Class PDFunctionType4
java.lang.Object
org.apache.pdfbox.pdmodel.common.function.PDFunction
org.apache.pdfbox.pdmodel.common.function.PDFunctionType4
- All Implemented Interfaces:
COSObjectable
This class represents a Type 4 (PostScript calculator) function in a PDF document.
See section 3.9.4 of the PDF 1.4 Reference.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final InstructionSequence
private static final Operators
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionfloat[]
eval
(float[] input) Evaluates the function at the given input.int
Returns the function type.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, toString
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Field Details
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OPERATORS
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instructions
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Constructor Details
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PDFunctionType4
Constructor.- Parameters:
functionStream
- The function stream.- Throws:
IOException
- if an I/O error occurs while reading the function
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Method Details
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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 classPDFunction
- Returns:
- the function type.
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eval
Evaluates the function at the given input. ReturnValue = f(input)- Specified by:
eval
in classPDFunction
- 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:
IOException
- if something went wrong processing the function.
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