Question

所以我使用此代码顺时针或逆时针旋转对象。

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {

    let touch = touches.first as UITouch!
    let touchPosition = touch.locationInNode(self)
    let newRotationDirection : rotationDirection = touchPosition.x < CGRectGetMidX(self.frame) ? .clockwise : .counterClockwise

    if currentRotationDirection != newRotationDirection && currentRotationDirection != .none {
        reverseRotation()
        currentRotationDirection = newRotationDirection
    }
    else if (currentRotationDirection == .none) {
        setupRotationWith(direction: newRotationDirection)
        currentRotationDirection = newRotationDirection
    }
}



func reverseRotation(){
    let oldRotateAction = ship.actionForKey("rotate")
    let newRotateAction = SKAction.reversedAction(oldRotateAction!)
    ship.runAction(newRotateAction(), withKey: "rotate")
}



func stopRotation(){
    ship.removeActionForKey("rotate")
}



func setupRotationWith(direction direction: rotationDirection){
    let angle : CGFloat = (direction == .clockwise) ? CGFloat(M_PI) : -CGFloat(M_PI)
    let rotate = SKAction.rotateByAngle(angle, duration: 2)
    let repeatAction = SKAction.repeatActionForever(rotate)
    ship.runAction(repeatAction, withKey: "rotate")
}

我的问题是，这会在SKSpriteNode的锚点周围产生顺时针或逆时针旋转。

但是我希望对象围绕SKSprite内部的另一个点旋转（类似于精灵图像底部的4/5）。我假设我不能使用通过CGPointMake定义的设定点，因为我希望精灵独立地在屏幕上移动，这不起作用？

有人建议吗？

Answer 1

您是否尝试过将精灵的anchorPoint属性设置为您希望精灵旋转的位置？

ship.anchorPoint = CGPoint(x: 0, y: 4/5)

这是你在找什么？

围绕不是.anchorPoint的内部点旋转SkSpriteNode

1 个答案: