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From: papa@uscvax.UUCP (Marco Papa)
Newsgroups: net.micro.amiga
Subject: Re: Mandelbrot Sets, 3.02, etc.
Message-ID: <259@uscvax.UUCP>
Date: Thu, 16-Jan-86 13:36:00 EST
Article-I.D.: uscvax.259
Posted: Thu Jan 16 13:36:00 1986
Date-Received: Sun, 19-Jan-86 04:33:38 EST
References: <969@caip.RUTGERS.EDU>
Organization: CS&CE Depts, U.S.C., Los Angeles, CA
Lines: 73

> Now for the problems...
> 
> I have been having the same problems as Bernie Cosell <cosell@BBN-PROPHET.ARPA>.
> The Lattice bug with consecutive floating point assignments was mentioned
> in Bob P's fast floating point demonstration program, but I never really
> realized what he meant until now.  I wonder if 3.03 has this problem?
> Also, I had the same problems with enumerated data types in workbench.h
> and performed almost exactly the same surgery.  Everything seems to work
> OK now, except that the computer crashes immediately after writing the
> screen in IFF format.  It doesn't close the files, but they may be recovered
> by copying them to another file.  Finally, ever since Mandelbrot 2.00, I
> have been unable to draw a picture in INTERLACED mode.  Looking thru the
> code, I noticed the distinct absense of the line:
> 
> if (color_mode & INTERLACE_MODE) {
>    ns.Height = 400;
>    ns.ViewModes |= INTERLACE;
>  (^^^^^ this line missing ^^^^^)
> }
> 
> in open_winds() in mand3.c.  Apparently this was dropped in my original
> transmission, and was never replaced.
...
>       Your fractal and mine,
>            Robert French
> 

I just applied the surgery suggested by Bernie Cosell and Robert French and 
got the thing working (I mean the program compiles, Presets() works, and
Interlace mode works also). But as Robert suggested the Save function does 
not work at all. The behavior on my machine when invoking Save (for a 320x200
image) is as follows:

1. the disk starts spinning and spins for about 20 minutes !!!

2. sometimes I get back the CLI. sometimes the machine locks and I have to 
   reboot.

3. When I look at the directory two files are there:
   MandPic.xxxx.x and MandPic.xxxx.x.info

  (the x's are numbers depending on the Mandelbrot window, I think).

4. Both files are "Empty". I tried, as suggested by Robert, to copy the files
   to other files. The first one got copied in about 15 min (and ended up 
   being ~40K, and the second one (the .info file) ended up being more than
   100K!!!  I tried to load them back into the Mandelbrot program, but with
   no success.

Now, I would really suggest that anybody that submits a program to USENET or
other public networks, first checks whether his version will run properly with
the version of the compiler that everybody has (that is, 3.02).  I have been 
waiting for the documentation and software from Commodore for 3 months now,
and got my Lattice C 3.02 disks by showing my developer acceptance letter 
from Commodore. Naturally I still have no documentation, and have bad
feelings about it when I consider that its has been 3 months since I saw the
message from somebody at CA saying that the 1.1 manuals were at the printers,
and a week ago I see from another guy at CA that "maybe" the 1.1 manuals are
at the printers.  I know of no dealer in the LA area that has the Lattice C 
version 3.03, and all developers that I know also have 3.02, and have sent
out their update letters long ago and received nothing.

By the way, I love the Mandelbrot program. It is full of great examples on
how to use Intuition, the workbench, the various graphics modes, gadgets,
anything one can think of.  Thanks to Robert and RJ Mical for a great job.

Marco Papa
USC - Computer Science Dept.

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