TerraGrid Class Reference

Grid operators. More...

#include <archestree.h>

Inheritance diagram for TerraGrid:

Public Member Functions
	TerraGrid (Box2=Box2(), int=10, int=10, int=1)
	Create a grid node.
	~TerraGrid ()
	Recusively destroy the sub-trees.
virtual ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute the elevation and weight.
Public Member Functions inherited from TerraNode
	TerraNode (const Box2 &=Box2::Infinity)
	Create a node.
virtual Box2	GetBox () const
	Returns the bouding box of a node.
virtual double	Elevation (const Vector2 &) const
	Compute the elevation at a given position.
virtual double	Alpha (const Vector2 &) const
	Compute the alpha mask at a given position.
virtual Vector2	Gradient (const Vector2 &) const
	Compute the gradient at a given position.
virtual Vector	Normal (const Vector2 &) const
	Compute the normal at a given position.
virtual void	writeJson (QJsonObject &)
	Compute the Json Document of the subtree.
virtual int	Traversal (const Vector2 &) const
	Compute the number of nodes that are traversed when evaluating the tree.
virtual int	Memory () const
	Compute the size of a node.
ScalarField2	Sample (const Array2 &) const
	Create a discrete scalar field by sampling the elevation over a given domain.
ScalarField2	Alpha (const Array2 &) const
	Create a discrete scalar field by sampling the elevation over a given domain.
void	Blend (HeightField &) const
	Blend a given node with an existing terrain over an input heightfield.
void	Add (HeightField &) const
	Add a given node with an existing heightfield.
virtual void	Draw (QGraphicsScene &) const
	Renders the node into a QGraphicsScene.

Protected Attributes
QVector< TerraNode * >	gridNodes
	Array of nodes.
Protected Attributes inherited from TerraNode
Box2	box = Box2::Infinity
	Bounding box.

Additional Inherited Members
Static Protected Attributes inherited from TerraNode
static const double	epsilon = 1e-2
	Epsilon value for gradient computations.

Detailed Description

Grid operators.

Constructor & Destructor Documentation

TerraGrid()

TerraGrid::TerraGrid ( Box2 bb = Box2(), int nxt = 10, int nyt = 10, int n = 1 )

explicit

Create a grid node.

Parameters

bb,nxt,nyt	Bounding box, x and y axis subdivison and radius of primitives.
n	Number of neighbors

References Array2::Array2(), TerraNode::box, Box2::Box2(), Array2::CellSize(), and gridNodes.

Member Function Documentation

ElevationAlpha()

ScalarAlpha TerraGrid::ElevationAlpha ( const Vector2 & p ) const

virtual

Compute the elevation and weight.

Parameters

p

Point.

Reimplemented from TerraNode.

References ScalarAlpha::Alpha(), Array2::AreaInteger(), TerraNode::box, Array2::CellIndex(), Array2::CellInteger(), TerraNode::ElevationAlpha(), gridNodes, TerraNode::TerraNode(), and ScalarAlpha::Value().