[squeakland] Etoys programming question, clear pen trails from a textfield.

mokurai at earthtreasury.org mokurai at earthtreasury.org
Fri Jan 11 12:42:24 EST 2013

Thank you. I will make sure that this is clarified in the Etoys Reference


I don't think that I will add it to the Etoys section of The
Undiscoverable, but will just point to the manual.


If you have ever stumbled over any other aspect of Etoys in this way,
please let me know.

On Thu, January 10, 2013 11:15 am, David Corking wrote:
> R.D. Latimer wrote:
>> I hope this is the correct list for etoys questions...
> Yes. Welcome back!
> You later wrote:
>> No need for help on pen trails anymore.  I found the 'clear pen
>> trails' in the 'pen trails' section does the trick.
> That is great news. (How did you find it?) In the meantime I wrote up
> a fuller answer which I post below in case it helps someone else with
> a similar question.
> I can't reproduce your problem with a 'Text' from the supplies flap.
> (Both buttons work to clear the pen trails.)
> However I tried with a 'Playfield' and that has slightly surprising
> behaviour.
> Unlike most other objects, a playfield has two similar sounding tiles
> in its viewer: 'Playfield clear all pen trails' and 'Playfield clear
> pen trails'. They sound similar but don't do the same job. (Note the
> word 'all'.)
> The first tile, 'Playfield clear all pen trails', clears trails drawn
> in the world, but leaves trails drawn inside the playfield intact.
> (The balloon help and the reference manual say 'Clear all trails in my
> containing playfield'. The world is another playfield.)
> The second tile, 'Playfield clear pen trails', clears only those
> trails drawn inside the playfield, and leaves all other trails intact.
> (The balloon help here is 'Clear all the pen trails in the interior'.)
> (For comparison, 'Car clear all pen trails' will clear all the trails
> in the playfield the car is currently in.)
> I tried this with Etoys 5.0 - so please mention if you notice
> different behaviour on other recent versions of Etoys.
> Have fun! David
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Edward Mokurai
Silent Thunder is my name, and Children are my nation.
The Cosmos is my dwelling place, the Truth my destination.

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