Starling Forum

1. 

   wmwilson
   

   Novice Bird
   Joined: Dec '11
   Posts: 16

   I'm having a tough time getting a sprite to smoothly travel across the screen.
   Basically I'm moving an object down the screen by the following code in the advanceTime method:

   sprite.y += passedTime * spriteSpeed;

   I'm testing on an iPad, iPhone 4, and iPhone 3GS. I get fairly good fps, 47, 39, and 33 respectively, but there are periods where the scrolling sputters as if the passedTime is going long. I'm not doing anything (like creating new objects) that should cause a delay.
   It's better on the debugger, but on the device sometimes there is a delay of as much as 0.5 seconds.
   Has any one run into this problem? Any ideas on how to avoid these delays?

   Posted 1 year ago #
2. 

   ctp2nd
   

   Novice Bird
   Joined: Feb '12
   Posts: 8

   I'd try something like this:

   private function moveSprite():void {
   	sprite.y += .1*speed;
   	Starling.juggler.delayCall(moveSprite,.001);
   }

   its incredibly smooth on my iPhone4S

   Posted 1 year ago #
3. 

   wmwilson
   

   Novice Bird
   Joined: Dec '11
   Posts: 16

   @ctp2nd, thanks for the suggestion. Unfortunately I'm still getting the same hiccups. It runs smooth for a few minutes, then rough for 30 seconds or so, then smooth...

   Posted 1 year ago #
4. 

   chrisgannon
   

   Competent Bird
   Joined: Feb '12
   Posts: 42

   I don't think you need to add it to the juggler if it's not an animating MC, particle or native Tween.

   I would suggest you use the Greensock animation platform for animations. I use this and I'm getting 60fps with scrolling backgrounds, particles and movieclips all at the same time.

   Also are you using a stats counter? If you are and it's not using bitmap fonts then this could also be causing a problem.

   Posted 1 year ago #
5. 

   sHTiF
   

   Moderating Owl
   Joined: Oct '11
   Posts: 827

   Personally I use Greensock as well its not the fastest out there but it is damn near and its really robust.

   But from what you are experiencing I am positive there some GC going on, did you profile it?

   Posted 1 year ago #
6. 

   chrisgannon
   

   Competent Bird
   Joined: Feb '12
   Posts: 42

   @sHTiF What do you think IS the fastest tweener, out of curiosity?

   Posted 1 year ago #
7. 

   wmwilson
   

   Novice Bird
   Joined: Dec '11
   Posts: 16

   @chrisgannon: Even with the stats counter turned off I get the same thing. I'll check out Greensock, I looked at it before but didn't know I could use it with Starling. If if you don't use the juggler do you use an EnterFrame event, or is it taken care of by Greensock?

   @sHTiF I haven't profiled it, still not sure exactly how. Stupid question, what's GC?

   Thanks for your help, I appreciate it!

   Posted 1 year ago #
8. 

   chrisgannon
   

   Competent Bird
   Joined: Feb '12
   Posts: 42

   Yeah Greensock works with values and is framework agnostic.

   What sHTiF is referring to is Garbage Collection - I too find it confusing when people use obfuscating acronyms

   Posted 1 year ago #
9. 

   sHTiF
   

   Moderating Owl
   Joined: Oct '11
   Posts: 827

   @wmwilson yea GC is Garbage Collection and its pretty know acronym Just profile using Flash Builder or some free platform if you don't have FB premium.

   @chrisgannon I did tests with all tweeners in many projects and fastest out there is Actuate in any benchmark I threw at it. But I like Greensock and all its capabilities way too much

   Posted 1 year ago #
10. 

    wmwilson
    

    Novice Bird
    Joined: Dec '11
    Posts: 16

    Garbage Collection, I should have known that, thanks

    Posted 1 year ago #
11. 

    wmwilson
    

    Novice Bird
    Joined: Dec '11
    Posts: 16

    Light bulb!
    I'm using some soundEFX during the animation. Creating sounds could cause the need for some GC, correct? Whats the best way to use soundEFX so as to avoid GC?

    Posted 1 year ago #
12. 

    chrisgannon
    

    Competent Bird
    Joined: Feb '12
    Posts: 42

    Object pooling your sounds could help if you're using the same one over and over again (to avoid making 'new' ones every time).

    Posted 1 year ago #
13. 

    wmwilson
    

    Novice Bird
    Joined: Dec '11
    Posts: 16

    Cool. Thanks again.

    Posted 1 year ago #
14. 

    sHTiF
    

    Moderating Owl
    Joined: Oct '11
    Posts: 827

    On mobiles you should pool everything there should be no new SomeClass(...) anywhere in your code that runs over and over.

    Posted 1 year ago #
15. 

    wmwilson
    

    Novice Bird
    Joined: Dec '11
    Posts: 16

    Would you suggest something like Loan Shark http://code.google.com/p/loanshark/ or just building your own?

    Posted 1 year ago #
16. 

    chrisgannon
    

    Competent Bird
    Joined: Feb '12
    Posts: 42

    Loan shark is a bit bloated and unnecessary IMO. I actually created and use a more generic version of the one Adobe uses in the Flash help files.

    Posted 1 year ago #

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