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Gtween glitch? — Gideros Forum
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    Gtween glitch?

    DafbDafb Member
    in General questions
    Hello

    I used a tween to move a movieclip. The tween is generated on touch.

    Everything works great as long as I am gentle, and don't click/touch too fast. When I go fast (like I expect a player to be), I get some glitches: most often it is a teleport instead of a smooth animation.

    Here is my code:
    local function followTween(ship, event)
 
	local xship, yship = ship:getPosition()
 
	print ("Ship: ", xship," x ", yship)
	--print(ship:getPosition())
	print ("touch!")
	local x = event.touch.x
	local y = event.touch.y
	print (x," x ", y)
 
	-- constant speed
	local dist = math.sqrt((xship-x)^2+(yship-y)^2) 
	local speed = 400
	local duration = dist/speed	
	-- gtween props
	local animate ={}
	animate.x = x
	animate.y = y
	local properties = {}
	properties.delay = 0
	properties.ease = easing.linear
	-- gtween call
	local tween = GTween.new(ship, duration, animate, properties)
 
end
    This function is called via
    mapb:addEventListener(Event.TOUCHES_END, followTween, rmship)
    I am a beginner so I guess my code might be lacking some useful subtleties. What should I do?
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    Comments

    • hgy29hgy29 Maintainer
      I think you need to cancel the previous tween if it wasn't complete when the player touches the screen again, otherwise both tweens will be running concurrently for a while
      +1 -1Share on Facebook
    • rrraptorrrraptor Member
      edited June 2020
      Instead of creating new GTween instance every time, you can reuse the old one like that:
      local function NULL() end
-- t (table):
--	duration, values, ease, callback
function Sprite:animate(t)
	t.duration = t.duration or 0
	t.ease = t.ease or easing.linear
	t.callback = t.callback or NULL
 
	if (self.gt) then 
		self.gt.duration = t.duration
		self.gt.ease = t.ease
		self.gt:setValues(t.values)
	else
		self.gt = GTween.new(self, t.duration, t.values, {ease = t.ease})
		self.gt:addEventListener("complete", t.callback, self)
	end
	self.gt:setPosition(0)
	self.gt:setPaused(false)
end
      SuperShape | Nice blured shapes with shadows | Simple button pad | Simple layer class | Simple UI library | 2D camera lib | Color picker | FPS graph | Dear ImGui | cute_c2
      +1 -1Share on Facebook
    • DafbDafb Member
      Thank you so much!

      Likes: MoKaLux

      +1 -1 (+1 / -0 )Share on Facebook
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