Issues with background coordinate configuration in objective c with runAction? - ios

Question

in my game i have two backgrounds going one after the other creating a continuous loop moving to the left.
However, right now one goes, and the other does not follow it.
I have relentlessly tried different numbers but nothing seems to help.
Thank you for whatever help you can give to me.
if((self = [super init]))
{
self.isTouchEnabled = YES;
background=[CCSprite spriteWithFile:#"testbackground88.png"];
[self addChild:background z:1];
background.position=ccp(500,240);
id repeat1 =[CCRepeatForever actionWithAction:[CCSequence actions:
[CCMoveTo actionWithDuration:7 position:ccp(-300,240)],
[CCPlace actionWithPosition:ccp(800,240)],nil]];
[background runAction:repeat1];
background2=[CCSprite spriteWithFile:#"testbackground92.png"];
[self addChild:background2 z:1];
background2.position=ccp(500,240);
id repeat2 =[CCRepeatForever actionWithAction:[CCSequence actions:
[CCMoveTo actionWithDuration:7 position:ccp(-300,240)],
[CCPlace actionWithPosition:ccp(800,240)],nil]];
[background2 runAction:repeat2];
}

Answer 1

if((self = [super init]))
{
self.isTouchEnabled = YES;
//add an empty container sprite in 0,0 pos
CCSprite container = [CCSprite node];
[self addChild:container];
// get the screen size and use it for positioning
CGSize scrSize = [[CCDirector sharedDirector] winSize];
// add the sprites to the container
background =[CCSprite spriteWithFile:#"testbackground88.png"];
background2 =[CCSprite spriteWithFile:#"testbackground92.png"];
[container addChild:background z:1];
[container addChild:background2 z:1];
// use the background's widths to define it's in between distance.
int bgDist = ( background2.contentSize.width + background.contentSize.width) / 2;
// the container's total travel;
int containerTravel = ( background.contentSize.width + background2.contentSize.width)/2 ;
background.position =ccp(scrSize.width/2, scrSize.height/2);
background2.position =ccp( (scrSize.width/2 + bgDist), scrSize.height/2);
// move the container
CCRepeatForever loopBgTravel =[CCRepeatForever actionWithAction:[CCSequence actions:
[CCMoveTo actionWithDuration:0 position:ccp(0,0)],
[CCMoveTo actionWithDuration:7 position:ccp(-containerTravel,0)]];
[container runAction:loopBgTravel];
}
Feel free to ask again if this isn't working

Answer 2

the way you did that, you should always see bg2 over bg, as they move in the same exact position each time.
for example, if you want background2 placed on the right next to background 1, you can do something like
background2=[CCSprite spriteWithFile:#"testbackground92.png"];
[self addChild:background2 z:1];
int bgWidth = background2.contentSize.width;
background2.position=ccp(500 + bgWidth ,240);
id repeat2 =[CCRepeatForever actionWithAction:[CCSequence actions:
[CCMoveTo actionWithDuration:7 position:ccp( (-300 + bgWidth) ,240)],
[CCPlace actionWithPosition:ccp((800 + bgWidth ),240)],nil]];
It would be even better to add both sprites in a container Sprite, one next to each other, and perform the move actions on the container