Re: LOGO-L> Postscriptformat for turtlegraphics ?

[George Mills <mills@softronix.com>]

Gerhard Reuteler wrote:
> 
> I have asked this question already, but no helpfull answer reached me.
> I'm still unhappy about the fact, that the nice graphics, done by the
> turtle, looks poor on paper. Is there a piece of software, which converts
> the turtle's work into a protocol in the postscriptformat??
> Thank you for your help!

Note that someone did post some postscript generation code.
And in fact I believe someone is talking about postscript
generation at the eurologo conference.

However the "lost" resolution is not due to the lack of postscript.

I don't know which Logo you use, but you have a valid gripe.

The lost resolution is often due to tradeoffs in WYSIWYG and
Performance.
Storing your work as "Commands" or as a "Bitmap". They both have
tradeoffs. MswLogo uses a bitmap.

I just made a small change to MSWLogo which will allow you to use
the full resolution of the printer. However to use this feature you'll
need a fair bit of memory. It's available now in the "Beta 2" kit which
I just re-uploaded.

The way MSWLogo prints is that it maps 100 "Turtle" pixels to an inch of
Printed paper (no matter) what the resolutions. This way you get
"reasonable"
sized printouts for the "normal" 1000x1000 pixel Turtle workspace
regardless
of printer capabilities.

What I did was make this "100 pixels to an inch" an option in the
"ActiveArea" dialog. If you set it to 600 then 600 turtle pixels
will be mapped to 600 dots per inch on the printed media.

However, you used to have 1000/100 x 1000/100 inches of turtle workspace
to print.
But now you only have 1000/600 x 1000/600 inches of workspace to print.
But you can increase the workspace (as long as you have the memory !!!).

Here is an example:

600 dpi HP laser printer

If you want maximum resolution printed then set the new option to 600.
If you want to be able to draw on most of the paper then increase your
workspace to 8 inches by 8 inches which would be 8*600 x 8*600 pixels.

LOGO32.EXE -w 4800 -h 4800

But remember that is a HUGE amount of memory:

23 meg !!! when in 256 color mode.
11.5 meg !!! when in 16 color mode.

Note also that your print driver may choke when it gets this
huge bitmap (but you don't have to print the whole thing).

You also have to draw pictures big enough to span the
page (larger turtle workspace).

I just tried:

LOGO32.EXE -w 4800 -h 4800 (in 16 color mode on a 32meg machine)
repeat 72 [repeat 4 [fd 2000 rt 90] rt 5]
And printed the whole image and it worked great.

The lines are razor sharp.

This will work on Font's, Bitmaps, Ellipse, Fill etc. too.

You can also compromise by just doubling your resolution.
For example LOGO32.EXE -w 2000 -h 2000 and set the new option
to 200. Which will increase Logo's memory usage from 1 meg
to 4 meg for a user in 256 color mode. 200 dots per inch is
pretty good too.

-- 
===============================================================
George Mills
email: mills@softronix.com
http://www.softronix.com
The www page contains some very powerful educational software.
Our single most important investment is our kids.

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