Vector3 UnitAiMoonGuard::avoidShips(const WorldInterface& world, const Vector3& originalVelocity)
{
Vector3 agentPosition = getShip().getPosition();
vector<PhysicsObjectId> shipIDs = world.getShipIds(agentPosition, SAFE_DISTANCE);
unsigned int amount = shipIDs.size();
if (amount == 1) {
return originalVelocity;
}
PhysicsObjectId closestID = PhysicsObjectId::ID_NOTHING;
double closestDistance = -1;
PhysicsObjectId agentID = getShip().getId();
for (unsigned int i = 0; i < amount; i++) {
PhysicsObjectId shipID = shipIDs[i];
if (agentID != shipID) {
Vector3 shipPosition = world.getPosition(shipIDs[i]);
double distance = agentPosition.getDistanceSquared(shipPosition);
if (closestDistance < 0) {
closestDistance = distance;
closestID = shipIDs[i];
}
else if (distance <= closestDistance) {
closestDistance = distance;
closestID = shipIDs[i];
}
}
}
if (closestDistance == -1) {
return originalVelocity;
}
return m_steering_behaviour.evade(world, closestID);
}
void UnitAiMoonGuard :: run (const WorldInterface& world)
{
assert(world.isAlive(getShipId()));
scan(world);
Vector3 v = getShip().getVelocity();
if (nearestEnemyShip != PhysicsObjectId::ID_NOTHING)
{
v = chargeAtTarget(world, nearestEnemyShip, v);
shootAtShip(world, nearestEnemyShip);
}
else
{
Vector3 moon_pos = world.getPosition(moon);
double moon_radius = world.getRadius(moon);
v = steeringBehaviour->patrolSphere(world,
moon_pos,
moon_radius,
PLANETOID_AVOID_DISTANCE);
//printf("Patrolling...\n");
}
v = avoidShips(world, v);
v = avoidRingParticles(world, v);
getShipAi().setDesiredVelocity(v);
}
void Ship::update(WorldInterface& world)
{
if (m_health <= 0 && m_status == dying){
m_status = dead;
world.addExplosion(getPositionPrevious(), EXPLOSION_SIZE, 0);
}
if (m_status == alive){
if (isUnitAiSet()){
double duration = TimeSystem::getFrameDuration();
m_coordinate.rotateToVector(m_desired_velocity, duration*m_rotation_rate);
changeSpeed(m_desired_velocity.getNorm(), duration*m_acceleration);
if (m_fire_bullet_desired && isBulletReady()){
world.addBullet(getPosition(), m_coordinate.getForward(), m_id);
m_fire_bullet_desired = false;
reloadBullet();
}
}
updateBasic();
m_reloadTimer.update();
}
else if (m_health > 0 && m_status == dead){
m_status = alive;
Vector3 position = m_coordinate.getPosition();
position -= 500 * m_coordinate.getForward();
m_coordinate.setPosition(position);
}
}
void UnitAiMoonGuard::chooseTarget(const WorldInterface& world)
{
const Vector3& ship_position = getShip().getPosition();
const Vector3& ship_forward = getShip().getForward();
unsigned int ship_fleet = getShipId().m_fleet;
vector<PhysicsObjectId> v_ids = world.getShipIds(ship_position, SCAN_RADIUS);
m_id_target = PhysicsObjectId::ID_NOTHING;
double best_angle = VERY_LARGE_ANGLE;
for (unsigned int i = 0; i < v_ids.size(); i++)
{
PhysicsObjectId other_id = v_ids[i];
if (other_id.m_fleet != ship_fleet)
{
// we found an enemy ship
Vector3 other_position = world.getPosition(other_id);
Vector3 direction_to_other = other_position - ship_position;
double angle_to_other = direction_to_other.getAngleSafe(ship_forward);
if (angle_to_other < best_angle)
{
m_id_target = other_id;
best_angle = angle_to_other;
}
}
// else ship is part of our fleet, so ignore it
}
}
void Ship :: update (WorldInterface& r_world)
{
if (isUnitAiSet())
{
if (!desired_velocity.isZero())
{
double theta = max_rotation_rate * TimeSystem::getFrameDuration();
if(theta > 0.0)
{
rotateTowards(desired_velocity.getNormalized(), theta);
}
double delta = max_acceleration * TimeSystem::getFrameDuration();
if(delta > 0.0)
{
double currentSpeed = getSpeed();
double desiredSpeed = desired_velocity.getNorm();
if (currentSpeed < desiredSpeed)
{
currentSpeed += delta;
if (currentSpeed > desiredSpeed) currentSpeed = desiredSpeed;
setSpeed(currentSpeed);
}
else if (currentSpeed > desiredSpeed)
{
currentSpeed -= delta;
if (currentSpeed < desiredSpeed) currentSpeed = desiredSpeed;
setSpeed(currentSpeed);
}
}
}
if (wantsToFire && isReloaded())
{
r_world.addBullet(getPosition(), getForward(), getId());
wantsToFire = false;
markReloading();
}
}
if(isAlive() && isDying())
{
r_world.addExplosion(getPositionPrevious(), getRadius() * EXPLOSION_SIZE_FACTOR, 0);
m_is_dead = true;
// no further updates
assert(invariant());
return;
}
if(isAlive())
{
updateBasic(); // moves the Ship
m_reload_timer += TimeSystem::getFrameDuration();
}
assert(invariant());
}
Vector3 UnitAiMoonGuard::avoidParticles(const WorldInterface& world, const Vector3& originalVelocity) {
Vector3 agentPosition = getShip().getPosition();
if (world.getRingDensity(agentPosition) <= 0) {
return originalVelocity;
}
vector<WorldInterface::RingParticleData> particles = world.getRingParticles(agentPosition, SAFE_DISTANCE);
unsigned int amount = particles.size();
if (amount == 0) {
return originalVelocity;
}
WorldInterface::RingParticleData cloestParticle = particles[0];
double closestDistance = cloestParticle.m_position.getDistanceSquared(agentPosition);
for (unsigned int i = 1; i < amount; i++) {
WorldInterface::RingParticleData particle = particles[i];
double distance = particle.m_position.getDistanceSquared(agentPosition);
if (distance < closestDistance) {
cloestParticle = particle;
closestDistance = distance;
}
}
Vector3 avoidVelocity = m_steering_behaviour.avoid(world, avoidVelocity,
cloestParticle.m_position,
cloestParticle.m_radius,
cloestParticle.m_radius,
SAFE_DISTANCE);
double speed = getShip().getSpeedMax() / amount * SAFE_DISTANCE / 100;
return avoidVelocity.getCopyWithNorm(speed);
}
UnitAiMoonGuard::UnitAiMoonGuard(const AiShipReference& ship,
const WorldInterface& world,
const PhysicsObjectId& id_moon)
: UnitAiSuperclass(ship), m_id_target(PhysicsObjectId::ID_NOTHING),
m_steering_behaviour(ship.getId()), m_scan_counter(0),
m_moon_id(id_moon), mp_world(&world)
{
assert(ship.isShip());
assert(id_moon.m_type == PhysicsObjectId::TYPE_PLANETOID);
assert(world.isAlive(id_moon));
assert(world.isPlanetoidMoon(id_moon));
}
void UnitAiMoonGuard::patrolMoon(const WorldInterface& world, const PhysicsObjectId& moonID)
{
Vector3 planetoid_center = world.getPosition(moonID);
double planetoid_radius = world.getRadius(moonID);
Vector3 desired_velocity = m_steering_behaviour.patrolSphere(world, planetoid_center,
planetoid_radius + PLANETOID_CLEARANCE,
planetoid_radius + Const::SHELL_THICKNESS);
Vector3 avoid_velocity = avoidPlanets(world, desired_velocity);
avoid_velocity = avoidParticles(world, avoid_velocity);
avoid_velocity = avoidShips(world, avoid_velocity);
getShipAi().setDesiredVelocity(avoid_velocity);
}
Vector3 UnitAiMoonGuard::avoidPlanets(const WorldInterface& world, const Vector3& originalVelocity)
{
PhysicsObjectId planetoid_id = world.getNearestPlanetoidId(getShip().getPosition());
Vector3 planetoid_center = world.getPosition(planetoid_id);
double planetoid_radius = world.getRadius(planetoid_id);
return m_steering_behaviour.avoid(world,
originalVelocity,
planetoid_center,
planetoid_radius,
PLANETOID_CLEARANCE,
PLANETOID_AVOID_DISTANCE);
}
Vector3 UnitAiMoonGuard::avoidPlanetoids(const WorldInterface &world, const Vector3& orig_velocity)
{
Vector3 planetoid_pos = world.getPosition(nearestPlanetoid);
double planetoid_radius = world.getRadius(nearestPlanetoid);
Vector3 v = steeringBehaviour->avoid(world,
orig_velocity,
planetoid_pos,
planetoid_radius,
PLANETOID_CLEARANCE,
PLANETOID_AVOID_DISTANCE);
//printf("Avoiding Planetoid\n");
return v;
}
UnitAiMoonGuard :: UnitAiMoonGuard (const AiShipReference& ship,
const WorldInterface& world,
const PhysicsObjectId& id_moon)
: UnitAiSuperclass(ship)
{
assert(ship.isShip());
assert(id_moon.m_type == PhysicsObjectId::TYPE_PLANETOID);
assert(world.isAlive(id_moon));
assert(world.isPlanetoidMoon(id_moon));
steeringBehaviour = new FleetName::SteeringBehaviour(ship.getId());
moon = id_moon;
scanCount = rand() % SCAN_COUNT_MAX;
}
void UnitAiMoonGuard::run(const WorldInterface& world)
{
assert(world.isAlive(getShipId()));
//
// Scan for enemies evey few frames. We use a counter to
// know which frames to scan on.
//
m_scan_counter++;
if (m_scan_counter >= SCAN_COUNT_MAX)
{
chooseTarget(world);
m_scan_counter = 0;
}
//
// Check to make sure the target is still alive. If we
// didn't scan this frame, it might have died since we
// last checked.
//
if (m_id_target != PhysicsObjectId::ID_NOTHING &&
!world.isAlive(m_id_target))
{
// give up on dead target
m_id_target = PhysicsObjectId::ID_NOTHING;
}
//
// If we have a target, shoot at it! Otherwise, just stop and
// wait. If we don't move while there is no target, we
// can't hit anything, so we won't die.
//
if (m_id_target != PhysicsObjectId::ID_NOTHING)
{
// if we have a living target
assert(world.isAlive(m_id_target));
steerToTargetAndShoot(world);
}
else
{
patrolMoon(world, m_moon_id);
}
}
void UnitAiMoonGuard::shootAtShip(const WorldInterface& world, const PhysicsObjectId& target)
{
if (!world.isAlive(target)) return;
Vector3 target_pos = world.getPosition(target);
Vector3 target_vel = world.getVelocity(target);
Vector3 aim_dir = steeringBehaviour->getAimDirection(getShip().getPosition(),
Bullet::SPEED,
target_pos,
target_vel);
double angle = getShip().getVelocity().getAngleSafe(aim_dir);
if (angle <= SHOOT_ANGLE_RADIANS_MAX && getShip().isReloaded())
{
getShipAi().markFireBulletDesired();
//printf("\tShooting at (%f, %f, %f)\n", target_pos.x, target_pos.y, target_pos.z);
};
}
Vector3 SteeringBehaviour :: flee (const WorldInterface& world,
const PhysicsObjectId& id_target)
{
assert(id_target != PhysicsObjectId::ID_NOTHING);
// no initialization needed
m_steering_behaviour = FLEE;
if(!world.isAlive(id_target))
{
assert(invariant());
return Vector3::ZERO;
}
assert(world.isAlive(id_target));
Vector3 result = flee(world, world.getPosition(id_target));
assert(invariant());
return result;
}
void UnitAiMoonGuard::steerToTargetAndShoot(const WorldInterface& world)
{
assert(m_id_target != PhysicsObjectId::ID_NOTHING);
assert(world.isAlive(m_id_target));
Vector3 agent = getShip().getPosition();
Vector3 agent_velocity = world.getVelocity(getShip().getId());
Vector3 target = world.getPosition(m_id_target);
Vector3 target_velocity = world.getVelocity(m_id_target);
Vector3 desired_velocity;
double agent_max_speed = world.getShipSpeedMax(getShip().getId());
double fromAgentToTarget = agent.getAngle(target);
double fromAgentToTargetFront = agent.getAngle(target + target_velocity);
if (fromAgentToTargetFront < fromAgentToTarget) {
desired_velocity = m_steering_behaviour.seek(world, m_id_target);
}
else {
desired_velocity = m_steering_behaviour.getAimDirection(agent, Bullet::SPEED,
target, target_velocity);
if (desired_velocity == Vector3::ZERO) {
desired_velocity = m_steering_behaviour.pursue(world, m_id_target);
}
else {
desired_velocity.setNorm(agent_max_speed);
}
}
Vector3 avoid_velocity = avoidPlanets(world, desired_velocity);
avoid_velocity = avoidParticles(world, avoid_velocity);
avoid_velocity = avoidShips(world, avoid_velocity);
getShipAi().setDesiredVelocity(avoid_velocity);
double angle = agent_velocity.getAngle(desired_velocity);
double distance = target.getDistanceSquared(agent);
if (angle <= SHOOT_ANGLE_RADIANS_MAX && distance < FIRE_RANGE)
{
getShipAi().markFireBulletDesired();
}
}
Vector3 SteeringBehaviour :: explore (const WorldInterface& world,
double distance_new_position_min,
double distance_new_position_max)
{
assert(distance_new_position_min >= 0.0);
assert(distance_new_position_min <= distance_new_position_max);
assert(distance_new_position_min > EXPLORE_DISTANCE_NEW_POSITION);
double position_distance = (distance_new_position_max + distance_new_position_min) * 0.5;
double position_distance_tolerance = (distance_new_position_max - distance_new_position_min) * 0.5;
bool is_new_position_needed = false;
if(m_steering_behaviour != EXPLORE ||
m_desired_distance != position_distance ||
m_desired_distance_tolerance != position_distance_tolerance)
{
m_steering_behaviour = EXPLORE;
m_desired_distance = position_distance;
m_desired_distance_tolerance = position_distance_tolerance;
is_new_position_needed = true;
}
if(!world.isAlive(m_id_agent))
{
// the explore position doesn't matter at this point
assert(invariant());
return Vector3::ZERO;
}
Vector3 agent_position = world.getPosition(m_id_agent);
double agent_speed_max = world.getShipSpeedMax(m_id_agent);
assert(agent_speed_max >= 0.0);
if(agent_position.isDistanceLessThan(m_explore_position, EXPLORE_DISTANCE_NEW_POSITION) ||
is_new_position_needed)
{
m_explore_position = calculateExplorePosition(agent_position);
}
return (m_explore_position - agent_position).getCopyWithNorm(agent_speed_max);
}
Vector3 SteeringBehaviour :: escort (const WorldInterface& world,
const PhysicsObjectId& id_target,
const Vector3& offset)
{
assert(id_target != PhysicsObjectId::ID_NOTHING);
// no initialization needed
m_steering_behaviour = ESCORT;
//
// This is a variation on the arrive steering behaviour.
// First we work out the desired position from the
// offset. Then we arrive at that position. Finally we
// add on the velocity of the target and truncate to our
// maximum speed.
//
// A more sophisticated implementation would use a form of
// arrive based on pursue instead of seek. Or maybe this
// already happens; I'm not sure. In either case,
// slowing down for arrival messes up time predictions.
//
if(!world.isAlive(m_id_agent) ||
!world.isAlive( id_target))
{
assert(invariant());
return Vector3::ZERO;
}
assert(world.isAlive(m_id_agent ));
assert(world.isAlive( id_target));
Vector3 agent_position = world.getPosition(m_id_agent);
Vector3 target_velocity = world.getVelocity( id_target);
Vector3 escort_position = calculateEscortPosition(world, id_target, offset);
if(agent_position == escort_position)
{
// we are in the correct position, so just match speeds
assert(invariant());
return target_velocity;
}
double agent_speed_max = world.getShipSpeedMax(m_id_agent);
assert(agent_speed_max >= 0.0);
double agent_acceleration = world.getShipSpeedMax(m_id_agent);
assert(agent_acceleration >= 0.0);
double current_distance = agent_position.getDistance(escort_position);
double desired_relative_speed = calculateMaxSafeSpeed(current_distance, agent_acceleration);
Vector3 desired_relative_velocity = (escort_position - agent_position).getCopyWithNorm(desired_relative_speed);
Vector3 desired_agent_velocity = desired_relative_velocity + target_velocity;
// limit desired velocity to maximum speed
assert(invariant());
return desired_agent_velocity.getTruncated(agent_speed_max);
}
Vector3 SteeringBehaviour :: calculateEscortPosition (const WorldInterface& world,
const PhysicsObjectId& id_target,
const Vector3& offset) const
{
assert(m_steering_behaviour == ESCORT);
assert(id_target != PhysicsObjectId::ID_NOTHING);
if(!world.isAlive(id_target))
return Vector3::ZERO;
Vector3 target_position = world.getPosition(id_target);
Vector3 target_forward = world.getForward (id_target);
Vector3 target_up = world.getUp (id_target);
Vector3 target_right = world.getRight (id_target);
return target_position +
target_forward * offset.x +
target_up * offset.y +
target_right * offset.z;
}
Vector3 UnitAiMoonGuard::chargeAtTarget(const WorldInterface& world, const PhysicsObjectId& target, const Vector3& orig_velocity)
{
if (!world.isAlive(target))
{
return orig_velocity;
}
Vector3 unit_pos = getShip().getPosition();
Vector3 target_pos = world.getPosition(target);
Vector3 target_forward = world.getForward(target);
//Vector3 desired_velocity = steeringBehaviour->seek(world, target);
Vector3 desired_velocity = steeringBehaviour->aim(world, target, Bullet::SPEED);
//Vector3 desired_velocity = steeringBehaviour->escort(world, target, -target_forward * 50);
Vector3 v = avoidPlanetoids(world, desired_velocity);
//printf("\tRamming\n");
return v;
}
void UnitAiMoonGuard::scan(const WorldInterface& world)
{
scanCount++;
if (scanCount == SCAN_COUNT_MAX)
{
//printf("Scanning...\n");
Vector3 ship_pos = getShip().getPosition();
nearbyShips = world.getShipIds(ship_pos, SCAN_DISTANCE_SHIP);
getClosestShip(world);
getClosestEnemyShip(world);
Vector3 position = ship_pos + (getShip().getForward() * 500.f);
nearbyRingParticles = world.getRingParticles(position, SCAN_DISTANCE_RING_PARTICLE);
nearestPlanetoid = world.getNearestPlanetoidId(ship_pos);
scanCount = 0;
}
}
Vector3 UnitAiMoonGuard::avoidShips(const WorldInterface &world, const Vector3& orig_velocity)
{
if (nearestShip == PhysicsObjectId::ID_NOTHING ||
!world.isAlive(nearestShip) ||
nearestShip == nearestEnemyShip)
{
return orig_velocity;
}
Vector3 target_pos = world.getPosition(nearestShip);
double target_radius = world.getRadius(nearestShip);
Vector3 v = steeringBehaviour->avoid(world,
orig_velocity,
target_pos,
target_radius,
SHIP_CLEARANCE,
SHIP_AVOID_DISTANCE);
//printf("\tAvoiding Ships\n");
return v;
}
void UnitAiMoonGuard::getClosestEnemyShip(const WorldInterface& world)
{
PhysicsObjectId nearestShip;
Vector3 ship_pos = getShip().getPosition();
double min_distance = std::numeric_limits<double>::max();
nearestShip = PhysicsObjectId::ID_NOTHING;
for (int i = 0; i < nearbyShips.size(); i++)
{
if (!world.isAlive(nearbyShips[i])) continue;
if (nearbyShips[i].m_fleet == getShipId().m_fleet) continue;
double temp = ship_pos.getDistanceSquared(world.getPosition(nearbyShips[i]));
if (temp < min_distance)
{
min_distance = temp;
nearestShip = nearbyShips[i];
}
}
this->nearestEnemyShip = nearestShip;
}
Vector3 SteeringBehaviour :: arrive (const WorldInterface& world,
const Vector3& target_position)
{
// no initialization needed
m_steering_behaviour = ARRIVE;
PhysicsObjectId id_agent = m_id_agent;
if(!world.isAlive(id_agent))
{
assert(invariant());
return Vector3::ZERO;
}
Vector3 agent_position = world.getPosition(id_agent);
if(agent_position == target_position)
{
assert(invariant());
return Vector3::ZERO;
}
double agent_speed = world.getShipSpeedMax(id_agent);
assert(agent_speed >= 0.0);
double agent_acceleration = world.getShipAcceleration(id_agent);
assert(agent_acceleration >= 0.0);
double distance = agent_position.getDistance(target_position);
double max_safe_speed = calculateMaxSafeSpeed(distance, agent_acceleration);
if(max_safe_speed < agent_speed)
agent_speed = max_safe_speed;
assert(agent_speed >= 0.0);
assert(agent_speed <= max_safe_speed);
assert(invariant());
return (target_position - agent_position).getCopyWithNorm(agent_speed);
}
void Bullet :: update (WorldInterface& r_world)
{
// explode if out of lifespan (or markDead(false) was called)
if(isAlive() && isDying())
{
r_world.addExplosion(getPosition(), EXPLOSION_SIZE, 0);
m_is_dead = true;
// no further updates
return;
}
if (isAlive())
updateBasic(); // moves the Bullet
}
Vector3 SteeringBehaviour :: flee (const WorldInterface& world,
const Vector3& target_position)
{
// no initialization needed
m_steering_behaviour = FLEE;
if(!world.isAlive(m_id_agent))
{
assert(invariant());
return Vector3::ZERO;
}
Vector3 agent_position = world.getPosition(m_id_agent);
if(agent_position == target_position)
{
assert(invariant());
return Vector3::ZERO;
}
double agent_speed_max = world.getShipSpeedMax(m_id_agent);
assert(agent_speed_max >= 0.0);
return (agent_position - target_position).getCopyWithNorm(agent_speed_max);
}
Vector3 SteeringBehaviour :: evade (const WorldInterface& world,
const PhysicsObjectId& id_target)
{
assert(id_target != PhysicsObjectId::ID_NOTHING);
// no initialization needed
m_steering_behaviour = EVADE;
if(!world.isAlive(m_id_agent) ||
!world.isAlive( id_target))
{
assert(invariant());
return Vector3::ZERO;
}
Vector3 agent_position = world.getPosition(m_id_agent);
Vector3 target_position = world.getPosition( id_target);
if(agent_position == target_position)
{
assert(invariant());
return Vector3::ZERO;
}
assert(world.isAlive(m_id_agent ));
assert(world.isAlive( id_target));
Vector3 target_velocity = world.getVelocity(id_target);
double agent_speed_max = world.getShipSpeedMax(m_id_agent);
assert(agent_speed_max >= 0.0);
Vector3 aim_direction = getAimDirection(agent_position,
agent_speed_max,
target_position,
target_velocity);
if(aim_direction.isZero())
{
assert(invariant());
return (agent_position - target_position).getCopyWithNorm(agent_speed_max);
}
else
{
assert(invariant());
return aim_direction * -agent_speed_max;
}
}
Vector3 UnitAiMoonGuard::avoidRingParticles(const WorldInterface& world, const Vector3& orig_velocity)
{
if (nearbyRingParticles.size() == 0)
{
return orig_velocity;
}
RingParticleData nearestParticle;
Vector3 ship_pos = getShip().getPosition();
double min_distance = ship_pos.getDistanceSquared(nearbyRingParticles[0].m_position);
nearestParticle = nearbyRingParticles[0];
for (int i = 1; i < nearbyRingParticles.size(); i++)
{
double temp = ship_pos.getDistanceSquared(nearbyRingParticles[0].m_position);
if (temp < min_distance)
{
min_distance = temp;
nearestParticle = nearbyRingParticles[i];
}
}
Vector3 v = steeringBehaviour->avoid(world,
orig_velocity,
nearestParticle.m_position,
nearestParticle.m_radius,
RING_PARTICLE_CLEARANCE,
RING_PARTICLE_AVOID_DISTANCE);
double ringDensity = world.getRingDensity(ship_pos);
if (ringDensity >= 1)
{
v -= (v * ringDensity/100);
}
//printf("Avoiding Ring Particles\n");
return v;
}
Vector3 SteeringBehaviour :: aim (const WorldInterface& world,
const PhysicsObjectId& id_target,
double shot_speed)
{
assert(id_target != PhysicsObjectId::ID_NOTHING);
assert(shot_speed >= 0.0);
// no initialization needed
m_steering_behaviour = AIM;
if(!world.isAlive(m_id_agent) ||
!world.isAlive( id_target))
{
assert(invariant());
return Vector3::ZERO;
}
Vector3 agent_position = world.getPosition(m_id_agent);
Vector3 target_position = world.getPosition( id_target);
if(agent_position == target_position)
{
assert(invariant());
return Vector3::ZERO;
}
assert(world.isAlive(m_id_agent ));
assert(world.isAlive( id_target));
double agent_speed_max = world.getShipSpeedMax(m_id_agent);
assert(agent_speed_max >= 0.0);
Vector3 target_velocity = world.getVelocity(id_target);
Vector3 aim_direction = getAimDirection(agent_position, shot_speed, target_position, target_velocity);
assert(invariant());
return aim_direction * agent_speed_max;
}
Vector3 SteeringBehaviour :: patrolSphere (const WorldInterface& world,
const Vector3& sphere_center,
double patrol_radius,
double patrol_radius_tolerance)
{
assert(patrol_radius >= 0.0);
assert(patrol_radius_tolerance >= 0.0);
bool is_new_position_needed = false;
if(m_steering_behaviour != PATROL_SPHERE ||
m_sphere_center != sphere_center ||
m_desired_distance != patrol_radius ||
m_desired_distance_tolerance != patrol_radius_tolerance)
{
m_steering_behaviour = PATROL_SPHERE;
m_sphere_center = sphere_center;
m_desired_distance = patrol_radius;
m_desired_distance_tolerance = patrol_radius_tolerance;
is_new_position_needed = true;
}
if(!world.isAlive(m_id_agent))
{
// the explore position doesn't matter at this point
assert(invariant());
return Vector3::ZERO;
}
Vector3 agent_position = world.getPosition(m_id_agent);
if(isNearEnoughPatrolSpherePoint(agent_position) ||
is_new_position_needed)
{
m_explore_position = calculatePatrolSpherePosition(agent_position);
}
double agent_speed_max = world.getShipSpeedMax(m_id_agent);
assert(agent_speed_max >= 0.0);
if(DEBUGGING_PATROL_SPHERE)
{
cout << "Explore:" << endl;
cout << "\tAgent position: " << agent_position << endl;
cout << "\tSphere position: " << m_sphere_center << endl;
cout << "\tExplore position: " << m_explore_position << endl;
}
double distance_from_sphere = agent_position.getDistance(m_sphere_center);
double weight_parallel = 1.0;
if(m_desired_distance_tolerance > 0.0)
{
double distance_outside_optimum = distance_from_sphere - m_desired_distance;
weight_parallel = distance_outside_optimum / m_desired_distance_tolerance;
if(weight_parallel > 1.0)
weight_parallel = 1.0;
if(weight_parallel < -1.0)
weight_parallel = -1.0;
if(DEBUGGING_PATROL_SPHERE)
{
cout << "\tSphere distance: " << distance_from_sphere << endl;
cout << "\tDesired distance: " << m_desired_distance << endl;
cout << "\tTolerance: " << m_desired_distance_tolerance << endl;
cout << "\tweight_parallel: " << weight_parallel << endl;
}
if(weight_parallel >= 0.0)
weight_parallel = weight_parallel * weight_parallel;
else
weight_parallel = -(weight_parallel * weight_parallel);
if(DEBUGGING_PATROL_SPHERE)
cout << "\t => " << weight_parallel << endl;
assert(weight_parallel <= 1.0);
assert(weight_parallel >= -1.0);
}
assert(weight_parallel <= 1.0);
assert(weight_parallel >= -1.0);
double weight_perpendicular = 1.0 - fabs(weight_parallel);
assert(weight_perpendicular <= 1.0);
assert(weight_perpendicular >= -1.0);
if(DEBUGGING_PATROL_SPHERE)
cout << "\tweight_perpendicular: " << weight_perpendicular << endl;
Vector3 to_sphere = m_sphere_center - agent_position;
Vector3 to_destination = m_explore_position - agent_position;
Vector3 parallel_to_normal = to_destination.getProjection(to_sphere);
Vector3 perpendicular_to_normal = to_destination - parallel_to_normal;
Vector3 desired_vector = parallel_to_normal * weight_parallel +
perpendicular_to_normal * weight_perpendicular;
assert(invariant());
return desired_vector.getCopyWithNormSafe(agent_speed_max);
}
// avoid only when going to collide
Vector3 SteeringBehaviour :: avoid (const WorldInterface& world,
const Vector3& original_velocity,
const Vector3& sphere_center,
double sphere_radius,
double clearance,
double avoid_distance) const
{
assert(sphere_radius >= 0.0);
assert(clearance > 0.0);
assert(clearance <= avoid_distance);
if(!world.isAlive(m_id_agent) ||
original_velocity.isZero())
{
assert(invariant());
return Vector3::ZERO;
}
Vector3 agent_position = world.getPosition(m_id_agent);
double agent_radius = world.getRadius(m_id_agent);
double desired_speed = world.getShipSpeedMax(m_id_agent);
Vector3 relative_position = sphere_center - agent_position;
double radius_sum = sphere_radius + agent_radius;
if(relative_position.isNormGreaterThan(radius_sum + avoid_distance))
{
if(DEBUGGING_AVOID)
cout << "Avoid: Outside avoid distance" << endl;
assert(invariant());
return original_velocity.getTruncated(desired_speed); // too far away to worry about
}
Vector3 agent_forward = world.getForward(m_id_agent);
if(relative_position.dotProduct(agent_forward) < 0.0)
{
// past center of object; no cylinder
if(DEBUGGING_AVOID)
cout << "Avoid: Departing from object" << endl;
if(relative_position.isNormLessThan(radius_sum + clearance))
{
// we are too close, so flee and slow down
double distance_fraction = (relative_position.getNorm() - radius_sum) / clearance;
if(DEBUGGING_AVOID)
cout << "\tInside panic distance: fraction = " << distance_fraction << endl;
if(distance_fraction < 0.0)
distance_fraction = 0.0;
Vector3 interpolated = original_velocity.getNormalized() * distance_fraction +
-relative_position.getNormalized() * (1.0 - distance_fraction);
if(distance_fraction > AVOID_SPEED_FACTOR_MIN)
desired_speed *= distance_fraction;
else
desired_speed *= AVOID_SPEED_FACTOR_MIN;
if(original_velocity.isNormLessThan(desired_speed))
desired_speed = original_velocity.getNorm();
assert(invariant());
return interpolated.getCopyWithNorm(desired_speed);
}
else
{
if(DEBUGGING_AVOID)
cout << "\tPast object" << endl;
assert(invariant());
return original_velocity.getTruncated(desired_speed); // far enough past object
}
}
else
{
// have not reached center of object; check against cylinder
if(DEBUGGING_AVOID)
cout << "Avoid: Approaching object" << endl;
double distance_from_cylinder_center = relative_position.getAntiProjection(agent_forward).getNorm();
double clearance_fraction = (distance_from_cylinder_center - radius_sum) / clearance;
if(DEBUGGING_AVOID)
{
cout << "\tTo sphere: " << relative_position << endl;
cout << "\tDistance_from_cylinder_center: " << distance_from_cylinder_center << endl;
cout << "\tRadius_sum: " << radius_sum << endl;
cout << "\tClearance: " << clearance << endl;
cout << "\tFraction: " << clearance_fraction << endl;
}
if(clearance_fraction < 0.0)
{
clearance_fraction = 0.0;
if(DEBUGGING_AVOID)
cout << "\tLined up at sphere" << endl;
}
if(clearance_fraction > 1.0)
{
if(DEBUGGING_AVOID)
cout << "\tOutside cylinder" << endl;
assert(invariant());
return original_velocity; // outside of danger cylinder
}
if(DEBUGGING_AVOID)
cout << "\tModified fraction: " << clearance_fraction << endl;
assert(!original_velocity.isZero());
assert(!agent_forward.isZero());
Vector3 sideways_vector = -relative_position.getAntiProjection(agent_forward);
while(sideways_vector.isNormLessThan(AVOID_SIDEWAYS_NORM_MIN))
{
// we have almost no sideways, so use a random value
sideways_vector = Vector3::getRandomUnitVector().getAntiProjection(agent_forward);
// keep trying until we get a good one
}
assert(!original_velocity.isZero());
assert(!sideways_vector.isZero());
assert(sideways_vector.isOrthogonal(agent_forward));
if(DEBUGGING_AVOID)
cout << "\tSideways: " << sideways_vector << endl;
Vector3 interpolated = original_velocity.getNormalized() * clearance_fraction +
sideways_vector .getNormalized() * (1.0 - clearance_fraction);
if(original_velocity.isNormLessThan(desired_speed))
desired_speed = original_velocity.getNorm();
if(DEBUGGING_AVOID)
cout << "\tDodging out of cylinder: " << interpolated.getCopyWithNorm(desired_speed) << endl;
assert(invariant());
return interpolated.getCopyWithNorm(desired_speed);
}
}
