new 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.
Methods
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<static> create(funct_dict)
-
Parameters:
Name Type Description funct_dict
Obj Returns:
A promise that resolves to an object of type: "Function"
- Type
- function
-
assign(right)
-
Copy Constructor
Parameters:
Name Type Description right
function -
destroy()
-
Frees the native memory of the object.
-
eval(inval, outval)
-
Parameters:
Name Type Description inval
number outval
number -
getInputCardinality()
-
Returns:
A promise that resolves to the number of input components required by the function
- Type
- number
-
getOutputCardinality()
-
Returns:
A promise that resolves to the number of output components returned by the function
- Type
- number
-
getSDFObj()
-
Returns:
A promise that resolves to the underlying SDF/Cos object
- Type
- Obj
-
getType()
-
Returns:
A promise that resolves to the function type
- Type
- number
Example
Return value enum: <pre> PDFNet.Function.Type = { e_sampled : 0 e_exponential : 2 e_stitching : 3 e_postscript : 4 } </pre>