Class Function

Although PDF is not a programming language it provides several types of function object that represent parameterized classes of functions, including mathematical formulas and sampled representations with arbitrary resolution. Functions are used in various ways in PDF, including device-dependent rasterization information for high-quality printing (halftone spot functions and transfer functions), color transform functions for certain color spaces, and specification of colors as a function of position for smooth shadings. Functions in PDF represent static, self-contained numerical transformations.

PDF::Function represents a single, flat interface around all PDF function types.

Inheritance

System.Object

Function

Implements

System.IDisposable

Inherited Members

System.Object.ToString()

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.MemberwiseClone()

Namespace: pdftron.PDF

Assembly: PDFNet.dll

Syntax

public class Function : IDisposable

Methods

Create(Obj)

Create a PDF::Function object from an existing SDF function dictionary.

Declaration

public static Function Create(Obj function)

Parameters

Type	Name	Description
Obj	function	the funct_dict

Returns

Type	Description
Function	newly created Function object

Dispose()

Releases all resources used by the Function

Declaration

public override sealed void Dispose()

Dispose(Boolean)

Declaration

[HandleProcessCorruptedStateExceptions]
protected virtual void Dispose(bool A_0)

Parameters

Type	Name	Description
System.Boolean	A_0

Eval(Double[], Double[])

Evaluate the function at a given point.

Declaration

public virtual void Eval(double[] in, double[] out)

Parameters

Type	Name	Description
System.Double[]	in	the in
System.Double[]	out	the double[]

Remarks

that size of 'in' array must be greater than or equal to function input cardinality.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

Finalize()

Allows a Function to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.

Declaration

protected void Finalize()

GetInputCardinality()

Gets the input cardinality.

Declaration

public int GetInputCardinality()

Returns

Type	Description
System.Int32	the number of input components required by the function

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetOutputCardinality()

Gets the output cardinality.

Declaration

public int GetOutputCardinality()

Returns

Type	Description
System.Int32	the number of output components returned by the function

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetSDFObj()

Gets the SDFObj.

Declaration

public Obj GetSDFObj()

Returns

Type	Description
Obj	the underlying SDF/Cos object

GetType()

Gets the type.

Declaration

public virtual Function.Type GetType()

Returns

Type	Description
Function.Type	The function type

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

Implements

System.IDisposable