Chipmunk Physics

Can anyone tell me how to enable touches for my objects.
Here is my code:

- (void)viewDidLoad {
background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Background1.png"]];
background.center = CGPointMake(160,230);
floor = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"floor.png"]];
floor.center = CGPointMake(160, 350);
block = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"2x1.png"]];
block.center = CGPointMake(160, 230);
block2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1x1.png"]];
block2.center = CGPointMake(160, 230);
circle1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1Circle.png"]];
circle1.center = CGPointMake(160, 230);

[self.view addSubview:background];
[self.view addSubview:Done3];
[self.view addSubview:floor];
[self.view addSubview:block];
[self.view addSubview:block2];
[self.view addSubview:circle1];
[self setupChipmuck];
}

-(void)setupChipmuck {
cpInitChipmunk();
space = cpSpaceNew();
space->gravity = cpv(0, -100);
space->elasticIterations = 10;
[NSTimer scheduledTimerWithTimeInterval:1.0f/60.0f target:self selector:@selector(tick:) userInfo:nil repeats:YES];

// Create our ball's body with 100 mass and infinite moment
cpBody *blockBody = cpBodyNew(100.0, INFINITY);
// Set the initial position
blockBody->p = cpv(60, 400);
// Add the body to the space
cpSpaceAddBody(space, blockBody);
// Create our shape associated with the ball's body
cpShape *blockShape = cpCircleShapeNew(blockBody, 38.0, cpvzero);
blockShape->e = 0.5; // Elasticity
blockShape->u = 1.0; // Friction
blockShape->data = block; // Associate with out ball's UIImageView
blockShape->collision_type = 1; // Collisions are grouped by types
// Add the shape to out space
cpSpaceAddShape(space, blockShape);

// Create our ball's body with 100 mass and infinite moment
cpBody *block2Body = cpBodyNew(100.0, INFINITY);
// Set the initial position
block2Body->p = cpv(200, 300);
// Add the body to the space
cpSpaceAddBody(space, block2Body);
cpShape *block2Shape = cpCircleShapeNew(block2Body, 38.0, cpvzero);
block2Shape->e = 1.2;
block2Shape->u = 0.3;
block2Shape->data = block2;
block2Shape->collision_type = 1;
cpSpaceAddShape(space, block2Shape);

//Circle
cpBody *circle1Body = cpBodyNew(100.0, INFINITY);
circle1Body->p = cpv(200, 225);
cpSpaceAddBody(space, circle1Body);
cpShape *circle1Shape = cpCircleShapeNew(circle1Body, 36.0, cpvzero);
circle1Shape->e = 2.0;
circle1Shape->u = 0.3;
circle1Shape->data = circle1;
circle1Shape->collision_type = 1;
cpSpaceAddShape(space, circle1Shape);

//Floor
cpBody *floorBody = cpBodyNew(INFINITY, INFINITY);
floorBody->p = cpv(160, 480-350);

cpVect verts1[] = { cpv(0.0, 0.0), cpv(50.0, 0.0), cpv(45.0, -15.0), cpv(0.0, -15.0) };
cpVect verts2[] = { cpv(50.0, 0.0), cpv(116.0, -66.0), cpv(110.0, -81.0), cpv(45.0, -15.0) };
cpVect verts3[] = { cpv(116.0, -66.0), cpv(204.0, -66.0), cpv(210.0, -81.0), cpv(110.0, -81.0) };
cpVect verts4[] = { cpv(204.0, -66.0), cpv(270.0, 0.0), cpv(275.0, -15.0), cpv(210.0, -81.0) };
cpVect verts5[] = { cpv(270.0, 0.0), cpv(320.0, 0.0), cpv(320.0, -15.0), cpv(275.0, -15.0) };

cpShape *floorShape = cpPolyShapeNew(floorBody, 4, verts1, cpv(-320.0f / 2, 81.0f / 2));
floorShape->e = 0.5; floorShape->u = 0.5; floorShape->collision_type = 0;
floorShape->data = floor;
cpSpaceAddStaticShape(space, floorShape);

floorShape = cpPolyShapeNew(floorBody, 4, verts2, cpv(-320.0f / 2, 81.0f / 2));
floorShape->e = 0.5; floorShape->u = 0.5; floorShape->collision_type = 0;
floorShape->data = floor;
cpSpaceAddStaticShape(space, floorShape);

floorShape = cpPolyShapeNew(floorBody, 4, verts3, cpv(-320.0f / 2, 81.0f / 2));
floorShape->e = 0.5; floorShape->u = 0.5; floorShape->collision_type = 0;
floorShape->data = floor;
cpSpaceAddStaticShape(space, floorShape);

floorShape = cpPolyShapeNew(floorBody, 4, verts4, cpv(-320.0f / 2, 81.0f / 2));
floorShape->e = 0.5; floorShape->u = 0.5; floorShape->collision_type = 0;
floorShape->data = floor;
cpSpaceAddStaticShape(space, floorShape);

floorShape = cpPolyShapeNew(floorBody, 4, verts5, cpv(-320.0f / 2, 81.0f / 2));
floorShape->e = 0.5; floorShape->u = 0.5; floorShape->collision_type = 0;
floorShape->data = floor;
cpSpaceAddStaticShape(space, floorShape);
}

The trunk code has an example of how to implement grabbing onto objects.

slembcke wrote:The trunk code has an example of how to implement grabbing onto objects.

I too am having a problem using touches on the iPhone, and I looked in the google code page, but I found nothing about touches. Care to be a little more specific as to where the example is?

The function "click" is where the magic happens.

1. Call cpSpacePointQueryFirst in order to intercept the object below the current mouse position
2. Attach a pivot joint to the body
3. When the user moves the pointer update joint position and velocity
4. When the user release the button remove the joint

I used my own touch code at first, but then found the cpMouse.c/h files, and have been using it ever since, very easy to use, just add calls to your ccTouchesBegan/Moved/Ended/Cancelled methods. Just search for cpMouse in these forums. Or search for "grabbedtoo" iPhone project, that was an example I looked at to first see how to use cpMouse. There's a slight tweak to using cpMouse in these forums.

-RK