Class: Disp3D::Manipulator

Inherits:
Object
  • Object
show all
Defined in:
lib/manipulator.rb

Instance Method Summary collapse

Constructor Details

#initialize(camera, picker) ⇒ Manipulator

Returns a new instance of Manipulator.



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# File 'lib/manipulator.rb', line 6

def initialize(camera, picker)
  @camera = camera
  @picker = picker

  @start_x = 0
  @start_y = 0

  @rotating = false
  @scalling = false
  @translating = false
  @trackball_size = 0.8
end

Instance Method Details

#centering(scene_graph) ⇒ Object 



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# File 'lib/manipulator.rb', line 19

def centering(scene_graph)
  @camera.pre_translate = Vector3.new()
  set_rotation_ceter(scene_graph.center)
end

#fit(scene_graph) ⇒ Object 



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# File 'lib/manipulator.rb', line 24

def fit(scene_graph)
  centering(scene_graph)
  @camera.fit(scene_graph.radius)
end

#motion(x, y) ⇒ Object

return true if should be redisplay



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# File 'lib/manipulator.rb', line 68

def motion(x,y)
  dmy, dmy, width, height = @camera.viewport()
  if( @translating )
    delta_x = 2*((@start_x - x).to_f/width)
    delta_y = 2*((@start_y - y).to_f/height)
    @start_x = x
    @start_y = y

    @camera.pre_translate.x -= delta_x*@camera.obj_rep_length
    @camera.pre_translate.y += delta_y*@camera.obj_rep_length
    return true
  elsif ( @scalling )
    @camera.scale *= (1.0+(@start_y - y).to_f/height)
    @start_y = y
    return true
  elsif ( @rotating )
    @lastquat =trackball(
               (2.0 * @start_x - width) / width,
               (height - 2.0 * @start_y) / height,
               (2.0 * x - width) / width,
               (height - 2.0 * y) / height)
    @start_x = x
    @start_y = y
    @camera.rotate = @lastquat * @camera.rotate if( @lastquat )
    return true
  end
  return false
end

#mouse(button, state, x, y) ⇒ Object 



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# File 'lib/manipulator.rb', line 41

def mouse(button,state,x,y)
  if (state == GLUT::GLUT_DOWN &&
      ((button == GLUT::GLUT_RIGHT_BUTTON && @rotating == true) ||
      (button == GLUT::GLUT_LEFT_BUTTON && @scalling == true) ))
    # pushed left and right at the same time
    @translating = true
    @start_x = x
    @start_y = y
  elsif (button == GLUT::GLUT_RIGHT_BUTTON && state == GLUT::GLUT_DOWN)
    @scalling = true
    @start_y = y
  elsif ( button == GLUT::GLUT_LEFT_BUTTON && state == GLUT::GLUT_DOWN )
    @rotating = true
    @start_x = x
    @start_y = y
  elsif ( button == GLUT::GLUT_MIDDLE_BUTTON && state == GLUT::GLUT_DOWN )
    set_clicked_point_as_rotation_center(x,y)
  elsif ( button == GLUT::GLUT_RIGHT_BUTTON && state == GLUT::GLUT_UP )
    @scalling = false
    @translating = false
  elsif ( button == GLUT::GLUT_LEFT_BUTTON && state == GLUT::GLUT_UP )
    @rotating = false
    @translating = false
  end
end

#set_rotation_ceter(rot_center) ⇒ Object 



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# File 'lib/manipulator.rb', line 29

def set_rotation_ceter(rot_center)
  scale = @camera.scale
  post_trans_vec = @camera.post_translate.to_column_vector
  pre_trans_vec = @camera.pre_translate.to_column_vector
  rot_mat = Matrix.from_quat(@camera.rotate)
  new_pre_translate = ( rot_mat.t * post_trans_vec * scale + pre_trans_vec ) +
    rot_mat.t * rot_center.to_column_vector * scale
  new_pre_translate = GMath3D::Vector3.new(new_pre_translate[0,0], new_pre_translate[1,0], new_pre_translate[2,0])
  @camera.pre_translate = new_pre_translate
  @camera.post_translate = rot_center*-1.0
end