From: Bill Kendrick <nbs@so...> - 2009-11-21 18:03:08
When I was a kid, I used Logo a bit (just the turtle graphics part)
in a few classes in elementary school -- this was on green-screen Apple IIs.
At home, I had an Atari 8-bit computer (256 glorious colors) and
ended up with a cartridge called "Delta Drawing" by Spinnaker (an educational
software company that, if I read correctly, got absorbed by what became
The Learning Company.)
Delta Drawing was a lot different from Logo. It was far simpler
(not that I have any experience with Logo outside of the turtle graphics),
and more immediate.
It didn't use a split-screen with commands at the bottom, and graphics
at the top. You were simply faced with a "^"-shaped cursor (turtle)
in the center of the screen, and you issued single-keystroke commands
which it executed immediately.
[D] - draw a line
[Shift] + [D] - draw a small line
[Ctrl] + [D] - draw a single pixel
[R] - rotate right (clockwise) (30 degrees, I believe)
[Shift] + [R] - rotate right a little less (15 degrees?)
[Ctrl] + [R] - rotate right 1 degree
You could also ask it to repeat, e.g. to rotate 90 degrees
you'd type  [R] (or alternatively, I guess,   [Ctrl]+[R]).
If you hit [Backspace], the commands you issued would be undone,
one by one.
You could go in and view your program (all commands were just those
Well, I decided to do something like this in SDL. I've implemented
subroutines in a cute (I think!) way. The turtle 'dreams' of
what it will do, in a little subwindow. (Imagine it with fluffly
clouds :) )
See a video of it here on YouTube. I've annotated it, and put
a bit of detail into the description.
Gotta run. Enjoy!
Sent from my computer
From: Ben Armstrong <synrg@sa...> - 2009-11-22 13:23:27
On Sat, 21 Nov 2009 10:02:51 -0800
Bill Kendrick <nbs@...> wrote:
> Well, I decided to do something like this in SDL. I've implemented
> subroutines in a cute (I think!) way. The turtle 'dreams' of
> what it will do, in a little subwindow. (Imagine it with fluffly
> clouds :) )
> See a video of it here on YouTube. I've annotated it, and put
> a bit of detail into the description.
Nice! For a long time, I've wished there were something more
kid-friendly than ucblogo or kturtle in Debian that younger kids might
use to do Logo or Logo-like activities. I like the easy keyboard entry,
and the dream metaphor is a great idea. :)
From: Bill Kendrick <nbs@so...> - 2009-12-03 20:48:26
On Sat, Nov 21, 2009 at 10:02:51AM -0800, Bill Kendrick wrote:
> Delta Drawing was a lot different from Logo. It was far simpler
> (not that I have any experience with Logo outside of the turtle graphics),
> and more immediate.
I've created a site for the project, and the current (somewhat broken,
and with TONs left to work on) source-code is available in the
"SVN" source code repository, for folks who are able and inclined
to download pre-alpha-quality code and compile it themselves. :)
I need to set up some mailing lists, for folks who are interested
in development, using it, and translating it.