/// <summary>
/// Handle ComponentCreated events.
/// </summary>
/// <param name="evt">
/// The <see cref="IEvent"/> event to handle.
/// </param>
private void OnComponentCreated(IEvent evt)
{
if (evt.EventData is MovableComponent)
{
MovableComponent movable = (MovableComponent)evt.EventData;
movable.Rigidbody = movable.gameObject.GetComponent <Rigidbody>();
movable.DesiredPosition = movable.gameObject.transform.position;
}
}
/// <summary>
/// Move the entity, that has the given movable to the desired position.
/// </summary>
/// <param name="movable">
/// The <see cref="MovableComponent"/> movable component of the entity to move.
/// </param>
/// <param name="position">
/// The <see cref="Vector3"/> position to move the entity to.
/// </param>
private void MoveMovableToPosition(MovableComponent movable, Vector3 target)
{
if (movable == null)
{
// This checks, whether the component is still considered alive by Unity.
// The check is very important, as we are accessing components from Unity
// now, instead of just C# context components. If the object is Unity-dead,
// don't do anything here.
return;
}
Transform transform = movable.gameObject.transform;
Vector3 movementVector = target - transform.position;
Collider collider = movable.gameObject.collider;
Vector3 colliderExtents = collider.bounds.extents;
float movableRange = Mathf.Max(Mathf.Max(colliderExtents.x, colliderExtents.y), colliderExtents.z) * 2.0f;
RaycastHit hit;
// Test to see, if there are any colliders in the movement direction and stop close to the hit point.
// This is done for all movables here to illustrate the shared use of characteristics (Components) by
// entities of different types (the Ball and the paddle in this case). The implementation is a hacky,
// imperformant and buggy though and it should not be used for any real game. In those cases, you may
// want to use different movement strategies for the paddle and the ball, as their requirements differ.
if (Physics.Raycast(transform.position, movementVector, out hit, movableRange + movementVector.sqrMagnitude, movable.CollisionMask))
{
// There is a collider near by, that might be in the way at the hit point.
Vector3 collisionPoint = hit.point;
// Calculate a point outside the collider to cast from, using the maximum
// extent of the collider along an axis times two, as that should definitely
// be outside the collider.
Vector3 movableCastPoint = movementVector.normalized;
movableCastPoint *= movableRange * 2.0f;
movableCastPoint += transform.position;
// Check to find a point in the movement direction, that may collide.
Ray ray = new Ray(movableCastPoint, movementVector * -1);
if (collider.Raycast(ray, out hit, Mathf.Infinity))
{
// There is a point, that would actually collide. Substract
// its position from that of the blocking collider to get the
// new center of the movable. Because the collision vector starts
// at twice the distance, the actual distance is distance * 0.5, which
// in case of using square magnitude checks needs to also be squared.
if ((collisionPoint - hit.point).sqrMagnitude < movementVector.sqrMagnitude)
{
target = collisionPoint - (hit.point - transform.position);
}
}
}
// Set the new target position using the entities transform (as opposed to
// Rigidbody.MovePosition, as it seems to behave a bit weird).
transform.position = target;
}
/// <summary>
/// Move the entity, that has the given movable to the desired position.
/// </summary>
/// <param name="movable">
/// The <see cref="MovableComponent"/> movable component of the entity to move.
/// </param>
/// <param name="position">
/// The <see cref="Vector3"/> position to move the entity to.
/// </param>
private void MoveMovableToPosition(MovableComponent movable, Vector3 target)
{
if (movable == null)
{
// This checks, whether the component is still considered alive by Unity.
// The check is very important, as we are accessing components from Unity
// now, instead of just C# context components. If the object is Unity-dead,
// don't do anything here.
return;
}
Transform transform = movable.gameObject.transform;
Vector3 movementVector = target - transform.position;
Collider collider = movable.gameObject.collider;
Vector3 colliderExtents = collider.bounds.extents;
float movableRange = Mathf.Max(Mathf.Max(colliderExtents.x, colliderExtents.y), colliderExtents.z) * 2.0f;
RaycastHit hit;
// Test to see, if there are any colliders in the movement direction and stop close to the hit point.
// This is done for all movables here to illustrate the shared use of characteristics (Components) by
// entities of different types (the Ball and the paddle in this case). The implementation is a hacky,
// imperformant and buggy though and it should not be used for any real game. In those cases, you may
// want to use different movement strategies for the paddle and the ball, as their requirements differ.
if (Physics.Raycast(transform.position, movementVector, out hit, movableRange + movementVector.sqrMagnitude, movable.CollisionMask))
{
// There is a collider near by, that might be in the way at the hit point.
Vector3 collisionPoint = hit.point;
// Calculate a point outside the collider to cast from, using the maximum
// extent of the collider along an axis times two, as that should definitely
// be outside the collider.
Vector3 movableCastPoint = movementVector.normalized;
movableCastPoint *= movableRange * 2.0f;
movableCastPoint += transform.position;
// Check to find a point in the movement direction, that may collide.
Ray ray = new Ray(movableCastPoint, movementVector * -1);
if (collider.Raycast(ray, out hit, Mathf.Infinity))
{
// There is a point, that would actually collide. Substract
// its position from that of the blocking collider to get the
// new center of the movable. Because the collision vector starts
// at twice the distance, the actual distance is distance * 0.5, which
// in case of using square magnitude checks needs to also be squared.
if ((collisionPoint - hit.point).sqrMagnitude < movementVector.sqrMagnitude)
{
target = collisionPoint - (hit.point - transform.position);
}
}
}
// Set the new target position using the entities transform (as opposed to
// Rigidbody.MovePosition, as it seems to behave a bit weird).
transform.position = target;
}
