[self-interest] text and gui
Jecel Assumpcao Jr
jecel at merlintec.com
Mon Mar 15 19:21:23 UTC 2004
On Saturday 13 March 2004 15:12, Albertina Lourenci wrote:
> Is the main difference between syntax for literal and graphical
> objects that the latter is interactive?
The main difference is that, in existing systems, they are used in
different places. The graphical object normally (but not always) is
interactive while we don't think of the textual syntax as such.
Let us imagine we want to have architectural objects in a Self-like
language. One such object is a wall, and we could invent a special
syntax for it so we could write
to describe a wall with the standard height and width which starts at
coordinates x=0.5 and y=0.0 and then passes through three intermediate
points before ending at x=7.0 and y=6.5.
Instead of doing this, we could define the '===' message for points and
walls in regular Self and write
w1: (0.5 at 0)===(0 at 0)===(0 at 7)===(7 at 7)===(7 at 6.5)
using only the literal syntax for numbers and the '@' and '===' messages
to build the same wall object as in the previous example. The problem
with this is that it takes a little while to build this wall from the
10 numbers and so we don't want to do this every time a popular method
To show a graphical version of this same wall object I would have to
attach a picture to this email, so I will let you just imagine we did
it with the sketchMorph we created for your thesis. You can change the
wall after it was created since the sketchMorph is a graphical editor,
but you can also edit the text for the two version of the example I
gave above. The first, of course, can be done while the program is
running while the latter while the program is being created. That makes
a difference for languages like C, but not for Self.
Even though the three versions of the wall object are equivalent in
theory, in practice it is more fun to deal with the graphical version.
> I put forward clearly in my papers that the software architecture
> is the place of discourse and communication.
I was hoping for a simple and concrete example like I gave above.
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