protected virtual void Update()
{
//keep a record of its old position so we can update its cell later
//in this method
Vector2 OldPos = Position;
Vector2 SteeringForce = new Vector2();
//calculate the combined force from each steering behavior in the
//vehicle's list
SteeringForce = Behaviors.SummingForce();
//Acceleration = Force/Mass
Vector2 acceleration = SteeringForce / _mass;
//update velocity
_velocity += acceleration * Time.deltaTime;
//make sure vehicle does not exceed maximum velocity
_velocity = _velocity.Truncate(_maxSpeed);
//把本地速度转成世界坐标
Vector4 worldVec = new Vector4(_velocity.x, _velocity.y, 0, 1);
//update the position
Position += worldVec.ToVector2() * Scale * Time.deltaTime;
//update the heading if the vehicle has a non zero velocity
if (_velocity.sqrMagnitude > float.Epsilon)
{
_heading = _velocity.normalized;
_side = _heading.Perpendicular();
}
//EnforceNonPenetrationConstraint(this, World()->Agents());
/*
* //treat the screen as a toroid
* WrapAround(m_vPos, m_pWorld->cxClient(), m_pWorld->cyClient());
*/
//update the vehicle's current cell if space partitioning is turned on
/*
* if (Steering.IsSpacePartitioningOn())
* {
* World.CellSpace.UpdateEntity(this, OldPos);
* }
*/
if (IsSmoothingOn())
{
//_smoothedHeading = _headingSmoother.Update(Heading);
}
transform.rotation = GetRotation();
}
