Class: Lotu::InterpolationSystem

Inherits:
BaseSystem show all
Defined in:
lib/lotu/systems/interpolation_system.rb

Defined Under Namespace

Modules: UserMethods

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from BaseSystem

#draw, #dt

Constructor Details

#initialize(user, opts = {}) ⇒ InterpolationSystem

Returns a new instance of InterpolationSystem.



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# File 'lib/lotu/systems/interpolation_system.rb', line 7

def initialize(user, opts={})
  super
  # TODO: cambiar esto por un include en la clase mejor
  user.extend(UserMethods)
  @interpolations = []
  @tagged_for_deletion = []
end

Instance Attribute Details

#interpolations ⇒ Object

Returns the value of attribute interpolations.



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# File 'lib/lotu/systems/interpolation_system.rb', line 5

def interpolations
  @interpolations
end

Instance Method Details

#interpolate(object, property, opts) ⇒ Object 



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# File 'lib/lotu/systems/interpolation_system.rb', line 15

def interpolate(object, property, opts)
  interpolation = {
    :object => object,
    :property_getter => property,
    :property_setter => "#{property}=",
    :accum_time => 0,
    :calc => 0,
    :init => Float(opts[:init]),
    :end => Float(opts[:end]),
    :duration => opts[:duration] || 1,
    :start_in => opts[:start_in] || 0,
    :on_stop => opts[:on_stop] || :current,
    :every_value => opts[:every_value],
    # TODO: implement callback mechanism
    :callback => opts[:callback],
    :loop => opts[:loop],
    :bounce => opts[:bounce],
    :bouncing_back => false
  }
  @interpolations << interpolation
end

#tag_for_deletion(interpolation) ⇒ Object 



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# File 'lib/lotu/systems/interpolation_system.rb', line 73

def tag_for_deletion(interpolation)
  @tagged_for_deletion << interpolation
end

#to_s ⇒ Object 



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# File 'lib/lotu/systems/interpolation_system.rb', line 77

def to_s
  ["@interpolations.length #{@interpolations.length}",
   "@tagged_for_deletion.length #{@tagged_for_deletion.length}"]
end

#update ⇒ Object

TODO: incluir código para :loop_for => n TODO: incluir soporte para “encimar” varias interpolaciones sobre una misma propiedad, de esa manera podemos “acumular” varias interpolaciones y el resultado se suma y se aplica a la propiedad una vez que todo el grupo ha sido calculado



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# File 'lib/lotu/systems/interpolation_system.rb', line 42

def update
  @interpolations.each do |t|
    t[:accum_time] += dt
    if t[:accum_time] > t[:start_in]
      step = ( t[:end] - t[:init] )/t[:duration] * dt
      t[:calc] += step
      tag_for_deletion( t ) if step == 0
      if( t[:init] + t[:calc] > t[:end] && step > 0 ) || ( t[:init] + t[:calc] < t[:end] && step < 0 )
        if t[:loop] || ( t[:bounce] && !t[:bouncing_back] )
          t[:calc] = 0
        else
          t[:calc] = t[:end] - t[:init]
          tag_for_deletion(t)
        end
        if t[:bounce]
          t[:bouncing_back] = !t[:bouncing_back]
          t[:init], t[:end] = t[:end], t[:init]
        end
      end
      value = t[:init] + t[:calc]
      value = value.send(t[:every_value]) if t[:every_value]
      t[:object].send( t[:property_setter], value )
    end
  end

  @tagged_for_deletion.each do |to_delete|
    #@interpolations.delete( to_delete )
    @interpolations.delete_if{ |i| i.object_id == to_delete.object_id }
  end.clear
end