Direction axis

Developers Ruby API
1

Hello everyone,
how to get direction axis perpendicular to the selected face with the click of the mouse, through the ruby language, a help to show me the way to follow or the part of the manual to watch and study or some example to follow and study.

thanks

Joseph

2

face.normal

Note that if the face is not within the general model’s entities but is within a group or component-instance then you need to get its transformation and apply that to the normal’s vector value to compensate for the fact the container might be rotated etc…

3

I’m extending the code snippet given by me in your other topic.

Reference links (see in code comments)
(1) Face#normal-instance_method
(2) Vector3d#axes-instance_method
(3) Axes#set-instance_method
(4) top-level-namespace

class TesttoolAxes
  def initialize
    @face = nil
    @tr = IDENTITY
  end
  
  def deactivate(view)
     # restore the original axes when the tool deactivated /link (3) & (4)/
     # the result is same as the user right click one of the axis 
     #  and choose "Reset" from context menu
    Sketchup.active_model.axes.set(ORIGIN, X_AXIS, Y_AXIS, Z_AXIS)
  end
  
  def get_trans(ph, obj)
    ph.count.times{|i|
      if ph.leaf_at(i) == obj
        return ph.transformation_at(i)
      end
    }
    IDENTITY
  end

  def onMouseMove(flags, x, y, view)
    ph_fe = view.pick_helper
    ph_fe.do_pick(x, y, 0)
    face = ph_fe.picked_face
    @face = face ? face : nil
    @tr = get_trans( ph_fe, face ) if face
    view.invalidate
  end

  def onLButtonUp(flags, x, y, view)
    if @face
      @c_face = @face 
      @c_tr = @tr
      puts "#{@c_face} outer loop is highlighted."
      
      # get new z-axis from the face normal /link (1)/
      # considering it's parent's transformation
      # this is perpendicular to face
      new_zaxis = @face.normal.transform( @tr )
      
      # compute an arbitrary set of axes with the given vector 
      #   as the z-axis direction  /link (2)/
      new_xaxis = new_zaxis.axes[0]
      new_yaxis = new_zaxis.axes[1]
      
      # set the axes with the new vectors / link (3)/
      # in this example I keep the origin, but 
      # the first parameter can be other (Geom::Point3d)
      Sketchup.active_model.axes.set(ORIGIN, new_xaxis, new_yaxis, new_zaxis)
    end
    view.invalidate
  end

  def draw(view)
    if @face
      loop = @face.outer_loop.vertices.map{|v|
        v.position.transform( @tr )
      }
      view.drawing_color = [0,0,256, 64] 
      view.draw(GL_POLYGON, loop)
      view.drawing_color = [0,0,256, 32] 
      view.draw2d(GL_POLYGON, loop.map{|p| view.screen_coords(p)})
    end
    if @c_face
      c_loop = @c_face.outer_loop.vertices.map{|v|
        v.position.transform( @c_tr )
      }
      view.line_width = 3
      view.drawing_color ="blue" 
      view.draw(GL_LINE_LOOP, c_loop)
    end
  end
end
Sketchup.active_model.select_tool(TesttoolAxes.new)

EDIT:
In case you want to go back as it was before the tool activated, 2 methods will looks like


  def initialize
    @face = nil
    @tr = IDENTITY
    @orig_origin, @orig_xaxis, @orig_yaxis, @orig_zaxis = Sketchup.active_model.axes.to_a
  end
  
  def deactivate(view)
     # restore the original axes as before the tool were activated
     # when the tool deactivated 
    Sketchup.active_model.axes.set(@orig_origin, @orig_xaxis, @orig_yaxis, @orig_zaxis)
  end

…and: Sketchup.active_model.axes.set(ORIGIN, new_xaxis, new_yaxis, new_zaxis)

  def onLButtonUp(flags, x, y, view)
    .
    .
    Sketchup.active_model.axes.set(@orig_origin, new_xaxis, new_yaxis, new_zaxis)
  end
1 Like
4

typo in the last line: @orig_xaxis is repeated where y and z should be.

1 Like
5

Thank you very much for sending me these lines of code… now I study it… good evening.
Joseph

6

Thank you very much…
good evening.
Joseph