Class: GlimR::Viewport

Inherits:
SceneObject show all
Defined in:
lib/glimr/renderer/viewport.rb

Overview

Viewport is a scene graph root node and takes care of drawing its subtree and mapping mouse events to its child nodes.

Instance Attribute Summary collapse

Attributes inherited from SceneObject

#children, #mtime, #parent

Attributes included from EventListener

#event_listeners, #listener_count

Instance Method Summary collapse

Methods inherited from SceneObject

#<<, #add_drawables, #attach, #clone, #detach, #detach_self, #inspect, #pop_state, #push_state, #remove_drawables, #replace_node, #root, #touch!, #visible

Methods included from EventListener

#add_event_listener, #decrement_listener_count, #dispatch_event, #increment_listener_count, #method_missing, #multicast_event, #process_event, #remove_event_listener

Constructor Details

#initialize(*a, &b) ⇒ Viewport

Returns a new instance of Viewport.



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# File 'lib/glimr/renderer/viewport.rb', line 30

def initialize(*a,&b)
  @down_x = 0
  @down_y = 0
  @old_collisions = []
  @mouse_down_collisions = []
  @drag_targets = {}
  super
  add_event_listener(:mouse_move, :mouse_move_handler, true)
  add_event_listener(:click, :click_handler, true)
  add_event_listener(:mouse_down, :mouse_down_handler, true)
  add_event_listener(:mouse_up, :mouse_up_handler, true)
  add_event_listener(:resize, :resize_handler, true)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class GlimR::EventListener

Instance Attribute Details

#camera ⇒ Object

Returns the value of attribute camera.



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# File 'lib/glimr/renderer/viewport.rb', line 16

def camera
  @camera
end

#height ⇒ Object

Returns the value of attribute height.



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# File 'lib/glimr/renderer/viewport.rb', line 16

def height
  @height
end

#width ⇒ Object

Returns the value of attribute width.



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# File 'lib/glimr/renderer/viewport.rb', line 16

def width
  @width
end

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/glimr/renderer/viewport.rb', line 16

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/glimr/renderer/viewport.rb', line 16

def y
  @y
end

Instance Method Details

#absolute_geometry ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 252

def absolute_geometry
  Geometry.new
end

#absolute_material ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 244

def absolute_material
  Material.new
end

#absolute_shader ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 256

def absolute_shader
  Shader.new
end

#absolute_texture ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 248

def absolute_texture
  Texture.new
end

#absolute_transform ⇒ Object

The absolute state of a viewport is empty starter state. This to provide the SceneObject absolute state methods a starting point.



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# File 'lib/glimr/renderer/viewport.rb', line 235

def absolute_transform
  camera.absolute_transform
end

#absolute_transform_for_drawing ⇒ Object

Behave like a square when going through drawing list.



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# File 'lib/glimr/renderer/viewport.rb', line 240

def absolute_transform_for_drawing
  parent.absolute_transform
end

#apply ⇒ Object

Applies viewport to OpenGL state, scissor to viewport, enable blending and apply camera.



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# File 'lib/glimr/renderer/viewport.rb', line 266

def apply
  @last_frame_time = @mtime
  apply_clip
  clear_viewport
  apply_camera
  apply_blend
  draw_drawables
end

#apply_blend ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 289

def apply_blend
  Enable GL::BLEND
  BlendFunc(GL::SRC_ALPHA, GL::ONE_MINUS_SRC_ALPHA)
end

#apply_camera ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 294

def apply_camera
  if camera
    camera.viewport = self
    camera.apply
  end
end

#apply_clip ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 275

def apply_clip
  Viewport(viewport_x, viewport_y, viewport_width, viewport_height)
  Enable SCISSOR_TEST
  Scissor(viewport_x, viewport_y, viewport_width, viewport_height)
end

#aspect ⇒ Object

Width per height aspect of the viewport.



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# File 'lib/glimr/renderer/viewport.rb', line 334

def aspect
  width.to_f / height
end

#changed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimr/renderer/viewport.rb', line 260

def changed?
  @last_frame_time != @mtime
end

#clear_viewport ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 281

def clear_viewport
  if background
    GL.ClearColor(*background)
    GL.Clear(GL::COLOR_BUFFER_BIT)
    GL.Clear(GL::DEPTH_BUFFER_BIT) if clear_depth_buffer
  end
end

#click_handler(o, e) ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 197

def click_handler(o,e)
  e.phase = :bubble
end

#collides?(d, ex, ey) ⇒ Boolean

Tests if the coordinates ex and ey fall within the rectangle of drawable d.

Returns:

  • (Boolean) 


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# File 'lib/glimr/renderer/viewport.rb', line 210

def collides?( d, ex, ey )
  MatrixMode MODELVIEW
  PushMatrix()
    LoadIdentity()
    MultMatrix(d.absolute_transform_for_drawing)
    Translate(-ex,-ey,0)
    camatrix = GetDoublev(MODELVIEW_MATRIX)
  PopMatrix()
  if (camatrix[3][0]+d.min_x+d.max_x >= d.min_x and camatrix[3][0]+d.min_x+d.max_x <= d.max_x and
      camatrix[3][1]+d.min_y+d.max_y >= d.min_y and camatrix[3][1]+d.min_y+d.max_y <= d.max_y)
    [-camatrix[3][0], -camatrix[3][1], d] # return relative x & y -coordinates and the drawable

  else
    nil
  end
end

#default_config ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 19

def default_config
  super.merge(
    :click_time => 0.3,
    :click_radius => 4,
    :background => nil,
    :clear_depth_buffer => false,
    :camera => Camera.new,
    :x => 0, :y => 0, :width => 1, :height => 1
  )
end

#draw_drawables ⇒ Object

Draws the viewport drawables using painter’s algorithm.



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# File 'lib/glimr/renderer/viewport.rb', line 302

def draw_drawables
  collapsed = (@drawables).find_all{|d| d.visible }
  collapsed = collapsed.sort_by{|d|
    d.absolute_transform.flatten[14]
  }
  collapsed.each{|d|
    PushAttrib( TEXTURE_BIT | LIGHTING_BIT )
      LoadMatrix(d.absolute_transform_for_drawing)
      d.absolute_texture.apply
      d.absolute_material.apply
      d.push_state
        d.apply
      d.pop_state
    PopAttrib()
    if d.is_a? Viewport
      apply_clip
      apply_camera
    end
  }
end

#drawables ⇒ Object

Viewport presents only itself to its parent.



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# File 'lib/glimr/renderer/viewport.rb', line 329

def drawables
  Set.new + [self]
end

#drawables_under_cursor(e) ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 201

def drawables_under_cursor(e)
  collapsed = (@drawables - [self])
  collisions = collapsed.map{|d|
    collides?( d, e.x, e.y ) if d.visible
  }.compact
  collisions.sort_by{|c| -c[2].absolute_transform.flatten[14] } # reverse z-sort

end

#event_root ⇒ Object

Acts as root node for dispatched events



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# File 'lib/glimr/renderer/viewport.rb', line 45

def event_root
  true
end

#max_x ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 53

def max_x
  viewport_width
end

#max_y ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 61

def max_y
  viewport_height
end

#min_x ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 49

def min_x
  @x
end

#min_y ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 57

def min_y
  @y
end

#mouse_down_handler(o, e) ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 137

def mouse_down_handler(o,e)
  params = e.params.clone
  params[:x] += x
  params[:y] += y
  @down_x = params[:x]
  @down_y = params[:y]
  @click_valid = true
  @down_time = Time.now.to_f
  collisions = drawables_under_cursor(e)
  @mouse_down_collisions = collisions.map{|rx,ry,c| c }
  collisions.each{|rx, ry, c|
    evt = Event.new(:mouse_down,
      e.params.merge(:sender => self, :target => c, :rx => rx, :ry => ry))
    c.dispatch_event(evt)
  }
  if collisions.first
    @drag_targets[e.button] = collisions.first[2]
  else
    @drag_targets.delete(e.button)
  end
  e.phase = :bubble
end

#mouse_move_handler(o, e) ⇒ Object

Tracks mouse pointer position and sends hover, mouse_out, and mouse_over -events to nodes interacting with the mouse pointer.



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# File 'lib/glimr/renderer/viewport.rb', line 108

def mouse_move_handler(o,e)
  params = e.params.clone
  params[:x] += x
  params[:y] += y
  if Vector[@down_x - params[:x], @down_y - params[:y]].r > @click_radius
    @click_valid = false
  end
  duc = drawables_under_cursor(e)
  collisions = duc.map{|rx,ry,c| c }
  (@old_collisions - collisions).each{|oc|
    evt = Event.new(:mouse_out,
      params.merge(:sender => self, :target => oc))
    oc.dispatch_event(evt)
  }
  (collisions - @old_collisions).each{|oc|
    evt = Event.new(:mouse_over,
      params.merge(:sender => self, :target => oc))
    oc.dispatch_event(evt)
  }
  @old_collisions = collisions
  children.each{|c|
    c.multicast_event(Event.new(:mouse_move, params))
  }
  @drag_targets.each{|k,t|
    t.dispatch_event(Event.new(:drag, params.merge(:button => k)))
  }
  e.phase = :bubble
end

#mouse_up_handler(o, e) ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 160

def mouse_up_handler(o,e)
  params = e.params.clone
  params[:x] += x
  params[:y] += y
  if Vector[@down_x - params[:x], @down_y - params[:y]].r > @click_radius or (Time.now.to_f - @down_time) > @click_time
    @click_valid = false
  end
  children.each{|c|
    c.multicast_event(Event.new(:mouse_up, params))
  }
  if @click_valid or @drag_targets[e.button]
    collisions = drawables_under_cursor(e)
    if @click_valid
      collisions.each{|rx,ry,c|
        if @mouse_down_collisions.include? c
          evt = Event.new(:click, params.merge(:sender => self, :rx => rx, :ry => ry))
          c.dispatch_event(evt)
        end
        break
      }
    end
    if @drag_targets[e.button]
      if collisions.first
        @drag_targets[e.button].dispatch_event(
          Event.new(
            :drop,
            params.merge(:drop_target => collisions.first[2], :rx => collisions.first[0], :ry => collisions.first[1])
          )
        )
      end
      @drag_targets.delete(e.button)
    end
  end
  @mouse_down_collisions.clear
  e.phase = :bubble
end

#render ⇒ Object

Draws the viewport drawables using painter’s algorithm.



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# File 'lib/glimr/renderer/viewport.rb', line 227

def render
  apply
end

#resize_handler(o, e) ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 98

def resize_handler(o,e)
  if !parent
    self.width = e.width
    self.height = e.height
  end
end

#viewport ⇒ Object

The viewport of a Viewport is the Viewport itself.



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# File 'lib/glimr/renderer/viewport.rb', line 324

def viewport
  self
end

#viewport_height ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 90

def viewport_height
  if parent
    @height * parent.absolute_transform.flatten[5]
  else
    @height
  end
end

#viewport_width ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 82

def viewport_width
  if parent
    @width * parent.absolute_transform.flatten[0]
  else
    @width
  end
end

#viewport_x ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 65

def viewport_x
  if parent
    abs_x = @x + parent.absolute_transform.flatten[12]
  else
    @x
  end
end

#viewport_y ⇒ Object 



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# File 'lib/glimr/renderer/viewport.rb', line 73

def viewport_y
  if parent
    abs_y = @y + parent.absolute_transform.flatten[13]
    parent.viewport.height - abs_y - @height
  else
    -@y
  end
end