Subject:
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Re: LDLite and LDS (Was: Call for GUI part editor)
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 19 Apr 2006 01:04:10 GMT
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Viewed:
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4165 times
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In lugnet.cad, Tore Eriksson wrote:
> In lugnet.cad, Steve Bliss wrote:
> > I don't know if this helps, but we already have language to support this
> > concept. The LDLite language extensions support the definition of named points
> > and matrices (and colors, but that's not so useful in this context). In LDLite
> > code, you can create a file like:
> >
> > 0 POINT A1 10 0 10
> > 0 POINT B2 -10 -10 -10
> > 0 POINT C3 0 -10 0
> > 0 POINT D4 10 -10 10
> > 3 1 A1 B2 C3
> > 3 2 B2 C3 D4
>
> I had no idea of that. How long has this been an LDLite feature?
Since a very long time; LDLite 1.6 supported it, and it wasn't the first version
to do so. My LDLite 1.6 files are dated March, 1999.
The LDLite meta-commands are very useful -- I used them when I modeled the
soccer ball, way back when.
> It reminds at
> least me of LDS code. The same thing in LDS would look like this:
> P1 10 0 10
> P2 -10 -10 -10
> P3 0 -10 0
> P4 10 -10 10
> 3 1 P1 P2 P3
> 3 2 P2 P3 P4
>
> Is it possible to let, say C3's and D4's y values follow B2? Like, in LDS, you
> can change the code to:
> P2 -10 -10 -10
> P3 0 y2 0
> P4 10 y2 10
> and you only have to edit the y value of P2, then y3 and y4 will also follow. If
> so, that would be really handy.
No, you can't do that with the LDLite statements -- each named point is atomic
(the component values can't be accessed), and there's no expression language --
the actual value of a named point is really just a text string.
Not to say it would be a big stretch to define a syntax like B2.y, to access the
y component of B2. But it's not part of the existing definition.
> > Even if the user were not aware of the point-names, I could see this format
> > being useful for programs that use point-lists.
> >
> > It also typically results in smaller files than straight DAT code.
>
> But not as small as the corresponding LDS code. :)
True. But the LDLite code has the advantage of having a straightforward
translation to standard DAT code.
Steve
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Message is in Reply To:
 | | LDLite and LDS (Was: Call for GUI part editor)
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| (...) I had no idea of that. How long has this been an LDLite feature? It reminds at least me of LDS code. The same thing in LDS would look like this: P1 10 0 10 P2 -10 -10 -10 P3 0 -10 0 P4 10 -10 10 3 1 P1 P2 P3 3 2 P2 P3 P4 Is it possible to let, (...) (18 years ago, 18-Apr-06, to lugnet.cad)
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