Package org.loboevolution.pdfview.function

Class FunctionType2

java.lang.Object

org.loboevolution.pdfview.function.PDFFunction

org.loboevolution.pdfview.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 inherited from class org.loboevolution.pdfview.function.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)	Subclasses must implement this method to perform the actual function on the given set of data.
float	getC0(int index)	Get the values at zero
float	getC1(int index)	Get the values at one
int	getNumOutputs()	Get the number of outputs, n, returned by this function
protected void	parse(PDFObject obj)	Read the function information from a PDF Object

Methods inherited from class org.loboevolution.pdfview.function.PDFFunction

calculate, calculate, getDomain, getFunction, getNumInputs, getRange, interpolate

Methods inherited from class java.lang.Object

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

Constructor Details

FunctionType2

public FunctionType2()

Creates a new instance of FunctionType2

Method Details

parse

protected void parse(PDFObject obj)
              throws IOException

Read the function information from a PDF Object

Read the zeros, ones and exponent

Specified by:

parse in class PDFFunction

Parameters:

obj - a PDFObject object.

Throws:

IOException - if any.

doFunction

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

Subclasses must implement this method to perform the actual function on the given set of data. Note that the inputs are guaranteed to be clipped to the domain, while the outputs will be automatically clipped to the range after being returned from this function.

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 - an array of

invalid reference

float

objects.

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()

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

getC0

public float getC0(int index)

Get the values at zero

Parameters:

index - a Integer object.

Returns:

a float.

getC1

public float getC1(int index)

Get the values at one

Parameters:

index - a Integer object.

Returns:

a float.