From 08cb72a92328cb0f38947fe5e8c5f23bab8cd0cc Mon Sep 17 00:00:00 2001
From: Starla Insigna <starla4444@gmail.com>
Date: Mon, 17 Oct 2011 20:57:46 -0400
Subject: Added support for gyroscope-based movement

Closes #230
---
 Classes/GameMode.m | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 59 insertions(+), 4 deletions(-)

(limited to 'Classes/GameMode.m')

diff --git a/Classes/GameMode.m b/Classes/GameMode.m
index 1e80237..e45ddfe 100644
--- a/Classes/GameMode.m
+++ b/Classes/GameMode.m
@@ -33,8 +33,6 @@
     
     if (nil != self)
     {
-        isAccelerometerEnabled_ = YES;
-        
         objects = [[NSMutableSet alloc] init];
         
         cart = [[Cart alloc] initWithSprite:[CCSprite spriteWithFile:@"cart.png"]];
@@ -64,6 +62,26 @@
         }
         
         isPaused = NO;
+
+        Class cmClass = (NSClassFromString(@"CMMotionManager"));
+        if (cmClass)
+        {
+            motionManager = [[CMMotionManager alloc] init];
+            
+            if (motionManager.gyroAvailable)
+            {
+                [motionManager setDeviceMotionUpdateInterval:1.0f/60.0f];
+                isAccelerometerEnabled_ = NO;
+                hasGyroscope = YES;
+            } else {
+                isAccelerometerEnabled_ = YES;
+                motionManager = nil;
+                hasGyroscope = NO;
+            }
+        } else {
+            isAccelerometerEnabled_ = YES;
+            hasGyroscope = NO;
+        }
     }
     
     return self;
@@ -71,19 +89,39 @@
 
 - (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration
 {	
-	[cart accelerometer:accelerometer didAccelerate:acceleration];
+    self.pitch = acceleration.y;
 }
 
 - (void)onEnterTransitionDidFinish
 {
     [super onEnterTransitionDidFinish];
     
-    [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / 60)];
+    if (hasGyroscope)
+    {
+        [motionManager startDeviceMotionUpdates];
+    } else {
+        [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / 60)];
+    }
+    
     [self schedule:@selector(tick:) interval:1.0f/60.0f];
 }
 
+- (void)onExit
+{
+    if (hasGyroscope)
+    {
+        [motionManager stopDeviceMotionUpdates];
+    }
+}
+
 - (void)tick:(ccTime)dt
 {
+    if (hasGyroscope)
+    {
+        CMDeviceMotion* motion = [motionManager deviceMotion];
+        self.pitch = -motion.attitude.pitch;
+    }
+    
     [cart tick];
     
     NSMutableSet* discardedObjects = [NSMutableSet set];
@@ -111,6 +149,11 @@
         
         [self pauseSchedulerAndActions];
         
+        if (hasGyroscope)
+        {
+            [motionManager stopDeviceMotionUpdates];
+        }
+        
         shadedLayer = [CCLayerColor layerWithColor:ccc4(0, 0, 0, 127)];
         [[[CCDirector sharedDirector] runningScene] addChild:shadedLayer];
         
@@ -143,6 +186,11 @@
         shadedLayer = nil;
         pauseLayer = nil;
         
+        if (hasGyroscope)
+        {
+            [motionManager startDeviceMotionUpdates];
+        }
+        
         [self resumeSchedulerAndActions];
         
         isPaused = NO;
@@ -211,6 +259,13 @@
     }
 }
 
+- (void)setPitch:(double)m_pitch
+{
+    pitch = m_pitch;
+    
+    [cart deviceDidRotate:pitch];
+}
+
 - (void)dealloc
 {
     [objects release];
-- 
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