我想通过IOS SpriteKit制作足球
我能够在代码中创建一个球,如下所示。 但是,它根本没有反弹。 为了反弹率,我该怎么做?
(UITouch *touch in touches) {
SKSpriteNode *sprite = [SKSpriteNode spriteNodeWithImageNamed:@"Ball"];
sprite.position = location;
const CGFloat radius = 20.0f;
SKPhysicsBody *pbody = [SKPhysicsBody bodyWithCircleOfRadius:radius];
sprite.physicsBody = pbody;
sprite.size = (CGSize){radius * 2, radius * 2};
sprite.physicsBody.linearDamping=0.12f;
[self addChild:sprite];
}
我已经这样宣布了。
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
self.backgroundColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:(CGRect){CGPointZero, size}];
self.physicsWorld.gravity=CGVectorMake(0, -100);
}
return self;
}
答案 0 :(得分:1)
这看起来像是一个球给我
- (void) soccerBallExample
{
// the world bounds
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:CGRectMake(0, 0, self.size.width, self.size.height)];
// the ball
SKShapeNode *ball;
ball = [[SKShapeNode alloc] init];
CGMutablePathRef myPath = CGPathCreateMutable();
CGPathAddArc(myPath, NULL, 0,0, 30, 0, M_PI*2, YES);
ball.path = myPath;
CGPathRelease(myPath);
ball.fillColor = [SKColor blueColor];
ball.position = CGPointMake(200, 200);
[self addChild:ball];
// set the physics
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:30];
ball.physicsBody.restitution = 0.8;
}
在您的示例中,您使用精灵以便半径使用
// ball.size.width * 0.5;