public void GetCollisions()
{
RemoveDeletedEntities();
// Sort all entities by their minimum X extent
Compatible.Sort((e1, e2) =>
e1.GetComponent <CircleColliderComponent>().MinX()
.CompareTo(
e2.GetComponent <CircleColliderComponent>().MinX()
)
);
// Reset collision info
for (int i = 0; i < Compatible.Count; i++)
{
CircleColliderComponent collider = Compatible[i].GetComponent <CircleColliderComponent>();
TransformComponent transform = Compatible[i].GetComponent <TransformComponent>();
collider.UpdatePosition(transform);
collider.ClearCollisions();
}
Collisions.Clear();
for (int i = 0; i < Compatible.Count; i++)
{
CircleColliderComponent collider = Compatible[i].GetComponent <CircleColliderComponent>();
float maxX = collider.MaxX();
for (int j = i + 1; j < Compatible.Count; j++)
{
CircleColliderComponent otherCollider = Compatible[j].GetComponent <CircleColliderComponent>();
// If the other collider has a minimum x span that is greater than our max x,
// Then we no longer need to keep checking. This collider and all other colliders after it cannot be intersecting this collider.
if (otherCollider.MinX() > maxX)
{
break;
}
if (collider.Intersects(otherCollider))
{
if (!_shouldDetectCollision(Compatible[i], Compatible[j]))
{
continue;
}
//Calculatye the collison normal
var collNormal = otherCollider.Position - collider.Position;
if (collNormal != Vector2.Zero)
{
collNormal.Normalize();
}
else
{
collNormal = Vector2.One;
}
Collisions.Add(new Collision()
{
Normal = collNormal,
E1 = Compatible[i],
E2 = Compatible[j]
});
}
}
}
}