New Developer - Simple Game Help

[Danny159]

Hey All,

I am new to iOS development I am a PHP developer.

I have started a really simple game... get the ball from the start point to the hole...

All working fine so far the ball rolls round the screen, doesn't go off the screen and when you get it in the hole an alert comes up and you can restart....

Anyway now I have that working I have decided to be more adventurous and add obstacles (UIImageViews) walls...

However I am really stuck... I have been stuck on this for weeks and google doesn't seem to help =(

The ball is rolling around the screen using the accelerometer... I added the wall into the .xib file and assigned the *wall I defined in the .h file...

But I can for the life of me stop the ball from rolling though the wall... I can detect a collision using this code:

if(CGRectIntersectsRect(ball.frame, wall1.frame)){
        NSLog(@"Wall was hit");
}

Can anyone please help me in stopping the call from going through the wall, the users has to navigate round the wall.

Dan

[SundialSoft]

Originally Posted by Danny159

Hey All,

I am new to iOS development I am a PHP developer.

I have started a really simple game... get the ball from the start point to the hole...

All working fine so far the ball rolls round the screen, doesn't go off the screen and when you get it in the hole an alert comes up and you can restart....

Anyway now I have that working I have decided to be more adventurous and add obstacles (UIImageViews) walls...

However I am really stuck... I have been stuck on this for weeks and google doesn't seem to help =(

The ball is rolling around the screen using the accelerometer... I added the wall into the .xib file and assigned the *wall I defined in the .h file...

But I can for the life of me stop the ball from rolling though the wall... I can detect a collision using this code:

if(CGRectIntersectsRect(ball.frame, wall1.frame)){
        NSLog(@"Wall was hit");
}

Can anyone please help me in stopping the call from going through the wall, the users has to navigate round the wall.

Dan

Hi Danny, your approach is fine for very simple stuff but won't lead to a real app. I suggest you start by looking at these tutorials:- How To Make A Simple iPhone Game with Cocos2D Tutorial | Ray Wenderlich

To make a decent 2D or 3D game you need to get away from using the high level objects like uiimageviews etc which are made for apps not games. Ray uses cocos2d in his tutorials. Cocos2d also has a 3d extension in beta (cocos3d).

You can get your current code to work. You don't say how the ball is moving. Is it a uiimage being moved by coordinate changes coming from accelerometer data? You need to stop the movement when there is a collision and deal with restarting when the direction changes.

[Danny159]

Originally Posted by SundialSoft

Hi Danny, your approach is fine for very simple stuff but won't lead to a real app. I suggest you start by looking at these tutorials:- How To Make A Simple iPhone Game with Cocos2D Tutorial | Ray Wenderlich

To make a decent 2D or 3D game you need to get away from using the high level objects like uiimageviews etc which are made for apps not games. Ray uses cocos2d in his tutorials. Cocos2d also has a 3d extension in beta (cocos3d).

You can get your current code to work. You don't say how the ball is moving. Is it a uiimage being moved by coordinate changes coming from accelerometer data? You need to stop the movement when there is a collision and deal with restarting when the direction changes.

Hi Thanks for your post back.
I will have a look at that website.

Getting this to work would be good just go I can see how the code would work.

Yes that is correct... I have detected the ball hitting the wall but im not sure on how to deal with it now... here is some of my code:

// Start Exceloromiter
    CGRect frame = [ball frame];
    frame.origin.x = 145.0f; // was 146.0f
    frame.origin.y = 343.0; // was 372.0
    [ball setFrame:frame];
    
    [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1/60.0)];
    [[UIAccelerometer sharedAccelerometer] setDelegate:self];

-(void)moveBoxWithX:(float)xAmount andY:(float)yAmount {
    CGPoint boxCenter = ball.center;
    
    [self CheckForObstruction];
    [self DetectHoleHit];
    
    boxCenter.x += xAmount;
    boxCenter.y += yAmount;
    
    NSString *deviceType = [[UIDevice currentDevice] model];
    
    if([deviceType isEqualToString:@"iPhone"]){
        if(boxCenter.x < 36.0)
            boxCenter.x = 36.0;
        if(boxCenter.x > 283.0)
            boxCenter.x = 283.0;
        
        if(boxCenter.y < 36.0)
            boxCenter.y = 36.0;
        if(boxCenter.y > 423.0)
            boxCenter.y = 423.0;
    }
    
    else if([deviceType isEqualToString:@"iPod touch"]){
        if(boxCenter.x < 19.0)
            boxCenter.x = 19.0;
        if(boxCenter.x > 299.0)
            boxCenter.x = 299.0;
        
        if(boxCenter.y < 19.0)
            boxCenter.y = 19.0;
        if(boxCenter.y > 439.0)
            boxCenter.y = 439.0;
    }
    
    ball.center = boxCenter;
    
}

-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
	float sensitivity = 25.0f;
	float xDistance = acceleration.x *sensitivity;
	float yDistance = acceleration.y *-sensitivity;
	
	[self moveBoxWithX:xDistance andY:yDistance];
	
}

[Danny159]

Hey Again guys...

I have got this far...

if(CGRectIntersectsRect(ball.frame, wall1.frame)){
        NSLog(@"Hit A Wall");
        [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1/0.0)];
        [[UIAccelerometer sharedAccelerometer] setDelegate:self];
}

So when my ball rolls into the wall it stops the ball from rolling but I'm stuck... HELP PLEASEEE!!

[Danny159]

Still need help with this!
Dan

[XcodeMagic]

Originally Posted by Danny159

Still need help with this!
Dan

You have a very simple problem.. I can point you to a great tutorial that will teach you about a ball intersecting a pad and the ball does not move through the pad like this : Making a simple iPhone game, part 1 - YouTube

Its a 10 part tutorial and it tought me how to code. trust me I would pay 300$ just to watch this if I was to forget everything about coding to learn again. its that good.

But I can also give you a simple code that you will probably want more than just a tutorial.. So here it is: Check your inbox.

[Naughty_Ottsel]

Originally Posted by Danny159

Hey Again guys...

I have got this far...

if(CGRectIntersectsRect(ball.frame, wall1.frame)){
        NSLog(@"Hit A Wall");
        [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1/0.0)];
        [[UIAccelerometer sharedAccelerometer] setDelegate:self];
}

So when my ball rolls into the wall it stops the ball from rolling but I'm stuck... HELP PLEASEEE!!

if(CGRectIntersectsRect(ball.frame, wall1.frame)){
        NSLog(@"Hit A Wall");
//check where the ball is hitting
if((wall1.center.x - ball.frame.origin.x) <= (wall1.frame.size.width /2))
{
  //If it was the x axis
   [UIView animateWithDuration:1.0 animations:^(void)animations
 {
   ball.frame.origin.x = ball.frame.origin.x + 5;
 }];

}

else if ((wall1.center.y - ball.frame.origin.y) <= (wall1.frame.size.height /2))
{
  //Otherwise if it is the y axis
  [UIView animatieWithDuration:1.0 animations:^(void)animations
 {
  ball.frame.origin.y = ball.frame.origin.y + 5;
 }];

}

}

Not sure if that will run properly, but hopefully a nudge in the right direction

[Danny159]

Originally Posted by Naughty_Ottsel

if(CGRectIntersectsRect(ball.frame, wall1.frame)){
        NSLog(@"Hit A Wall");
//check where the ball is hitting
if((wall1.center.x - ball.frame.origin.x) <= (wall1.frame.size.width /2))
{
  //If it was the x axis
   [UIView animateWithDuration:1.0 animations:^(void)animations
 {
   ball.frame.origin.x = ball.frame.origin.x + 5;
 }];

}

else if ((wall1.center.y - ball.frame.origin.y) <= (wall1.frame.size.height /2))
{
  //Otherwise if it is the y axis
  [UIView animatieWithDuration:1.0 animations:^(void)animations
 {
  ball.frame.origin.y = ball.frame.origin.y + 5;
 }];

}

}

Not sure if that will run properly, but hopefully a nudge in the right direction

Thanks for your reply!!
Sorry its so late...

I added your code but it say there is something wrong with this time... on both of the functions

[UIView animatieWithDuration:1.0 animations:^(void)animations
             {
                 ball.frame.origin.y = ball.frame.origin.y + 5;
             }];

But im not sure quite what?
Anyone have any ideas?

Dan