/// <summary>
/// Used for weightlessness to determine if we are near a wall.
/// </summary>
/// <param name="broadPhaseSystem"></param>
/// <param name="transform"></param>
/// <param name="mover"></param>
/// <param name="collider"></param>
/// <returns></returns>
public static bool IsAroundCollider(SharedBroadphaseSystem broadPhaseSystem, ITransformComponent transform, IMobMoverComponent mover, IPhysBody collider)
{
var enlargedAABB = collider.GetWorldAABB().Enlarged(mover.GrabRange);
foreach (var otherCollider in broadPhaseSystem.GetCollidingEntities(transform.MapID, enlargedAABB))
{
if (otherCollider == collider)
{
continue; // Don't try to push off of yourself!
}
// Only allow pushing off of anchored things that have collision.
if (otherCollider.BodyType != BodyType.Static ||
!otherCollider.CanCollide ||
((collider.CollisionMask & otherCollider.CollisionLayer) == 0 &&
(otherCollider.CollisionMask & collider.CollisionLayer) == 0) ||
(otherCollider.Owner.TryGetComponent(out SharedPullableComponent? pullable) && pullable.BeingPulled))
{
continue;
}
return(true);
}
return(false);
}
public float CalculatePenetration(IPhysBody target, IPhysBody source)
{
var manifold = target.GetWorldAABB().Intersect(source.GetWorldAABB());
if (manifold.IsEmpty())
{
return(0.0f);
}
return(manifold.Height > manifold.Width ? manifold.Width : manifold.Height);
}
/// <summary>
/// Calculates the normal vector for two colliding bodies
/// </summary>
/// <param name="target"></param>
/// <param name="source"></param>
/// <returns></returns>
public static Vector2 CalculateNormal(IPhysBody target, IPhysBody source)
{
var manifold = target.GetWorldAABB().Intersect(source.GetWorldAABB());
if (manifold.IsEmpty())
{
return(Vector2.Zero);
}
if (manifold.Height > manifold.Width)
{
// X is the axis of seperation
var leftDist = source.GetWorldAABB().Right - target.GetWorldAABB().Left;
var rightDist = target.GetWorldAABB().Right - source.GetWorldAABB().Left;
return(new Vector2(leftDist > rightDist ? 1 : -1, 0));
}
else
{
// Y is the axis of seperation
var bottomDist = source.GetWorldAABB().Top - target.GetWorldAABB().Bottom;
var topDist = target.GetWorldAABB().Top - source.GetWorldAABB().Bottom;
return(new Vector2(0, bottomDist > topDist ? 1 : -1));
}
}
private bool TrySlip(SlipperyComponent component, IPhysBody ourBody, IPhysBody otherBody)
{
if (!component.Slippery ||
component.Owner.IsInContainer() ||
component.Slipped.Contains(otherBody.Owner.Uid) ||
!otherBody.Owner.TryGetComponent(out SharedStunnableComponent? stun))
{
return(false);
}
if (otherBody.LinearVelocity.Length < component.RequiredSlipSpeed || stun.KnockedDown)
{
return(false);
}
var percentage = otherBody.GetWorldAABB().IntersectPercentage(ourBody.GetWorldAABB());
if (percentage < component.IntersectPercentage)
{
return(false);
}
if (!EffectBlockerSystem.CanSlip(otherBody.Owner))
{
return(false);
}
otherBody.LinearVelocity *= component.LaunchForwardsMultiplier;
stun.Paralyze(5);
component.Slipped.Add(otherBody.Owner.Uid);
component.Dirty();
PlaySound(component);
return(true);
}
