Package org.apache.pdfbox.pdmodel.common.function

Class PDFunctionType2

java.lang.Object

org.apache.pdfbox.pdmodel.common.function.PDFunction

org.apache.pdfbox.pdmodel.common.function.PDFunctionType2

All Implemented Interfaces:

COSObjectable

public class PDFunctionType2
extends PDFunction

This class represents a Type 2 (exponential interpolation) function in a PDF document.

Author:

Ben Litchfield

Constructor Summary

Constructors

Constructor	Description
PDFunctionType2(COSBase function)	Constructor.

Method Summary

Modifier and Type	Method	Description
float[]	eval(float[] input)	Performs exponential interpolation Evaluates the function at the given input.
COSArray	getC0()	Returns the C0 values of the function, 0 if empty.
COSArray	getC1()	Returns the C1 values of the function, 1 if empty.
int	getFunctionType()	Returns the function type.
float	getN()	Returns the exponent of the function.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from class org.apache.pdfbox.pdmodel.common.function.PDFunction

clipToRange, clipToRange, create, eval, getCOSObject, getDomainForInput, getNumberOfInputParameters, getNumberOfOutputParameters, getPDStream, getRangeForOutput, getRangeValues, interpolate, setDomainValues, setRangeValues

Constructor Detail

PDFunctionType2

public PDFunctionType2(COSBase function)

Constructor.

Parameters:

function - The function.

Method Detail

getFunctionType

public int getFunctionType()

Returns the function type. Possible values are: 0 - Sampled function 2 - Exponential interpolation function 3 - Stitching function 4 - PostScript calculator function

Specified by:

getFunctionType in class PDFunction

Returns:

the function type.

eval

public float[] eval(float[] input)
             throws java.io.IOException

Performs exponential interpolation Evaluates the function at the given input. ReturnValue = f(input)

Specified by:

eval in class PDFunction

Parameters:

input - The array of input values for the function. In many cases will be an array of a single value, but not always.

Returns:

The of outputs the function returns based on those inputs. In many cases will be an array of a single value, but not always.

Throws:

java.io.IOException - an IOExcpetion is thrown if something went wrong processing the function.

getC0

public COSArray getC0()

Returns the C0 values of the function, 0 if empty.

Returns:

a COSArray with the C0 values

getC1

public COSArray getC1()

Returns the C1 values of the function, 1 if empty.

Returns:

a COSArray with the C1 values

getN

public float getN()

Returns the exponent of the function.

Returns:

the float value of the exponent

toString

public java.lang.String toString()

Overrides:

toString in class PDFunction