Inspiring

Answered

Why is the startDrag() lag so choppy?

Forum|Forum|14 years ago
September 12, 2011
4 replies
2693 views

I have tried increasing the frame rate, it doesn't help.

I am compiling using AIR for iOS and running on a first generation iPad.

I have simple movie clips that get dragged around the screen. No memory hogs, it's just a little kid's game. And yet startDrag() and startTouchDrag() are really choppy. It's like dragging on one of those old 1 frame per second machines. My finger will land and .75-1 second later the Sprite will catch up. 1 second is a long, long time in a user interface. Other similar apps (not written in Actionscript) have smooth, silky drag functions. Even my 3 year old daughter notices how bad the lag is.

Is this just an AIR compiler problem, or am I doing something wrong?

Development

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Correct answer Colin Holgate

Yes, dragging textfields is demanding enough, but at least against a bitmap it wouldn't have to re-render the background part every frame. You could try setting the cacheasbitmap of the vector symbol to true. That could speed things up.

J

joeboy_uk

Inspiring

do you have other things going on at the same time? I found that if I had vector text on the stage my drag would be choppy.

A

AmbariAuthor

Inspiring

Yes - actually the movie clip being dragged is nothing but dynamic text (I changed this from when I wrote earlier saying they were simple graphics. I had to make them dynamic. It didn't effect the drag). But that's the only thing going on.

But I have other apps where I drag dynamic text around and it works just fine.

Is there a setting in fonts embedding or something like that that would make it better?

(Hm, I just thought of this...in my other apps the dynamic text is being dragged over a bitmap and in this one it's being dragged over a vector. Would that make a difference?)

Colin HolgateCorrect answer

Inspiring

Yes, dragging textfields is demanding enough, but at least against a bitmap it wouldn't have to re-render the background part every frame. You could try setting the cacheasbitmap of the vector symbol to true. That could speed things up.

J

johnstejskal

Participant

set it to GPU mode in the app.xml

I had the same problems when running on CPU mode

A

AmbariAuthor

Inspiring

GPU mode made it way, way, way worse.

Any other ideas?

A

AmbariAuthor

Inspiring

I'm running CS 5.5 and Air 2.6. How do I upgrade to 2.7? Will that fix it?

My code is this.startDrag(); and this.stopDrag();

S

sanika Kulshreshtha

Participating Frequently

Hi,

You can download AIR 2.7 from here and overlay it with CS 5.5 using the instructions at this page. You could also download the AIR 3 RC build from labs and give it a try. If you still see an issue, please file bug.

Thanks,

Sanika

S

smitchell94

Inspiring

Hmm, i was developing a Iphone app a while ago. Was coding in the timelime like a noob. And i had the same problem. I was scrolling content mimicing the IOS scrolling with easing. And it was disgusting when put on a device.

I realised it was bad becuase there was animation happening. I had a twitter bird flying, on the stage at the time, but various animations through out the app.

Including a animation of a 3D motorbike rotating. With was something like 300 jpegs. So from experience i can say smooth scrolling does not like a library full of animation. It has more to load i guess.

A

AmbariAuthor

Inspiring

I've got nothing else on the screen. The movie clips are nothing more than static graphics that have only been turned into movie clips to make them draggable. There's no other animations or anything on the screen. What else could be causing it?

S

smitchell94

Inspiring

Hmm, not sure exactly. Maybe its because you are using the old IOS template. You need the updates. But i think i know why you do not have it

What Code are you using for your drag?

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