cocos2d for iPhone

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

1. 

   SDKTutor
   Member

   I am trying to detect a collision between two sprites and am using this code:
   CCNode *sprite = [self getChildByTag:kTagBall];
   CCNode *enemy = [self getChildByTag:kTagEnemy];
   if (CGRectIntersectsRect(sprite.frame, enemy.frame)) {
   //Do something
   }

   When I build it, it says there is no such property called frame. What is the cocos2d equivalent to this set of code?

   Posted 2 years ago #
2. 

   edisonslabs
   Member

   Cocos2d API is completely different from UIKit API.

   The closest thing you'll probably find is:

   if(CGRectIntersectRect([sprite boundingBox], [enemy boundingBox])) {
   ...
   }

   Though I'm not sure whether the CCNode bounding box has the position offset calculated in it as well.

   Posted 2 years ago #
3. 

   SDKTutor
   Member

   Thanks! It works but I found out another way that's more accurate with circles but does same job.

   Posted 2 years ago #
4. 

   edisonslabs
   Member

   Nice, perhaps you would want to give a sample here for others to reference :)

   Posted 2 years ago #
5. 

   SDKTutor
   Member

   Sure thing. What I used was this:
   float xdif = enemy.position.x - sprite.position.x;
   float ydif = enemy.position.y - sprite.position.y;
   float distance = sqrt(xdif*xdif+ydif*ydif);
   if (distance < enemyRadius + spriteRadius) {
   // your code here
   }

   Posted 2 years ago #

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