CODEWITHSUNDEEP
iphone
RKBang
RKBang

Reputation: 1

How to create a moving balls application in iPhone

I want to create an application where balls keep moving on iPhone screen and they when they collide they gets a rebounding action. Every minute I want to add 1 balll upto a limit.

Is there any easy way to do it or anyone have done this kind of application.

Upvotes: 0

Views: 283

Answers (4)

RayofHope
RayofHope

Reputation: 1187

Hope this lines of code may helps you.

Declare this in your .h file:

IBOutlet UIImageView *ball;
CGPoint pos;

Now complete hooking for imageview from your xib file to ball(declared in .h file).

Now open your .m file and place this code:

-(void)viewDidLoad
{

        [super viewDidLoad];
        pos = CGPointMake(14.0,7.0);
        [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(onTimer)        userInfo:nil repeats:YES];

}

-(void) onTimer 
{

        ball.center = CGPointMake(ball.center.x+pos.x,ball.center.y+pos.y);

        if(ball.center.x > 320 || ball.center.x < 0)
        pos.x = -pos.x;

        if(ball.center.y > 460 || ball.center.y < 0)
                pos.y = -pos.y;
}

Upvotes: 0

whooops
whooops

Reputation: 935

Split up your app into lots of smaller problems. Start by displaying one square, then make it a sphere, then try displaying many of them, and then adding some movement, and then the physics calculations. There are probably lots of tutorials on each of those smaller steps.

Upvotes: 0

Cruachan
Cruachan

Reputation: 15971

I coded something like this up as an exercise a few months back. I was using around 120 facets on each sphere and very standard completely elastic 'billiard ball' collision physics - implemented directly in OpenGL using Phong shading.

I don't pretend the application was optimised but there wasn't any utter howlers in it, and on a standard iPhone (3G, not the latest 3GS ones) I was able to handle about a dozen balls before the frame-rate slowed to unusable.

Upvotes: 1

ennuikiller
ennuikiller

Reputation: 46965

Kind of an open-ended question but here is a tutorial on creating "pong" which should get you started thinking about the physics behind the motion.

Upvotes: 0

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