Swift Spritekit 改变框架形状

Question

我正在使用 Spritekit 在 Swift 中制作 IOS 游戏，玩家有一个三角形网格，我用以下代码创建:

    let viewpath = CGPathCreateMutable();

    CGPathMoveToPoint(viewpath, nil, 200, 0);

    CGPathAddLineToPoint(viewpath, nil, 0, 400);

    CGPathAddLineToPoint(viewpath, nil, 400, 400);

    CGPathAddLineToPoint(viewpath, nil, 200, 0);

    let playerviewshape = SKShapeNode(path: viewpath);

    playerviewshape.fillColor = SKColor(red: 1, green: 1, blue: 1, alpha: 0.1)

    playerviewshape.strokeColor = SKColor(red: 1, green: 1, blue: 1, alpha: 0.2)

    playerview = SKSpriteNode(texture: view.textureFromNode(playerviewshape));

    playerview.zPosition = 0;

    playerview.position = CGPoint(x: 0, y: 200);

    player.addChild(playerview);

我想知道是否有任何敌人在三角形内，因此在更新循环中我使用 if(enemy.intersectsNode(playerview)) { 但这仅检查它是否在节点框架内，这是一个围绕三角形的矩形。我尝试过使用三角形作为 SKShapeNode，也尝试过使用 containsPoint 而不是 intersectsNode。

如何更改框架/检测相交的方式，以便仅检测位于三角形内部的 Sprite ？

Answer 1

我编写了一些代码，可用于开始设置物理:

(P.S.我不知道玩家是什么类型，所以我使用playerview只是为了举个例子..)

enum CollisionTypes: UInt32 {
    case Playerview = 1 // my hero
    case WarField = 2 // the warfield 
    case Enemy1 = 4 // simple enemies type
    case Enemy2 = 8  // 2 level enemies type
    case Enemy3 = 16 // boss enemies type
    case Enemy4 = 32 // boss of the boss enemies type
}


playerview.physicsBody = SKPhysicsBody(texture: texture, size: texture.size())
playerview.physicsBody!.categoryBitMask = CollisionTypes.Playerview.rawValue
playerview.physicsBody!.contactTestBitMask = CollisionTypes.Enemy1.rawValue | CollisionTypes.Enemy2.rawValue | CollisionTypes.Enemy3.rawValue | CollisionTypes.Enemy4.rawValue
playerview.physicsBody!.collisionBitMask = 0

func didBeginContact(contact: SKPhysicsContact) {
     if (contact.bodyA.categoryBitMask == CollisionTypes.Playerview.rawValue &&
            contact.bodyB.categoryBitMask == CollisionTypes.Enemy1.rawValue) {
         print("The collision was between the playerview and a enemy1")
     }
     ...
}