I want to get direction of the device motion by using accelerometer. I tried method suggested here as below :-
- (void)accelerometer:(UIAccelerometer *)acel didAccelerate:(UIAcceleration *)aceler {
if (fabsf(aceler.x) > 1.5)
{
shake = YES;
NSTimeInterval myInterval = .75;
[NSTimer scheduledTimerWithTimeInterval:myInterval target:self selector:#selector(endShake) userInfo:nil repeats:NO];
return;
}
if(shake)
{
totalG += aceler.x;
}
}
- (void) endShake {
shake = NO;
int direction;
if (totalG isLessThan 0) direction = 1;
if(totalG isGreaterThan 0) direction = -1;
[self changePageByShake:direction];
totalG = 0;
}
But it's not giving accurate results. Is there any standard way to get the direction of the device ?
Note :- This is different from orientation of the device.
Related
I am having a problem with my coding on Xcode. I am making an app in which a target appears, then you have to tap it, but the time allowed between each tap shortens gradually.
MY PROBLEM: whenever I try and make a UILabel update after a tap, the target goes back to it's original position on my view controller. I have all relevant code here:
-(IBAction)startButtonPressed:(id)sender {
startButton.hidden = YES;
Text.hidden = YES;
targX = arc4random() %769;
targY = arc4random() % 925;
Target.center = CGPointMake(targX, targY);
Target.hidden = NO;
}
-(IBAction)targetTapped:(id)sender {
[Time invalidate];
targX = arc4random() %769;
targY = arc4random() % 925;
[self scoreAdd:(id)sender];
Target.center = CGPointMake(targX, targY);
timeMax = 5 - (Score * 0.05);
if (Score >= 90) {
timeMax = 0.5;
}
Time = [NSTimer scheduledTimerWithTimeInterval:timeMax target:self selector:#selector(Lose:) userInfo:nil repeats:NO];
}
-(void)Lose:(id)sender {
Target.hidden = YES;
Text.hidden = NO;
}
-(void)scoreAdd:(id)sender{
Score = Score + 1;
scoreLabel.text = [NSString stringWithFormat:#"Score: %li", Score];
}
print
targX = arc4random() %769;
targY = arc4random() % 925;
in both methods , check whether you are getting proper points. And check generated points lies with in device screen.
Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 8 years ago.
Improve this question
I have just started developing a game, new to Objective-c. Basically at the moment you can move the spaceship around and the spaceship fires continually and there are asteroids coming from the top of screen. But my app freezes after a minute every time why is this?
CODE
#import "AppDelegate.h"
#pragma mark - HelloWorldLayer
// HelloWorldLayer implementation
#implementation HelloWorldLayer
// Helper class method that creates a Scene with the HelloWorldLayer as the only child.
+(CCScene *) scene
{
// 'scene' is an autorelease object.
CCScene *scene = [CCScene node];
// 'layer' is an autorelease object.
HelloWorldLayer *layer = [HelloWorldLayer node];
// add layer as a child to scene
[scene addChild: layer];
// return the scene
return scene;
}
// on "init" you need to initialize your instance
-(id) init
{
if( (self=[super init]) ) {
self.isTouchEnabled = YES;
moveLeft = NO;
moveRight = NO;
speed = 3;
fireSpeed = 8;
fireArray = [[NSMutableArray alloc] init];
CGSize winSize = [[CCDirector sharedDirector] winSize];
CCSprite *bg = [[CCSprite alloc] initWithFile:#"space_bg.jpg"];
[bg setPosition:ccp(160, 240)];
CGSize imageSize = bg.contentSize;
bg.scaleX = winSize.width / imageSize.width;
bg.scaleY = winSize.height / imageSize.height;
bg.position = ccp(winSize.width/2, winSize.height/2);
[self addChild:bg];
ship = [[CCSprite alloc] initWithFile:#"ship.png"];
[ship setPosition:ccp(100, 100)];
[self addChild:ship];
[self schedule:#selector(fireLoop:)];
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1
target:self
selector:#selector(fireCreate)
userInfo:nil
repeats:YES];
int t = arc4random() % 5;
timer3 = [NSTimer scheduledTimerWithTimeInterval:t
target:self
selector:#selector(asteroidTimer)
userInfo:nil
repeats:YES];
}
return self;
}
NSTimer *timer3;
NSTimer *timer2;
NSTimer *tmpTimer;
-(void)asteroidTimer {
int t = arc4random() % 10;
timer2 = [NSTimer scheduledTimerWithTimeInterval:0
target:self
selector:#selector(asteroidCreate)
userInfo:nil
repeats:YES];
}
-(void)asteroidCreate {
[timer2 invalidate];
[tmpTimer invalidate];
CGSize winSize = [[CCDirector sharedDirector] winSize];
[[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:#"asteroids.plist"];
CCSpriteBatchNode *spriteSheet = [CCSpriteBatchNode batchNodeWithFile:#"asteroids.png"];
NSMutableArray *asteroidAnimFrames = [NSMutableArray array];
for(int i=1; i <= 8; i++) {
[asteroidAnimFrames addObject:[[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName:[NSString stringWithFormat:#"asteroid%d.png", i]]];
}
CCAnimation *moveAsteroidAnim = [CCAnimation animationWithFrames:asteroidAnimFrames delay:0.1f];
CCSprite *asteroid = [CCSprite spriteWithSpriteFrameName:#"asteroid1.png"];
int x = arc4random() % 320;
int y = arc4random() % 480;
asteroid.position = ccp(x, 480);
CCAction *asteroidAction = [CCRepeatForever actionWithAction:[CCAnimate actionWithAnimation:moveAsteroidAnim restoreOriginalFrame:NO]];
int q = arc4random() % 320;
int r = arc4random() % 10;
CCAction *moveAction = [CCMoveTo actionWithDuration:r position:ccp(q, -50)];
[asteroid runAction:moveAction];
[asteroid runAction:asteroidAction];
[spriteSheet addChild:asteroid];
[self addChild:spriteSheet];
int t = arc4random() % 10;
tmpTimer = [NSTimer scheduledTimerWithTimeInterval:t
target:self
selector:#selector(asteroidTimer)
userInfo:nil
repeats:YES];
}
-(void)fireLoop:(ccTime)fl {
if(fireArray.count > 0) {
for(int i = 0; i < fireArray.count; i++){
CCSprite *tmpFire = [fireArray objectAtIndex:i];
if(tmpFire.position.y < 500){
[tmpFire setPosition:ccp([tmpFire position].x, [tmpFire position].y + fireSpeed)];
}else{
[fireArray removeObjectAtIndex:i];
}
}
} else
{
}
}
-(void)fireCreate {
int shootPositionX = [ship position].x;
int shootPositionY = ([ship position].y) + 35;
CCSprite *fire;
fire = [[CCSprite alloc] initWithFile:#"fire.png"];
[fire setPosition:ccp(shootPositionX, shootPositionY)];
[fireArray addObject:fire];
[self addChild:fire];
[fire release];
}
-(void)gameLoop:(ccTime)dt {
int shipPositionX = 41/2;
if([ship position].x > shipPositionX){
[ship setPosition:ccp([ship position].x - speed, [ship position].y)];
}
}
-(void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
for(UITouch *t in touches){
CGPoint point = [self convertTouchToNodeSpace:t];
//if(point.x <= 160){
// moveRight = NO;
// moveLeft = YES;
//}else{
// moveRight =YES;
// moveLeft = NO;
//}
if(allowedToMove)
[ship setPosition:ccp(point.x, point.y + 76)];
}
}
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
for(UITouch *t in touches){
CGPoint point = [self convertTouchToNodeSpace:t];
int shipX = [ship position].x;
int shipY = [ship position].y;
if (CGRectContainsPoint(CGRectMake (shipX - 20.5, shipY - 96, 50, 50), point))
{
allowedToMove = true;
}
}
}
-(void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
for(UITouch *t in touches){
CGPoint point = [self convertTouchToNodeSpace:t];
pointXLeft = point.x;
pointYLeft = point.y;
allowedToMove = false;
}
}
// on "dealloc" you need to release all your retained objects
- (void) dealloc
{
// in case you have something to dealloc, do it in this method
// in this particular example nothing needs to be released.
// cocos2d will automatically release all the children (Label)
// don't forget to call "super dealloc"
[super dealloc];
}
In general track down what seems to be causing it. What does the debugger say? Did you stop the execution or set a breakpoint somewhere that might be problematic? What about exception breakpoints? If those don't work take out your timers and see if you have any change. What about your fire methods?
Also your use of timers look weird and should be the first area you look. Side note, for the asteroids why are you not running the two actions you want to run on the new asteroid using CCSpawn?
In addition are you ever removing projectiles that you shoot from the screen or the asteroids that are no longer needed? If not you should.
But to answer your question the problem looks most likely a timer issue. Your use of timers are wrong. You have timer-3 call asteroid timer, which in turns creates timer-2 that calls asteroid create, which in turns invalidates timer-2 (that had an interval of 0 which makes it look a little unnecessary) and also creates a tmp-timer that calls asteroid create. Timer 3 is left to continuously do what it wants, which is all the steps above, at every x number of seconds. Even though tmp-timer seems to be trying to spawn more asteroid creations and take over the process, instead that looks both incorrect and odd. And you are doing this with a few global timers that can, seemingly have a valid timer but is overridden by a new allocation, just to be invalidated by another method randomly soon after even though what it was trying to invalidate technically was leaked and no longer has a pointer to it, thus invalidating the wrong instance to the wrong timer. Keep in mind your tmp-timer and timer-3 has random intervals. If tmp-timer has an interval of 3 seconds and timer-3 has a 9 second interval at some point something looks like it is bound to go wrong. It is hard to say by glancing at it just how, but it looks inevitable.
Or at least I think that is what is happening. Again the code makes very weird and potentially error prone use of timers.
Also timer-1 is going to keep creating sprites unchecked without those sprites ever going away. Something to think about for sure.
Edit (Solution):
If I understand what you are trying to do you want to create timers every variable amount of seconds that, at the end, creates a new asteroid. There are two things that stand out with this. You want something to call the creation of an asteroid, and something else to do the actual create:
- (void)countDownToCreateNextAsteroid
{
int minTime = 1;
int maxTime = 10;
int randomTime = (arc4random() % (maxTime - minTime)) + minTime;
id countdownDelay = [CCDelayTime actionWithDuration:randomTime];
id creationMethod = [CCCallFunc actionWithTarget:self selector:#selector(createAsteroid)];
id countdownToCreateSeq = [CCSequence actions:countdownDelay, creationMethod, nil];
[self stopAllActions];
[self runAction:countdownToCreateSeq];
}
- (void)createAsteroid
{
CGPoint someStartPosition = ccp(1024.0f, 512.0f);
CCSprite* asteroid = [CCSprite spriteWithFile:#"someImage.png"];
asteroid.position = someStartPosition;
// asterdoid dot yada yada = ....
[self addChild:asteroid];
float someDuration = 10.0f;
CGPoint someOffscreenPos = ccp(-1024.0f, 512.0f);
// Move off screen, then remove yourself...
id asteroidMove = [CCMoveTo actionWithDuration:someDuration
position:someOffscreenPos];
id asteroidRemove = [CCCallBlock actionWithBlock:^
{
[asteroid removeFromParentAndCleanup:YES];
}];
id asteroidSeq = [CCSequence actions:asteroidMove, asteroidRemove, nil];
[asteroid runAction:asteroidSeq];
[self countDownToCreateNextAsteroid];
}
Therefore in your onEnter you could have something to kick it all off and that's it:
- (void)onEnter
{
[super onEnter];
// yada yada
[self countDownToCreateNextAsteroid];
}
And the rest would take care of itself. This assumes this quick and simple approach is all you were after. The count down method sets up the count down, calls a method to create an asteroid at the end of that time, then exits. After the asteroid is created a new call to the count down method is invoked, which will setup another asteroid to be created at another random time. This is one quick and simple way to do what it looks you are were actually trying to accomplish with all those timers.
I've tried several method but I cannot find a working method to replace my
[[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / kAccelerometerFrequency)];
[[UIAccelerometer sharedAccelerometer] setDelegate:self];
most recently i've tried to replace that with
motionManager = [[CMMotionManager alloc] init];
motionManager.accelerometerUpdateInterval = (1.0 / kAccelerometerFrequency);
But it does not seem to work with my void
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
CGPoint pt = theCar.center;
CGFloat accel = acceleration.x * kAccelerationSpeed;
float halfCarWidth = theCar.frame.size.width / 2;
if(pt.x - halfCarWidth + accel > 0 && pt.x + halfCarWidth + accel < 320) {
pt.x += accel;
}
[theCar setCenter:pt];
}
So what do I replace the sharedAccelerometer with since it was depreciated in iOS 5
There is no delegate message with motion manager. Use a timer (NSTimer) and poll the motion manager for its values, at intervals.
self.motman = [CMMotionManager new];
if (!self.motman.accelerometerAvailable) {
// report error or whatever
return;
}
self.motman.accelerometerUpdateInterval = 1.0 / 30.0;
[self.motman startAccelerometerUpdates];
self.timer =
[NSTimer
scheduledTimerWithTimeInterval:self.motman.accelerometerUpdateInterval
target:self selector:#selector(pollAccel:) userInfo:nil repeats:YES];
Now pollAccel: is called repeatedly. Pull out the accelerometer info:
CMAccelerometerData* dat = self.motman.accelerometerData;
CMAcceleration acc = dat.acceleration;
I am trying to make a game movement animation in objective c so that when a button is pressed something will move across the screen while it is pressed. This works fine though the calling of the NSTimer which I am using is irregular and I am getting laggy movements. This is in iOS 6 so I wont use sprite kit as it is not available
Any suggestions on how to make it a regular call or to make it a smooth animation would be much appreciated
Thanks in advance
Here is the code:
-(void) click {
if (!self.animating) {
self.animating = YES;
timer = [NSTimer scheduledTimerWithTimeInterval:0.01
target:self
selector:#selector(move)
userInfo:nil
repeats:YES];
}
}
- (void) cancelClick {
self.animating = NO;
[timer invalidate];
}
-(void) move {
CGPoint origin = self.target.frame.origin;
if ([self.direction isEqual:#"left"]) {
origin.x -= self.magnitude;
} else if ([self.direction isEqual:#"right"]) {
origin.x += _magnitude;
} else if ([self.direction isEqual:#"up"]) {
origin.y -= _magnitude;
} else {
origin.y += _magnitude;
}
[self.target move:0 toPoint:origin animated:YES delay:0 animationOptions:UIViewAnimationOptionCurveLinear];
}
I have 10 fireflies that I make "fly" around the screen using the code below.
The code also serves to keep the fireflies on the screen.
- (void)viewDidLoad
{
[super viewDidLoad];
NSArray *blueArray = [NSArray array];
blueArray = [[NSArray alloc] initWithObjects:
[UIImage imageNamed:#"blue1.png"],
[UIImage imageNamed:#"blue2.png"], nil];
blue.animationImages = blueArray;
blue.animationDuration = 0.20;
blue.animationRepeatCount = -1;
[blue startAnimating];
bluepos =CGPointMake(2.0, 1.5);
}
-(void) someMethod {
endingAnimationTimer = [NSTimer scheduledTimerWithTimeInterval:(0.03) target:self selector:#selector(makeFly) userInfo:nil repeats:YES];
}
-(void) makeFly {
blue.center = CGPointMake(blue.center.x+bluepos.x, blue.center.y+bluepos.y);{
if(blue.center.x > 480 || blue.center.x <0)
bluepos.x = -bluepos.x;
if(blue.center.y > 320 || blue.center.y <0)
bluepos.y = -bluepos.y;
}
}
The "flying" works great except that when the fireflies hit the edge of the screen and reverse direction to keep them on the screen the firefly image itself is still "facing" the othe direction so it looks like they are flying backwards half the time.
I want to set it up so that when the fireflies hit the edge of the screen they reverse direction AND the image itself is reversed.
I tried this:
In .h
#property (nonatomic, assign) BOOL blueIsFacingRight;
In .m
#synthesize blueIsFacingRight;
-(void) makeFly {
blue.center = CGPointMake(blue.center.x+bluepos.x, blue.center.y+bluepos.y); {
if(blue.center.x > 480 ) {
if (blueIsFacingRight == YES) {
blue.transform = CGAffineTransformMakeScale(-1, 1);
blueIsFacingRight = NO;
}
bluepos.x = -bluepos.x;
}
if(blue.center.x <0) {
bluepos.x = -bluepos.x;
if (blueIsFacingRight == NO) {
blue.transform = CGAffineTransformMakeScale(1, 1);
blueIsFacingRight = YES;
}
}
if(blue.center.y > 320 )
bluepos.y = -bluepos.y;
if( blue.center.y <0)
bluepos.y = -bluepos.y;
}
}
I thought this would work but the image does not reverse when it hits the "wall"
Can anyone explain why this does not work and if there is a better why to accomplish the effect im looking for?
You are setting the transform X value to -1 in both cases. When its facing right you should set transform like this CGAffineTransformMakeScale(1, 1);
blue.center = CGPointMake(blue.center.x+bluepos.x, blue.center.y+bluepos.y); {
if(blue.center.x > 480 ) {
if (blueIsFacingRight == YES) {
blue.transform = CGAffineTransformMakeScale(-1, 1);
blueIsFacingRight = NO;
}
bluepos.x = -bluepos.x;
}
if(blue.center.x <0) {
bluepos.x = -bluepos.x;
if (blueIsFacingRight == NO) {
blue.transform = CGAffineTransformMakeScale(1, 1);
blueIsFacingRight = YES;
}
}
**blue.transform =CGAffineTransformIdentity;**
THe above was in my makeFly method with a bunch of other stuff above where I was reversing the image so I was undoing the change the very next time the method was called ( 0.03 later)
Man I feel stupid