/// <summary>
/// Handles portalling.
/// </summary>
/// <param name="unitData">This unit's UnitFacade.</param>
/// <param name="group">This unit's current/old group.</param>
/// <param name="vectorField">The vector field.</param>
/// <param name="pathPortalIndex">Index of the portal in the current path.</param>
/// <param name="grid">The grid.</param>
private void HandlePortal(IUnitFacade unitData, DefaultSteeringTransientUnitGroup group, IVectorField vectorField, int pathPortalIndex, IGrid grid)
{
var portal = _currentPath[pathPortalIndex] as IPortalNode;
if (portal == null)
{
// if the path node that was reported as a portal turns out not to be - return
return;
}
if (object.ReferenceEquals(unitData, group.modelUnit))
{
// don't ever let model unit jump portal
return;
}
int groupCount = group.count;
var to = _currentPath[pathPortalIndex + 1];
// we consider a portal a "far portal" when the distance between it and its partner is more than the diagonal cell size
// 'far portal' means that it is NOT considered a grid stitching connector portal
// Requires that grid stitching portals are always placed adjacent to each other
float portalNewGroupThreshold = (grid.cellSize * Consts.SquareRootTwo) + 0.1f;
bool isFarPortal = (portal.position - portal.partner.position).sqrMagnitude > (portalNewGroupThreshold * portalNewGroupThreshold);
if (isFarPortal)
{
// if it is a far portal, we need to make or use the next group
if (group.nextGroup == null)
{
// new group does not exist yet, so create it and tell the old group about it
var groupStrat = GroupingManager.GetGroupingStrategy <IUnitFacade>();
if (groupStrat == null)
{
Debug.Log("No Grouping Strategy has been registered for IUnitFacade");
return;
}
var newGroup = groupStrat.CreateGroup(groupCount) as DefaultSteeringTransientUnitGroup;
if (newGroup == null)
{
return;
}
group.nextGroup = newGroup;
_nextGroup = newGroup;
}
else
{
// new group exists, so just use it
_nextGroup = group.nextGroup;
}
// make sure to remove the unit from the old group
group.Remove(unitData);
}
_isPortalling = true;
// actually execute the portal
portal.Execute(
unitData.transform,
to,
() =>
{
_isPortalling = false;
if (isFarPortal)
{
// if it is a far portal, we are supposed to join up with the new group
_nextGroup.Add(unitData);
unitData.transientGroup = _nextGroup;
if (_nextGroup.count == 1)
{
// let the first unit in the new group be responsible for setting the new group up
if (vectorField.destination != null)
{
// the new group's path starts on the other side of the portal...
int pathCount = _currentPath.count;
var newPath = new Path(pathCount - (pathPortalIndex + 2));
for (int i = pathCount - 1; i >= pathPortalIndex + 2; i--)
{
newPath.Push(_currentPath[i]);
}
// the first member that joins the new group tells the new group to move along the path of the old group
Vector3 destination = vectorField.destination.position;
if ((to.position - destination).sqrMagnitude > 1f)
{
// check though that the destination is not the same as the starting position
_nextGroup.MoveAlong(newPath);
}
// pass along old group's waypoints to new group
if (group.currentWaypoints.count > 0)
{
_nextGroup.SetWaypoints(group.currentWaypoints);
}
// pass along old group's formation to the new group
if (group.currentFormation != null)
{
_nextGroup.TransferFormation(group.currentFormation, groupCount, group);
}
}
}
}
});
}
