/// <summary>
/// caculates the movement modifying the motion vector to take into account any collisions that will
/// occur when moving
/// </summary>
/// <returns><c>true</c>, if movement was calculated, <c>false</c> otherwise.</returns>
/// <param name="motion">Motion.</param>
/// <param name="collisionResult">Collision result.</param>
public bool CalculateMovement(ref System.Numerics.Vector2 motion, out CollisionResult collisionResult)
{
collisionResult = new CollisionResult();
// no collider? just move and forget about it
if (Entity.GetComponent <Collider>() == null || _triggerHelper == null)
{
return(false);
}
// 1. move all non-trigger Colliders and get closest collision
var colliders = Entity.GetComponents <Collider>();
for (var i = 0; i < colliders.Count; i++)
{
var collider = colliders[i];
// skip triggers for now. we will revisit them after we move.
if (collider.IsTrigger)
{
continue;
}
// fetch anything that we might collide with at our new position
var bounds = collider.Bounds;
bounds.X += motion.X;
bounds.Y += motion.Y;
var neighbors =
Physics.BoxcastBroadphaseExcludingSelf(collider, ref bounds, collider.CollidesWithLayers);
foreach (var neighbor in neighbors)
{
// skip triggers for now. we will revisit them after we move.
if (neighbor.IsTrigger)
{
continue;
}
if (collider.CollidesWith(neighbor, motion, out CollisionResult _InternalcollisionResult))
{
// hit. back off our motion
motion -= _InternalcollisionResult.MinimumTranslationVector;
// If we hit multiple objects, only take on the first for simplicity sake.
if (_InternalcollisionResult.Collider != null)
{
collisionResult = _InternalcollisionResult;
}
}
}
}
ListPool <Collider> .Free(colliders);
return(collisionResult.Collider != null);
}
/// <summary>
/// Calculates the movement modifying the motion vector to take into account any collisions that will
/// occur when moving. This version is modified to output through a given collection to show every
/// collision that occured.
/// </summary>
/// <returns>The amount of collisions that occured.</returns>
/// <param name="motion">Motion.</param>
/// <param name="collisionResult">Collision result.</param>
public int AdvancedCalculateMovement(ref System.Numerics.Vector2 motion, ICollection <CollisionResult> collisionResults)
{
int Collisions = 0;
// no collider? just move and forget about it
if (Entity.GetComponent <Collider>() == null || _triggerHelper == null)
{
return(Collisions);
}
// 1. move all non-trigger Colliders and get closest collision
var colliders = Entity.GetComponents <Collider>();
for (var i = 0; i < colliders.Count; i++)
{
var collider = colliders[i];
// skip triggers for now. we will revisit them after we move.
if (collider.IsTrigger)
{
continue;
}
// fetch anything that we might collide with at our new position
var bounds = collider.Bounds;
bounds.X += motion.X;
bounds.Y += motion.Y;
var neighbors =
Physics.BoxcastBroadphaseExcludingSelf(collider, ref bounds, collider.CollidesWithLayers);
foreach (var neighbor in neighbors)
{
// skip triggers for now. we will revisit them after we move.
if (neighbor.IsTrigger)
{
continue;
}
if (collider.CollidesWith(neighbor, motion, out CollisionResult _InternalcollisionResult))
{
// hit. back off our motion
motion -= _InternalcollisionResult.MinimumTranslationVector;
collisionResults.Add(_InternalcollisionResult);
Collisions++;
}
}
}
ListPool <Collider> .Free(colliders);
return(Collisions);
}
/// <summary>
/// update should be called AFTER Entity is moved. It will take care of any ITriggerListeners that the Collider overlaps.
/// </summary>
public void Update()
{
// 3. do an overlap check of all entity.colliders that are triggers with all broadphase colliders, triggers or not.
// Any overlaps result in trigger events.
var colliders = _entity.GetComponents <Collider>();
for (var i = 0; i < colliders.Count; i++)
{
var collider = colliders[i];
// fetch anything that we might collide with us at our new position
var neighbors = Physics.BoxcastBroadphase(collider.Bounds, collider.CollidesWithLayers);
foreach (var neighbor in neighbors)
{
// we need at least one of the colliders to be a trigger
if (!collider.IsTrigger && !neighbor.IsTrigger)
{
continue;
}
if (collider.Overlaps(neighbor))
{
var pair = new Pair <Collider>(collider, neighbor);
// if we already have this pair in one of our sets (the previous or current trigger intersections) dont call the enter event
var shouldReportTriggerEvent = !_activeTriggerIntersections.Contains(pair) &&
!_previousTriggerIntersections.Contains(pair);
if (shouldReportTriggerEvent)
{
NotifyTriggerListeners(pair, true);
_previousColliders.Add(pair);
}
_activeTriggerIntersections.Add(pair);
CheckForStayColliders();
} // overlaps
} // end foreach
}
ListPool <Collider> .Free(colliders);
CheckForExitedColliders();
}