Terra2015ReplaceAlpha Class Reference

A replacement operator. More...

#include <archestree.h>

Inheritance diagram for Terra2015ReplaceAlpha:

Public Member Functions
	Terra2015ReplaceAlpha (TerraNode *, TerraNode *)
	Create a replace node with two children nodes.
	~Terra2015ReplaceAlpha ()
	Recursively destroys the complete sub-tree.
virtual ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute the elevation and weight.
Public Member Functions inherited from TerraBinary
	TerraBinary (TerraNode *, TerraNode *)
	Create a binary node.
virtual	~TerraBinary ()
	Recusively destroy the sub-trees.
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.
virtual void	Draw (QGraphicsScene &) const
	Renders the node into a QGraphicsScene.
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.

Additional Inherited Members
Protected Attributes inherited from TerraBinary
TerraNode *	a = nullptr
	Left sub-tree.
TerraNode *	b = nullptr
	Right sub-tree.
Protected Attributes inherited from TerraNode
Box2	box = Box2::Infinity
	Bounding box.
Static Protected Attributes inherited from TerraNode
static const double	epsilon = 1e-2
	Epsilon value for gradient computations.

Detailed Description

A replacement operator.

This operator replaces the first primitive with the new one according to the alpha channel.

Constructor & Destructor Documentation

Terra2015ReplaceAlpha()

Terra2015ReplaceAlpha::Terra2015ReplaceAlpha ( TerraNode * a, TerraNode * b )

explicit

Create a replace node with two children nodes.

Parameters

a,b	Sub-trees.

References TerraBinary::a, TerraBinary::b, and TerraBinary::TerraBinary().

Member Function Documentation

ElevationAlpha()

ScalarAlpha Terra2015ReplaceAlpha::ElevationAlpha ( const Vector2 & p ) const

virtual

Compute the elevation and weight.

Parameters

p

Point.

Reimplemented from TerraNode.

References TerraBinary::a, TerraBinary::b, TerraNode::box, and ScalarAlpha::Empty.