TFTexture Class Reference

The transfer function. More...

List of all members.

Public Member Functions

• TFTexture (QWidget *parent)
• ~TFTexture (void)
• void addNode (TFNode node)
• void removeNode (GLuint x)
• void clear (void)
• std::map< int, TFNode >::iterator begin ()
• std::map< int, TFNode >::iterator end ()
• void setFBO (GLuint fbo, GLuint texture)
• void generate (void)
• void setHistogram (int *histogram)

Public Attributes

• float histogram [256]

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Detailed Description

This class represents the transfer function as an ordered collection of TFNodes. It also generates the texture for the transfer function used by the shaders.

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Constructor & Destructor Documentation

TFTexture::TFTexture

(

QWidget *

parent

)

Constructor.

Initialises the transfer function with a few default values.

Parameters:

parent

The widget using this transfer function.

See also:

~TFTexture()

TFTexture::~TFTexture

(

void

)

Default destructor.

See also:

TFTexture()

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Member Function Documentation

void TFTexture::addNode

(

TFNode

node

)

Adds a node to the transfer function.

Wrapper function for the underlying map's insert().

Parameters:

node

The node to add.

See also:

removeNode(), clear()

void TFTexture::removeNode

(

GLuint

x

)

Removes a node from the transfer function.

Wrapper function for the underlying map's erase().

Parameters:

x

The x-coordinate of the node to remove.

See also:

addNode(), clear()

void TFTexture::clear

(

void

)

Clears the transfer function.

Wrapper function for the underlying map's clear().

See also:

addNode(), removeNode()

std::map< int, TFNode >::iterator TFTexture::begin

(

)

Returns an iterator at the first node.

Wrapper function for the underlying map's begin().

Returns:

The iterator at the beginning of the map.

See also:

end()

std::map< int, TFNode >::iterator TFTexture::end

(

)

Returns an iterator at the last node.

Wrapper function for the underlying map's end().

Returns:

The iterator at the end of the map.

See also:

begin()

void TFTexture::setFBO	(	GLuint	fbo,
		GLuint	texture
	)

Sets the frame buffer and texture used to generate the transfer function.

Parameters:

	fbo	The OpenGL id of the frame buffer to use.
	texture	The OpenGL id of the texture to use.

void TFTexture::generate

(

void

)

Generates the texture that stores the transfer function.

Draws a number of quads, interpolating linearly between the colours and opacities of each pair of nodes.

void TFTexture::setHistogram

(

int *

histogram

)

Sets the histogram used in the transfer function display.

Parameters:

histogram

The histogram data.