Question

我试图将玩家旋转到触摸状态。使用触摸移动功能，我将位置设置为变量。然后我调用一个函数。它工作但角度是关闭的。位置是全局变量，玩家是我要转的精灵。它关闭了大约15度。

   func rotatePlayer(){

     let angle = atan2(location!.y - player!.position.y , location!.x - player!.position.x)
    player?.zRotation = angle
}

Answer 1

根据SpriteKit Best Practices doc

使用符合SpriteKit坐标和旋转约定的游戏逻辑和艺术资产。这意味着将艺术品定位在右侧。如果您将图稿定向到其他方向，则需要在艺术品使用的约定和SpriteKit使用的约定之间转换角度。

由于默认宇宙飞船向上指向（当zRotation为0时），你需要将角度偏移90度（pi / 2弧度），以便当zRotation为零时船舶朝向右侧：

player?.zRotation = angle - CGFloat(M_PI_2)

或者，您可以将太空船旋转到右侧。要旋转图像，请单击Assets.xcassets，然后单击Spaceship。右键单击Spaceship图像，然后选择“在外部编辑器中打开”菜单项。这将在预览应用程序中打开图像。在预览中，选择工具＆gt;向右旋转并退出预览。通过旋转图稿，您的代码可以在不做任何更改的情况下工作。

Answer 2

尝试这样的事情

//set sprite to image



Person = SKSpriteNode(imageNamed: "Person")




    //set size
    Person.size = CGSize(width: 40, height: 7)



    //set position
    Person.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2 + 120)





    //rotate node 3.14 / 2 = to 90 degree angle
    Person.zRotation = 3.14 / 2



    Person.zPosition = 2.0

Answer 3

使用方向约束将对象旋转到触摸位置：

// Create two global Sprite properties:

var heroSprite = SKSpriteNode(imageNamed:"Spaceship")
var invisibleControllerSprite = SKSpriteNode()

override func didMoveToView(view: SKView) {         

   // Create the hero sprite and place it in the middle of the screen
   heroSprite.xScale = 0.15
   heroSprite.yScale = 0.15
   heroSprite.position = CGPointMake(self.frame.width/2, self.frame.height/2)
   self.addChild(heroSprite)

   // Define invisible sprite for rotating and steering behavior without trigonometry
   invisibleControllerSprite.size = CGSizeMake(0, 0)
   self.addChild(invisibleControllerSprite)

   // Define a constraint for the orientation behavior
   let rangeForOrientation = SKRange(constantValue: CGFloat(M_2_PI*7))

   heroSprite.constraints = [SKConstraint.orientToNode(invisibleControllerSprite, offset: rangeForOrientation)]

}

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    /* Called when a touch begins */        
    for touch: AnyObject in touches {

        // Determine the new position for the invisible sprite:
        // The calculation is needed to ensure the positions of both sprites 
        // are nearly the same, but different. Otherwise the hero sprite rotates
        // back to it's original orientation after reaching the location of 
        // the invisible sprite
        var xOffset:CGFloat = 1.0
        var yOffset:CGFloat = 1.0
        var location = touch.locationInNode(self)
        if location.x>heroSprite.position.x {
            xOffset = -1.0
        }
        if location.y>heroSprite.position.y {
            yOffset = -1.0
        }

        // Create an action to move the invisibleControllerSprite. 
        // This will cause automatic orientation changes for the hero sprite
        let actionMoveInvisibleNode = SKAction.moveTo(CGPointMake(location.x - xOffset, location.y - yOffset), duration: 0.2)
        invisibleControllerSprite.runAction(actionMoveInvisibleNode)

        // Optional: Create an action to move the hero sprite to the touch location
        let actionMove = SKAction.moveTo(location, duration: 1)
        heroSprite.runAction(actionMove)

    }

}

教程：http://stefansdevplayground.blogspot.de/2014/11/how-to-implement-space-shooter-with.html

视频：https://youtu.be/8d8MH_gXt84

使用Swift将精灵旋转到精灵位置不精确的SpriteKit中

3 个答案: