swift - 触摸时的 Sprite 节点第一个仅采用物理主体

Question

我正在使用 Xcode 8.1 Swift 3 制作小型弹跳游戏。

玩家应该在弹跳球周围创建墙壁，并且这个球应该在每面墙上弹跳。

触摸按下时，我移动到点，触摸结束时，我在两个触摸开始和结束之间创建一个线共享节点。

我添加了节点所需的物理特性，然后向该节点添加了子节点(请参阅下面的节点)。

发生的情况是，对于每次触摸开始和触摸结束，“Swift”绘制线节点并将其附加到自身，但只有第一个节点反弹球。 第一条线之后的所有线(墙)都不影响球。

这是我的 GameScene Swift 文件代码:

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate {
// vars lets and nodes
let startingBall = SKShapeNode(circleOfRadius: 10)
let myPath = CGMutablePath()
let ballCategory : UInt32 = 1
let wallCategory : UInt32 = 2

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for t in touches {
        myPath.move(to: t.location(in: self))
    }
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    for t in touches {
        myPath.addLine(to: t.location(in: self))
        let wallNode = SKShapeNode(path: myPath)
        wallNode.lineWidth = 5.0
        wallNode.fillColor = SKColor.green
        wallNode.strokeColor = SKColor.green
        wallNode.physicsBody = SKPhysicsBody(edgeLoopFrom: myPath)
        wallNode.physicsBody?.categoryBitMask = wallCategory
        self.addChild(wallNode)
    }
}

override func didMove(to view: SKView) {

    self.physicsBody = SKPhysicsBody(edgeLoopFrom: self.frame)
    self.physicsBody?.categoryBitMask = wallCategory
    startingBall.fillColor = SKColor.red
    startingBall.position = CGPoint(x: self.frame.width/2, y: self.frame.height/2)
    startingBall.physicsBody = SKPhysicsBody(circleOfRadius: 10)
    startingBall.physicsBody?.affectedByGravity = false
    startingBall.physicsBody?.isDynamic = true
    startingBall.physicsBody?.restitution = 1.0
    startingBall.physicsBody?.friction = 0.0
    startingBall.physicsBody?.linearDamping = 0.0
    startingBall.physicsBody?.angularDamping = 0.0
    self.addChild(startingBall)

    startingBall.physicsBody?.applyImpulse(CGVector(dx: 3.0, dy: 3.0))
}
}

Answer 1

谢谢大家，我已修复它

实际上可变路径 myPath 定义触摸开始线和触摸结束线之间的线，仅绘制形状节点...而为从节点到节点的每个触摸系列创建物理边缘...

逐步 1-我添加了起点和终点变量 2-拾取触摸开始中的起始节点和触摸结束中的结束节点 3-我为点到点的起始节点和结束节点设置物理体

1-

var startPoint : CGPoint = CGPoint.zero
var endPoint : CGPoint = CGPoint.zero

2-..

override func touchesBegan(_ touches: Set<UITouch>, with event:   UIEvent?) {
    for t in touches {
        startPoint = t.location(in: self)
        myPath.move(to: t.location(in: self))
    }
}

        endPoint = t.location(in: self)

3-..

        wallNode.physicsBody = SKPhysicsBody(edgeFrom: startPoint, to:  endPoint)

如需帮助，您可以在skiver中将显示物理设置为true

    skview.showsPhysics = true

谢谢