Class FunctionType2

java.lang.Object

org.openpdf.renderer.function.PDFFunction

org.openpdf.renderer.function.FunctionType2

public class FunctionType2
extends PDFFunction

A type 2 function is an exponential interpolation function, which maps from one input value to n output values using a simple exponential formula.

Field Summary

Fields

Modifier and Type	Field	Description
private float[]	c0	the function's value at zero for the n outputs
private float[]	c1	the function's value at one for the n outputs
private float	n	the exponent

Fields inherited from class PDFFunction

TYPE_0, TYPE_2, TYPE_3, TYPE_4

Constructor Summary

Constructors

Constructor	Description
FunctionType2()	Creates a new instance of FunctionType2

Method Summary

Modifier and Type	Method	Description
protected void	doFunction(float[] inputs, int inputOffset, float[] outputs, int outputOffset)	Calculate the function value for the input.
float	getC0(int index)	Get the values at zero
float	getC1(int index)	Get the values at one
float	getN()	Get the exponent
int	getNumOutputs()	Get the number of outputs, n, returned by this function
protected void	parse(PDFObject obj)	Read the zeros, ones and exponent
protected void	setC0(float[] c0)	Set the values at zero
protected void	setC1(float[] c1)	Set the values at one
protected void	setN(float n)	Set the exponent

Methods inherited from class PDFFunction

calculate, calculate, getDomain, getFunction, getNumInputs, getRange, getType, interpolate, setDomain, setRange

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

c0

private float[] c0

the function's value at zero for the n outputs

c1

private float[] c1

the function's value at one for the n outputs

n

private float n

the exponent

Constructor Details

FunctionType2

public FunctionType2()

Creates a new instance of FunctionType2

Method Details

parse

protected void parse(PDFObject obj)
              throws IOException

Read the zeros, ones and exponent

Specified by:

parse in class PDFFunction

Throws:

IOException

doFunction

protected void doFunction(float[] inputs,
 int inputOffset,
 float[] outputs,
 int outputOffset)

Calculate the function value for the input. For each output (j), the function value is: C0(j) + x^N * (C1(j) - C0(j))

Specified by:

doFunction in class PDFFunction

Parameters:

inputs - guaranteed to be at least as big as getNumInputs() and all values within range

inputOffset - the offset into the inputs array to read from

outputs - guaranteed to be at least as big as getNumOutputs(), but not yet clipped to domain

outputOffset - the offset into the output array to write to

getNumOutputs

public int getNumOutputs()

Description copied from class: PDFFunction

Get the number of outputs, n, returned by this function

Overrides:

getNumOutputs in class PDFFunction

Returns:

the number of output values this function will return

getN

public float getN()

Get the exponent

setN

protected void setN(float n)

Set the exponent

getC0

public float getC0(int index)

Get the values at zero

setC0

protected void setC0(float[] c0)

Set the values at zero

getC1

public float getC1(int index)

Get the values at one

setC1

protected void setC1(float[] c1)

Set the values at one