/// <summary>
/// Move the given actor by the given movement, colliding and adjusting
/// as necessary.
/// </summary>
/// <param name="actor">The actor who is moving.</param>
/// <param name="movement">The desired movement vector for this update.</param>
/// <returns>The movement vector after considering all collisions.</returns>
private Vector2 MoveAndCollide(Actor actor, Vector2 movement)
{
if (actor == null)
{
throw new ArgumentNullException("actor");
}
// make sure we care about where this actor goes
if (actor.Dead || (actor.Collidable == false))
{
return(movement);
}
// make sure the movement is significant
if (movement.LengthSquared() <= 0f)
{
return(movement);
}
// generate the list of collisions
Collide(actor, movement);
// determine if we had any collisions
if (collisionResults.Count > 0)
{
collisionResults.Sort(CollisionResult.Compare);
foreach (CollisionResult collision in collisionResults)
{
// let the two actors touch each other, and see what happens
if (actor.Touch(collision.Actor) && collision.Actor.Touch(actor))
{
actor.CollidedThisFrame =
collision.Actor.CollidedThisFrame = true;
// they should react to the other, even if they just died
AdjustVelocities(actor, collision.Actor);
return(Vector2.Zero);
}
}
}
return(movement);
}
/// <summary>
/// Move the given actor by the given movement, colliding and adjusting
/// as necessary.
/// </summary>
/// <param name="actor">The actor who is moving.</param>
/// <param name="movement">The desired movement vector for this update.</param>
/// <returns>The movement vector after considering all collisions.</returns>
private Vector2 MoveAndCollide(Actor actor, Vector2 movement)
{
if (actor == null)
{
throw new ArgumentNullException("actor");
}
// make sure we care about where this actor goes
if (actor.Dead || (actor.Collidable == false))
{
return movement;
}
// make sure the movement is significant
if (movement.LengthSquared() <= 0f)
{
return movement;
}
// generate the list of collisions
Collide(actor, movement);
// determine if we had any collisions
if (collisionResults.Count > 0)
{
collisionResults.Sort(CollisionResult.Compare);
foreach (CollisionResult collision in collisionResults)
{
// let the two actors touch each other, and see what happens
if (actor.Touch(collision.Actor) && collision.Actor.Touch(actor))
{
actor.CollidedThisFrame =
collision.Actor.CollidedThisFrame = true;
// they should react to the other, even if they just died
AdjustVelocities(actor, collision.Actor);
return Vector2.Zero;
}
}
}
return movement;
}
