cocos2d for iPhone

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

1. 

   Ronin180
   Member

   Hi,
   I have a smaller piece of code and I don't fully understand what its doing step by step.
   

   -(void) ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
       UITouch *touch = [touches anyObject];
       CGPoint location = [touch locationInView:[touch view]];
       loc = [[CCDirector sharedDirector] convertToGL:loc];
   }

   I understand that its taking the area where the touch is detected, storing the point in location, and then converting it, but I would like to know more detail about what each part is doing.

   Thanks.

   Posted 7 months ago #
2. 

   CJ
   Moderator

   1. First it is getting any touch (to handle multi-touch you'd probably have an easier time using the targeted delegate instead).
   2. The location of the point in the UIView coordinate system (0,0 is at the top left of the screen)
   3. Convert the point to the openGL coordinate system (0,0 is at the bottom left of the screen)

   Posted 7 months ago #
3. 

   Ronin180
   Member

   Thanks, but this is not multi-touch? I thought ccTouchesBegan was for multi-touch and ccTouchBegan was for single-touch.
   Can you help me make this multi-touch? I'm new to cocos2d.

   Posted 7 months ago #
4. 

   phil_me_up
   Member

   This thread might help:

   http://www.cocos2d-iphone.org/forum/topic/17540#post-120637

   Posted 7 months ago #
5. 

   CJ
   Moderator

   I use multiple targeted touch delegates to achieve multi touch without a headache :)

   Posted 7 months ago #
6. 

   Birkemose
   Moderator

   There is a lot of touching going on tonight.

   Targeted ( single touch ), doesnt mean you can not react to multiple fingers on the screen. It means that you can only react to a single touch in that delegate.
   Standard ( multi touch ), means that you can react to several touches in that delegate.

   So if you subclass CCSprite, and implement the targeted touch protocol, each of these subclassed sprites, can react to a single touch.
   You could place two of them on the screen, and move them around simultaneously, even if they used single touch, beacuse each one of them would only have one touch inside them.

   If you, however, wanted to rotate a sprite with two fingers, your would need to use the multi touch protocol.

   Posted 7 months ago #
7. 

   Ronin180
   Member

   @CJ
   Can you show me how to do that?

   @Birkemose
   I'm confused. Are you saying if an object is a subclass of CCSprite, I can press two of them at the same time and it act like multi-touch? Even tho I'm using Targeted touch.

   Sorry if this is obvious, I'm new to cocos2d and Objective-C.

   Posted 7 months ago #
8. 

   Scryb
   Member

   He's saying a targeted touch delegate can only handle one touch, but you can have several target touch delegates active at the same time, which achieves multi-touch behavior. You just can't deal with multi-finger gestures using that technique, since the different delegates aren't aware of each other. You could make them work together of course, but that would just be a lot of unnecessary work when you could just use one standard touch delegate that recognizes the gesture.

   Posted 7 months ago #

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