iBTNode Struct Reference

This is a node of a behaviour tree. More...

#include <tools/behaviourtree.h>

Inheritance diagram for iBTNode:

List of all members.

Public Member Functions
virtual bool	AddChild (iBTNode *child)=0
	Add a child node to this node.
virtual bool	Execute (const celParams &params)=0
	Execute this node.

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Detailed Description

This is a node of a behaviour tree.

A behaviour tree allows to define the behaviour of an entity by combining behaviour nodes into a tree.

There are different type of nodes. The main leaf nodes of the tree are iBTAction nodes that fire actions (eg by sending a message to an entity or a property class). Non-action nodes are used to select the actions that will be executed.

Here is the list of different non-action nodes:

• "cel.behaviourtree": Default behaviour for a root node. It executes the tree regularly.
• "cel.selectors.default": The default selector. It executes its children in order until one succeeds.
• "cel.selectors.random": A random selector. It executes its children in a random order until one succeeds.
• "cel.selectors.sequential": A sequential selector. It executes its children in order until one fails or all have succeeded. Often refered in behaviour tree literature as a sequence.
• iTriggerFiredCondition: A wrapper to use triggers within behaviour trees. Return false until the trigger has been fired.
• iParameterCheckCondition: A wrapper to use parameters within behaviour trees. Return whether or not the parameter is equal to the given value.
• iExecutionLimitDecorator: A decorator limiting the number of times a child is executed.
• iLoopDecorator: A loop decorator. It executes its child multiple times in a row.
• "cel.decorators.negatereturn": A negation decorator. It executes its child and returns the opposite of the result.

Definition at line 60 of file behaviourtree.h.

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Member Function Documentation

virtual bool iBTNode::AddChild

(

iBTNode *

child

)

[pure virtual]

Add a child node to this node.

virtual bool iBTNode::Execute

(

const celParams &

params

)

[pure virtual]

Execute this node.

Return whether or not the execution of the node was successful.

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The documentation for this struct was generated from the following file:

• tools/behaviourtree.h