A few random comments from an eToy newbie
ned at bike-nomad.com
Mon Apr 7 19:20:00 UTC 2003
On Monday 07 April 2003 11:13 am, Alan Kay wrote:
> There are no nil variables, all variables have some concrete object
> in them, and there is a rudimentary type system (which needs to be
> done better).
But this is inconsistent and confusing from a user point of view.
* Make a new Holder. You don't see anything in it. Its cursor is at 1.
* Then run a script that does:
Holder includeAtEnd Holder's firstElement
Now you see a dot in it, but its cursor is still at 1. From a
programmer/scripter point of view, the "before" and "after" states
are the same. However, the Holder *looks and acts* different: there
is now a dot in it that can be viewed and grabbed, while before there
> SketchMorphs shouldn't ignore the grid (and they don't on my
> version of Squeak). What's going on here?
Grab a Playfield from the flaps. Set its grid to something big
(perhaps 30 or so). Make a SketchMorph. Drop the SketchMorph on this
Playfield. It doesn't snap to anything. However, if you use the brown
halo handle, it does snap to the grid. As does the yellow handle.
> Also, I think that one of
> the original conventions was supposed to be "center of object on
> grid intersection". Maybe Scott has some comments.
That sounds like a good idea, though it's inconsistent with the
behavior of the PolygonMorph (which snaps its *origin* to the grid
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