[Squeakland] OLPC pen trails for turtle graphics

Bill Kerr billkerr at gmail.com
Wed Oct 31 22:57:07 PDT 2007


Simon Guest <simon.guest at tesujimath.org> wrote:
A simple script like this:

Repeat 2 times
   Star forward by 100
   Star turn by 90
---------------------------------

I can't see how to program
Repeat 2 times
in etoys
ie. to repeat something a certain number of times programmatically?

I tried in the text editor too but didn't work:
script3
4 timesRepeat:
    [self forward: 5 * 10.
    self turn: 90.
    self forward: 50]


-- =

Bill Kerr
http://billkerr2.blogspot.com/

On Oct 21, 2007 5:10 AM, Simon Guest <simon.guest at tesujimath.org> wrote:

> Hi,
>
> I'm just about to start my own kids off on some OLPC Etoys
> investigation, so I had a quick play, intending to make some turtle
> style polygons.  It didn't work as I expected.
>
> A simple script like this:
>
> Repeat 2 times
>    Star forward by 100
>    Star turn by 90
>
> did not leave an L shape trail as I expected, but a diagonal line from
> the start to the finish position.
>
> Is this how pen trails are supposed to work?  How do I draw a classic
> polygon, where the start and finish positions are the same?
> Currently no pen trail is left at all.
>
> cheers,
> Simon
>
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