Subject:
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Re: Building a Postscript printer?
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 24 Jun 2000 00:22:09 GMT
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Viewed:
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849 times
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In lugnet.robotics, Manoj Plakal writes:
>
> Well, I wasn't really thinking that I would cram the whole
> Postscript interpreter into the RCX. Instead, I was going
> to structure it as a Postscript interpreter (running on
> the host PC) talking to a rendering device (the RCX).
> So the RCX itself need only implement a few simple
> functions (pen up/down, move, turn etc) while the
> Postscript interpreter on the PC figures out the
> sequence of commands to feed it.
>
> Due to the limitations of the RCX as a renderer, not
> all Postscript programs are going to be printable. So
> we also some kind of a filter which only allows "well-formed"
> Postscript programs. E.g., embedded bitmaps would be
> a no-no. And fonts would have to be simple. Lines might
> have limitations on their slopes. Dunno what else.
>
> After an initial implementation, more and more could be
> crammed into the RCX to simplify the job of the host
> filter and interpreter. In theory.
>
> Is it possible for a host PC program to communicate with
> a downloaded program which is running on the RCX? Two-way
> communication, that is.
>
> Manoj
>
>
> In lugnet.robotics, Brian Connors writes:
> > --- Manoj Plakal <plakal@no-spam.cs.wisc.edu> wrote:
> > >
> > > Hello,
> > >
> > > I'm completely new to the Lego Mindstorms scene. I
> > > was
> > > thinking about getting RIS 1.5 this summer, and one
> > > cool
> > > project I was thinking about was building a robot
> > > that could be used as a printer or plotter of vector
> > > graphics • [snip]
> > However, a PostScript language subset isn't such a bad
> > idea; what you'd be creating would be the basic
> > PostScript interpreter (in LegOS or some such), with a
> > simple implementation of the language and primitives
> > to control either (low-level) the RCX itself or
> > (high-level) draw the picture. Either way you're
> > talking about a firmware replacement, not a
> > quick-and-dirty RCXcode hack.
> >
> > /Brian
> >
> > =====
> > --
I might suggest taking a look at the Postscript code
generated by AdobeStreamline. I used it in a Vector
Terminal application and it worked quite well.
Postcript header and most of the eps can be ignored
and just process the Macro'ed data points and Stroke!
Writting a more robust handler with whole PS code is
a waste, cut to the chase.
You can get a demo version of streamline to check it out.
DaveG
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Message is in Reply To:
 | | Re: Building a Postscript printer?
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| Well, I wasn't really thinking that I would cram the whole Postscript interpreter into the RCX. Instead, I was going to structure it as a Postscript interpreter (running on the host PC) talking to a rendering device (the RCX). So the RCX itself (...) (24 years ago, 24-Jun-00, to lugnet.robotics)
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