OK. Thanks Kyley. I'm only gonna go to those lengths if I implement a
specific "export to pdf" function (which ain't happening any time soon!).
Cheers,
Phil.
Kyley Harris wrote:
PDF has layers more for the ability for the viewer to have
flexability, not the printer. So If you create a map as a PDF, you
could have Street vector information as a seperate layer. When it goes
to print, the viewer is printing normal stuff based on layer visiblity
and Z order. Printers are pretty dumb. It is basically up to your data
to be stored as layers, and you choose what layers to print and when.
In reality, like Photoshop, you would want to alphablend the layers,
and then print one version to the printer. (which is what the PDF also
does).
I am not sure if the acrobat print driver would know squat about
layering. I have found that other 3rd party ones do a much better job.
I have my own pdf generator that I wrote which handles the simple
concepts of a TCanvas such as text, line, rectangle, bitmaps, new
page. adding layers is not really hard. a pdf document is just a flat
file database using object encapsulation. perhaps look at PDFtoolkit
from e-gnostice
Phil Middlemiss wrote:
Acrobat 6 introduced "layers" into a PDF - which is nice, but from a
developers point of view, we generally have generic code for printing
and rely on the print drivers to do the hard work. However, EPS has
always had layers (AFIK) and so perhaps there is a generic way to
indicate a new layer that would be ignored by the print driver if not
supported, but nicely recognised by Adobe's acrobat print driver to
create a new layer.
I *could* try and wade my way through the mind-numbing Adobe PDF
specification, but thought it was worth asking here if anyone has
done this already?
Cheers,
Phil.
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