/// <summary>
/// moves the entity taking collisions into account
/// </summary>
/// <returns><c>true</c>, if move actor was newed, <c>false</c> otherwise.</returns>
/// <param name="motion">Motion.</param>
/// <param name="collisionResult">Collision result.</param>
public bool move(Vector2 motion, out CollisionResult collisionResult)
{
collisionResult = new CollisionResult();
// no collider? just move and forget about it
if (entity.getComponent <Collider>() == null || _triggerHelper == null)
{
entity.transform.position += motion;
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))
{
// hit. back off our motion
motion -= collisionResult.minimumTranslationVector;
}
}
}
ListPool <Collider> .free(colliders);
// 2. move entity to its new position if we have a collision else move the full amount. motion is updated when a collision occurs
entity.transform.position += motion;
// 3. do an overlap check of all Colliders that are triggers with all broadphase colliders, triggers or not.
// Any overlaps result in trigger events.
_triggerHelper.update();
return(collisionResult.collider != null);
}
/// <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 Vector2 motion, out CollisionResult collisionResult)
{
collisionResult = new CollisionResult();
// no collider? just move and forget about it
if (entity.getComponent <Collider>() == null || _triggerHelper == null)
{
entity.transform.position += motion;
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))
{
// hit. back off our motion
motion -= collisionResult.minimumTranslationVector;
}
}
}
ListPool <Collider> .free(colliders);
return(collisionResult.collider != null);
}
/// <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);
}
_activeTriggerIntersections.Add(pair);
}
// overlaps
}
// end foreach
}
ListPool <Collider> .free(colliders);
checkForExitedColliders();
}