World: r3wp

Any ideas?

must be a case problem.

works here ok, must be a connection problem

yes, try now

now it works

Now it works. It seems, it take a little time, before tiscali makes 
content reachable.

Ok, looks okay.  But each element needs to be placed on the page.

?

you need to tell the postscript engine where to place the text.

eg. 72 72 moveto

which is one inch from the left bottom edge

It's a start.
What happen, if you leave out that part?

nothing happens I suspect.

there's also a postscript preamble or header.

%!PS-Adobe-3.0
%%Creator: Synapse-EMR 3.01
%%LanguageLevel: 2

Oh, misunderstood.
Try:
s: postscript [font ["Times-Roman" 20] [at 72x72 "Hello World!"]]

You can position with AT pair!

Now the dialect has to be defined precisely with all the functionality, 
we want.

gsave
 .75 setgray
 /Helvetica-Bold findfont 72 scalefont setfont
 72 100 moveto
 (Hello World!)	 show
 grestore

I would save the state and then restore it.

I need to learn more about PostScript.

Do you have to specify the pen colour or not ?

this ..  .75 setgray uses a gray colour for the text.

The dialect can't cope with that yet.

This is a good start though.

So far, you can specify font, set position and print text.

so, you need also the %! at the beginning, and a showpage at the 
end.

things like 'box can be defined as a function in postscript.

Desitions have to be made about the dialect structure. Should the 
outer block consist of font-specifications and pages, or isn't that 
structure the best for PS? A better understanding of PS is needed 
to answer.

so, you would probably need some predefined functions that are also 
emitted.

Is the main aim to do text, or translate draw images?

I would aim for an implementation of PS functionality as a REBOL 
dialect. Nothing to do with draw yet.

we have Gabriele's pdf dialect to use a model.

his dialect must cover the same problems .. as pdf is a subset of 
postscript.

at 72x72 font Helvetica-Bold 6.0 "Hello World!"

I'll look at all the PS operators to get a view of the whole thing. 
Then define a structure for the dialect (probably top-concept of 
a page), and then implement the operators most needed.

this looks easier to write.

Would it be normal in PS to define the font before anything else, 
and then describe pages with paths? Is that the structure?

I wonder if we can't just use Gabriele's dialect and build a different 
emitter.

I'm not sure .. I've only read about postscript in the last day.

It'll take time for me to read others dialect rules. It'll probably 
be faster for me to make the dialect, so I know, what's going on 
everywhere.

New version. The postscript block consists of font definitions and 
pages. A page consists of paths and transformations. Try:
do http://home.tiscali.dk/john.niclasen/postscript/postscript.r

print postscript [font [Times-Roman 20] page [path [at 72x72 rotate 
45 "Hello World!"]]]

The "page" and "path" words are optional, so this'll give same result:

print postscript [font [Times-Roman 20] [[at 72x72 rotate 45 "Hello 
World!"]]]

A postscript block can have several pages, and every page can have 
several paths.

I found this document describing PostScript structure:

http://partners.adobe.com/public/developer/en/ps/5001.DSC_Spec.pdf

PostScript has a lot of operators (commands). For this REBOL dialect 
to be usefull, we should keep the number of features at a minimum. 
It's always hard to learn something new, and if the number of commands 
is too big, less will use it. I would like feedback on, what features 
should be supported in the dialect for a first version. This dialect 
can then be used in REBOL programs, that would like to do PostScript 
output. And I could make a PostScript output from my NicomDoc format. 
And then we could also have a DRAW -> PS converter.

I don't want to interrupt your concrete talk here, but I think I 
was a bit misunderstood. By "or forget it" I did not mean forget 
bringing PS to rebol, but "it" was pointing to ghostviewer. I am 
the last, who would not want to do everything in Rebol. So Henrik 
actually contradicts himself a bit stating that he wants to limit 
number of external apps = bring PS to rebol, but then how to do a 
preview?

PS -> VIEW maybe?

In fact - my question could be just simplified - how do we do print 
preview without GhostView or other PS viewer tools? If that is "somehow" 
possible, then it is only good. That is why I referred to the need 
of AGG based preview, to actually save third app usage - a PS viewer.

sorry, PS -> DRAW