cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   pfg2009
   Member

   I've just updated to the latest greatest Cocos2D and, wow, things have changed! So now I'm hunting through my code trying to figure out which of my own hacks are no longer needed because they are now officially supported by the framework. Woohoo! A quick question about autorotation to which I can't seem to find an answer:

   Say my app wants to support Portrait and PortraitUpsideDown. And say that I'm relying on accelerometer to tell me which way is DOWN. I'm using the UIView autorotate code in Cocos2D. How can I tell if the UIView was rotated so that I can reverse my accelerometer vector?

   Posted 1 year ago #
2. 

   pfg2009
   Member

   I just found this code. Is this the preferred way to deal with this or is there a magic CCDirector flag I can just check?

   - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
   
   	UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
   	ccDeviceOrientation cor = (ccDeviceOrientation)orientation;
   
   	if( cor == UIDeviceOrientationLandscapeLeft)
   	{
   		// Landscape left code
   	}
   	else if ( cor == UIDeviceOrientationLandscapeRight )
   	{
   		// Landscape right code
   	}
   }

   Posted 1 year ago #
3. 

   pfg2009
   Member

   Also, I'm noticing some strange behavior. I have autorotation set to use UIView. I'm working on the iPad and I'm only supporting landscape orientation. When I start the app in LandscapeLeft, everything works as expected. When I start the app in LandscapeRight, the app opens in LandscapeLeft (ie. upside-down from what I would expect) and immediately proceeds to turn into LandscapeRight. In other words, I experience a completely unnecessary rotation because the UI initially opens upside down. That doesn't seem like the correct behavior. Am I missing something?

   Posted 1 year ago #
4. 

   wasabibit
   Member

   Hi pfg2009,
   I use RootViewController(singleton in my game) and make reference to interfaceOrientation of it from anywhere in my game.

   Posted 1 year ago #
5. 

   pfg2009
   Member

   Thanks for that tip!

   Posted 1 year ago #
6. 

   TBBle
   Moderator

   Keep in mind that UI LandscapeLeft is StatusBar LandscapeRight... I believe there's a bug open in the cocos2d bug tracker which has these reversed, as well.

   Also, check your Info.plist for supported UI orientations. It'll only open in one of those, and if you're then querying the accelerometer directly to reorient your display (which I heartily disrecommend, as someone who frequently locks rotation on his iPod and sometimes plays games lying on his back in bed) you'll be getting a orientation that the app startup sequence was not allowed to use, hence the immediate rotation.

   If you're on a iPod/iPhone, remember that all apps launch only in Portrait or PortraitUpsideDown and then rotate, while iPad can launch in any allowed orientation.

   I don't know the circumstances of your game, but in general I recommend using UIView rotation and simply letting the normal UIKit rotation notifications and handlers rotate your views (i.e. the code in the 0.99.5 template's AppDelegate and RootViewController) then things like screen rotation lock are taken care of for you.

   Posted 1 year ago #

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