cocos2d for iPhone

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

1. 

   RAGOpoR
   Member

   Hello, i'm new to cocos2d, i need help about how to detect that a sprite1 move to hit a sprite2 and make some event (eg, BOOM effect, play sound)

   i found some information that advise to use CGRectIntersectsRect
   but i can't make it work, could you advise me please, Thanks you for all reply

   my code

   CGSize size = [[Director sharedDirector] winSize];
   id move = [MoveBy actionWithDuration:3 position:ccp(350,0)];
   id move_back = [move reverse];
   id seq1 = [Sequence actions: move, move_back, nil];
   Sprite *spritemove = [Sprite spriteWithFile:@"Icon.png"];
   spritemove.position = ccp(50 , 280);
   [self addChild:spritemove z:4 tag:kTagSpritemove];
   [spritemove runAction:[RepeatForever actionWithAction:seq1]];

   Sprite *sprite = [Sprite spriteWithFile:@"Icon.png"];
   sprite.position = ccp(0 , 0);
   [self addChild:sprite z:4 tag:kTagSpriteShoot];
   id shootobj = [MoveTo actionWithDuration:0.3 position:ccp(size.width,size.height)];
   [sprite runAction:shootobj];

   Posted 2 years ago #
2. 

   pabloruiz55
   Member

   Well... that code you posted does not show anything regarding collision...
   Basically what you would do to check collision between 2 rects is creating a cgrect for those 2 sprites and each update call, do CGRectIntersectsRect(object1.rect,object2.rect).

   Why couldn't you make that work? Does it give you an error? Please post the code regarding the collision that does not work.

   Posted 2 years ago #
3. 

   RAGOpoR
   Member

   thanks pabloruiz55

   I will try to create CGRect for my sprite first,

   Posted 2 years ago #
4. 

   RAGOpoR
   Member

   here is my code after insert CGRect for sprite is it correct?

   CGSize size = [[Director sharedDirector] winSize];

   id move = [MoveBy actionWithDuration:3 position:ccp(350,0)];
   id move_back = [move reverse];
   id seq1 = [Sequence actions: move, move_back, nil];

   Sprite *spritemove = [Sprite spriteWithFile:@"Icon.png"];
   spritemove.position = ccp(50 , 280);
   CGRect rectmove = CGRectMake(spritemove.position.x - (spritemove.width/2), spritemove.position.y - (spritemove.height/2), spritemove.width , spritemove.height);
   [self addChild:spritemove z:4 tag:kTagSpritemove];
   [spritemove runAction:[RepeatForever actionWithAction:seq1]];

   Sprite *sprite = [Sprite spriteWithFile:@"Icon.png"];
   sprite.position = ccp(0 , 0);
   CGRect rect = CGRectMake(sprite.position.x - (sprite.width/2), sprite.position.y - (sprite.height/2), sprite.width , sprite.height);
   [self addChild:sprite z:4 tag:kTagSpriteShoot];
   id shootobj = [MoveTo actionWithDuration:0.3 position:ccp(size.width,size.height)];
   [sprite runAction:shootobj];

   if(CGRectIntersectsRect(rectmove,rect))
   [[SimpleAudioEngine sharedEngine] playEffect:@"chicken.wav"];

   and i am not sure where is update call(update on touch screen or we call it manual) to check CGRectIntersectsRect

   Posted 2 years ago #
5. 

   RAGOpoR
   Member

   i have an error about sprite.width and sprite.height
   how to get size of my sprite?

   my concept about how to detect collision
   i think
   1. create rect for sprite (i'm not sure how to create it, just find an example and try)
   2. use CGRectIntersectsRect to detect it (where is the best place for check CGRectIntersectsRect, i think when sprite move)

   i think i miss understand about true concept of collision detection,
   could you please advise me about tutorial example or code for me

   Posted 2 years ago #
6. 

   RAGOpoR
   Member

   now i use this code and it report warning and error

   /Users/ragopor/Desktop/test 3/Classes/HelloWorldScene.m:351: warning: 'Sprite' may not respond to '-rect'

   /Users/ragopor/Desktop/test 3/Classes/HelloWorldScene.m:351: error: incompatible type for argument 1 of 'CGRectIntersectsRect'
   /Users/ragopor/Desktop/test 3/Classes/HelloWorldScene.m:351: error: incompatible type for argument 2 of 'CGRectIntersectsRect'

   if(CGRectIntersectsRect([spritemove rect],[sprite rect])){
   //make event
   }
   .
   .
   .
   -(CGRect) rect {
   float x = [self position].x;
   float y = [self position].y;
   float h = [self contentSize].height;
   float w = [self contentSize].width;
   CGRect aRect = CGRectMake(x,y,w,h);

   return aRect;
   }

   Posted 2 years ago #
7. 

   akaii
   Member

   The code fails because Sprite has no rect property or method. Why are you trying to call a non-existent method? Shouldn't you be passing the rectMove and rect CGRect structs you declared to CGRectIntersectsRect?

   Posted 2 years ago #
8. 

   RAGOpoR
   Member

   thanks for your advise akaii

   i will try

   Posted 2 years ago #
9. 

   RAGOpoR
   Member

   thanks for your advise akaii

   i will try

   Posted 2 years ago #
10. 

    RAGOpoR
    Member

    sorry for multiple post, my internet connection have a problem

    Posted 2 years ago #

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