CollisionManager.cpp

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#include "CollisionManager.h"
 
 
void CollisionManager::AddCollisionType(const CollisionType type1, const CollisionType type2, OnCollision callback)
{
    Collision c;
    c.Type1 = (type1 < type2) ? type1 : type2;
    c.Type2 = (type1 > type2) ? type1 : type2;
    c.Callback = callback;
 
    m_collisions.push_back(c);
}
 
void CollisionManager::CheckCollision(GameObject *pGameObject1, GameObject *pGameObject2)
{
    CollisionType t1 = pGameObject1->GetCollisionType();
    CollisionType t2 = pGameObject2->GetCollisionType();
 
    if (t1 == t2 || t1 == CollisionType::None || t2 == CollisionType::None) return;
 
    bool swapped = false;
    if (t1 > t2)
    {
        std::swap(t1, t2);
        swapped = true;
    }
 
    m_nonCollisionIt = m_nonCollisions.begin();
    for (; m_nonCollisionIt != m_nonCollisions.end(); m_nonCollisionIt++)
    {
        NonCollision nc = *m_nonCollisionIt;
        if ((nc.Type1 == t1 && nc.Type2 == t2)) return;
    }
 
    m_collisionIt = m_collisions.begin();
    for (; m_collisionIt != m_collisions.end(); m_collisionIt++)
    {
        Collision c = *m_collisionIt;
        if ((c.Type1 == t1 && c.Type2 == t2))
        {
            Vector2 difference = pGameObject1->GetPosition() - pGameObject2->GetPosition();
 
            float radiiSum = pGameObject1->GetCollisionRadius() + pGameObject2->GetCollisionRadius();
            float radiiSumSquared = radiiSum * radiiSum;
 
            if (difference.LengthSquared() <= radiiSumSquared)
            {
                if (!swapped) c.Callback(pGameObject1, pGameObject2);
                else c.Callback(pGameObject2, pGameObject1);
            }
            return;
        }
    }
 
    AddNonCollisionType(t1, t2);
}
 
void CollisionManager::AddNonCollisionType(const CollisionType type1, const CollisionType type2)
{
    NonCollision nc;
    nc.Type1 = (type1 < type2) ? type1 : type2;
    nc.Type2 = (type1 > type2) ? type1 : type2;
    m_nonCollisions.push_back(nc);
}