Class: CheekyPi::Animation::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/cheeky-pi/animation/base.rb

Direct Known Subclasses

Cycle, Fade

Constant Summary collapse

TICKRATE = 
0.033

Instance Method Summary collapse

Constructor Details

#initialize(duration, light, options = {}) ⇒ Base

Returns a new instance of Base.



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# File 'lib/cheeky-pi/animation/base.rb', line 11

def initialize(duration, light, options={})
  @duration = duration
  @light = light

  @deferred = EventMachine::Q.defer
  promise.then { handle_complete }

  start
end

Instance Method Details

#animate ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 64

def animate
end

#complete ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 52

def complete
  @timer.cancel
  @deferred.resolve

  self
end

#halt ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 45

def halt
  @timer.cancel
  @deferred.reject

  self
end

#handle_complete ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 21

def handle_complete
end

#percent ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 36

def percent
  return 0 if @duration.nil?
  (Time.now.to_f - @start_time) / @duration
end

#promise ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 24

def promise
  @promise ||= @deferred.promise
end

#safe_percent ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 41

def safe_percent
  [percent, 1].min
end

#sine(percent) ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 72

def sine(percent)
  Math::sin(percent *  2 * Math::PI - 0.5 * Math::PI) * 0.5 + 0.5
end

#start ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 28

def start
  @timer.cancel if @timer
  @start_time = Time.now.to_f
  @timer = EventMachine.add_periodic_timer(TICKRATE) { tick }

  self
end

#tick ⇒ Object 



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# File 'lib/cheeky-pi/animation/base.rb', line 59

def tick
  complete if percent >=1
  animate
end

#triangle(percent) ⇒ Object

convert [0-0.5-1] to [0-1-0]



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# File 'lib/cheeky-pi/animation/base.rb', line 68

def triangle(percent)
  (0.5 - (percent % 1 - 0.5).abs) * 2
end