[etoys-dev] x-y plane questions

[Ricardo Moran]

On Mon, Mar 19, 2012 at 3:38 AM, Scott Wallace <scott.wallace at squeakland.org
> wrote:

> On Mar 18, 2012, at 5:52 PM, Ricardo Moran wrote:
>
> > I made a couple of changes to the number lines that I would like you to
> check:
>
> I've looked quickly tonight and hope to have more time tomorrow, but a
> quick reply for now, hoping others will chime in soon.


Great, thanks!


>
> > * I added two tiles: "transform to pixel" and "transform to graph" (the
> names could be improved but I didn't know how to name them). This tiles
> take a number as a parameter and return it transformed to the other
> coordinate system. It's a general way of using the number lines and I think
> it could be very useful.
>
> This certainly expands the bounds of what can be done with number-lines.
>  Cool example too :)
>

Yes, I wanted to do it since one of the first versions of the number lines,
but it wasn't until I attempted to implement the "ask" tile that I learned
how to make these "function" tiles, which are not well supported IMHO.


>
> Since "transform to pixel" provides a transformation from a
> number-line-based coordinate to a coordinate in the cartesian system of the
> surrounding Playfield, perhaps it could be called "transform to playfield"?
>  Not sure if that's much better, if at all, however.
>

If the "transform to graph" is an acceptable name, then maybe we could use
"transform from graph" to represent the opposite operation (which is a
little better than "transform to pixel" that doesn't mean anything). But
naming is a very difficult task and not being a native english speaker
doesn't help much...


> If we adopt these new guys, we'll need to provide balloon help of course...
>

Yes, of course. Being a lazy person I almost never write them and then I
put my native language as an excuse :)


>
> > * I changed "x on graph" and "y on graph" to take into account the
> object's rotation center. However, I could have messed up with this and it
> could have undesired side effects, so testing would be needed.
>
> Oh, good idea!  Thank you!
>
> Good stuff!  The irrepressible Richo - what an asset to the community!
>

:)

Cheers,
Richo


>
>
>  -- Scott
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