[etoys-dev] Future Release feature: A slide/glide tile

[karl ramberg]

On Tue, Feb 28, 2012 at 1:33 PM, Steve Thomas <sthomas1 at gosargon.com> wrote:

> On Tue, Feb 28, 2012 at 9:01 AM, Bert Freudenberg <bert at freudenbergs.de>wrote:
>
>> On 28.02.2012, at 08:09, Steve Thomas wrote:
>>
>> > On Mon, Feb 27, 2012 at 3:10 PM, Bert Freudenberg <bert at freudenbergs.de>
>> wrote:
>> >
>> >> The execution models of Etoys and Scratch are fundamentally different.
>> In Etoys, all tiles in a script are executed in the same time step. You
>> cannot have an individual tile take time. That's why there is no "wait"
>> tile. That's why you can't do animation with the "repeat" tile. Etc.
>> >> Unless/until someone adds that capability, you can't have a slide tile
>> either. (The single-stepping mechanism might be a step (pun intended) in
>> that direction)
>> >
>> > Okay, eventually I will get my head around this execution model (then
>> I'll try tackling the one for Kedama ;)  But, I think I get your point and
>> I was not asking for a wait tile (well perhaps I don't get it, but I plunge
>> on blissfully ignorant of my own ignorance...)
>>
>> Your proposed glide tile would be equivalent to a wait tile, in that it
>> takes time. The tile after the glide tile in the same script would only be
>> executed after the glide tile finishes. That's how this kind of tiles work
>> in Scratch. I agree it's convenient. You can easily script "stories" (glide
>> there in 1 sec, say something for 1 sec, come back in 1 sec) or play
>> melodies (note C for 0.5 secs, then a D for 0.5 s etc). In Etoys you don't
>> "script" objects from the outside (do this, then that, then that) as much
>> as provide "behavior" for them (in any given situation, here's what you do).
>>
>> Or did I misunderstand your proposal?
>>
> Correct I do not expect the script to "wait" mid execution, until the
> glide completes, the glide tile is more like a start tile (in fact thats
> what I used in my prototype).
> Providing kids a method to synchronize events is a whole separate request,
> but I haven't figured out a good way to do that yet.
>

There was some work done to make the ScorePlayerMorph work as a playback
trigger/ sequencer that would work like that.
Skeleton is also interesting to bring in as a tool to do in between
calculation over time. Both in animation and general programming.

Karl


> So I took the project I created (attached to SQ-1021<http://tracker.squeakland.org/browse/SQ-1021>) and
> added a tile to change the color of a Rectangle after my glide tiles.
> [image: Inline image 1]
> oneGlide and twoGlide basically call a script to set my GlidePlayers
> variables (Player to glide, target value and #secs), then makes a copy of
> itself and execute the copies script to "glide".
>
> When executed, the gliding starts and the Rectangle changes color in the
> same cycle/step.
>
> Stephen
>
>
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