A fast, easy to use, free, and community supported 2D game engine
rhodesy22
Member
Hey all,
I have a project with a scrolling background. The project is running at 60fps, but when I run it either in the simulator or the iphone 3G S, it doesn't feel smooth.
I've put the project up at http://geniewebltd.com/Demo.zip - just containing the scrolling background.
If anyone can help it would be much appreciated.
Thanks!
freshworks
Member
Hi,
Ive downloaded the project and played with it a little. My knowledge of cocos2d is very few, but iv'e tried a 32x32 png image and the framerate was up to 60.
Probaly the png you are using is to big, to much memory usage or probaly you need to use a square vertex or something instead of a matrix, as i said, to few knowledge of cocos2d
Good luck
Cheers,
Jespar
Steve Oldmeadow
Administrator
It looked fine on a 3gs to me. Can you explain better what the problem is? Have you run it on another device type where it looks smooth?
Kahless
Member
@i.jameelkhan
Someone posted a code example showing both vertical and horizontal scrolling with this method here.
http://www.cocos2d-iphone.org/forum/topic/713#post-7637
I also found the scrolling is alot smoother if you change your interval in the draw schedule to something like
[self schedule: @selector(drawSchedule:) interval:1.0/120];
and this post talks about how to make seamless looping backgrounds for scrolling
http://www.codza.com/making-seamless-repeating-backgrounds-photoshop-cocos2d-iphone
Blue Ether
Member
I'm a tad confused why you're posting what is essentially an opengl question to the cocos2d forum. Your scrolling method is pure opengl- there's pretty much nothing cocos2d about it.
My game scrolls seamlessly at 60fps even at extremely high or extremely low speeds using pure cocos2d methods. What I did was to make my background an AtlasSpriteManager, then slice the texture up into an array of equal sized strips, each corresponding to an AtlasSprite. I then overrode the setPosition function of the layer and added a function that positions the strips correctly so that they are constantly following and staying in the viewable area. As the camera moves left to right, the leftmost strip will keep getting repositioned forward an amount equal to (number of strips * width of a strip), and vice-versa for scrolling in the opposite direction. I can vary the background as if it were tiled by repositioning the source rect of the AtlasSprite when it is moved.
You must log in to post.
