Some questions about animating using Gtween

zoolax

Hi
when I were using c*sdk for animation I do :

local tr
tr= transion.to(obj,{x=2,y=2,alpha=0,transtion=easing.inExpo,onComplete= some function})

later to remove it from the memory :

transition.cancel(tr)

Even if you are not familier with c*sdk,
I think you know what I mean.

I tried to find Gtween use in gideros reference manual,I did not.
A.Can you give me an exaple how to translate the above code,or a link to an example,I searched the foroums ,I could not find exatly what I were looking for.

B.and should I require(`Gtween`) and where can I find it
Thanks

OZApps

Gtween can be found on Github as it is not part of the Gideros native API. Gtween might look a bit more involved but is more powerful than the transitions as it can allow for looping and reversal. So you can actually have an item swing from left to right and then back from right to left.

the link for GTween is https://github.com/gideros/GTween

zoolax

Thanks,I have used gtween.lua for C*sdk before.
I liked it back then,
Is there any way to call a function on the completion of the animation or before it begins?

I have already test it in Gideros,I am more concern how can I call another function after
it is done using movie clip or Gtween.

OZApps

yes you can set callbacks for three stages, onStart, onComplete and onChange (which is every tween step) For that you have to set the dispatchEvents to true and addListeners for the Events with a function.

The events are "complete", "init" and "change" you will need to addEventListener on the Tween object that you create with new.

ar2rsawseen

Here are some examples and description on GTween
http://appcodingeasy.com/Gideros-Mobile/Gideros-GTween-with-easing

john26

Also there is a GTween code example included in the Gideros distribution. In my version its in the "Examples/Graphics" directory.

GTween.new is basically identical to Corona's transition.to. If you want to do transition.from, there is a swapValues flag. There is no explicit transition.cancel function. Instead you pause the GTween and it will automatically be garbage collected when its target is collected.

There doesn't seem to be any official documentation so I just looked at the gtween.lua source code -- which is not very long.

zoolax

Thanks
I found some simple samples,I have no problem figuring out the easing function and other things.
I wanted to figure out the call back functions for Gtween and movieclip ,and how they work?
Just a simple line of code would do:)
Thanks

ar2rsawseen

Have you checked the article I've mentioned?

Here's an example:

--define what to animate local animate = {} animate.y = 100 animate.x = 100 animate.alpha = 0.5 animate.scaleX = 0.5 animate.scaleY = 0.5 animate.rotation = math.random(0, 360)   --define GTween properties local properties = {} properties.delay = 0 properties.ease = easing.inElastic properties.dispatchEvents = true   --animate them --- First argument: sprite to animate --- Second argument: duration of animation in seconds or frames --- Third argument: properties to animate --- Fourth argument: GTween properties local tween = GTween.new(sprite, 10, animate, properties)   --adding event on animaiton complete tween:addEventListener("complete", function() stage:removeChild(sprite) sprite = nil end)

zvardin

Does MovieClip have similar events called?

ar2rsawseen

When a MovieClip object finishes it playing (by reaching its final frame or a frame with stop action), it dispatches an Event.COMPLETE event.

So basically yes

zvardin

Doh! Somehow I missed that in the documentation. I even had checked the Event document because I remembered that gave some more specifics. Thanks!

zoolax

Thanks,That will be very handy:)