Moving an Object With a Single Touch

[wilky94]

I am currently making an image dodging game and when you click anywhere on the screen the movable image goes to there does anyone know how I can stop this from happening.

[harrytheshark]

It might help if you post your image moving code.

[wilky94]

Originally Posted by harrytheshark

It might help if you post your image moving code.

My code:

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	
	
	UITouch *touch = [[event allTouches] anyObject];
	CGPoint location = [touch locationInView:touch.view];
	one.center = location;

[self Collision];

}

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
	[self touchesBegan:touches withEvent:event];

	
	
}

[harrytheshark]

Right, well you've programmed it to do so.

one.center = location;

That's telling "one" to go to where the screen was tapped.

[wilky94]

Originally Posted by harrytheshark

Right, well you've programmed it to do so.

one.center = location;

That's telling "one" to go to where the screen was tapped.

should I just delete that code?

[harrytheshark]

Deleting the code will mean "one" doesn't move at all. If that's what you want, then yes, delete that bit of code.

[wilky94]

Originally Posted by harrytheshark

Deleting the code will mean "one" doesn't move at all. If that's what you want, then yes, delete that bit of code.

I need one to move when the user drags it but not is a random part of the screen is clicked

[harrytheshark]

I'd put the code in touchesMoved, but check if the touch is on "one" before moving it.

[wilky94]

Originally Posted by harrytheshark

I'd put the code in touchesMoved, but check if the touch is on "one" before moving it.

thank you for all your help it worked.

[wilky94]

it works but when I click somewhere and drag the image moves to there do you know what I can do?

[harrytheshark]

Like I said in my last post, check that the touch is on the object before moving it.

[wilky94]

Originally Posted by harrytheshark

Like I said in my last post, check that the touch is on the object before moving it.

what do you mean by the touch is on the object.

[harrytheshark]

Has the person got their finger on the object?

Check the coordinates of the touch, then compare them with the object.

[wilky94]

Originally Posted by harrytheshark

Has the person got their finger on the object?

Check the coordinates of the touch, then compare them with the object.

where can I check the coordinates could you post some code?

[harrytheshark]

Check the coordinates in the touchesMoved event.

//Taken from what you posted
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];

"location" has the coordinates of the touch, and if you're unsure of how to get the coordinates for "one", the documentation should have everything you need.

[wilky94]

Originally Posted by harrytheshark

Check the coordinates in the touchesMoved event.

//Taken from what you posted
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];

"location" has the coordinates of the touch, and if you're unsure of how to get the coordinates for "one", the documentation should have everything you need.

do I put that code in the TouchesMoved section and what do I do with the code in the TouchesBegan?

[harrytheshark]

I would put it in the touchesMoved function. From the looks of it, you don't need anything in touchesBegan.

[wilky94]

Originally Posted by harrytheshark

I would put it in the touchesMoved function. From the looks of it, you don't need anything in touchesBegan.

I now have this code but it still happens

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

	
	[self Collision];
	

}

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
	
	
	UITouch *touch = [[event allTouches] anyObject];
	CGPoint location = [touch locationInView:touch.view];
	one.center = location;
	
	
	
	
	
}

[harrytheshark]

That's because you're not checking to see if the touch is on the object.

[wilky94]

Originally Posted by harrytheshark

That's because you're not checking to see if the touch is on the object.

how can I check this, what should I search for in the documentation sorry I am very new to iPhone development.

[harrytheshark]

Well, look up CGPoint, to see how you can get x values and y values for the touch. Then look up whatever your object is to see how you can get x values and y values for that.

Then use some simple if statements to compare them.

[wilky94]

Originally Posted by harrytheshark

Well, look up CGPoint, to see how you can get x values and y values for the touch. Then look up whatever your object is to see how you can get x values and y values for that.

Then use some simple if statements to compare them.

	image.center = CGPointMake(image.center.x+pos.x, image.center.y+pos.y);
	if (image.center.x > 295 || image.center.x < 25)
		pos.x = -pos.x;
	if (image.center.y > 375 || image.center.y < 30)
		pos.y = -pos.y;

is this what you mean.

[harrytheshark]

What are "pos" and "nana"?

[wilky94]

Originally Posted by harrytheshark

What are "pos" and "nana"?

the image is the images i have moving around and the pos is the CGPoint for them

[harrytheshark]

So you still need to compare where the touch is.