Menge::SceneGraph::GLNode Class Reference

An abstact class – a generic, scene graph node. More...

#include <GLNode.h>

Inheritance diagram for Menge::SceneGraph::GLNode:

Public Member Functions
	GLNode (GLDagNode *parent=0x0)
	Constructor. More...
virtual	~GLNode ()
	Virtual destructor.
void	setVisible (bool state)
	Sets the visible state of the node. More...
virtual void	drawGL (bool select=false)=0
	Causes this node to draw itself to the scene. More...
virtual void	newContext ()
	Allows the node to recreate any unique OpenGL objects based on the acquisition of a new OpenGL context. More...
GLDagNode *	getParent ()
	Returns a pointer to the node's parent (possibly NULL). More...

Protected Member Functions
void	setParent (GLDagNode *p)
	Assigns this node to a parent GLDagNode. More...

Protected Attributes
GLDagNode *	_parent
	The GLDagNode that serves as this node's parent.
bool	_visible
	The visibility state of this node. If visible (true) the node and its children will be drawn into the scene, if invisible (false) it will not be drawn.

Friends
class	GLDagNode

Detailed Description

An abstact class – a generic, scene graph node.

A GLNode can be included in a hierarchy, but cannot take children. It is the basic entity that forms the "graph" of the scene graph. It cannot be added to the scene but must be sub-classed.

Constructor & Destructor Documentation

Menge::SceneGraph::GLNode::GLNode

(

GLDagNode *

parent = 0x0

)

Constructor.

Parameters

parent

A pointer to the optional parent node in the graph.

Member Function Documentation

virtual void Menge::SceneGraph::GLNode::drawGL ( bool  select = false )

pure virtual

Causes this node to draw itself to the scene.

This is a purely virtual function. Every node in the graph must implement this function.

Parameters

select

Determines if the draw call is being performed for the purpose of selection (true) or for visualization (false).

Implemented in Menge::SceneGraph::Cylinder, Menge::SceneGraph::Transform, Menge::SceneGraph::GLDagNode, Menge::SceneGraph::Circle, Menge::SceneGraph::GLGroundPlane, Menge::VisAgent, and Menge::VisObstacle.

GLDagNode* Menge::SceneGraph::GLNode::getParent ( )

inline

Returns a pointer to the node's parent (possibly NULL).

Returns

A pointer to a parent node – if no parent, it returns NULL (0x0).

virtual void Menge::SceneGraph::GLNode::newContext ( )

inlinevirtual

Allows the node to recreate any unique OpenGL objects based on the acquisition of a new OpenGL context.

This should be over-ridden by nodes that have their own unique OpenGL constructs (display lists, textures, etc.)

Reimplemented in Menge::SceneGraph::GLDagNode, and Menge::SceneGraph::GLGroundPlane.

void Menge::SceneGraph::GLNode::setParent ( GLDagNode *  p )

inlineprotected

Assigns this node to a parent GLDagNode.

Nodes should be linked by calling GLDagNode::addChild.

Parameters

p	The pointer to the new parent node.

void Menge::SceneGraph::GLNode::setVisible ( bool  state )

inline

Sets the visible state of the node.

A node which is not visible does not draw in the scene. Nor does any child or child-tree that the node has.

Parameters

state

The desired visible state. True for a visible node that will be drawn, false for invisible.

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The documentation for this class was generated from the following files:

• src/menge/MengeCore/SceneGraph/GLNode.h
• src/menge/MengeCore/SceneGraph/GLNode.cpp