[Squeakland] overlaps over clone does not work

[Scott Wallace]

Hello, Hilaire,

Sorry to disappoint, but "Fish overlaps krill" tests only whether one 
specific object, the Fish, overlaps another specific object, the 
specific krill mentioned.

We still have a strong need for features that allow the kind of 
"group-checking" that you were hoping "overlaps" would provide.

The functionality you propose could perhaps be embodied in a new kind 
of test tile called something like "overlaps any" -- thus,

     Fish overlaps any krill

would be true if the Fish overlapped the explicit object mentioned, 
krill, *or* any of its siblings.

That sounds like a feature worth adding ;-)

Cheers,

  -- Scott


PS:  Regarding the little-known "touchesA" -- this does indeed 
operate on a group basis, but not by class, as you perhaps might have 
expected, but rather the group is defined to be all "sketchMorphs" 
(principally, these are drawings made with the Squeak painting 
system) whose graphic (independent of any rotations) is identical to 
the one mentioned after the touchesA tile.  This is a feature put in 
a long time ago, I think, in support of one particular demo that it 
enabled, but it's not in widespread use, and arguably we need 
something better.  Perhaps the addition of an "overlaps any" would be 
a reasonable start.

If you're into looking at the source code, take a look at the comment 
in method touchesA: in class Player for more details about this 
unusual tile ;-)


At 2:55 PM +0200 10/6/04, Hilaire Fernandes wrote:
>Hello,
>
>I cannot get an expected result with the "overlaps" tile to make
>overlaps test.
>
>I can get it work with one instance of a player 'krill', let's say:
>
>'fish overlaps krill'
>
>however this test does not work with a clone of krill.
>
>I was expecting that the overlaps method was working at a class level
>and not at an instance level. Or maybe there is something I have not
>understand.
>
>Concening the toucheA I did not succeed to use it in test condition.
>
>Is there any coin
>
>--
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