PTFunction

@interface PTFunction : NSObject

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.

  • Create a PDF::Function object from an existing SDF function dictionary. If funct_dict is null, a non valid Function object is created.

    Declaration

    Objective-C

    - (instancetype)initWithFunct_dict:(PTObj *)funct_dict;

    Swift

    init!(funct_dict: PTObj!)

  • Declaration

    Objective-C

    - (PTFunctionType)GetType;

    Swift

    func getType() -> PTFunctionType

    Return Value

    The function type

  • Declaration

    Objective-C

    - (int)GetInputCardinality;

    Swift

    func getInputCardinality() -> Int32

    Return Value

    the number of input components required by the function

  • Declaration

    Objective-C

    - (int)GetOutputCardinality;

    Swift

    func getOutputCardinality() -> Int32

    Return Value

    the number of output components returned by the function

  • Evaluate the function at a given point.

    Note

    that size of ‘in’ array must be greater than or equal to function input cardinality. and the size of ‘out’ array must be greater than or equal to function output cardinality.

    Declaration

    Objective-C

    - (NSMutableArray *)Eval:(NSMutableArray *)in_arr;

    Swift

    func eval(_ in_arr: NSMutableArray!) -> NSMutableArray!

  • Declaration

    Objective-C

    - (PTObj *)GetSDFObj;

    Swift

    func getSDFObj() -> PTObj!

    Return Value

    the underlying SDF/Cos object