How to constantly pulsate between two values?

Comments

• keszegh Member

  December 2014 edited December 2014

  i do something like that:
  suppose that at the beginning the alpha is 1. then this will pulsate:
  
  function startPulsate(sprite)
  sprite.tween=GTween.new(sprite, 0.5, {alpha=0}, {ease = easing.linear,reflect=true,repeatCount=0})
  end
  
  function stopPulsate(sprite)
  if sprite.tween then sprite.tween:stopAll() end
  sprite.tween=nil
  end
  

  Longtitle Productions, creator of
  Fragmenter - animated loop machine and IKONOMIKON - the memory game

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• keszegh Member

  December 2014 Accepted Answer

  or perhaps this is more efficient but i did not test it:
  
  function startPulsate(sprite)
  if not sprite.tween then sprite.tween=GTween.new(sprite, 0.5, {alpha=0}, {ease = easing.linear,reflect=true,repeatCount=0})
  else sprite.tween:setPaused(false)
  end
  end
  
  function stopPulsate(sprite)
  if sprite.tween then sprite.tween:setPaused(true) end
  end

  Longtitle Productions, creator of
  Fragmenter - animated loop machine and IKONOMIKON - the memory game

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• seppsepp Member

  December 2014

  Ah, cool, reflect plus count = 0 does the thing. Nice. Thanks for you help.
  
  Btw: I clean up the tween after it ended. Just because I read somewhere, that Gtween holds a reference to the sprite and it doesn't feel to good to me...

  Soledad - Charity Game | Birds and Trees

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• keszegh Member

  December 2014

  i wonder if a sprite references its tween and the tween references the sprite, but they are not onscreen and nothing else references them, will they be ever garbage collected?
  also, does it matter if the tween is paused or not?
  

  Longtitle Productions, creator of
  Fragmenter - animated loop machine and IKONOMIKON - the memory game

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• seppsepp Member

  December 2014

  Hm. GTween:init at least stores a reference to the target ...

  Soledad - Charity Game | Birds and Trees

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