I want to retrieve the iPhone's accelerometer values and print them into a label.
Any help is appreciated.
Put this in viewDidLoad method of your ViewController which is UIAccelerometerDelegate:
UIAccelerometer *accelerometer = [UIAccelerometer sharedAccelerometer];
accelerometer.updateInterval = 1.0f/60.0f;
accelerometer.delegate = self;
Then add this method:
-(void)accelerometer:(UIAccelerometer *)acelerometer didAccelerate:(UIAcceleration*)acceleration
{
// here you can use acceleration.x, acceleration.y, acceleration.z
}
Related
i have his code for making movemnt of the object through horizontal postion.
#define kAccelerationSpeed 10
#define kAccelerometerFrequency 200
-(void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
CGPoint pt = thePlayer.position ;
CGFloat accel = acceleration.x * kAccelerationSpeed;
pt = [[CCDirector sharedDirector] convertToGL:pt];
pt = ccp (pt.x+accel>0 , yLocationOfPlayer+accel<768 );
}
in init statment
-(id) init
{
// always call "super" init
// Apple recommends to re-assign "self" with the "super" return value
if( (self=[super init])) {
[[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / kAccelerometerFrequency)];
[[UIAccelerometer sharedAccelerometer] setDelegate:self];
}
whats wrong with the above code,it is not working,when i tilt the screen,it is not making any movemnt for the "theplayer" object.please help me to do this.
thanks in advance.
Are you sure your delegates are setup to report accelerometer information? Are you also assigning thePlayer.position in the accelerometer callback? I can't recall why but I do recall trying assignment within the callback and the results were rather stuttered and problematic. The solution for me was to have a variable the accelerometer delegate call will modify and assign the position of thePlayer inside of a tick script based on the variable update in the delegate callback.
you're not assigning the position of the player sprite. Try this:
NSLog(#"position before = %#", [NSValue valueWithCGPoint:thePlayer.position]);
thePlayer.position = ccp (pt.x+accel>0 , yLocationOfPlayer+accel<768 );
NSLog(#"position after = %#", [NSValue valueWithCGPoint:thePlayer.position]);
The logging will help you to determine if 1) the delegate method is getting fired and 2) the positions are as you are expecting.
am developing one application using UIAccelerometer , and i retrived the x,y, z values .
i need to mive one object (consider UIImageView) using these values.
here is my code
UIAccelerometer *accel = [UIAccelerometer sharedAccelerometer];
accel.delegate = self;
accel.updateInterval = 1.0f/60.0f;
- (void)accelerometer:(UIAccelerometer *)acel didAccelerate:(UIAcceleration *)aceler
{
NSLog(#"%f %f %f",aceler.x,aceler.y,aceler.z);
//i think here i can give the position of objects, tried object.frame.size.x=accelr.x; but which is not assignable :(
}
what i can do for moving the object according to the accelarometer value, somethin like spirit level?
and any idea how to turn the accelerometer data into degrees?
I want to add a start button which will start the accelerometer, how can I set an IBAction to do that, in my code I use:
-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
x.text = [NSString stringWithFormat:#"X is: %f", acceleration.x];
y.text = [NSString stringWithFormat:#"Y is: %f", acceleration.y];
z.text = [NSString stringWithFormat:#"Z is: %f", acceleration.z];
NSLog (#"Y = #%f", y.text);
}
-(IBAction)startPedometerPressed {
[startButton accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration];
}
This returns an error because of the undeclared identifier 'accelerometer'.
I'm sure there is something wrong in how I call the method but not sure what is it!
you have to write your accelerometer initialization code in the IBAction function. remove it from ViewDidLoad. now accelerometer works after the button pressed.
-(IBAction)startPedometerPressed
{
[[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / kAccelerometerFrequency)];
[[UIAccelerometer sharedAccelerometer] setDelegate:self];
}
Hope this helps.
I'm trying to make a simple app utilizing gyroscope, where a character moves according to the rotation of the iPad 1.
My code is not working, so I tested to see the values of raw,pitch,yaw,
and they actually stay as zero however I move the device.
I'm sure iPad 1 supports CMMotionManager, so I'm not sure what's causing it...
My code is as follows
- (id) init{
if((self=[super init])){
self.isTouchEnabled = YES;
winSize = [[CCDirector sharedDirector] winSize];
[self createRabbitSprite];
self.motionManager = [[CMMotionManager alloc] init];
motionManager.deviceMotionUpdateInterval = 1.0/60.0;
if(motionManager.isDeviceMotionAvailable){
[motionManager startDeviceMotionUpdates];
}
[self scheduleUpdate];
//[self registerWithTouchDispatcher];
}
return self;
}
-(void)update:(ccTime)delta{
CMDeviceMotion *currentDeviceMotion = motionManager.deviceMotion;
CMAttitude *currentAttitude = currentDeviceMotion.attitude;
if(referenceFrame){
[currentAttitude multiplyByInverseOfAttitude:referenceFrame];
}
float roll = currentAttitude.roll;
float pitch = currentAttitude.pitch;
float yaw = currentAttitude.yaw;
NSLog(#"%.2f and %.2f and %.2f",roll,pitch,yaw);
rabbit.rotation = CC_RADIANS_TO_DEGREES(yaw);
}
Please help me out..
and thanx in advance.
(edit)
Apparently, motionManager.isDeviceMotionAvailable is returning FALSE...
which must mean that iPad 1 doesn't support CoreMotion???
Could it be something with the setting?
The iPad First generation does support CMMotionManager (as it has an accelerometer), but won't return any gyroscopic data - it doesn't have a gyroscope! You'll need to check the gyroAvailable property of a CMMotionManager instance.
I have an object that i intalize it's propertis with call to an init function, it works fine,
when i tried to add another object and intalize it the first object didn't get the properites, how do i initalize it to more then one object with diffrent or the same properties?
- (void)viewDidLoad {
pic1 = [[peopleAccel alloc] init];
}
Class peopleAccel:
- (id) init
{
self = [super init];
if (self != nil) {
position = CGPointMake(100.0, 100.0);
velocity = CGPointMake(4.0, 4.0);
radius = 40.0;
bounce = -0.1f;
gravity = 0.5f;
dragging = NO;
[[UIAccelerometer sharedAccelerometer] setDelegate:self];
acceleratedGravity = CGPointMake(0.0, gravity);
}
return self;
}
I see a problem with setting the delegate of sharedAccelerometer. Only one object can be a delegate of another object at a time. So you should create only one peopleAccel object.
EDIT:
If you need to send accelerometer events to more than one object, you can create a specific delegate object in charge of receiving accelerometer events and broadcasting them to your several peopleAccel objects via notifications. See this question for some hints: NSNotificationCenter vs delegation?
Create a proxy so multiple objects can receive accelerometer events.
Whether you should do this or use NSNotificationCenter is debatable and there are two camps, but personally I would use this approach. NSNotificationCenter has to check string names to recognise event type; this kind of approach could be ever so slightly faster especially with a bit more optimisation. A bit more typing but I would say also easier for someone else to follow.
Something like this...
/* PLUMBING */
/* in headers */
#protocol MyAccelSubDelegate
-(void)accelerometer:(UIAccelerometer*)accelerometer
didAccelerate:(UIAcceleration*)acceleration;
#end
#interface MyAccelSubDelegateProxy : NSObject <UIAccelerometerDelegate> {
NSMutableArray subDelegates;
}
-(id)init;
-dealloc;
-(void)addSubDelegate:(id<MyAccelSubDelegate>)subDelegate;
-(void)removeSubDelegate:(id<MyAccelSubDelegate>)subDelegate;
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:
(UIAcceleration *)acceleration;
#end
/* in .m file */
#implementation MyAccelSubDelegateProxy
-(id)init { self = [super init];
if (self!=nil) subDelegates = [[NSMutableArray alloc] init]; return self; }
-dealloc { [subDelegates release]; }
-(void)addSubDelegate:(id<MyAccelSubDelegate>)subDelegate {
[subDelegates insertObject:subDelegate atIndex:subDelegates.count]; }
-(void)removeSubDelegate:(id<MyAccelSubDelegate>)subDelegate {
for (int c=0; c < subDelegates.count; c++) {
id<MyAccelSubDelegate> item = [subDelegates objectAtIndex:c];
if (item==subDelegate) { [subDelegates removeObjectAtIndex:c];
c--; continue; }
}
}
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:
(UIAcceleration *)acceleration {
for (int c=0; c < subDelegates.count; c++)
[((id<MyAccelSubDelegate>)[subDelegates objectAtIndex:c])
accelerometer:accelerometer didAccelerate:acceleration];
}
#end
/* SOMEWHERE IN MAIN APPLICATION FLOW STARTUP */
accelProxy = [[MyAccelSubDelegateProxy alloc] init];
[UIAccelerometer sharedAcclerometer].delegate = accelProxy;
[UIAccelerometer sharedAcclerometer].updateInterval = 0.100; // for example
/* TO ADD A SUBDELEGATE */
[accelProxy addSubDelegate:obj];
/* TO REMOVE A SUBDELEGATE */
[accelProxy removeSubDelegate:obj];
/* SOMEWHERE IN MAIN APPLICATION SHUTDOWN */
[UIAccelerometer sharedAcclerometer].delegate = nil;
[accelProxy release];