Question

我正在让代理人遵循GKPath，向其行为添加目标toFollow：GKPath。一切正常，但是当到达路径上的目标点时，代理继续以类似8的形状移动。如何在到达GKPath上的目标点时阻止代理漫游？

我想到的一个解决方案是设置另一个目标toReachTargetSpeed：0.0接近目标点时。但是，我不确定最佳做法是什么，因为没有内置的方法来确定目标何时“完成”。

我是否使用IF语句检查每次更新时的目标距离：？性能怎么样？
我是否使用某种GKRule？

非常感谢您的建议。感谢。

Answer 1

我选择了第一个选项，即在movingComponent更新功能中跟踪目标距离：

override func update(deltaTime seconds: TimeInterval) {
    guard let entity = self.entity as? BaseEntity else { return }
    if entity.moving {
        let targetPoint = CGPoint(x: 100, y: 100)
        let distanceToTarget = distanceFrom(point: point)
        if distanceToTarget < GameConfiguration.Movement.targetProximity {
            stopMovement(afterTraversing: distanceToTarget)
        }
    }
}

func distanceFrom(point: CGPoint) -> Float {
    guard let entity = self.entity as? BaseEntity else { return CGFloat.greatestFiniteMagnitude }
    let dx = point.x - entity.visualComponent.node.position.x
    let dy = point.y - entity.visualComponent.node.position.y
    return hypotf(Float(dx), Float(dy))
}

当代理程序足够接近目标时，运行stopMovement函数。反过来，这将计算横穿目标距离（具有恒定速度）所需的时间，并将定时器以确定何时强制停止代理：

func stopMovement(afterTraversing distance: Float) {
    guard let entity = self.entity as? BaseEntity else { return }
    guard (entity.moving) else { return }
    guard let behavior = entity.agent.behavior as? MovingBehavior else { return }
    let timeToTarget = TimeInterval(distance / entity.agent.maxSpeed)
    Timer.scheduledTimer(withTimeInterval: timeToTarget, repeats: false, block: {_ in
        behavior.stopMoving()
        entity.agent.maxSpeed = 0.0
        entity.moving = false
    })
}

class MovingBehavior: GKBehavior {

    var reachMaxSpeed: GKGoal
    var followPathGoal: GKGoal
    var stopMovingGoal = GKGoal(toReachTargetSpeed: 0.0)

    init(path: GKPath, target: GKGraphNode, maxSpeed: Float) {
        reachMaxSpeed = GKGoal(toReachTargetSpeed: maxSpeed)
        followPathGoal = GKGoal(toFollow: path, maxPredictionTime: 1.0, forward: true)
        super.init()
        setWeight(1.0, for: reachMaxSpeed)
        setWeight(0.8, for: followPathGoal)
        setWeight(0.0, for: stopMovingGoal)
    }

    func stopMoving() {
        setWeight(0.0, for: reachMaxSpeed)
        setWeight(0.0, for: followPathGoal)
        setWeight(1.0, for: stopMovingGoal)
    }
}

GameplayKit＆gt;让代理在目标跟随路径后停止移动

1 个答案: