Swift 3：沿操纵杆的一致玩家移动 ||精灵包

Question

我的问题是如何将我的精灵与操纵杆一起进行连续运动？我希望玩家一直以一定的速度移动，然后每当用户将操纵杆移动一定角度时，玩家就会跟随它。

ex：Sprite 自动移动一定的速度，例如； speed = CGFloat(100)，然后它将继续以这个速度，通过速度精灵会自动向一个方向移动，我不知道如何实现它，以便我的玩家以恒定的速度移动，以及如何改变方向是用操纵杆移动。

目前使用我的代码我可以旋转精灵。

感谢你们提供的所有帮助，在此先感谢您。

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {


    for touch in touches {
        touchLocation = touch.location(in: self)

        if (ball.frame.contains(touchLocation)) {

            stickActive = true

        } else {
            stickActive = false
        }
    }



}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in touches {
        touchLocation = touch.location(in: self)

        if isAlive == true{ 
            joyStickMoved()

        }
        if isAlive == false{
            player.position.x = -300
        }

    }
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        if (stickActive == true) {
            let move: SKAction = SKAction.move(to: base.position, duration: 0.2)
            move.timingMode = .easeOut
            ball.run(move)
    }
}

func joyStickMoved() {

    if (stickActive == true) {



        let v = CGVector(dx: touchLocation.x - base.position.x, dy: touchLocation.y - base.position.y)
        let angle = atan2(v.dy, v.dx)

        // let degree = angle * CGFloat( 180 / Double.pi)

        let length: CGFloat = base.frame.size.height / 2

        let xDist: CGFloat = sin(angle - 1.57079633) * length
        let yDist: CGFloat = cos(angle - 1.57079633) * length
        //   TODO   // xJoystick = touchLocation.x - base.position.x
        // yJoystick = touchLocation.y - base.position.y

        if (base.frame.contains(touchLocation)) {
            ball.position = touchLocation

        } else {
            ball.position = CGPoint(x: base.position.x - xDist, y: base.position.y + yDist)

        }

        player.zRotation = angle - 1.57079633

    }


}

override func update(_ currentTime: TimeInterval) {



    if isAlive == false && stickActive == false {
        lblMain.text = "Game Over"
        player.position.x = -300
        waitThenResetTheGame()
    }

    if stickActive == true {
        moveNodeToLocation()
    }
}

func spawnPlayer(){
    player = SKSpriteNode(color: offWhiteColor, size: playerSize)
    player.position = CGPoint(x: self.frame.midX, y: 130)

    player.physicsBody = SKPhysicsBody(rectangleOf: (player.size))
    player.physicsBody?.affectedByGravity = false
    player.physicsBody?.categoryBitMask = physicsCategory.player
    player.physicsBody?.contactTestBitMask = physicsCategory.fallingBlock
    player.physicsBody?.isDynamic = false
    player.physicsBody?.allowsRotation = false
    player.physicsBody?.angularVelocity = 5
    player.physicsBody?.angularDamping = 0

    player.name = "player"


    self.addChild(player)
    setupFollower()
}

Answer 1

好吧，如果你使用物理，那么你不想做的一件事就是不断地施加脉冲，你想直接设置你的人移动的速度。

因为我现在在打电话，所以我要写伪代码：

基本上你想做这样的事情：

velocity =(0,0)

On update

    dir = GetDirection()
    switch(dir)
    Case up:  velocity = (0,200/150) // because 1 newton = 150points. Physics uses newtons
    Case down: velocity = (0,-200/150)
    Case left: velocity = (-200/150,0)
    Case right: velocity = (200/150,0)
    end switch

Sprite.physicsbody.velocity= velocity


End update

仅触摸屏控制：

velocity =(0,0)

On touch

    dir = GetDirection()
    switch(dir)
    Case up:  velocity = (0,200/150) // because 1 newton = 150points. Physics uses newtons
    Case down: velocity = (0,-200/150)
    Case left: velocity = (-200/150,0)
    Case right: velocity = (200/150,0)
    end switch
End touch

On update

Sprite.physicsbody.velocity= velocity


End update

Answer 2

为了实现连续移动，您需要跟踪您的玩家正在触摸操纵杆的哪个部分；要么使用操纵杆位置的不同部分，要么只使用节点来跟踪触摸。然后在更新功能中使用力移动您的节点。所以想法是，当您触摸时，您将一些相应的 BOOL 设置为 true，更新会根据它们移动节点，然后在触摸结束时，BOOL 会返回 false，因此您停止移动。

我已经半 sudo 编码了这个，但这应该让你知道你需要做什么：

//in your player class 
func walk(force: CGFloat) {
  self.physicsbody.applyForce(CGVector(dx: force, dy: 0.0))
}

//in your gamescene touchesBegan
if joystickRight.contains(touchlocation) {
  //declare all these BOOL's at the top of your gameScene class
        isTouching = true
        movingRight = true
        xVelocity = 200
}

//in your gamescene touchesEnded
  isTouching = false
  movingRight = false

//in your gamescene update
if isTouching && movingRight {
        thePlayer.walk(force: xVelocity)
}