It should be possible... You need to create a dictionary the hard way,
with everything, and don't forget the function. It starts like this:
COSDictionary dict = new COSDictionary();
then you set the elements. It should not be too difficult, if you KNOW
what an axial shading is. Here's a segment in postscript:
<<
/ShadingType 2
/ColorSpace [ /DeviceRGB ]
/Coords [100 400 400 600 ]
/Function <<
/FunctionType 2
/Domain [ 0 1 ]
/C0 [ 1 0 0 ]
/C1 [ .5 1 .5 ]
/N 1
>>
>>
This is the same in PDF:
14 0 obj
<< /ColorSpace /DeviceRGB
/Coords [ 100 400 400 600 ]
/Function 15 0 R
/ShadingType 2 >>
endobj
15 0 obj
<<
/C0 [ 1 0 0 ]
/C1 [ 0.5 1 0.5 ]
/Domain [ 0 1 ]
/FunctionType 2
/N 1 >>
endobj
So basically you have to set all these elements, note that coords is an
array, and function is itself a dictionary again. Try it, and if it
doesn't work, post your code here. Good luck!
Tilman
Am 15.07.2014 20:44, schrieb Adriaan Joubert:
Hi,
I need to draw an axial gradient with PdfBox, but have not found an example
of how to do this. I'm using pdfbox 1.8.6.
I need to add a PDFunctionType2, but this always takes a dictionary - which
suggests that this is only implemented for reading documents?
I somehow need to create a PDShadingType2 so that I can initialise an
AxialShadingPaint.
Does anybody have a small example of how to draw a gradient, or give me any
idea of how to proceed?
Thanks,
Adriaan
