I use Dia in conjunction with Inkscape and Gimp to produce the various forms
of output I need. I will make a screen dump and import that in to which
ever program is most appropriate.
Of course this limits me to only what I can get on screen, but that is
mostly good enough.
Ultimately, I find output from Dia, other than a screen dump, to be more
time consuming than I like. Even printing is uncertain enough that I
usually move the diagram into some other program for the final output, Word,
Open Office, Solidworks, Komposer, etc.