Class PDFunctionType4

java.lang.Object
org.apache.pdfbox.pdmodel.common.function.PDFunction
org.apache.pdfbox.pdmodel.common.function.PDFunctionType4
All Implemented Interfaces:
COSObjectable

public class PDFunctionType4 extends PDFunction
This class represents a type 4 function in a PDF document.

See section 3.9.4 of the PDF 1.4 Reference.

Version:
$Revision: 1.2 $
  • Constructor Details

    • PDFunctionType4

      public PDFunctionType4(COSBase functionStream) throws IOException
      Constructor.
      Parameters:
      functionStream - The function stream.
      Throws:
      IOException - if an I/O error occurs while reading the function
  • Method Details

    • 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 IOException
      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:
      IOException - an IOExcpetion is thrown if something went wrong processing the function.