[gl2ps] PGF backend and new code structure

[Fabian Wenzel]

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Hi there!

Today I finished working on the PGF backend. Unfortunately, pgf is not
as complete as I expected: Including images and color shading is not
possible, so I stopped also working on transparency. For simple
drawings, it might be useful though.

Also, I noticed that the code structure of gl2ps.c could be improved
(long file with many functions), so (I hope you won't kill me) I did the
following:

1. Each output format (=backend) is located in an own file
2. Each backend defines a structure "gl2psBackend" encapsulating its
functionality completely (kind of object oriented). They are all
referenced in gl2ps.c (around line 119...)
3. There are two more functions "char *gl2psGetFileExtension(GLint
format)" and "char *gl2psGetDescription(GLint format)" for each backend.
I think it makes sense as an application does not have to find the right
file suffix on its own - there is no reason for it. gl2psTest also has
been adjusted to the changes above, so no more
(format==GL2PS_EPS)?"eps":"pdf"
4. The while bunch of "switch(gl2ps->format)" could be removed in gl2ps.c

I think that maintainable code is more important than a minimum number
of source files.

Finally, I added autotools-support for building a lib. Some changes will
be necessary for win32 and MacOSX (for dependencies to OpenGL).

In order not to spoil this list with source code, I send the new archive
to Christophe as proposal.

There is another issue that is better written in an own posting.

Cheers,

	Fabian


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