cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   JavaWizKid
   Member

   for(int i = 0; i < 10; i++)
   {
   [bulletsBuilder addObject: [CCSprite spriteWithFile:@"bullet.png"]];
   }

   if(bulletNumber < 10)
   {
   CCSprite *bul = [bulletsBuilder objectAtIndex:bulletNumber];
   bul.position = ccp(blob.position.x, blob.position.y);
   [self addChild:bul];
   bulletNumber++;
   }

   How do I track certain items in the bulletsBuilder array? I want to check if any of their x positions are larger than say 480.

   Is there a better way to create bullet arrays?

   Thanks.

   Posted 2 years ago #
2. 

   Codemattic
   Moderator

   you can iterate a NSArray easily like this:

   for (CCSprite *aSprite in bulletsBuilder) {
    //do something with aSprite
   }

   You can change CCSprite to any kind of class as long as you are sure that all the objects in bulletsBuilder are of that class or are derived from that class - otherwise you will likely get a *runtime* error.

   Does that help? Or were you asking something else?

   Posted 2 years ago #
3. 

   JavaWizKid
   Member

   I'm not sure what you mean. I have 10 bullets stored in the array. How do I get access to one's coordinates? They are numbered 1-10 say I want to move bullet 5's position, how do I do so? Thanks

   If I do:
   NSLog(@"X: %i",bul.position.x);
   I get a returned value of 0. This is presumably because it doesn't know which of the 10 I'm asking for. How can I get it?

   -----

   I changed it to:

   if(bulletNumber < 10)
   {
   ((CCSprite *)[bulletsBuilder objectAtIndex:bulletNumber]).position = ccp(blob.position.x, blob.position.y);
   [self addChild:((CCSprite *)[bulletsBuilder objectAtIndex:bulletNumber])];
   NSLog(@"X Position %i", ((CCSprite *)[bulletsBuilder objectAtIndex:bulletNumber]).position.x);
   bulletNumber++;
   }

   but the x coord is still 0?

   Posted 2 years ago #
4. 

   Codemattic
   Moderator

   NSLog(@"X: %i",bul.position.x);

   x is a float not an int, try:

   NSLog(@"X: %f",bul.position.x);

   Posted 2 years ago #

RSS feed for this topic

Reply

You must log in to post.