TerraDisc Class Reference

A disc primitive. More...

#include <archestree.h>

Inheritance diagram for TerraDisc:

Public Member Functions
	TerraDisc (const Disc2 &, const double &, const double &, const double &=1.0)
	Create a flat disc primitive.
virtual ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute the elevation and weight.
virtual int	Memory () const
	Compute the size of a node.
void	Draw (QGraphicsScene &) const
	Renders the node into a QGraphicsScene.
Public Member Functions inherited from TerraPrimitive
	TerraPrimitive (const double &=1.0, const double &=1.0)
	Create a primitive.
	~TerraPrimitive ()
	Recusively destroy the sub-trees.
int	Traversal (const Vector2 &) const
	Compute the number of nodes that are traversed when evaluating the tree.
double	Alpha (const double &) const
	Compute the falloff function.
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.
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.

Protected Attributes
Disc2	disc
	Disc.
double	z
	Elevation.
Protected Attributes inherited from TerraPrimitive
double	alpha = 1.0
	Weight.
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

A disc primitive.

Constructor & Destructor Documentation

TerraDisc()

TerraDisc::TerraDisc	(	const Disc2 &	d,
		const double &	z,
		const double &	r,
		const double &	a = 1.0 )

Create a flat disc primitive.

Parameters

d	Disc.
z	Elevation.
r	Radius.
a	Alpha.

References TerraNode::box, disc, Circle2::GetBox(), TerraPrimitive::TerraPrimitive(), and z.

Referenced by Memory(), and TerraDiscNoise::TerraDiscNoise().

Member Function Documentation

Draw()

void TerraDisc::Draw ( QGraphicsScene & scene ) const

virtual

Renders the node into a QGraphicsScene.

Parameters

scene

The scene.

Reimplemented from TerraNode.

References disc.

ElevationAlpha()

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

virtual

Compute the elevation and weight.

Parameters

p

Point.

Reimplemented from TerraNode.

Reimplemented in TerraDiscNoise.

References TerraPrimitive::Alpha(), TerraNode::box, disc, and z.

Memory()

int TerraDisc::Memory ( ) const

virtual

Compute the size of a node.

Reimplemented from TerraNode.

Reimplemented in TerraDiscNoise.

References TerraDisc().