Hi,
Daniel Wilson schrieb:
The gradients I'm trying to implement for PDFBOX-615 are defined in part by
functions.
We are parsing the functions and instantiating derivatives of PDFunction ...
but I can't find anything that evaluates the function. e.g. if I pass the
function 2, what does it return?
A quick grep didn't find any such examples ... in fact the only classes that
contain an instance of PDFunction are PDDeviceN and PDSeparation, both of
which return an empty function rather than returning the one that the class
was loaded with.
Is this a known gap in our support of functions? Does someone know where,
in fact, we do use them? Or is this one of those things, no one's really
sure about?
That is a known gap. Have a look at [1]. I thought that I understood how these
functions work, but when I tried to implement e.g FunctionType2 I'd realized
that I didn't. Obviously it is a little bit more tricky than I expected or
probably it is just my limited ability to understand complex english texts.
Thanks!
Daniel
BR
Andreas Lehmkühler
[1] https://issues.apache.org/jira/browse/PDFBOX-519
