Subject:
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Re: Line Thickness and Antialiasing in LdGLite 0.7.3
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sun, 31 Dec 2000 01:41:10 GMT
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Viewed:
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2198 times
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Don Heyse wrote...
> In lugnet.cad.dev, Lars C. Hassing writes:
> > In lugnet.cad.dev, Don Heyse writes:
> > > In lugnet.cad.dev, Lars C. Hassing writes:
> > >
> > > [snip] (a bunch of stuff about
> > >
> > > > I really would like to find the cause of the problem, because L3P relies on the
> > > > same routines, and it does work for L3P.
> > > > All filenames are internally made lowercase (FixDatName), so I don't have to worry
> > > > about any following compares.
> > > > Which platform(s) had the problem?
> > >
> > > It was on a linux system where I had copied all the DAT files from a
> > > smbmounted Windows filesystem and somehow ended up with them all in UPPERCASE.
> > > This is probably not a normal setup, but it happened to me and I'm too
> > > lazy to write a script file to fix it. Anyhow I tried to allow for this
> > > with the environment variable LDRAWDIRCASE=UPPERCASE and some code in
> > > platform.c but I was thwarted by strcmp() to hardcoded lowercase special
> > > filenames in L3Input.cpp. Using stricmp() fixes this and is the approach I
> > > used with the LdLite parser. I can't think of any reason not to use stricmp
> >
> > stricmp is slower, though the difference is most likely immeasurable in the big picture.
> >
> > No, it is more a matter of principle, to know what you are dealing with,
> > to be in control of of your data - in stead of not really knowing whether
> > it is necessary or not.
>
> OK I confess, I took the cheap and easy fix rather than digging deeper
> to find the root of the problem. After further consideration I suppose
> the correct solution would be to run FixDatName() on all the hardcoded
> lowercase filenames when the program is initialized.
Ah, I think I understand now...
You require all DAT files in Linux to be in uppercase?
If you let FixDatName convert to lower case (like I do),
you could modify OpenDatFile to use upper case,
(if that's what you require) and simple strcmp will work in L3Input.cpp.
My approach is like this:
Line type 1 filenames are in "optional" case, i.e people use e.g.
4-4cyli.dat, 4-4CYLI.DAT, 4-4cyli.DAT or 4-4CYLI.dat.
Internally, FixDatName sees to that it is known as 4-4cyli.dat,
so I can use the simple strcmp.
As you cannot rely on the case of the filename in line type 1,
you have to do (on Linux) the case-gymnastics when you later
are going to load the file.
I have already prepared L3P for Linux by writing an OpenDatFile,
which will find e.g. 4-4cyli.dat no matter whether the Linux file is named
4-4cyli.dat, 4-4CYLI.DAT, 4-4cyli.DAT or 4-4CYLI.dat.
(On DOS/Windows you can simply load 4-4cyli.dat and the OS will find it)
I wrote OpenDatFile long time ago on a Solaris Unix system,
but will soon put it into L3Input.cpp, when I get Linux (re)installed.
I don't have it with me, and I can't really remember how thorough
I tested it, but I'll of course make sure it works on Linux.
/Lars
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Message is in Reply To:
 | | Re: Line Thickness and Antialiasing in LdGLite 0.7.3
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| (...) OK I confess, I took the cheap and easy fix rather than digging deeper to find the root of the problem. After further consideration I suppose the correct solution would be to run FixDatName() on all the hardcoded lowercase filenames when the (...) (26 years ago, 30-Dec-00, to lugnet.cad.dev)
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