// A Selector may be contaminated with other nodes (Condition) or IParentBeahviourTreeNodes over which
// it's behaviour as a selector is applied. The assumption here is that any item in it's child list
// should have selector behaviour applied unless the first one is a condition Action.
public BehaviourTreeStatus Tick(TimeData time)
{
int skipOne = 0;
// check if this is a conditional action
IBehaviourTreeNode firstNode = children[0];
if (firstNode is ConditionNode)
{
ConditionNode firstChild = (ConditionNode)firstNode;
var status = firstChild.Tick(time);
if (status != BehaviourTreeStatus.Success)
{
return(BehaviourTreeStatus.Success);
}
++skipOne;
}
List <IBehaviourTreeNode> remainingChildren = children.Skip(skipOne).ToList <IBehaviourTreeNode>();
if (isRandom)
{
remainingChildren = Randomize(remainingChildren);
}
foreach (var child in remainingChildren)
{
var childStatus = child.Tick(time);
if (childStatus != BehaviourTreeStatus.Failure)
{
return(childStatus);
}
}
return(BehaviourTreeStatus.Failure);
}
/// <summary>
/// Like an action node... but the function can return true/false and is mapped to success/failure.
/// </summary>
public BehaviourTreeBuilder Condition(string name, Func <TimeData, bool> fn)
{
if (parentNodeStack.Count <= 0)
{
throw new ApplicationException("Can't create an unnested ActionNode, it must be a leaf node.");
}
var conditionNode = new ConditionNode(name, fn);
parentNodeStack.Peek().AddChild(conditionNode);
return(this);
}
// A Selector may be contaminated with other nodes (Condition) or IParentBeahviourTreeNodes over which
// it's behaviour as a selector is applied. The assumption here is that any item in it's child list
// should have selector behaviour applied unless the first one is a condition Action.
public IEnumerator <BehaviourTreeStatus> Tick(TimeData time)
{
int skipOne = 0;
// check if this is a conditional action
IBehaviourTreeNode firstNode = children[0];
if (firstNode is ConditionNode)
{
ConditionNode firstChild = (ConditionNode)firstNode;
var status = firstChild.Tick(time);
status.MoveNext();
if (status.Current != BehaviourTreeStatus.Success)
{
// Return Failure and Exit the Node
currentStatus = BehaviourTreeStatus.Failure;
yield return(currentStatus);
yield break;
}
else
{
++skipOne;
}
}
List <IBehaviourTreeNode> remainingChildren = children.Skip(skipOne).ToList <IBehaviourTreeNode>();
if (isRandom)
{
remainingChildren = Randomize(remainingChildren);
}
foreach (var child in remainingChildren)
{
var childStatus = child.Tick(time);
childStatus.MoveNext();
currentStatus = childStatus.Current;
if (isRunning())
{
// keep looping until we exit running mode or we
// run out of enum values.
yield return(currentStatus);
while (childStatus.MoveNext())
{
currentStatus = childStatus.Current;
if (!isRunning())
{
break;
}
}
}
// On exit above, status should be success or fail
// if success, then exit selector
if (isSuccess())
{
yield return(currentStatus);
yield break;
}
}
yield return(currentStatus);
}