圍繞不是.anchorPoint的內部點旋轉SkSpriteNode

因此，我使用此代碼順時針或逆時針旋轉對象。圍繞不是.anchorPoint的內部點旋轉SkSpriteNode

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") 
}

我的問題是，這會產生繞SKSpriteNode的定位點順時針或逆時針旋轉。

但是，我希望對象繞SKSprite內的另一個點旋轉（類似於從Sprite圖像底部開始的4/5）。我想我不能使用通過CGPointMake定義的設置點，因爲我希望精靈在屏幕上獨立移動，這不起作用？

任何建議任何人？

來源

2015-10-16 Daniel Richardson

您是否嘗試將您的精靈的anchorPoint屬性設置爲您想讓精靈旋轉的點？

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

這是您要尋找的？

來源

2015-10-16 17:02:46 RoberRM

不幸的是，這導致我的精靈完全消失？ –

Oups，我有多愚蠢：anchorPoint從0變爲1，因此使用4/5是正確的方式......對不起！（我已經更正了我的答案。） – RoberRM

Aaaaand已經完全運作了，太棒了，非常感謝！ –

圍繞不是.anchorPoint的內部點旋轉SkSpriteNode

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