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Chipmunk Physics • View topic - SimpleObjectiveChipmunk Example with UIImageView

SimpleObjectiveChipmunk Example with UIImageView

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SimpleObjectiveChipmunk Example with UIImageView

Postby affect » Wed Aug 25, 2010 3:44 am

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Re: SimpleObjectiveChipmunk Example with UIImageView

Postby Paul10 » Wed Aug 25, 2010 8:19 am

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Re: SimpleObjectiveChipmunk Example with UIImageView

Postby slembcke » Wed Aug 25, 2010 8:52 am

I think that you should be able to just use [touch locationInView:[self view]] without having to convert it at all. The coordinate system used is simply the local coordinates of the parent view.
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Re: SimpleObjectiveChipmunk Example with UIImageView

Postby Paul10 » Wed Aug 25, 2010 9:00 am

Is that an advantage of using the objective-c chipmunk....no need to convert coordinates?
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Re: SimpleObjectiveChipmunk Example with UIImageView

Postby slembcke » Wed Aug 25, 2010 10:40 am

No, Chipmunk doesn't assume any sort of coordinate system. In this case the view's coordinates are the Chipmunk coordinates. OpenGL lets you set up your coordinate system however you want, which is why you must convert the coordinates.
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Re: SimpleObjectiveChipmunk Example with UIImageView

Postby affect » Wed Aug 25, 2010 11:24 am

@slembcke
"[touch locationInView:[self view]]" does not work with UIButton but "almost" with UIImageView.

@Paul10
Your solution works for the UIButton but i have to click on the opposide of the screen. Button is bottom, i have to click on top. I have to move down the mouse and the button goes up Lef/right is ok.

With an UIImageView both solutions work, but the screen seems to be 50 pixel to the right and to the bottom.
Here are the Screenshots:
1. UIButton lower left corner
2. UIImageView lower left corner
3. UIImageview lower right corner


thank you for your help!
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Re: SimpleObjectiveChipmunk Example with UIImageView

Postby Paul10 » Wed Aug 25, 2010 8:52 pm

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Re: SimpleObjectiveChipmunk Example with UIImageView

Postby slembcke » Wed Aug 25, 2010 9:12 pm

It sounds like you treating your Chipmunk space where the positive y axis is up. I consider this "normal" as I find it easier to reason with. Cocoa views treat the positive y axis as going down the screen.

If you simply create your world assuming that the positive y axis is down, then your coordinates match up with Cocoa's.
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Re: SimpleObjectiveChipmunk Example with UIImageView

Postby affect » Thu Aug 26, 2010 2:36 am

Solution found.

1.
UIButton has its center at (0,0), UIImageView at (width/2, height/2). Setting the center of image view to (0,0) show this view correctly at screen like the button.

2.
"[touch locationInView:[self view]]" with button does not work because UIButton do not respond to touches events in ViewController.

Solution:
Using UIImageView with center (0, 0) and using "cpVect point = [touch locationInView:[self view]]" does work as expected on iPhone and iPad.


@Paul10
I dont use OpenGL/cocos2d too, no need to use "480-...".

Thanks.
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