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World: r3wp

[Postscript] Emitting Postscript from REBOL

Graham
13-Apr-2006
[465]
because you might only want to create a short postscript fragment 
rather than a script.
Geomol
13-Apr-2006
[466x3]
yes
We need information about, what can be inside one path, and how they 
are used in other PS files.
In my lates PS output, there is also a problem, where the box and 
the filled box is made. The box ends with a closepath and a stroke, 
but there is no newpath to start the next. I think, that's not 100% 
correct, but it seems to work.
Graham
13-Apr-2006
[469x3]
I didn't even use 'newpath !  :(
Ok, definitely need to find out when a newpath command is needed.
presumably, stroke, fill, and show close the existing path.
Geomol
13-Apr-2006
[472]
I read somewhere, that some PS operators force newpath, but it's 
bad practice to leave them out.
Graham
13-Apr-2006
[473]
maybe just make 'newpath a part of the dialect as well.
Geomol
13-Apr-2006
[474x5]
That is a problem, because we then leave it up to the user to make 
sure, the rules of PS holds. That's the same as writing PS directly, 
so not much is won.
A good dialect is one with some simple rules, and where it's difficult 
to produce something wrong.
We just need to know a little more, then we can make it almost perfect.
:)
I'm too tired now and am going to bed. Good night!
Henrik
13-Apr-2006
[479]
night
Graham
13-Apr-2006
[480]
but it makes it easier to program :)
Henrik
13-Apr-2006
[481]
is it me or does translate not work?
Graham
13-Apr-2006
[482]
I never got as far as implementing translate.  But John's has it.
Henrik
13-Apr-2006
[483]
it's john's version I'm trying it in
Graham
13-Apr-2006
[484x5]
mine works .. I'll upload it.
test3: form ps/header [
	gsave
	translate 72x72
	at 0x0 box 72x72 stroke
	grestore
	showpage
]
draws a box at 72x72 where origin is translated to 72x72
test3: form ps/header [
	gsave
	translate 72x72
	newpath
	at 0x0 box 72x72 stroke
	grestore
	showpage
]
{%!
%%Creator: ps.r ver 0.0.4
gsave
72 72 translate
newpath
0 0 moveto 72 0 rlineto 0 72 rlineto -72 0 rlineto closepath
stroke
grestore
showpage

%%EOF
Henrik
13-Apr-2006
[489]
ah, the good old copy trap. for the zillionth time I fell in.
Graham
13-Apr-2006
[490]
wait for R3 then!
Henrik
13-Apr-2006
[491]
this has to be working by april 22nd. so that's no go.
Graham
13-Apr-2006
[492]
watcha doing?
Henrik
13-Apr-2006
[493]
that barcode thing.
Graham
13-Apr-2006
[494x3]
ahh...
just numbers?
or full alphabet?
Henrik
13-Apr-2006
[497x2]
yes
no
Graham
13-Apr-2006
[499]
you can't use a postscript barcode font?
Henrik
13-Apr-2006
[500]
no, the barcode is already working fine. it's the position of the 
image on the paper and general arrangement of the code that needs 
to be worked out
Graham
13-Apr-2006
[501]
oh well, good luck.
Henrik
13-Apr-2006
[502]
thanks
Graham
13-Apr-2006
[503]
oh, how are you doing the image in postscript ?
Henrik
13-Apr-2006
[504]
just drawing lots of parallel lines
Graham
13-Apr-2006
[505]
ok, there's a hex format for images as well as using eps, but I don't 
know how that works.
Henrik
13-Apr-2006
[506x2]
interesting
like image! ?
Graham
13-Apr-2006
[508]
guess so.
Henrik
13-Apr-2006
[509x2]
ok I can rotate, but not translate
ah! I was using a pair! instead of two numbers
Graham
13-Apr-2006
[511x2]
Thinking of what John said, I suspect if you try and automate the 
newpath etc, you'll get into problems.
You'll be trying to write a better postscript than postscript .. 
.which may be possible!
Henrik
13-Apr-2006
[513x2]
I haven't been thinking of that yet.... but the ultimate goal should 
be to use postscript on a higher level
postscript [page [at 20x20 barcode 12345]]