How to scroll the background screen continuously from top to bottom

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How to scroll the background screen continuously from top to bottom

(65 posts) (29 voices)

Started 2 years ago by Swathi
Latest reply from CoopToons

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Shafijami
Member

First this is my apologies to all whom my last question caused any inconvenience!

Now @jd
If I stuck at some point... I'll try to do things in other ways... and once got the expected result I'll move for next. If result is unexpected after few trials even then I'll prefer to move towards rest of the things need to be done to maintain the process. But all time I'll be keen to know how those things can be done in smarter ways... not just for getting the result by hook or by crook. Any way this my way of occupation concern. And I'm sure every programmer has his/her own way of occupations concern. Also I never heard such definitions for a programmer and developer!

Thus far I've been part of this blog, for 3 times for asking any help. First 4 months ago, 2 days back and last on yesterday. My first time asked questions was not been answered and so I moved to other blogs where several times I asked almost same questions. A few people have tried to helped me out in the ways I've already tried and not been satisfied by the result. So I moved back to this blog and once agin asked the question. So the ANNOYED was not for you people or others (from other blogs) but for SITUATION I was facing. Thats it.

@abitofcode
Thanks for help. I'm sure this will work fro me in some way.... thanks

@Lam
I'm really sorry for all from my side that cause any inconvenience to you people. You and riq are the lives of this blog. I really don't meant that for you people. I'm just sharing my experience for other blogs and the situation I was struggling with.

And lastly I withdraw with my questions asked 1 day back.

Posted 1 year ago #
finklebottom
Member

@Lam
First off thank you very much for the help. To your code I added the CCRepeatForever:
CCAction *action = [CCRepeatForever actionWithAction:[CCTextureMoveBy actionWithDuration:20.f position:ccp(10,0)]];

And I commented out the ccTouchesBegan.

When I run the code on my iPod and leave it for 2 or 3 minutes the image gets distorted/pixelated and it gets worst and worst over time.

Does this happen for you?

Thanks again for the help!

Posted 1 year ago #
Lam
Member

@finklebottom
I've checked the issue and yeah that does seem to happen for larger values when we repeat.

Since we're using a moveby we can see that the position of the texture will probably be extremely large and those large operations tend to pixelate the texture.

How you can combat this is to reset the actual texture position to the origin position after some number of repeats. For every cycle of the texture (0.f.. 1.f) we'll really repeat the same texture from the beginning so we can use TextureMoveTo to reset the position or just manually reset to a CGPointZero.

Posted 1 year ago #
finklebottom
Member

@Lam
Thanks very much for the response and the help.

I played around with your suggestion and think it is working. In your sample code, I altered the init/actions area to be:

// run an action for TTexture @see TTexture.h for info
CCAction *action_1 = [CCRepeat actionWithAction:[CCTextureMoveBy actionWithDuration:2.0f position:ccp(ttexture_.contentSize.height-1,0)] times:1];

CCAction *action_2 = [CCTextureMoveTo actionWithDuration:0.f position:CGPointZero];

CCAction *action = [CCRepeatForever actionWithAction:[CCSequence actions:action_1,action_2,nil]];

action.tag = kTextureAction;

[ttexture_ runAction:action];

I am not sure if it is there is a more efficient solution, but it looks good to me. I let the sucker run for about 5 minutes and don't see any pixelating like before. :)

Thanks!!

Posted 1 year ago #
CoopToons
Member

I am in the process of learning Cocos2d and this is a great thread. I have one question. If you do a repeat forever for the background, how can you stop if from moving when the character stop walking and then start it up again when he starts walking again?

Posted 1 year ago #

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