cocos2d for iPhone

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

1. 

   alex
   Member

   Hi
   I'm using cocos2dv.0.7.1 and am slowly learning.
   I have a layer with a sprite that I want to shake/vibrate after it is touched.
   How do I format the code below so it does that?

   @implementation GameLayer
   - (id) init {
   self = [super init];
   if (self != nil) {
   isTouchEnabled = YES;

   Sprite *smileySprite = [Sprite spriteWithFile:@"SmileySprite.png"];
   [plainSprite setPosition:cpv(225, 160)];
   [self addChild:smileySprite z:0];
   }
   return self;
   }
   - (BOOL)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

   (????????????)

   return kEventHandled;
   }
   @end

   I presume this would be added where I've added the question marks. Would it be different in the 0.8 version of cocos2d?

   Once again, bear in mind - I'm such a newb its embarassing :-)

   -alex

   Posted 2 years ago #
2. 

   Cypher
   Member

   [Preface]A fellow noob here, so read with a large grain of salt. :)[/Preface]

   There are actions that can be performed on the sprites, and I'm specifically thinking about the RotateBy and MoveTo actions. I wonder if you can create a sequence that invovles a RotateBy action that rotates by a certain number of degrees on either side and perhaps also MoveTo a few pixels on either side. Do it fast enough and would that show up as a shake?

   I'll need to do something for my own game, so I'm thinking out loud and will hopefully learn how to do as well..

   Posted 2 years ago #
3. 

   alex
   Member

   yeah, I just ahd a peek at the limited documentation and it seems shaky3d would work on a grid (I'm not that far ahead to even know how to do that)...
   so, I'm thinking a sequence of RotateBy and MoveTo would be alright?
   Any ideas how to implement it in my code?

   Posted 2 years ago #
4. 

   patrickC
   Member

   Hey Alex, I don't have much experience when it comes to actions, but I would try this (dirty,unchecked code,wrote it just now):
   

   int rotateAmount = 5;
   int moveAmount = 2;	
   
   id actionShakeRotate = [Sequence actions:
   	[RotateBy actionWithDuration:0.1 angle:rotateAmount],
   	[RotateBy actionWithDuration:0.1 angle:-rotateAmount],
   	[RotateBy actionWithDuration:0.1 angle:rotateAmount],
   	[RotateBy actionWithDuration:0.1 angle:-rotateAmount],
   	[RotateBy actionWithDuration:0.1 angle:rotateAmount],
   	[RotateBy actionWithDuration:0.1 angle:-rotateAmount],
   	[RotateBy actionWithDuration:0.1 angle:rotateAmount],
   	[RotateBy actionWithDuration:0.1 angle:-rotateAmount],
   	nil];
   
   id actionShakeMove = [Sequence actions:
   	[MoveBy actionWithDuration:0.1 position:ccp(moveAmount,0)],
   	[MoveBy actionWithDuration:0.1 position:ccp(-moveAmount,0)],
   	[MoveBy actionWithDuration:0.1 position:ccp(moveAmount,0)],
   	[MoveBy actionWithDuration:0.1 position:ccp(-moveAmount,0)],
   	[MoveBy actionWithDuration:0.1 position:ccp(moveAmount,0)],
   	[MoveBy actionWithDuration:0.1 position:ccp(-moveAmount,0)],
   	[MoveBy actionWithDuration:0.1 position:ccp(moveAmount,0)],
   	[MoveBy actionWithDuration:0.1 position:ccp(-moveAmount,0)],
   	nil];
   
   [sprite runAction:actionShakeRotate];
   [sprite runAction:actionShakeMove];

   What you have there are two action sequences.
   One will rotate it left to right by "rotateAmount" amount, 4 times, with a total duration of 0.8 seconds.
   The other will move it left to right by "moveAmount", 4 times, with a total time of, again, 0.8 seconds.
   If you call them sequentially on the sprite, they should run together, or with such a minimal delay that is not noticeable.
   If you play with those values you should obtain a "shaky" effect on the sprite.

   Also, in your touchesEnded function, you'll want to check which sprite, if any, was touched.
   A quick search on the forum will yield a few discussions regarding the matter.
   Hope that helps,
   cheers
   Patrick

   Posted 2 years ago #
5. 

   natanavra
   Member

   First off, you have the Shaky3D action which is quite kewl.
   second, PatrickC's idea look kinda right to me, but here's a tweak:

   id rotate = [RotateBy actionWithDuration:0.1 angle:10];
   id rotateReverse = [rotate reverse];
   id seq1 = [Sequence actions:rotate, rotateReverse, nil];
   
   id shake = [MoveBy actionWithDuration:0.1 position:cco(5, 0)];
   id shakeReverse = [shake reverse];
   id seq2 = [Sequence actions:shake, shakeReverse, nil];
   
   id spawner = [Spawn actions:seq1, seq2, nil];
   id lastSequence = [Sequence: spawner, spawner, spawner, spawner, nil];
   
   [self runAction:lastSequence];

   So it's not alot shorter, but it's prettier and more organized.

   I still think you should use the Shaky3D function, 0.8 has it - not sure about 0.7.

   Posted 2 years ago #
6. 

   alex
   Member

   @natanavra

   Fixed a few typos and got it to work. Its awesome and self-estem is intact. Small steps :-)

   @PatrickC

   Couldn't get it to work but maybe needs some tweaking??? Will try that later.

   Thanks a lot.
   -alex

   Posted 2 years ago #
7. 

   patrickC
   Member

   Ah don't bother with my solution, natanavra's one is the same concept but better implemented.

   Posted 2 years ago #

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