chipmunk body and Cocos2d Sprite Move and scale At same time with Touches

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chipmunk body and Cocos2d Sprite Move and scale At same time with Touches

(8 posts) (6 voices)

Started 2 years ago by sunflower
Latest reply from felipe

Tags:

sunflower
Member

Hi,

I am new bee to the cocos2D and chipmunk both. I am trying to learn both at the same time. I am trying to create simple game for learning purpose. In the game i have one fall falling down from top and at the bottom there is one blower (Air Blower) which keep ball up and we can move blower with the touch. So, if ball and blower is not aligned than ball will fall down to floor and game over.

i have created ball (body and shape) and blower (body and shape) in chipmunk space.
which contains data as sprite of cocos2D.so the questions is,

1. How do i move blower (body and sprite) on touch (only in horizontal direction).
2. Also, i want to show blower (air blowing ) effect. should i use particle of cocos2d or it will be too much performance hit. Also, if ball comes in the way of particles than it gets upward force and go up.

I would really appreciate if you can help me learn cocs2d and chipmunk.

Thanks
sunflower

Posted 2 years ago #
jolkonnaa
Member

Hi,

I am another one to count in in new bees to cocos2d and chipmunk. It would be really helpful if anyone respond to this post.

Posted 2 years ago #
molshree
Member

i also want to add an effect of a fan working in a space setup in chipmunk using cocos2d

Posted 1 year ago #
mobilebros
Moderator

@sunflower - I'll help you a bit on your last request there. I've achieved a similar "blower" effect in chipmunk simply by make the blower some sort of shape (invisible) that has a custom collision callback between it and the ball(s). The callback then returns 0 so chipmunk will think no-collision BUT it applies some sort of impulse to the ball (upwards).

I suppose you could make the blower shape static and move it according to touch, but since it's static you would have to rehash the shape every time you move it.

Posted 1 year ago #
molshree
Member

thanks mobilebros but i am using spacemanager so can you help me in dat?? can you please give some more details as to how you implemented the blower effect.

Posted 1 year ago #
molshree
Member

Posted 1 year ago #

mobilebros
Moderator

@molshree - Sure

1. Create a ball shape (circle) and a blower shape (a rect maybe?) and then give them each a collision_type.

ball->collision_type = 1;
blower->collision_type = 2;

2. Create a collision callback that will report no collision but will apply an impulse to the ball.

- (BOOL) blower2ball:(CollisionMoment)moment arbiter:(cpArbiter*)arb space:(cpSpace*)space
{
	CP_ARBITER_GET_SHAPES(arb,a,b);

	//ball should be shape "a"
	cpBodyApplyImpulse(a->body, cpv(0, 500), cpv(0,0)); //second arg is force upwards

	return NO; //Tell chipmunk no collision
}

3. Tell SpaceManager/chipmunk about the collision callback

[smgr addCollisionCallbackBetweenType:1
                            otherType:2
                               target:self
                             selector:@selector(blower2ball: arbiter: space:)
                              moments:COLLISION_PRESOLVE, nil];

4. Done! I'm pretty sure it's the "presolve" moment you want, and of course you'll have to play around with the force argument in the callback in order to get the desired effect. I'm pretty sure I covered everything, hopefully.

Posted 1 year ago #

slembcke
Administrator

If you are creating shape that you plan to always ignore with a callback, you might as well make it a sensor shape. Otherwise you have to set up some way to prevent other unwanted collisions as well.

Posted 1 year ago #
felipe
Member

////////////////////////////////////////////////////////////////
//Move and scale at the same time.
//Just call the actions at the same time.
////////////////////////////////////////////////////////////////

CCSprite * mySprite = [CCSprite ...];
[mySprite runAction:[CCScaleTo ...]];
[mySprite runAction:[CCMoveTo ...]];

////////////////////////////////////////////////////////////////
// Enable CCTouchDispatcher for touches
//
[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];

// when the user thouch the screen
- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
[self selectSpriteForTouch:touchLocation];
return TRUE;
}

- (void)selectSpriteForTouch:(CGPoint)touchLocation {
//code
}

This is a nice example here

Posted 5 months ago #

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