Question

我希望我的SKNode像下面的图像一样旋转：）

相反，它围绕屏幕的左下角旋转！ Click Here To View Video of what is happening that I do not want

如何在一个位置旋转counterClockWise或Clockwise，如上图所示？

提前感谢能够帮助我的人。不确定我是否需要更改锚点或什么......谢谢

以下是我在swift中的代码。

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate {


var top = SKSpriteNode()
var bottom = SKSpriteNode()
var line = SKSpriteNode()
var RightSide = SKSpriteNode()
var LeftSide = SKSpriteNode()
var pointBar = SKSpriteNode()
var Second_point_Bar_For_First_Hoop = SKSpriteNode()

override func didMove(to view: SKView) {

    physicsWorld.contactDelegate = self

    createHoop()

}

func createHoop() {

    top = SKSpriteNode(imageNamed: "top")
    top.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2 + 15)
    top.size = CGSize(width: 100, height: 60)
    top.zPosition = 0

    bottom = SKSpriteNode(imageNamed: "bottom")
    bottom.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2 - 45)
    bottom.size = CGSize(width: 100, height: 60)
    bottom.zPosition = 2

    LeftSide = SKSpriteNode()
    LeftSide.position = CGPoint(x: bottom.position.x - 40, y: bottom.position.y)
    LeftSide.size = CGSize(width: 10, height: 10)
    LeftSide.zPosition = 0
    LeftSide.color = UIColor.blue

    RightSide = SKSpriteNode()
    RightSide.position = CGPoint(x: bottom.position.x + 40, y: bottom.position.y)
    RightSide.size = CGSize(width: 5, height: 10)
    RightSide.zPosition = 0
    RightSide.color = UIColor.blue

    pointBar = SKSpriteNode()
    pointBar.position = CGPoint(x: bottom.position.x, y: bottom.position.y + 10)
    pointBar.size = CGSize(width: 90, height: 2)
    pointBar.zPosition = 100
    pointBar.color = UIColor.green
    pointBar.zPosition = 100

    Second_point_Bar_For_First_Hoop = SKSpriteNode()
    Second_point_Bar_For_First_Hoop.position = CGPoint(x: top.position.x, y: top.position.y - 10)
    Second_point_Bar_For_First_Hoop.size = CGSize(width: 90, height: 2)
    Second_point_Bar_For_First_Hoop.zPosition = 100
    Second_point_Bar_For_First_Hoop.color = UIColor.green
    Second_point_Bar_For_First_Hoop.zPosition = 100

    let hoopPair = SKNode()

    hoopPair.addChild(top)
    hoopPair.addChild(pointBar)
    hoopPair.addChild(Second_point_Bar_For_First_Hoop)
    hoopPair.addChild(bottom)
    hoopPair.addChild(LeftSide)
    hoopPair.addChild(RightSide)

    let rotate = SKAction.rotate(byAngle: 1, duration: 5)
    let repeatRotation = SKAction.repeatForever(rotate)

    hoopPair.run(repeatRotation)

    self.addChild(hoopPair)
}

override func update(_ currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */



}
}

Answer 1

精灵的锚点是什么？精灵围绕其锚点旋转，你的似乎设置为（0,0），即左下角。如果是这样，请尝试将其更改为（0.5,0.5）

Answer 2

默认情况下，SKNode锚点始终为0.5,0.5。这意味着您需要处理这些位置，以便一切都离开节点的中心。

现在一切都是相对的，所以你的顶部和底部都是相对于你的环节点。

然后你需要移动hoopnode位置，使它在你想要的位置。

以下是执行此操作的代码：
（注意我拿出所有不必要的代码让你的图像在中心旋转）
（另一个节点：如果size不起作用，请使用frame.size）

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate {


var top = SKSpriteNode() var bottom = SKSpriteNode() var line = SKSpriteNode() var RightSide = SKSpriteNode() var LeftSide = SKSpriteNode() var pointBar = SKSpriteNode() var Second_point_Bar_For_First_Hoop = SKSpriteNode()

override func didMove(to view: SKView) {

    physicsWorld.contactDelegate = self

    createHoop()

}

func createHoop() {

    top = SKSpriteNode(imageNamed: "top")
    top.size = CGSize(width: 100, height: 60)
    top.position = CGPoint(x: 0, y: top.size.height/2)
    top.zPosition = 0

    bottom = SKSpriteNode(imageNamed: "bottom")
    bottom.size = CGSize(width: 100, height: 60)
    bottom.position = CGPoint(x: 0, y: -bottom.size.height/2)
    bottom.zPosition = 2


    let hoopPair = SKNode()

    hoopPair.addChild(top)
    hoopPair.addChild(bottom)

    let rotate = SKAction.rotate(byAngle: 1, duration: 5)
    let repeatRotation = SKAction.repeatForever(rotate)


    hoopPair.position = CGPoint(x:self.size.width/2,self.size.height/2)
    hoopPair.run(repeatRotation)

    self.addChild(hoopPair) }

override func update(_ currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */



} }

如何在swift中旋转SKNode

2 个答案: