物理 body 不符合形状？

Question

出于某种原因，当我在 skshapenode 周围应用物理 body 时，它会将物理 body 放置在实际形状的左侧和下方，即使物理参数 [=14] =] 来自形状。有谁知道为什么？谢谢。

-(SKShapeNode*) createGround1
{
    //create a rectangle
    ground1 = [SKShapeNode shapeNodeWithRect:CGRectMake(0, 0, 300, 19)];
    ground1.position = CGPointMake(800, 500);

    //applies physics to rectangle
    ground1.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize: CGSizeMake(ground1.frame.size.width, ground1.frame.size.height)];
    ground1.physicsBody.allowsRotation = false;
    ground1.physicsBody.dynamic = false;
    ground1.physicsBody.restitution = 0.0;

    return ground1;
}

Answer 1

出现这种情况是因为定位点不同。您需要像这样为您的物理体定义一个中心点：

ground1.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(ground1.frame.size.width, ground1.frame.size.height) center:CGPointMake(150, 9.5)];

物理 body 不符合形状？

physics body not inline with shape?

objective-c

ios

sprite-kit