Chipmunk physics accessing shapes in multiple methods issue

Nibbie

Posts: 1
Joined: 2010.03

Post: #1

Mar 24, 2010 — 11:53 AM

Hello all,

I'm brand new to iphone development and I (Probably stupidly) decided to jump in at the deep end.

I have what is probably a very simple issue to fix, but with my general newbieness its giving me on hell of a headache.

Basically I have a simple physics based game running where you're trying to make all the balls fall off the screen by removing the blocks in the way.

My issue is I can't for the life of me get the blocks to remove properly from anything other than the method I've declared the shapes (And bodies) in, if I try to do so it gives me 'ballBody' and 'ballShape' undeclared errors.

So effectively I have the game kicking off, when I hit the start button it calls a method that declares and programatically builds the sprites, then assigns the chipmunk physics shapes and interaction bodies onto it. :

Code:

- (void)setupChipmunk {

    //start Chipmunk

    cpInitChipmunk();

    //Create a space object

    space = cpSpaceNew();

 // Create our ball's body with 100 mass

 // and infinite moment

    //                              mass    moment

    cpBody *ballBody = cpBodyNew(100.0, INFINITY);

 // Set the initial Position

                //Width, Height

    ballBody->p = cpv(60, 250);

 // Add the body to the space

    cpSpaceAddBody(space, ballBody);

    //Create our shape associated with the ball's body

    cpShape *ballShape = cpCircleShapeNew(ballBody, 20.0, cpvzero);

    ballShape->e = 1.0; //Elasticty

    ballShape->u = 0.8; // Friction

    ballShape->data = ball; //Associate without ball's UIImageView

//    cpShape *ballShape = cpCircleShapeNew(ballBody, 20.0, cpvzero);

    // Add the shape to out space

    cpSpaceAddShape(space, ballShape);

}

For the sake of it I've only taken the 'ballShape' code which is the one I'm trying to delete when touched currently.

Then within the touchesBegan method I have : -

Code:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

UITouch *touch = [[event allTouches] anyObject];

    if(ball.center.y > self.view.bounds.size.height) {

        if(ball.center.y > self.view.bounds.size.height + 10) {             

            score_int = score_int + 1;

            score.text = [NSString stringWithFormat:@"%d",score_int];     

            cpSpaceRemoveBody(space, ballBody);

            cpSpaceRemoveShape(space, ballShape);

            [ball removeFromSuperview];    

        }

}

Which currently fires off 'ballBody' and 'ballShape' undeclared errors.

These two lines of code are what I need to disable the body & shape (And so turn off the representation of the sprite I'm using.

Code:

cpSpaceRemoveBody(space, ballBody);

cpSpaceRemoveShape(space, ballShape);

I'm guessing its going to be a simple call in the header of the method to access the instance variables, but I can't work out what it is

Any help would be much appreciated, really ripping my hair out with this one.

Thanks in advance

JinnoRb

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