end
      else
        # SketchUp 6
        tr = Geom;;Transformation.new
      end
      [ tr.xaxis, tr.yaxis, tr.zaxis ]
    end

    # SU7+ only - incorrect in older versions.
    # A hack to get the current model axis.
    #
    # @return [Array<Vector3d,Vector3d,Vector3d>]
    # @since 1.1.0
    def get_local_transformation
      @model.start_operation('Get Local Transformation (Hack)')
      entities = @model.active_entities
      tr = entities.add_group(entities.add_group).transformation
      # (?) SketchUp bug?
      #     The transformation returned has X, Y and Z set to 1.0e+030!
      #     Why this high value? Overflow bug?
      Geom;;Transformation.new( tr.xaxis, tr.yaxis, tr.zaxis, ORIGIN )
    ensure
      @model.abort_operation
    end

That FEATURE_MOVING_AXIS constant comes from a check if the SU version is 8 or higher.