斯威夫特：如何在玩家武器上制造子弹？

时间：2022-05-27 23:08:20

I have a class CharacterCreator which makes the player and inside it I have these functions to make the player shoot:

我有一个类CharacterCreator,它使玩家和内部我有这些功能,让玩家拍摄:

func shoot(scene: SKScene) {
    if (playerArmed) {
        let bullet = self.createBullet()
        scene.addChild(bullet)
        bullet.position = playerWeaponBarrel.position
        bullet.physicsBody?.velocity = CGVectorMake(200, 0)
    }
}

func createBullet() -> SKShapeNode {
    let bullet = SKShapeNode(circleOfRadius: 2)
    bullet.fillColor = SKColor.blueColor()
    bullet.physicsBody = SKPhysicsBody(circleOfRadius: bullet.frame.height / 2)
    bullet.physicsBody?.affectedByGravity = false
    bullet.physicsBody?.dynamic = true
    bullet.physicsBody?.categoryBitMask = PhysicsCategory.Bullet
    bullet.physicsBody?.contactTestBitMask = PhysicsCategory.Ground
    bullet.physicsBody?.collisionBitMask = PhysicsCategory.Ground
    return bullet
}

The playerWeaponBarrel child node is where the bullet should spawn. What happens is that when I call the shoot() function at GameScene:

playerWeaponBarrel子节点是子弹应该生成的位置。当我在GameScene上调用shoot()函数时会发生什么:

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    /* Called when a touch begins */
    for touch: AnyObject in touches {
        let location = touch.locationInNode(self)
        let touchedNode = self.nodeAtPoint(location)

        if (touchedNode == fireButton) {
            Player.shoot(self.scene!)
        }

it just won't create the bullet at the playerWeaponBarrel. How do I make this happen?

它只是不会在playerWeaponBarrel上创建子弹。我该如何做到这一点?

1 个解决方案

#1

1  

Your problem is that the playerWeaponBarrel.position is relative to its super node, which is probably the player. But you want the bullet to be located absolutely in the scene, not relative to the player. Therefore what you need to do is convert the playerWeaponBarrel.position from its local coordinate system to the scene coordinate system:

你的问题是playerWeaponBarrel.position是相对于它的超级节点,可能是玩家。但是你希望子弹完全位于场景中,而不是相对于玩家。因此,您需要做的是将playerWeaponBarrel.position从其本地坐标系转换为场景坐标系:

bullet.position = scene.convertPoint(playerWeaponBarrel.position, fromNode: playerWeaponBarrel.parent!)

#1

1  

Your problem is that the playerWeaponBarrel.position is relative to its super node, which is probably the player. But you want the bullet to be located absolutely in the scene, not relative to the player. Therefore what you need to do is convert the playerWeaponBarrel.position from its local coordinate system to the scene coordinate system:

你的问题是playerWeaponBarrel.position是相对于它的超级节点,可能是玩家。但是你希望子弹完全位于场景中,而不是相对于玩家。因此,您需要做的是将playerWeaponBarrel.position从其本地坐标系转换为场景坐标系:

bullet.position = scene.convertPoint(playerWeaponBarrel.position, fromNode: playerWeaponBarrel.parent!)
标签：

相关文章