void Projectile::Update(float elapsedTime)
{
// Test si les conditions de fin du projectile sont vraies
if (m_timeToLive <= 0 || !m_shot || elapsedTime == 0)
return;
// Test si atteint la cible
if( abs(m_destination.x - m_pos.x) < m_collisionRadius.x
&& abs(m_destination.y - m_pos.y) < m_collisionRadius.y
&& abs(m_destination.z - m_pos.z) < m_collisionRadius.z) {
Hit();
return;
}
Vector3f speed = m_rot * m_speed;
speed = speed * m_speed.Lenght();
// Met a jour la valeur de la vitesse en
// fonction de l'acceleration et du temps
m_speed += m_acceleration * elapsedTime;
m_timeToLive -= elapsedTime;
// distance entre le projectile et sa destination
// chemin le plus court
Vector3f distance;
distance.x = m_pos.x - m_destination.x;
distance.y = m_pos.y - m_destination.y;
distance.z = m_pos.z - m_destination.z;
// calculer l'angle entre les 2 vecteurs
// fix imprecision float
float n = distance.Dot(speed) / (distance.Lenght() * speed.Lenght());
if (n > 1)
n = 1;
else if (n < -1)
n = -1;
float angleA = acos(n);
std::cout << angleA << std::endl;
Vector3f axis = distance.Cross(speed);
axis.Normalize();
// rotation autour de laxe
float rotation;
if (abs(angleA) >= m_maxRot && abs(angleA) < PII - m_maxRot) {
rotation = (angleA > 0) ? -m_maxRot : m_maxRot;
rotation *= elapsedTime;
}
else
rotation = angleA - PII;
Quaternion q;
q.FromAxis(rotation, axis);
q.Normalise();
m_rot = q * m_rot;
m_rot.Normalise();
// calcul la nouvelle position
m_pos += speed * elapsedTime;
}
/**
* Called when the AI doesn't have a target. In this case, it should just lock
* the cursor to the middle of the screen.
*/
void ShootingAI::aimCursorAtMiddle(double dt) {
Vector3D wouldHit;
double ang = 0;
Point3D aim = lastShotPos;
// This target position is just in front of the ship.
Point3D targetPos = ship->shotOrigin;
/* Move the target position a bit in the forward direction to make sure
* that it's in front of the ship, not behind it.
*/
ship->forward->movePoint(targetPos);
Vector3D targetDir = (targetPos - ship->shotOrigin).getNormalized();
// This section of code does angle interpolation.
// Find the angle between our vector and where we want to be.
ang = acos(aim * targetDir);
// Get our axis of rotation.
wouldHit = (aim ^ targetDir);
wouldHit.normalize();
if (ang > (gunRotSpeed * dt)) {
Quaternion q;
q.FromAxis(wouldHit, gunRotSpeed * dt);
aim = q * aim;
// Normalize the vector.
aim.normalize();
}
else {
aim = targetDir;
}
ship->updateShotDirection(aim);
lastShotPos = aim;
}
/** Aims at an object.
*
* This function should be called multiple frames consecutively in order
* to actually aim at the object. The gun barrel has a rotation time,
* and this function takes care of moving the virtual barrel to where it
* needs to be. This will take care of predicting where the target will
* be based on its current velocity.
*
* @param dt time difference since last frame, for gun turning.
* @return Whether or not the ship is ready to fire.
*/
bool ShootingAI::aimAt(double dt, Object3D* target) {
Vector3D wouldHit;
Vector3D randomVariation;
double ang = 0;
//------------------------------
// Add a random variation to the aim.
// randomVariation is between <-1, -1, -1> and <1, 1, 1>
randomVariation.randomMagnitude();
/* maxDifficulty - difficulty ensures that high difficulty means very
* little is added onto the randomVariation. Low difficulty means that
* a large number is added onto the randomVariation.
* The accuracy scales exponentially. Even a max difficulty AI will have
* some small randomIAVariationAmount per weapon.
*/
//randomVariation.scalarMultiplyUpdate(chosenWeapon->randomAIVariationAmount + (maxDifficulty - difficulty)/((float)difficulty / 2));
randomVariation.scalarMultiplyUpdate(chosenWeapon->randomAIVariationAmount + ((maxDifficulty - difficulty)*(maxDifficulty - difficulty)/15));
//aim.addUpdate(randomVariation);
//-----------------------------
Point3D aim = lastShotPos;
Point3D targetPos = chosenWeapon->project(target, randomVariation);
Vector3D targetDir = (targetPos - ship->shotOrigin).getNormalized();
// This section of code does angle interpolation.
// Find the angle between our vector and where we want to be.
ang = acos(aim * targetDir);
// Get our axis of rotation.
wouldHit = (aim ^ targetDir);
wouldHit.normalize();
if (ang > (gunRotSpeed * dt)) {
Quaternion q;
q.FromAxis(wouldHit, gunRotSpeed * dt);
aim = q * aim;
// Normalize the vector.
aim.normalize();
}
else {
aim = targetDir;
}
// The aiming should be clamped within a radius
//double forwardDotAim = aim.dot(*ship->forward);
double forwardDotAim = targetDir.dot(*ship->forward);
/*
double upDotAim = aim.dot(*ship->up);
double rightDotAim = aim.dot(*ship->right);
*/
// (Root 2)/2 radians
const double minForwardAimAmount = 0.707;
ship->updateShotDirection(aim);
lastShotPos = aim;
bool shouldFire = !chosenWeapon->isOverheated() &&
chosenWeapon->shouldFire(&targetPos, &aim);
/* If the cursor is going outside of the allowable range, choose a new target.
* Make sure we don't fire.
*/
if(forwardDotAim < minForwardAimAmount) {
needToChooseTarget = true;
shouldFire = false;
}
return shouldFire;
}
void Npc::Move(const Vector3f& destination, float elapsedTime)
{
if (elapsedTime == 0)
return;
// Gravité
float distanceY = (m_speedGravity * elapsedTime) + (GRAVITY * elapsedTime * elapsedTime / 2.0f);
if (!CheckCollision(Vector3f(m_pos.x, m_pos.y - distanceY, m_pos.z)))
{
m_speedGravity -= GRAVITY * elapsedTime;
}
else
{
m_speedGravity = 0;
distanceY = 0;
}
// Test si atteint la destination
if( abs(destination.x - m_pos.x) < 1
&& abs(destination.y - m_pos.y) < 1
&& abs(destination.z - m_pos.z) < 1) {
}
else {
Vector3f deplacement;
deplacement = m_rot * m_speed * elapsedTime;
// chemin le plus court
Vector3f distance;
distance.x = m_pos.x - destination.x;
distance.y = m_pos.y - destination.y;
distance.z = m_pos.z - destination.z;
// calculer l'angle entre les 2 vecteurs
// fix imprecision float
float n = distance.Dot(deplacement) / (distance.Lenght() * deplacement.Lenght());
if (n > 1)
n = 1;
else if (n < -1)
n = -1;
float angleA = acos(n);
Vector3f axis = distance.Cross(deplacement);
axis.Normalize();
// rotation autour de laxe
float rotation;
if (abs(angleA) >= m_maxRot && abs(angleA) < PII - m_maxRot)
rotation = (angleA > 0) ? -m_maxRot : m_maxRot;
else
rotation = angleA - PII;
Quaternion q;
q.FromAxis(rotation, axis);
q.Normalise();
m_rot = q * m_rot;
m_rot.Normalise();
// Check collisions
Vector3f curPos = m_pos;
Vector3f newPos;
newPos.x = curPos.x + deplacement.x;
newPos.y = curPos.y;
newPos.z = curPos.z;
if(!CheckCollision(newPos + Vector3f(0,1,0)))
m_pos.x += deplacement.x;
newPos.x = curPos.x;
newPos.y = curPos.y + deplacement.y;
newPos.z = curPos.z;
if(!CheckCollision(newPos + Vector3f(0,1,0)))
m_pos.y += deplacement.y;
newPos.x = curPos.x;
newPos.y = curPos.y;
newPos.z = curPos.z + deplacement.z;
if(!CheckCollision(newPos + Vector3f(0,1,0)))
m_pos.z += deplacement.z;
}
if (!m_flying)
m_pos.y += distanceY;
}