void ProjectileCollideSystem::update()
{
for(int subID = 0; subID < subscribedEntities[0].size(); subID++)
{
//Get projectile component
Entity * projectileEnt = entities[subscribedEntities[0][subID]];
ColliderComponent* projectileCollideComp = static_cast<ColliderComponent*>(projectileEnt->getComponent(ColliderComponent::getStaticID()));
WorldComponent * projectileWorldComp = static_cast<WorldComponent*>(projectileEnt->getComponent(WorldComponent::getStaticID()));
PhysicsComponent* projectilePhysicsComp = static_cast<PhysicsComponent*>(projectileEnt->getComponent(PhysicsComponent::getStaticID()));
//Check projectile for collisions
for(int i = 0; i < projectileCollideComp->collisionData.size(); i++)
{
std::shared_ptr<CollisionPair> collision = projectileCollideComp->collisionData[i];
int projectilePairID = collision->getCollisionPairID(subscribedEntities[0][subID]);//Projectile's CollisionPairID
int collidingPairID = collision->getOppositePairID(projectilePairID);//The Colliding Ent's CollisionPairID
Entity * collidingEnt = entities[collision->getCollisionEntityID(collidingPairID)]; //The Colliding Entity
//Check the type of the collided entity and perform action
if(collidingEnt->hasComponent(TerrainComponent::getStaticID()))
{
deleteEntity(projectileEnt->entityID);
}
if(collidingEnt->hasComponent(PhysicsComponent::getStaticID()) && !collidingEnt->hasComponent(PlayerComponent::getStaticID()))
{
glm::vec2 col = collision->getMinimumTranslation(projectilePairID);
PhysicsComponent* physicsComp = static_cast<PhysicsComponent*>(collidingEnt->getComponent(PhysicsComponent::getStaticID()));
//Should 1. Be conserving energy
//Should 2. Be making sure the velocity is transfered correctly
//http://gafferongames.com/virtual-go/collision-response-and-coulomb-friction/
float j = -(1+physicsComp->coefficientRestitution)*glm::dot(projectilePhysicsComp->velocity*projectilePhysicsComp->mass,glm::normalize(col)); //projectiles impulse
float impulseMag = glm::max(j, 0.0f);
//Logger()<<impulseMag<<std::endl;
physicsComp->impulse(impulseMag*glm::normalize(-col));
projectilePhysicsComp->impulse(impulseMag*glm::normalize(col));
}
}
}
}
