[squeakland] Fraction Cutter - Amazing what you can do with a few scripting tiles

mokurai at earthtreasury.org mokurai at earthtreasury.org
Sun Jun 26 00:07:12 EDT 2011


On Wed, June 22, 2011 2:26 am, Steve Thomas wrote:
> In working on my Fraction A
> Day<http://mrstevesscience.blogspot.com/search/label/Fraction%20A%20Day>
> project
> I built a "Fraction
> Cutter<http://www.squeakland.org/showcase/project.jsp?id=11020>
> "
>
> I was able to build this with just 11 scripting tiles in Etoys (could have
> got it down to 7, but went for readability).  The first page lets you make
> only 1 cut, the second lets you make multiple cuts. I had to put a
> playfield
> on top of the "unit" (aka rectangle, which is in a gridded playfield) so
> that I could allow you to "clear the cuts" by simply using the Playfields
> "remove all" tile from the collections category, without removing my unit
> and having to put it back each time.
>
> Next I am thinking about using polygons as my "units" so I can visually
> show
> the cut by duplicating the polygon and modifying the vertices to points
> where they intersect the cut. Then I will "animate the cut" by moving the
> polygon's apart. This should scale to multiple cuts without code changes
> (using the Playfield's "tell all contents" tile from the scripting
> category). Well at least I think it should testing and the mandatory
> debugging that occurs anytime I write code will tell ;)

Nice. I assume that we can cut pies, and move the pieces slightly apart.
Also that it would be easy to color pie slices for teaching arithmetic.
What is N÷2/3? Cut N pies in thirds and color pairs of slices, then count
the pairs. If there is one slice left over, discuss.

> Here is a Etoys Minute showing it in action.
>
> The other amazing thing is that this Etoys Minute is actually less than a
> minute ;)
>
> Stephen
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-- 
Edward Mokurai
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&#1580;) Cherlin
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The Cosmos is my dwelling place, the Truth my destination.
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