Repeating Image Animation

Getting Started Newbie Questions
1

I have an image that I want to grow and shrink. I’ve gotten this far with the code:

 transition.to( cat1, { time=2000, x=417, y=619, alpha=1, delay=0, transition= easing.linear, xScale =2, yScale = 2, rotation = 0 })   
 local myclosure\_cat1 = function() transition.to(cat1, {time=1000, x = 417, y=619, alpha=1, delay=0, transition= easing.linear, xScale=1, yScale=1, rotation=0 }) end  
 timer.performWithDelay(500, myclosure\_cat1, 1)

This makes it grow and shrink once. How do I make it grow / shrink forever?

Demetrius
[import]uid: 1380 topic_id: 12249 reply_id: 312249[/import]

2

I did something like this and it works:

local function repeatGrow (event)  
 transition.to( cat1, { time=500, x=417, y=619, alpha=1, delay=0, transition= easing.linear, xScale =2, yScale = 2, rotation = 0 })  
 local myclosure\_cat1 = function() transition.to(cat1, {time=500, x = 417, y=619, alpha=1, delay=0, transition= easing.linear, xScale=1, yScale=1, rotation=0 }) end  
 timer.performWithDelay(500, myclosure\_cat1, 1)  
end  
  
-- Grow image every second (0 = infinity) using transition.to()  
timer.performWithDelay(1000, repeatGrow, 0 )

I used that fade in and out transition example to achieve this.
Demetrius
[import]uid: 1380 topic_id: 12249 reply_id: 44621[/import]

3

Wouldn’t this recursive call create infinite timers? and if that so that means that it will crash your app, isn’t it?
[import]uid: 12407 topic_id: 12249 reply_id: 44622[/import]

4

I don’t know. I’m sure there’s a better way of doing it.
That’s why I posted the code hoping that someone would suggest
a better solution.

If you know of a better way please tell me.

Demetrius [import]uid: 1380 topic_id: 12249 reply_id: 44625[/import]

5

how about calling them from one another?

[lua]local Call_trans1,Call_trans2
function Call_trans1()
transition.to(obj1, …,onComplete=Call_trans2}
end

function Call_trans2()
transition.to(obj1, …,onComplete=Call_trans1}
end

Call_trans1()[/lua]

or if you want it to just grow forever, (which seems a bit strange but whatever you want to do)
[lua]local theScale=1
local growIt

local function growBy10Pecrent()
theScale = theScale * 1.1
growIt(theScale)
end

function growIt(toThisScale)
transition.to(obj1,{…toThisScale,onComplete=growBy10Percent})
end

growIt(theScale)[/lua]

cheers,

?:slight_smile: [import]uid: 3826 topic_id: 12249 reply_id: 44630[/import]

6

I’ll try these. Thanks for the help.

Demetrius
[import]uid: 1380 topic_id: 12249 reply_id: 44631[/import]

7

I tried to do the same with parameters but it lead to error :

local Call\_trans1,Call\_trans2  
   
function Call\_trans1(duration)  
 transition.to(obj1, {time=duration,...,onComplete=Call\_trans2(1000)})  
end  
   
function Call\_trans2(duration)  
 transition.to(obj1, {time=duration,...,onComplete=Call\_trans1(1000)})  
end  
   
Call\_trans1(1000)

Any hints ? [import]uid: 9328 topic_id: 12249 reply_id: 58584[/import]

8

because you cannot pass parameters the way you did.

use

... onComplete = function() Call\_trans2(1000) end})

and

... onComplete = function() Call\_trans1(1000) end})

what you are doing is passing the *Value* of the function rather than pass the function.

cheers,

?:slight_smile: [import]uid: 3826 topic_id: 12249 reply_id: 58585[/import]

9

Oops…
Thx for your blazing fast answer :)) [import]uid: 9328 topic_id: 12249 reply_id: 58587[/import]