Box2Dで作ったオブジェクトをiOSの加速度に対応させるの巻！

```obj-c
#import <box2d ox2d.h="">
#import <quartzcore uartzcore.h="">

@interface HomeViewController (){
    b2World *world;
    NSTimer *timer;
}
@end

@implementation ViewController

- (void)loadView
{
    [super loadView];

acc = [UIAccelerometer sharedAccelerometer];
    acc.updateInterval = 1.0f / 10.0f;
    acc.delegate = self;  // 通知を開始させたい時に実行する
}

- (void)createPhysicsWorld
{
    CGSize screenSize = self.view.bounds.size;
    
    b2Vec2 gravity;
    gravity.Set(0.0f, -9.81f);
    
    world = new b2World(gravity);
    world->SetContinuousPhysics(true);
    
    b2BodyDef groundBodyDef;
    groundBodyDef.position.Set(0, 0);
    b2Body* groundBody = world->CreateBody(&groundBodyDef);
    
    b2EdgeShape groundBox;
    groundBox.Set(b2Vec2(0, 0), b2Vec2(screenSize.width/PTMRatio, 0));
    groundBody->CreateFixture(&groundBox, 0);
    
    groundBox.Set(b2Vec2(0,screenSize.height/PTMRatio), b2Vec2(0,0));
    groundBody->CreateFixture(&groundBox, 0);
    
    groundBox.Set(b2Vec2(screenSize.width/PTMRatio, screenSize.height/PTMRatio), b2Vec2(screenSize.width/PTMRatio, 0));
    groundBody->CreateFixture(&groundBox, 0);
}

- (void)start
{
    timer = [NSTimer scheduledTimerWithTimeInterval:1.0/60.0 target:self selector:@selector(tick:) userInfo:nil repeats:YES];
}

- (void)tick:(NSTimer*)sender
{
    int32 velocityIteration = 8;
    int32 positionIteration = 1;
    
    world->Step(1.0f/60.0f, velocityIteration, positionIteration);
    for (b2Body* b = world->GetBodyList(); b; b = b->GetNext()) {
        if (b->GetUserData() != NULL) {
            UIView *v = (UIView *)b->GetUserData();
            CGPoint newCenter = CGPointMake(b->GetPosition().x * PTMRatio, self.view.bounds.size.height - b->GetPosition().y * PTMRatio);
            v.center = newCenter;
        }
    }
}

- (void)addSoftCircles
{
    b2Body** parts = (b2Body**)b2Alloc(sizeof(b2Body*) * 12);
    for (int i=0; i<12 data-blogger-escaped--="" data-blogger-escaped-0.1="" data-blogger-escaped-0="" data-blogger-escaped-160="" data-blogger-escaped-2.0="" data-blogger-escaped-20="" data-blogger-escaped-addsubview:ball="" data-blogger-escaped-alloc="" data-blogger-escaped-atio="" data-blogger-escaped-b2bodydef="" data-blogger-escaped-ball.alpha="0.2;" data-blogger-escaped-ball.backgroundcolor="[UIColor" data-blogger-escaped-ball.center="CGPointMake(x,y);" data-blogger-escaped-ball.layer.borderwidth="2.0;" data-blogger-escaped-ball.layer.cornerradius="ball.bounds.size.width" data-blogger-escaped-ball="" data-blogger-escaped-ballbodydef.position.set="" data-blogger-escaped-ballbodydef.type="b2_dynamicBody;" data-blogger-escaped-ballbodydef.userdata="(void" data-blogger-escaped-ballbodydef="" data-blogger-escaped-bluecolor="" data-blogger-escaped-body="" data-blogger-escaped-cgpoint="" data-blogger-escaped-cos="" data-blogger-escaped-create="" data-blogger-escaped-float="" data-blogger-escaped-i="" data-blogger-escaped-initwithframe:cgrectmake="" data-blogger-escaped-m_pi="" data-blogger-escaped-p.x="" data-blogger-escaped-p.y="" data-blogger-escaped-p="ball.center;" data-blogger-escaped-parts="" data-blogger-escaped-self.view="" data-blogger-escaped-sin="" data-blogger-escaped-th="" data-blogger-escaped-uiview="" data-blogger-escaped-world-="" data-blogger-escaped-x="50" data-blogger-escaped-y="50">CreateBody(&ballBodyDef);
        
        // Create circle shape
        b2CircleShape circle;
        circle.m_radius = ball.bounds.size.width/2.0/PTMRatio;
        
        // Create shape definition and add to body
        b2FixtureDef ballShapeDef;
        ballShapeDef.shape = &circle;
        ballShapeDef.density = 1.0f;
        ballShapeDef.friction = 0.0f;
        ballShapeDef.restitution = 0.5f;
        
        parts[i]->CreateFixture(&ballShapeDef);
    }
    
    UIView *hub = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
    hub.center = CGPointMake(160, 160);
    hub.layer.cornerRadius = hub.bounds.size.width / 2.0;
    hub.backgroundColor = [UIColor blueColor];
    hub.alpha = 0.2;
    hub.layer.borderWidth = 2.0;
    [self.view addSubview:hub];
    
    // Create ball body
    b2BodyDef hubBodyDef;
    hubBodyDef.type = b2_dynamicBody;
    CGPoint p = hub.center;
    hubBodyDef.position.Set(p.x/PTMRatio, (460.0 - p.y)/PTMRatio);
    hubBodyDef.userData = (void *)hub;
    b2Body* hubBody = world->CreateBody(&hubBodyDef);
    
    // Create circle shape
    b2CircleShape circle;
    circle.m_radius = hub.bounds.size.width/2.0/PTMRatio;
    
    // Create shape definition and add to body
    b2FixtureDef hubShapeDef;
    hubShapeDef.shape = &circle;
    hubShapeDef.density = 1.0f;
    hubShapeDef.friction = 0.0f;
    hubShapeDef.restitution = 0.5f;
    hubBody->CreateFixture(&hubShapeDef);
    
    for (int i=0; i<12 data-blogger-escaped-6="" data-blogger-escaped-b2distancejointdef="" data-blogger-escaped-i="" data-blogger-escaped-jointdef.initialize="" data-blogger-escaped-jointdef="" data-blogger-escaped-parts="">GetPosition(), parts[(i+1)%6]->GetPosition());
        jointDef.collideConnected = true;
        jointDef.frequencyHz = 40.0f;
        jointDef.dampingRatio = 0.5;
        world->CreateJoint(&jointDef);
        
        // 中央と繋ぐ
        jointDef.Initialize(parts[i], hubBody, parts[i]->GetPosition(), hubBody->GetPosition());
        jointDef.collideConnected = true;
        jointDef.frequencyHz = 10.0f;
        jointDef.dampingRatio = 0.5;
        world->CreateJoint(&jointDef);
    }
    
}

-(void)createCoffeeImage{
    
    _LevelImageArray = [NSArray arrayWithObjects:
                       [UIImage imageNamed:@"homeBtn.png"],
                       [UIImage imageNamed:@"homeBrn_press.png"],
                       nil];
    
    _coffeeLevelView = [[UIImageView alloc] initWithImage:[_LevelImageArray objectAtIndex:1]];
    _coffeeLevelView.frame = CGRectMake(0, 0, 80, 80);
    _coffeeLevelView.userInteractionEnabled = NO;
    [self.view addSubview:_coffeeLevelView];
}

-(void)createMainCharaIV{
    _mainChara = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bokeee.png"]];
    _mainChara.tag = 100;
    _mainChara.userInteractionEnabled = YES;
    _mainChara.frame = CGRectMake(0, 0, 175, 175);
    _mainChara.center = CGPointMake(self.view.frame.size.width/2, self.view.frame.size.height/2);
    _charaImages = [NSArray arrayWithObjects:
                   [UIImage imageNamed:@"bokeee.png"],
                   [UIImage imageNamed:@"hukuramu.png"],
                   [UIImage imageNamed:@"ochikomu.png"],
                   [UIImage imageNamed:@"odoroki.png"],
                   [UIImage imageNamed:@"sozai1.png"],
                   [UIImage imageNamed:@"yureru.png"],
                   nil];
    _mainChara.animationImages = _charaImages;
    _mainChara.animationDuration = 30;
    _mainChara.animationRepeatCount = 0;
    [_mainChara startAnimating];
    [self.view addSubview:_mainChara];
    
}

//デリゲート
- (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration
{
    static float prevX=0, prevY=0;
    
    //#define kFilterFactor 0.05f
#define kFilterFactor 1.0f  // don't use filter.
    // the code is here just as an example
    
    float accelX = (float) acceleration.x * kFilterFactor + (1- kFilterFactor)*prevX;
    float accelY = (float) acceleration.y * kFilterFactor + (1- kFilterFactor)*prevY;
    
    prevX = accelX;
    prevY = accelY;
    
    // accelerometer values are in "Portrait" mode. Change them to Landscape left
    // multiply the gravity by 10
    b2Vec2 gravity( accelX * 25, accelY * 25);
    
    world->SetGravity( gravity );
}

@end
```

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Box2Dで作ったオブジェクトをiOSの加速度に対応させるの巻！

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