box2d 오목 본체

Question

볼록한 4 가지 모양으로 작성된 내 iOS 게임의 box2d 본문을 만들고 있습니다. 문제는 init 메소드를 호출 할 때 실패한다는 것입니다.

@implementation Banan 
-(void)createBodyAtLocation:(CGPoint)location 
{ 
    int num; 
    float density = 1.0f; 

    b2BodyDef bodyDef; 
    bodyDef.type = b2_dynamicBody; 
    bodyDef.position = b2Vec2(location.x/PTM_RATIO/RETSIZE, location.y/PTM_RATIO/RETSIZE); 
    body = world->CreateBody(&bodyDef); 
    body -> SetUserData(self); 

    //first shape 
    b2FixtureDef fixtureDef1; 
    b2PolygonShape shape1; 
    num = 4; 
    b2Vec2 verts1[4]; 
     verts1[0].Set(58.9f/PTM_RATIO, 46.3f/PTM_RATIO); 
     verts1[1].Set(63.3f/PTM_RATIO, 41.5f/PTM_RATIO); 
     verts1[2].Set(47.4f/PTM_RATIO, 15.6f/PTM_RATIO); 
     verts1[3].Set(43.6f/PTM_RATIO, 24.3f/PTM_RATIO); 
    shape1.Set(verts1, num); 
    fixtureDef1.shape = &shape1; 
    fixtureDef1.density = density; 


    //second 
    b2FixtureDef fixtureDef2; 
    b2PolygonShape shape2; 
    num = 5; 
    b2Vec2 verts2[5]; 
    verts2[0].Set(42.1f/PTM_RATIO, 21.7f/PTM_RATIO); 
    verts2[1].Set(46.6f/PTM_RATIO, -0.1f/PTM_RATIO); 
    verts2[2].Set(29.1f/PTM_RATIO, -32.2f/PTM_RATIO); 
    verts2[3].Set(2.5f/PTM_RATIO, -45.2f/PTM_RATIO); 
    verts2[4].Set(6.8f/PTM_RATIO, -10.4f/PTM_RATIO); 
    shape2.Set(verts2, num); 
    fixtureDef2.shape = &shape2; 
    fixtureDef2.density = density; 

    //third 
    b2FixtureDef fixtureDef3; 
    b2PolygonShape shape3; 
    num = 4; 
    b2Vec2 verts3[4]; 
    verts3[0].Set(5.6f/PTM_RATIO, -9.7f/PTM_RATIO); 
    verts3[1].Set(-0.3f/PTM_RATIO, -45.7f/PTM_RATIO); 
    verts3[2].Set(-32.7f/PTM_RATIO, -41.2f/PTM_RATIO); 
    verts3[3].Set(-28.2f/PTM_RATIO, -15.7f/PTM_RATIO); 
    shape3.Set(verts3, num); 
    fixtureDef3.shape = &shape3; 
    fixtureDef3.density = density; 

    //fourth 
    b2FixtureDef fixtureDef4; 
    b2PolygonShape shape4; 
    num = 4; 
    b2Vec2 verts4[4]; 
    verts4[0].Set(-28.7f/PTM_RATIO, -14.8f/PTM_RATIO); 
    verts4[1].Set(-40.8f/PTM_RATIO, -36.0f/PTM_RATIO); 
    verts4[2].Set(-60.5f/PTM_RATIO, -2.4f/PTM_RATIO); 
    verts4[3].Set(-58.0f/PTM_RATIO, 2.9f/PTM_RATIO); 
    shape4.Set(verts3, num); 
    fixtureDef4.shape = &shape4; 
    fixtureDef4.density = density; 

    //attach to shape 
    body->CreateFixture(&fixtureDef1); 
    body->CreateFixture(&fixtureDef2); 
    body->CreateFixture(&fixtureDef3); 
    body->CreateFixture(&fixtureDef4); 
} 
- (id)initWithWorld:(b2World *)tworld atLocation:(CGPoint)location { 
    if ((self = [super init])) { 
     world = tworld; 
     [self initWithFile:@"Banana.png"]; 
     [self createBodyAtLocation:location]; 
    } 
    return self; 
} 


-(void)dealloc 
{ 
    [super dealloc]; 
} 
@end 

: 여기 내 코드의 '-initWithWorld : atLocation'방법은 ccTouchBegan 방법에 의해 호출 한 후 내 응용 프로그램을 죽이고있다. 오류는 다음과 같습니다 :

어설 션 실패 : b2Polygon 요구 사항이 시계 반대 방향으로있는 동안 (지역> 1.19209290e-7F), 기능 ComputeCentroid ... 귀하의 경우 정점에

-(void)createBananaAtLocation:(CGPoint)location 
{ 
    Banan *ban = [[[Banan alloc] initWithWorld:world atLocation:location] autorelease];//fails at this line when is invoked 
    [self addChild:ban]; 

} 
-(BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event 
{ 
    CGPoint touchLocation = [touch locationInView:[touch view]]; 
    touchLocation = [[CCDirector sharedDirector] 
        convertToGL:touchLocation]; 
    touchLocation = [self convertToNodeSpace:touchLocation]; 
    b2Vec2 locationWorld = 
    b2Vec2(touchLocation.x/PTM_RATIO, touchLocation.y/PTM_RATIO); 

    [self createBananaAtLocation:touchLocation]; //error at this line 
    return YES; 
} 

Answer 1

는, 시계 방향으로 지향하고 있습니다. 다각형의 음수 영역을 계산합니다. 정점의 순서를 변경해야합니다.