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  • 《AdvancED ActionScript 3.0 Animation》读书笔记(1) —— 转向行为

    1)寻找:


    public function seek(target: Vector2D): void

    {

    var desiredVelocity: Vector2D = target.subtract(_position);

    desiredVelocity.normalize();

    desiredVelocity = desiredVelocity.multiply(_maxSpeed);

    var force: Vector2D = desiredVelocity.subtract(_velocity);

    _steeringForce = _steeringForce.add(force);

    }



    2)避开:


    public function flee(target: Vector2D): void

    {

    var desiredVelocity: Vector2D = target.subtract(_position);

    desiredVelocity.normalize();

    desiredVelocity = desiredVelocity.multiply(_maxSpeed);

    var force: Vector2D = desiredVelocity.subtract(_velocity);

    _steeringForce = _steeringForce.subtract(force);

    }



    3)到达:


    public function arrive(target: Vector2D): void

    {

    var desiredVelocity: Vector2D = target.subtract(_position);

    desiredVelocity.normalize();

    var dist: Number = _position.dist(target);

    if(dist > _arrivalThreshold)

    {

    desiredVelocity = desiredVelocity.multiply(_maxSpeed);

    }

    else

    {

    desiredVelocity = desiredVelocity.multiply(_maxSpeed * dist /

    _arrivalThreshold);

    }

    var force: Vector2D = desiredVelocity.subtract(_velocity);

    _steeringForce = _steeringForce.add(force);

    }



    4)追捕:


    public function pursue(target: Vehicle): void

    {

    var lookAheadTime: Number = position.dist(target.position) / _maxSpeed;

    var predictedTarget: Vector2D =

    target.position.add(target.velocity.multiply(lookAheadTime));

    seek(predictedTarget);

    }



    5)躲避:


    public function evade(target: Vehicle): void

    {

    var lookAheadTime: Number = position.dist(target.position) / _maxSpeed;

    var predictedTarget: Vector2D =

    target.position.add(target.velocity.multiply(lookAheadTime));

    flee(predictedTarget);

    }



    6)漫游:




    init (){

    private var _wanderAngle: Number = 0;

    private var _wanderDistance: Number = 10;

    private var _wanderRadius: Number = 5;

    private var _wanderRange: Number = 1;

    }


    public function wander(): void

    {

    var center: Vector2D = velocity.clone().normalize().multiply(_wanderDistance);

    var offset: Vector2D = new Vector2D(0);

    offset.length = _wanderRadius;

    offset.angle = _wanderAngle;

    _wanderAngle += Math.random() * _wanderRange - _wanderRange * .5;

    var force: Vector2D = center.add(offset);

    _steeringForce = _steeringForce.add(force);

    }


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  • 原文地址:https://www.cnblogs.com/cly84920/p/4426490.html
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