public void Update(GameTime gameTime, GraphicsDevice graphics)
{
steering = Steering.None();
//atualizar posição e orientação
movementInfo.position += movementInfo.velocity * gameTime.ElapsedGameTime.Milliseconds;
movementInfo.orientation += movementInfo.rotation * gameTime.ElapsedGameTime.Milliseconds;
//aplicar atrito
movementInfo.velocity *= 0.95f;
movementInfo.rotation *= 0.95f;
//calcular novo movimento
steering = velocity.Update(movementInfo, target.getMovementInfo());
movementInfo.velocity += steering.linear;
movementInfo.rotation += steering.angular;
//garantir velocidade máxima
if (movementInfo.velocity.Length() > maxSpeed)
{
movementInfo.velocity.Normalize();
movementInfo.velocity *= maxSpeed;
}
base.Update(graphics);
}
protected override Steering getSteering()
{
Steering steering = new Steering();
//não mexer se o alvo não se mexe
if (target.velocity.Length() == 0)
{
return(Steering.None());
}
//acelerar e tentar obter a velicidade desejada
steering.linear = target.velocity - origin.velocity;
steering.linear /= timeToTarget;
//não acelerar demasiado
if (steering.linear.Length() > maxAcceleration)
{
steering.linear.Normalize();
steering.linear *= maxAcceleration;
}
steering.angular = 0;
return(steering);
}
protected override Steering getSteering()
{
Steering steering = new Steering();
//calcular distancia da rotacao
float rotation = origin.orientation - target.orientation;
//normalizar rotação entre -PI e PI
rotation = Utils.normAngle(rotation);
//calcular distancia (angulo) absoluta
float rotationSize = Math.Abs(rotation);
float targetRotation = 0;
//já chegamos?
if (rotationSize < targetRadius)
{
return(Steering.None());
}
//estamos muito longe?
if (rotationSize > slowRadius)
{
targetRotation = maxRotation;
}
else
{
targetRotation = maxRotation * rotationSize / slowRadius;
}
//rotação de destino combina velocidade com direção
targetRotation *= Utils.signal(rotation);
//aceleração necessária para obter rotação desejada
steering.angular = targetRotation - rotation;
steering.angular /= timeToTarget;
//mas não fazer a rotação demasiado rápida
float angularAcceleration = Math.Abs(steering.angular);
if (angularAcceleration > maxAngAccel)
{
steering.angular /= angularAcceleration;
steering.angular *= maxAngAccel;
}
steering.linear = Vector3.Zero;
return(steering);
}
public void Update(GameTime gameTime, GraphicsDevice graphics)
{
//atualizar posição e orientação
movementInfo.position += movementInfo.velocity * gameTime.ElapsedGameTime.Milliseconds;
movementInfo.orientation += movementInfo.rotation * gameTime.ElapsedGameTime.Milliseconds;
//aplicar atrito
movementInfo.velocity *= 0.95f;
movementInfo.rotation *= 0.95f;
//calcular novo movimento
steering = Steering.None();
if (Keyboard.GetState().IsKeyDown(Keys.W))
{
//Frente
steering.linear = Vector3.Normalize(Utils.orientationToVector(movementInfo.orientation));
}
if (Keyboard.GetState().IsKeyDown(Keys.S))
{
//Trás
steering.linear = -Vector3.Normalize(Utils.orientationToVector(movementInfo.orientation));
}
if (Keyboard.GetState().IsKeyDown(Keys.A))
{
//Virar à esquerda
steering.angular = -0.0001f;
}
if (Keyboard.GetState().IsKeyDown(Keys.D))
{
//Virar à direita
steering.angular = 0.0001f;
}
movementInfo.velocity += steering.linear;
movementInfo.rotation += steering.angular;
//garantir velocidade máxima
if (movementInfo.velocity.Length() > maxSpeed)
{
movementInfo.velocity.Normalize();
movementInfo.velocity *= maxSpeed;
}
base.Update(graphics);
}
