[Cuis] [Ann] Cuis 4.1 is released

[Juan Vuletich]

Chris Muller wrote:
>> Cuis 4.1 is available at http://www.jvuletich.org/Cuis/Index.html . Biggest
>> news is in the Morph hierarchy. Ivars 'bounds' and 'fullBounds' are gone!
>>     
>
> Wow!  To get rid of those two is amazing; how did you do it?!
>
> Oh, but wouldn't you need at least one of them?  How to know a Morphs
> extent now?
>   

Hi Chris,

I removed them with a lot of patience. Doing so low level surgery on the 
live system is quite risky!

The idea is that location (position, angle, scale, and/or whatever 
specification of how a Morph is placed in its owner) should be 
completely separated from attributes such as extent. Any morph needs a 
location. But not all morphs need an extent. For example, a polyline, or 
Bezier path would be specified by corners or control points. Not by 
extent. In addition, the location of a morph is a rather accidental 
attribute. Moving an object around is not modifying it. Maybe two morphs 
with different location can still answer true to #=. But changing size 
is indeed a modification. Two morphs with different extent (or control 
points or whatever specifies their shape) are indeed different (i.e. 
they answer false to #=).

Right now, Cuis doesn't include examples of morphs without extent 
(except for Morph itself), as the only morphs that are present are those 
needed to support the Smalltalk tools. Because of this, the only 
subclass of Morph is RectangleLikeMorph, that happens to use an extent 
ivar with the size.

But in Morphic 3, most interesting morphs are not specified by an 
extent, but by some set of control points.

BTW, instances of Morph are not resizeable (I had to add an update to 
github to avoid a walkback! :) ).

Cheers,
Juan Vuletich