Class: Lotu::TransformationSystem

Inherits:
System
  • Object
show all
Defined in:
lib/lotu/systems/transformation_system.rb

Defined Under Namespace

Modules: UserMethods

Instance Method Summary collapse

Methods inherited from System

#draw, #dt

Constructor Details

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

Returns a new instance of TransformationSystem.



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# File 'lib/lotu/systems/transformation_system.rb', line 4

def initialize(user, opts={})
  super
  user.extend(UserMethods)
  @transformations = []
  @tagged_for_deletion = []
end

Instance Method Details

#tag_for_deletion(transform) ⇒ Object 



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# File 'lib/lotu/systems/transformation_system.rb', line 64

def tag_for_deletion(transform)
  @tagged_for_deletion << transform
end

#to_s ⇒ Object 



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# File 'lib/lotu/systems/transformation_system.rb', line 68

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

#transform(object, property, opts) ⇒ Object 



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# File 'lib/lotu/systems/transformation_system.rb', line 11

def transform(object, property, opts)
  transformation = {
    :object => object,
    :property_getter => property,
    :property_setter => "#{property}=",
    :accum_time => 0,
    :calc => 0,
    :init => opts[:init],
    :end => opts[:end],
    :duration => opts[:duration] || 1,
    :start_in => opts[:start_in] || 0,
    :on_result => opts[:on_result],
    :loop => opts[:loop]
  }
  @transformations << transformation
end

#update ⇒ Object 



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# File 'lib/lotu/systems/transformation_system.rb', line 28

def update
  @transformations.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
      if step > 0
        if t[:init] + t[:calc] > t[:end]
          if t[:loop]
            t[:calc] = 0
          else
            t[:calc] = t[:end] - t[:init]
            tag_for_deletion(t)
          end
        end
      else
        if t[:init] + t[:calc] < t[:end]
          if t[:loop]
            t[:calc] = 0
          else
            t[:calc] = t[:end] - t[:init]
            tag_for_deletion(t)
          end
        end
      end
      value = t[:init] + t[:calc]
      value = value.send(t[:on_result]) if t[:on_result]
      t[:object].send(t[:property_setter], value)
    end
  end

  @tagged_for_deletion.each do |to_delete|
    @transformations.delete(to_delete)
  end.clear
end