Package org.loboevolution.pdfview.function

Class FunctionType4

java.lang.Object

org.loboevolution.pdfview.function.PDFFunction

org.loboevolution.pdfview.function.FunctionType4

public class FunctionType4
extends PDFFunction

A PostScript function is represented as a stream containing code written in a small subset of the PostScript language. This reference is taken from the (3200-1:2008:7.10.5)

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Field Summary

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

TYPE_0, TYPE_2, TYPE_3, TYPE_4

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FunctionType4()	Creates a new instance of FunctionType4

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.
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, getNumOutputs, getRange, interpolate

Methods inherited from class java.lang.Object

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

Constructor Details

FunctionType4

protected FunctionType4()

Creates a new instance of FunctionType4

Method Details

parse

protected void parse(PDFObject obj)
              throws IOException

Read the function information from a PDF Object

Read the function information from a PDF Object

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.

Map from m input values to n output values. The number of inputs m must be exactly one half the size of the domain. The number of outputs should match one half the size of the range.

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