Class: GlimR::Viewport
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
#event_listeners, #listener_count
Instance Method Summary
collapse
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#absolute_geometry ⇒ Object
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#absolute_material ⇒ Object
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#absolute_shader ⇒ Object
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#absolute_texture ⇒ Object
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#absolute_transform ⇒ Object
The absolute state of a viewport is empty starter state.
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#absolute_transform_for_drawing ⇒ Object
Behave like a square when going through drawing list.
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#apply ⇒ Object
Applies viewport to OpenGL state, scissor to viewport, enable blending and apply camera.
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#apply_blend ⇒ Object
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#apply_camera ⇒ Object
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#apply_clip ⇒ Object
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#aspect ⇒ Object
Width per height aspect of the viewport.
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#changed? ⇒ Boolean
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#clear_viewport ⇒ Object
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#click_handler(o, e) ⇒ Object
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#collides?(d, ex, ey) ⇒ Boolean
Tests if the coordinates ex and ey fall within the rectangle of drawable d.
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#default_config ⇒ Object
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#draw_drawables ⇒ Object
Draws the viewport drawables using painter’s algorithm.
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#drawables ⇒ Object
Viewport presents only itself to its parent.
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#drawables_under_cursor(e) ⇒ Object
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#event_root ⇒ Object
Acts as root node for dispatched events.
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#initialize(*a, &b) ⇒ Viewport
constructor
A new instance of Viewport.
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#max_x ⇒ Object
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#max_y ⇒ Object
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#min_x ⇒ Object
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#min_y ⇒ Object
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#mouse_down_handler(o, e) ⇒ Object
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#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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#mouse_up_handler(o, e) ⇒ Object
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#render ⇒ Object
Draws the viewport drawables using painter’s algorithm.
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#resize_handler(o, e) ⇒ Object
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#viewport ⇒ Object
The viewport of a Viewport is the Viewport itself.
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#viewport_height ⇒ Object
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#viewport_width ⇒ Object
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#viewport_x ⇒ Object
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#viewport_y ⇒ Object
Methods inherited from SceneObject
#<<, #add_drawables, #attach, #clone, #detach, #detach_self, #inspect, #pop_state, #push_state, #remove_drawables, #replace_node, #root, #touch!, #visible
#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(:window_resize, :resize_handler, true)
end
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Dynamic Method Handling
This class handles dynamic methods through the method_missing method
in the class GlimR::EventListener
Instance Attribute Details
Returns the value of attribute camera.
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# File 'lib/glimr/renderer/viewport.rb', line 16
def camera
@camera
end
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Returns the value of attribute height.
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# File 'lib/glimr/renderer/viewport.rb', line 16
def height
@height
end
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Returns the value of attribute width.
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# File 'lib/glimr/renderer/viewport.rb', line 16
def width
@width
end
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Returns the value of attribute x.
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# File 'lib/glimr/renderer/viewport.rb', line 16
def x
@x
end
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Returns the value of attribute y.
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# File 'lib/glimr/renderer/viewport.rb', line 16
def y
@y
end
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Instance Method Details
#absolute_geometry ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 255
def absolute_geometry
Geometry.new
end
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#absolute_material ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 247
def absolute_material
Material.new
end
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#absolute_shader ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 259
def absolute_shader
Shader.new
end
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#absolute_texture ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 251
def absolute_texture
Texture.new
end
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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 238
def absolute_transform
camera.absolute_transform
end
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Behave like a square when going through drawing list.
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# File 'lib/glimr/renderer/viewport.rb', line 243
def absolute_transform_for_drawing
parent.absolute_transform
end
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Applies viewport to OpenGL state, scissor to viewport, enable blending and apply camera.
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# File 'lib/glimr/renderer/viewport.rb', line 269
def apply
@last_frame_time = @mtime
apply_clip
clear_viewport
apply_camera
apply_blend
draw_drawables
end
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#apply_blend ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 292
def apply_blend
Enable GL::BLEND
BlendFunc(GL::SRC_ALPHA, GL::ONE_MINUS_SRC_ALPHA)
end
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#apply_camera ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 297
def apply_camera
if camera
camera.viewport = self
camera.apply
end
end
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#apply_clip ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 278
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
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Width per height aspect of the viewport.
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# File 'lib/glimr/renderer/viewport.rb', line 337
def aspect
width.to_f / height
end
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#changed? ⇒ Boolean
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# File 'lib/glimr/renderer/viewport.rb', line 263
def changed?
@last_frame_time != @mtime
end
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#clear_viewport ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 284
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
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#click_handler(o, e) ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 200
def click_handler(o,e)
e.phase = :bubble
end
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#collides?(d, ex, ey) ⇒ Boolean
Tests if the coordinates ex and ey fall within the rectangle of drawable d.
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# File 'lib/glimr/renderer/viewport.rb', line 213
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] else
nil
end
end
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#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
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#draw_drawables ⇒ Object
Draws the viewport drawables using painter’s algorithm.
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# File 'lib/glimr/renderer/viewport.rb', line 305
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
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#drawables ⇒ Object
Viewport presents only itself to its parent.
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# File 'lib/glimr/renderer/viewport.rb', line 332
def drawables
Set.new + [self]
end
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#drawables_under_cursor(e) ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 204
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] } end
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#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
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# File 'lib/glimr/renderer/viewport.rb', line 53
def max_x
viewport_width
end
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# File 'lib/glimr/renderer/viewport.rb', line 61
def max_y
viewport_height
end
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# File 'lib/glimr/renderer/viewport.rb', line 49
def min_x
@x
end
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# File 'lib/glimr/renderer/viewport.rb', line 57
def min_y
@y
end
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#mouse_down_handler(o, e) ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 138
def mouse_down_handler(o,e)
mouse_move_handler o, e if !parent
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
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#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 109
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 }
(collisions - @old_collisions).each{|oc|
evt = Event.new(:mouse_over,
params.merge(:sender => self, :target => oc))
oc.dispatch_event(evt)
}
(@old_collisions - collisions).each{|oc|
evt = Event.new(:mouse_out,
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
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#mouse_up_handler(o, e) ⇒ Object
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# File 'lib/glimr/renderer/viewport.rb', line 162
def mouse_up_handler(o,e)
mouse_move_handler o, e if !parent
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
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Draws the viewport drawables using painter’s algorithm.
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# File 'lib/glimr/renderer/viewport.rb', line 230
def render
apply
end
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#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
multicast_event(Event.new(:resize, e.params))
end
end
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The viewport of a Viewport is the Viewport itself.
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# File 'lib/glimr/renderer/viewport.rb', line 327
def viewport
self
end
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#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
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#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
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#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
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#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
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