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

In working on my Fraction A Day project I built a "Fraction Cutter"

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 ;)

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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In working on my Fraction A Day project I built a "Fraction Cutter"

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 ;)

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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http://lists.squeakland.org/mailman/listinfo/squeakland

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.