[cad-linux] Re: the parametric project
- From: "Lee Harding" <lee.harding@xxxxxxxxxxxx>
- To: <cad-linux@xxxxxxxxxxxxx>
- Date: Wed, 21 May 2003 14:30:30 -0700
An interesting (simple) case to think about is how the corners of an
axis-aligned rectangle relate to one another -- are those directed or
undirected relationships? And, how would you implement making the edge
between points movable (e.g. dragging one of the four lines of the
rectangle) -- can you move more than one point at a time, and what
happens when conflicts result?=20
-----Original Message-----
From: Lee Harding=20
Sent: Wednesday, May 21, 2003 10:23 AM
To: cad-linux@xxxxxxxxxxxxx
Subject: [cad-linux] Re: the parametric project
If you're going to be managing networks of dependencies, take a look at
the BGL (Boost Graph Library). Translating the concepts therein to a
_protocol_ would be a great contribution to a distributed parametric
system.
-----Original Message-----
From: Roland Krause [mailto:rokrau@xxxxxxxxx]=3D20
Sent: Wednesday, May 21, 2003 9:30 AM
To: cad-linux@xxxxxxxxxxxxx
Subject: [cad-linux] Re: the parametric project
Eric,
you are most welcome to use the kosmos site for RFC's, design documents
whatever you see fit.=3D20
The thread last week was intense and then fortunately lost some
steam.=3D20
I have started to think about parametric geometry. This is *not* an
easy task but I believe to have a first simple prototype going.=3D20
It is a model where geometrical entities are considered dependencies
and they are defined by relations to one other geometrical entities. As
an example a point is defined through it's relation to another =
point.=3D20
P1 <--- P2=3D20
P2 relates to P1, if P1 moves so does P2. Very simple but works. The
code for this is in the latest upload on kosmos.sf.net.=3D20
Roland
--- Eric Wilhelm <ewilhelm@xxxxxxxxxxxxx> wrote:
>=3D20
> I'm writing code recently and with all of the geometry handling, I
> started=3D20
> thinking that it would be great to have an editing environment
which=3D20
> supported parametric objects. I'd like to be able to tie a sketch to
> a loop=3D20
> structure and have it follow the thing around as the program changes.
> It=3D20
> would also be great for making little notes which were not really
> comments or=3D20
> would be better explained diagrammatically.
>=3D20
> So, maybe building the Perl interpreter into an editor and linking it
> to some=3D20
> kind of database would be the way to go. But how else could you use
> such a=3D20
> thing? Maybe when documenting a project, you could tie a sentence to
> an=3D20
> object or a part? Or you might even find it useful to have a
> parametric=3D20
> number stated in your report. It seems likely that I'm getting
> carried away,=3D20
> but I continually see the possibilities which exist with a
> well-designed=3D20
> open-source system.
>=3D20
> Too bad I'm swamped for the next couple of weeks or I could be
> finishing that=3D20
> proposal.
>=3D20
> The thread on a database-cad system seems to have lost some of its
> steam. I=3D20
> imagine others have also been busy. I'd like to get something like
> an RFC=3D20
> drafted and try to get some programmers involved in this, especially
> those=3D20
> who have been working on cad software. If anyone wants to help with
> the RFC,=3D20
> we could probably use the sourceforge page for kosmos as a
> collaboration=3D20
> site.
>=3D20
> Anyone ever get a WIKI started?
>=3D20
> --Eric
>=3D20
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