[cad-linux] Re: Design methodology for an open geometric data management standard
- From: Bruno Postle <bruno@xxxxxxxxxx>
- To: CAD Linux list <cad-linux@xxxxxxxxxxxxx>
- Date: Sun, 7 Sep 2003 21:18:11 +0100
On Sun 07-Sep-2003 at 09:47:41PM +0200, Janek Kozicki wrote:
>
> > > Any items not listed in a layer table would simply not have
> > > an assigned layer.
>
> one thing I have doubts about:
>
> one object has its name placed in two places. - the file
> describing that object, and the table of layers. I don't like it.
I had doubts about this and didn't implement it. Keeping attributes
in a separate table is just usual database normalisation - The
question is really this:
If an object is copied/moved/linked from one drawing to another,
does it take it's attributes with it?
I would say that a layer is a 'place' rather than a fundamental
property of an object and shouldn't be carried around - Unlike the
radius of a circle for example - The radius should by 'sticky'.
Things like 'colour' or 'material' are less obvious - I suppose any
file format should be flexible about such attributes.
> What if the data gets unsynchronised? Of course, there could be
> made a workaround as - assigning 'layer 0' to objects without a
> layer,
As I understand it, that is what layer 0 represents in AutoCAD (My
drawings got a lot simpler and I wasted much less time when I
started putting everything on layer 0 :-)
--
Bruno
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