[Question-difficulty 4/5] Group.transform!

[rvs1977]

Hi all.

This one I have messed around with, for more than a week now, and is at the point to give up

My task is to make a tool that rotate a group in the direction of the mousepointer. It has turned out to be a difficult task because, it doesn't seems to be a way of keeping track of the group direction.

The problem using t= Geom::Transformation.rotation (point, Z_AXIS, delta_angle) and group.transform! t )is the delta_angle. Using this method it adds the angle to the previous angle.

This is what I have tried: (runable from the RCE)

class YV_tool
  def initialize
    @mod = Sketchup.active_model 
    @ent = @mod.entities    
    @state = 0

    inches = 1
    @mm = inches.to_mm

      
     @pts = []
     @pts[0] = [0,0,0]
     @pts[1] = [108/@mm,0,0]
     @pts[2] = [108/@mm,224/@mm,0]
     @pts[3] = [0,224/@mm,0]
  
  end # initialize

  def activate 
  end 

  def onMouseMove(flags, x, y, view) 
     ip = Sketchup;;InputPoint.new
     ip.pick view, x,y
     ip = ip.position 

     if (@state == 0) # Create Wall_group 
      @yv_group = @ent.add_group
      yv_face = @yv_group.entities.add_face @pts 
      yv_face.pushpull -10
      
      wall_edge = @yv_group.entities.add_line ([0,0,0], [1000/@mm,0,0])
      @yv_group_vector = wall_edge.line
       
      point = Geom;;Point3d.new ip 
      new_transform = Geom;;Transformation.new point  
      @yv_group.transformation = new_transform
      @state = 1
    end
    if (@state == 1) # group follow mousemove
      Sketchup.status_text = "@state = 1 ; Inputpoint; ", ip, "@yv_group_vector; ", @yv_group_vector  
      point = Geom;;Point3d.new ip 
      new_transform = Geom;;Transformation.new (point)
      @yv_group.transformation =  new_transform
    end
    if (@state == 2) # onLMouseButton place group in choosen position
      Sketchup.status_text = "@state = 2 ; Inputpoint; ", ip 
      point = Geom;;Point3d.new ip 
      new_transform = Geom;;Transformation.new (point)
      @yv_group.transformation =  new_transform
      @ip1 = ip
     
      @vec1 = Geom;;Vector3d.new X_AXIS
      @state = 3      
    end
    if (@state == 3) # Rotating and stretching
      vec2 = @ip1.vector_to (ip)
      v1 = @vec1.angle_between X_AXIS
      
      v2 = vec2.angle_between X_AXIS
      #Sketchup.status_text = "@state = 3 ; v1; ", v1, " v2; ", v2, " @vec1; ",  @vec1
        #1 calulate delta_v if mousemove is counterclockwice and if vec1 and vec2 is in quadrant 1 or 2 of the unitcircle  
        if ((v2>v1)  && ((vec2.x >= 0 && vec2.y > 0)  && (@vec1.x >= 0 && @vec1.y > 0)  || (vec2.x <=0 && vec2.y > 0) && (@vec1.x >= 0 && @vec1.y > 0 ) || (vec2.x <= 0 && vec2.y > 0) && (@vec1.x <= 0 && @vec1.y > 0)))
         delta_v = v2-v1
         #Sketchup.status_text = "@state = 3 ; ; v2>v1 ; Delta_v; ", delta_v 
        end

        #2 calulate delta_v if mousemove is counterclockwice and if vec1 and vec2 is in quadrant 3 or 4 of the unitcircle  
        if ((v1>v2)  && ((@vec1.x <= 0 && @vec1.y < 0)  && (vec2.x <= 0 && vec2.y < 0)  || (@vec1.x <=0 && @vec1.y < 0) && (vec2.x >= 0 && vec2.y < 0 ) || (@vec1.x >= 0 && @vec1.y < 0) && (vec2.x >= 0 && vec2.y < 0)))
         delta_v = v1-v2
         #Sketchup.status_text = "@state = 3 ; ; v1>v2 ; Delta_v; ", delta_v 
        end
      
        #3 calulate delta_v if mousemove is clockwice and if vec1 and vec2 is in quadrant 1 or 2 of the unitcircle
        if ((v1>v2)  && ((@vec1.x <= 0 && @vec1.y > 0)  && (vec2.x <= 0 && vec2.y > 0)  || (@vec1.x <=0 && @vec1.y > 0) && (vec2.x >= 0 && vec2.y > 0 ) || (@vec1.x >= 0 && @vec1.y > 0) && (vec2.x >= 0 && vec2.y > 0)))
         delta_v = v2-v1
         #Sketchup.status_text = "@state = 3 ; ; v1>v2 ; Delta_v; ", delta_v 
        end

        #4 calulate delta_v if mousemove is clockwice and if vec1 and vec2 is in quadrant 3 or 4 of the unitcircle 
        if ((v2>v1)  && ((vec2.x <= 0 && vec2.y < 0)  && (@vec1.x <= 0 && @vec1.y < 0)  || (vec2.x <=0 && vec2.y < 0) && (@vec1.x >= 0 && @vec1.y < 0 ) || (vec2.x >= 0 && vec2.y < 0) && (@vec1.x >= 0 && @vec1.y < 0)))
         delta_v = v1-v2
         #Sketchup.status_text = "@state = 3 ; ; v2>v1 ; Delta_v; ", delta_v 
        end


      @vec1 = vec2
        
      t_yv = Geom;;Transformation.rotation (@ip1, Z_AXIS, delta_v)
      @yv_group.transform! t_yv
        
     t_old = @yv_group.transformation
     Sketchup.status_text = "@state = 3 ; Transformation ", t_old

    end
  end # onMouseMove
  
  def onLButtonDown (flags, x, y, view)
    if (@state == 3)
      @state = 4
    end

    if (@state == 1)
      @state = 2
    end
  end # onLButtonDown

  def reset
    @state = 0
  end
end # class YV_tool
 
     yvtool = YV_tool.new 
     Sketchup.active_model.select_tool yvtool

As you can see, the group turn around, but not directly at the mousepointer.

I hope someone can come up with some ideas. Until then I will keep fighting...

Thanks in advance
-RVS

[TIG]

Rasmus

Find my FreeRotate.rb script - readily available on this ' Plugins' forum.
It has a method of rotating the selection [which is temporarily grouped] so that it follows the cursor as it moves - it does this by constantly transforming the group and swapping the current value for the last one. In it you must pick two points to set the initial axis... but you could use your pt0=group.entities.parent.insertion_point insertion point [transformed by the tr=group.transformation as pt0.transform!(tr)] and then another logical point - perhaps pt1=pt0.offset(Z_AXIS,1) - or perhaps pt1=pt0.offset((pt0.vector_to(eye)),1) [where eye=model.active_view.camera.eye] - but this all depends on what point you want to rotate around and what initial 'vector' you want to use to kick-off with...

[rvs1977]

well thanks TIG!

I will study the script and hopefully get it