iphone status orientation

iOS
#1

geetings,

i’m new to openFrameworks, but it seems really easy. i have a little experience with Processing, and decided to start playing around with openFrameworks for the iPhone.
the first day i coded a simple app (a clock… not to complex, but i’m taking baby steps here).
it’s working great, but want it to change when the iphone is sideways or upside down, so that the numbers rotate to become legible. is there any special function to detect this, or do i need to use objective C to detect the change in orientation?
waht i am looking for is a function that would give me a value like left, right, up or down (could also be an angle like 90, -90, 180) so i know wich way to rotate the letters…

any hints?

many thanks,

Bruno

p.s. i really loved the cat pictures in the registration process

#2

i’ve looked around in the files, and found out i can get the orientation using ofxAccelerometer.getOrientation(), but how do i get the x and y values?

ofPoint &getOrientation() {
updateOrientation();
return orientation;
}

it seems it is a ofPoint type value that is returned. i don’t find any references to ofPoint in the API Documentation in the wiki.
i am a bit lost here, and it seems to be quite simple.
i’d really appreciate some tips.

#3

hey, the full comments for that function in ofxAccelerometer.h should be:

  
	// returns current orientation in degrees (x: pitch, y: roll, z: not used)  
	ofPoint &getOrientation() {  
		updateOrientation();  
		return orientation;  
	}

so you can use it by doing (in your testApp.cpp or any other cpp):

  
  
ofPoint orientation = ofxAccelerometer.getOrientation();  
orientation.x is the pitch  
orientation.y is the roll

Note, if you want to use the iphone orientation to orient a 3D object in 3D space you are better off using getMatrix(); This returns a float* which contains the orientation matrix which you can pass directly to opengl using glMultMatrixf

#4

thank you very much for the reply.

i guess it really was simple.

“Note, if you want to use the iphone orientation to orient a 3D object in 3D space you are better off using getMatrix(); This returns a float* which contains the orientation matrix which you can pass directly to opengl using glMultMatrixf” <- this seems way out of my league… i’m just starting with open frameworks.

my purpose is to rotate the elements on-screen like the iphone safari does, if it’s sideways, it rotates the screen elements sideways in order to be more legible. (it’s a series of clocks i’m making, so when sideways or upside down, you can read the numbers / text / drawings to see the time).

once again, thank you for your help.

#5

ah, for that you don’t even need to check the accelerometer and do fancy math to see the device orientation. You can simply (using objective c - rename your .cpp to .mm) check

  
  
[UIDevice currentDevice].orientation

and compare it against these values

  
   UIDeviceOrientationUnknown,  
   UIDeviceOrientationPortrait,  
   UIDeviceOrientationPortraitUpsideDown,  
   UIDeviceOrientationLandscapeLeft,  
   UIDeviceOrientationLandscapeRight,  
   UIDeviceOrientationFaceUp,  
   UIDeviceOrientationFaceDown

You can check the orientation every frame and draw accordingly, but if you want you can also register for the device orientation notification and not check every frame. More info at
http://developer.apple.com/iphone/libra-…-evice.html

(this would all be ObjC unfortunately)

#6

it’s working!

i added the following to void setup(){}

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

and then

[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];}

to void exit()

then i did just as you said and it’s working. now all i got to do is make objects rotate which is quite simple.

thank you very very much. you made my day!