/// <summary>
/// 逃避
/// </summary>
/// <returns></returns>
public Vector2 Evade(MoveEntity _target)
{
Vector2 toTarget = _target.Position - m_entity.Position;
//时间与距离成正比，与速度成反比
float lookAheadTime = toTarget.magnitude / (m_entity.MaxVelocity * _target.Speed);
lookAheadTime += TurnAroundTime(_target.Position);
return(Flee(_target.Position + _target.Velocity * lookAheadTime));
}
/// <summary>
/// 追逐
/// </summary>
/// <returns></returns>
public Vector2 Pursute(MoveEntity _target)
{
Vector2 toEvader = _target.Position - m_entity.Position;
//计算与被追逐者朝向的夹角
float relativeHeading = Vector2.Dot(_target.Heading, m_entity.Heading);
//如果在被追逐者在前方20度以内
if (Vector2.Dot(toEvader, m_entity.Heading) > 0 && relativeHeading < -0.95)
{
return(Seek(_target.Position));
}
//如果不在前方20度以内,预测方向
//预测的时间与距离成正比，与速度成反比
float lookAheadTime = toEvader.magnitude / (m_entity.MaxVelocity + _target.Speed);
lookAheadTime += TurnAroundTime(_target.Position);
return(Seek(_target.Position + _target.Velocity * lookAheadTime));
}
public SteeringBehaviour(MoveEntity _ent)
{
m_entity = _ent;
m_transform = m_entity.transform;
wandarTarget = m_transform.position;
}