detected collision, what now? [closed] - c++

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i'm checking collision between the player and every other object and it works, but what do i do now.
this is what i do now, but when the player hits something from below it teleports on top of the hit object.
do i say: teleport on top if fell onto object, set max y velocity to 0 when hit from below and max x velocity for the sides?
is that the way to do it?
but this wouldnt work with circle colliders, so how do i get my objects to stop normally on hit?
for (GameObject &g : gameObjects)
{
if (BoxCollision(player, &g))
{
player->velocity.y = 0;
// set player feet location to the top of hit object
player->transform.pos.y = g.transform.pos.y - player->sprite.height * player->transform.size.y;
player->canJump = true;
}
}
collision check:
bool BoxCollision(GameObject* g1, GameObject* g2)
{
if (g1 != g2)
{
bool left = 0, right = 0, top = 0, bottom = 0;
left = g1->transform.pos.x < g2->transform.pos.x + g2->sprite.width * g2->transform.size.x ? true : false;
right = g1->transform.pos.x + g1->sprite.width * g1->transform.size.x >= g2->transform.pos.x ? true : false;
bottom = g1->transform.pos.y + g1->sprite.height * g1->transform.size.y > g2->transform.pos.y ? true : false;
top = g1->transform.pos.y < g2->transform.pos.y + g2->sprite.height * g2->transform.size.y ? true : false;
return left && right && bottom && top ? true : false;
}
else return false;
}

Answer 1

When you detect a collision, it is because the bounding volumes of two objects O1 and O2 intersect after a time step of your engine. In other words, your object O1 started at position x in the previous timestep, and now at x+v*dt the two objects intersect. (where v=velocity and dt is your timestep)
The first course of business is to find a dt' (<dt) where objects O1 and O2 just touch. Once you have that, the decision is yours what to do:
You can set v=0 after the collision to have object O1 stop dead;
You can invert v (after reflection along the bounding box) to have O1 bounce away
You can transfer some velocity to O2 and calculate motion for the remainder of the timestep
You can destroy O2 and have O1 continue along its path.