pdftron::PDF::Function

pdftron::PDF::Function Class Reference

Although PDF is not a programming language it provides several types of function object that represent parameterized classes of functions, including mathematical formulas and sampled representations with arbitrary resolution. More...

#include <Function.h>

List of all members.

Public Types

enum Type { e_sampled = 0, e_exponential = 2, e_stitching = 3, e_postscript = 4 }

Public Member Functions

Function (SDF::Obj funct_dict=0)

Create a PDF::Function object from an existing SDF function dictionary.

Function (const Function &f)

Function & operator= (const Function &f)

~Function ()

Type GetType () const

Returns:
The function type

int GetInputCardinality ()

Returns:
the number of input components required by the function

int GetOutputCardinality ()

Returns:
the number of output components returned by the function

void Eval (double *in, double *out)

Evaluate the function at a given point.

SDF::Obj GetSDFObj ()

Returns:
the underlying SDF/Cos object

Detailed Description

Functions are used in various ways in PDF, including device-dependent rasterization information for high-quality printing (halftone spot functions and transfer functions), color transform functions for certain color spaces, and specification of colors as a function of position for smooth shadings. Functions in PDF represent static, self-contained numerical transformations.

PDF::Function represents a single, flat interface around all PDF function types.

Member Enumeration Documentation

enum pdftron::PDF::Function::Type

Enumerator:

e_sampled
e_exponential
e_stitching
e_postscript

Constructor & Destructor Documentation

pdftron::PDF::Function::Function ( SDF::Obj funct_dict = 0 )

Create a PDF::Function object from an existing SDF function dictionary.

If funct_dict is null, a non valid Function object is created.

pdftron::PDF::Function::Function ( const Function & f )

pdftron::PDF::Function::~Function ( )

Member Function Documentation

Function& pdftron::PDF::Function::operator= ( const Function & f )

Type pdftron::PDF::Function::GetType ( ) const

Returns:: The function type

int pdftron::PDF::Function::GetInputCardinality ( )

Returns:: the number of input components required by the function

int pdftron::PDF::Function::GetOutputCardinality ( )

Returns:: the number of output components returned by the function

void pdftron::PDF::Function::Eval	(	double *	in,
		double *	out
	)

Evaluate the function at a given point.

Note:: that size of 'in' array must be greater than or equal to function input cardinality. and the size of 'out' array must be greater than or equal to function output cardinality.

SDF::Obj pdftron::PDF::Function::GetSDFObj ( )

Returns:: the underlying SDF/Cos object


Public Types
enum	Type { e_sampled = 0, e_exponential = 2, e_stitching = 3, e_postscript = 4 }
Public Member Functions
	Function (SDF::Obj funct_dict=0)
	Create a PDF::Function object from an existing SDF function dictionary.
	Function (const Function &f)
Function &	operator= (const Function &f)
	~Function ()
Type	GetType () const
	Returns: The function type
int	GetInputCardinality ()
	Returns: the number of input components required by the function
int	GetOutputCardinality ()
	Returns: the number of output components returned by the function
void	Eval (double in, double out)
	Evaluate the function at a given point.
SDF::Obj	GetSDFObj ()
	Returns: the underlying SDF/Cos object