cocos2d for iPhone

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

1. 

   quano
   Member

   Maybe I got this wrong, but afaik it's only Layers that get the touch events. So, how's a good way to detect if a user is tapping or dragging a specific sprite?

   Posted 2 years ago #
2. 

   Clain
   Member

   In old versions of cocos, only Layers got the touch events. But now there's a TouchDispatcher that lets you detect a touch on a specific Sprite. Look at the "TouchesTest" demo in the examples that come with cocos 0.8. Paddle.h/.m is where you want to look.

   Posted 2 years ago #
3. 

   Osiris
   Member

   how is TouchDispatcher different from ccTouchBegan: / ccTouchMoved: ?

   i'm touching sprites (I think) and not using the TouchDispatcher.

   Please be gentle, I still dont understand most of this stuff.

   Posted 2 years ago #
4. 

   quano
   Member

   Ah, the Paddle conforms to the TargetedTouchDelegate protocol, and registers itself as an object that handles touches in onEnter:

   [[TouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];

   Posted 2 years ago #
5. 

   quano
   Member

   Hm, looking further into this, I realized that it isn't the the TargetedTouchHandler that checks whether or not the touch was inside the sprite, but rather the sprite itself. See this in paddle.m:

   - (BOOL)containsTouchLocation:(UITouch *)touch
   {
   return CGRectContainsPoint(self.rect, [self convertTouchToNodeSpaceAR:touch]);
   }

   - (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
   {
   if (state != kPaddleStateUngrabbed) return NO;
   if ( ![self containsTouchLocation:touch] ) return NO;

   state = kPaddleStateGrabbed;
   return YES;
   }

   So even though you conform to the protocol and add it as a targeted delegate, you'll probably still get events even though they were outside your sprite. Am I right?

   Posted 2 years ago #
6. 

   sserye
   Member

   Does this code apply for a round shape??

   Posted 2 years ago #
7. 

   quano
   Member

   From what I understand, it does not. Maybe there's something like CGRectContainsPoint but for circles. Not sitting at mac now so cannot check.

   Posted 2 years ago #

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