private bool StartRequest(IPathRequest request)
{
Ensure.ArgumentNotNull(request, "request");
if (!request.isValid)
{
throw new ArgumentException("The request is invalid.", "request");
}
if (_currentRequest != null)
{
throw new InvalidOperationException("A new request cannot be started while another request is being processed.");
}
_currentRequest = request;
var start = request.fromGrid.GetCell(request.from) as IPathNode;
_goal = request.toGrid.GetCell(request.to) as IPathNode;
if (start == null)
{
CompleteRequest(PathingStatus.StartOutsideGrid);
return false;
}
if (_goal == null)
{
CompleteRequest(PathingStatus.EndOutsideGrid);
return false;
}
if (!_goal.isWalkable(_currentRequest.requester.attributes))
{
CompleteRequest(PathingStatus.DestinationBlocked);
return false;
}
OnStart(start);
return true;
}