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[Fractint] Re: Fractint Mystery
by Hal Lane 15 Apr '07

15 Apr '07

################################################ Forwarding this bug reported by jackoftradez to the development group. - Hal Lane ######################### # hallane(a)earthlink.net # ######################### ################################################ >Date: Tue, 10 Apr 2007 03:14:32 +0000 >From: jackoftradez(a)comcast.net >Subject: [Fractint] Re: Fractint Mystery >To: fractint(a)mailman.xmission.com >Message-ID: > > >Anyone who has seen my deep zoom viddies has noticed the >occasional jerk frames. I do not know what causes this, but it >seems that fractint reads the PAR file wrong and scrambles the >numbers for some reason. Thus with off-parameters or coordinates >the image(s) are a bit distorted or off center. > >Now, attempting a zoom animation of Muth FOTD 3_15_07 I have >encountered this again, only the error occurs in the magnification >number - the first time I have seen this! I need someone to verify >that I am not hallucinating. Here are PARS for 3 images in the sequence: > > > >'''''''''''''''''''''''''''''''''''''''''''START PAR'''''''''''''''''''' > >782.0000 { ; > reset=2004 type=formula formulafile=allinone.frm >formulaname=mandelbrotbc2 passes=1 > center-mag=-0.63982851388294900/+1.17265143805666000/1.35148269130032e+12 > params=1.5/0/85/0 float=y maxiter=5000 inside=0 periodicity=10 > } > > >783.0000 { ; > reset=2004 type=formula formulafile=allinone.frm >formulaname=mandelbrotbc2 passes=1 > center-mag=-0.63982851388294900/+1.17265143805666000/1.37763961568162e+12 > params=1.5/0/85/0 float=y maxiter=5000 inside=0 periodicity=10 > } > > >784.0000 { ; > reset=2004 type=formula formulafile=allinone.frm >formulaname=mandelbrotbc2 passes=1 > center-mag=-0.63982851388294900/+1.17265143805666000/1.40426842987625e+12 > params=1.5/0/85/0 float=y maxiter=5000 inside=0 periodicity=10 > } > >frm:MandelbrotBC2 { ; by several Fractint users > e=p1, a=imag(p2)+100, p=real(p2)+PI > q=2*PI*floor(p/(2*PI)), r=real(p2)-q > Z=C=Pixel: > Z=log(Z) > IF(imag(Z) > r) > Z=Z+flip(2*PI) > ENDIF > Z=exp(e*(Z+flip(q)))+C > |Z| < a } > > >''''''''''''''''''''''''''''''''END PAR'''''''''''''''''''''''''''''''''''''' > > >You clearly see the mag factors are 1.35e+12, 1.37e+12, and >1.40e+12 respectively. The first and last render correctly, but >the middle one ends up with a mag factor of 6.88e11 ! >Why is this and where does the number come from? It is totally >reproduceable too! > >You dont have to render the entire image (they take awhile). Just >a couple lines then hit TAB key to see the numbers. > >A clue might be that this only occurs in the last third of the >sequence - beyond e12. There are so many messed up frames an >otherwize awesome zoom is not now good for posting! > >Whoever solves the mystery gets a free DVD! > >Cheers > >JoTz > ################################################ -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.0.0/754 - Release Date: 4/9/07 10:59 PM

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Fractint for Windows disk video modes
by Jonathan Osuch 14 Apr '07

14 Apr '07

Rich, Were you aware that with the disk video modes, the tab screen doesn't get cleared? Jonathan

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cvs conversion experiment
by Tim Wegner 14 Apr '07

14 Apr '07

Folks, bear with us, I'm not ready to make these experiments public yet, but in good time we will, maybe sooner rather than later. Let me emphasize that while I have converted CVS to SVN just as an experiment, we're not commiting using SVN yet, OK, I ran cvs2svn on the entire repository. That may not be what we want, but it's a starting point. We're at a revision over 1000 :-) You can access it via a ssh account: svn+ssh://<userid>@fractint.net/home/twegner/fsvn Then I copied it to a second repository that has server access. I made server accounts with the same user ids as the shell accounts. This can be accessed via the web or Tortoise at: http://fractint.net/fsvn You have to login, and while login data is the same as your shell accounts, it's really a separate login. I can turn on the server version for anonymous read-only access. I tried accessing the server based repository using the ssh non- server method (probably a dubious idea, messing up the atomic commit architecture) like this: svn+ssh://<userid>@fractint.net/home/twegner/svn/fsvn Enough for now. Tim

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subversion experiment
by Tim Wegner 12 Apr '07

12 Apr '07

First, I know I could set up a non-server svn repository in my bazooka file system just like we set up CVS, but I'm trying something different. The dreamhost control panel has a tool for installing a subversion repository accessible through Apache. 1. I created a subversion repository called "hello world" with subdirectory hw01. I requested public read access. There is a facility for users that I can manage. This has nothing to do with shell account users, but I made an account for myself. 2. I looked in my directory using my shell account, and found a directory called svn/hw01. Inside this directory was a set of files making up a svn repository that looks very similar, if not exactly the same, as any subversion repository. The files owner is the apache user, and the group is the group name I was was given when I created the account. 3. I created a directory and wrote the familiar hello world program. Then I executed the command: svn import . http://www.fractint.net/hw01 Voila! A publically visible repository with my hello world program accessible at http://www.fractint.net/hw01 4. I installed the subversion tortoise on my PC. Fortunately it can co-exist with the CVS tortoise. I checked out the repository. This worked fine, I was not prompted for a password. 5. I locally edited hello.c and committed. This time I was prompted for username/password 6. The web interface now shows the edited file. Anyone can check out files using any subversion client or the web interface. I can create accounts for people to give them commit permission. Or if we don't want public access, it can be limited to the accounts. One possibly very big problem - I don't know how to import a whole repository with versions. I have no control over the apache ownership of files, so I can't just copy (nor do I think it's appropriate to be directly manipulating the subversion data base anyway). If we convert the existing CVS repository, I don't know how to give the files the right ownership. I'm looking to see if there's a subversion command to bring in a whole repository with versions. Obviously I CAN import all the files without the history. None of this is a show stopper since ssh access method we are using now will still work with subversion; however the server access looks better in several significant ways: better security, better anonymous read-only access. Tim

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transition to C++ as "a better C"
by Richard 12 Apr '07

12 Apr '07

Working in FractInt really makes me miss objects. C++ is backwards compatible with C as long as you avoid variables called 'new' and so-on. I've already refactored the identifiers that conflict with C++ keywords not present in C. So what I'm thinking is that I'll just take all the *.c files on the branch and save them as *.cpp. Then address any compile errors or warnings that might result. It will still be a gigantic 1990-style C program, but now when we add new code we can add it as objects. Existing code can be incrementally refactored(*) into objects. This is the approach I intend to take on the source. It won't happen overnight. But slowly, gradually, the code will move to objects and interfaces with locally encapsulated state that will allow the engine to be repurposed in many, many ways... I don't care so much if the DOS UI dies, but I want to see the parameter file stuff, the formula stuff and the fractal types live on (and probably some other stuff too, but I'm not trying to make an exhaustive list here). Any thoughts are welcome... (*) I should be specific with the word "refactor" here as it can have just the English language intuitive meaning of re+factor, but in software engineering it means something specific. A refactoring is a change to the structure of the code that preserves the behavior of the code to all callers (implementation may change, but behavior is preserved). For examples of specific code transformations that are considered refactorings, take a look at <http://www.refactoring.com/> and browse the "Catalog" link at the top of the page. So how do you know if the behavior has been preserved across the change? Unit tests. That might sound like a bunch of extra work, but reading the book "Working Effectively with Legacy Code" by Michael Feathers has convinced me it can be done to an existing body of code like FractInt in an incremental fashion. <http://www.amazon.com/Working-Effectively-Legacy-Robert-Martin/dp/013117705…> <http://www.objectmentor.com/resources/books.html> -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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VS.NET 2005 / VC++ 2005 Express
by Richard 02 Apr '07

02 Apr '07

Since the solution and project files differ between 2003 and 2005 and I've just switched to 2005, I've added alternate solution/projects for 2005. Just load fractint.2005.sln for 2005 and fractint.sln for 2003. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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Mouse support in Fractint for Windows
by Jonathan Osuch 31 Mar '07

31 Mar '07

Rich, Take a look at Frame.c. The mouse code works much better now. It does have a problem with not moving far enough, but it at least moves in the right directions. Jonathan

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Paul online yet?
by Richard 29 Mar '07

29 Mar '07

Paul, did you get some sort of system for looking at the code yet? -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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Out of memory errors
by Jonathan Osuch 28 Mar '07

28 Mar '07

Rich, At the default image, pressing either o (for orbits) or the space bar gives an out of memory error in editpal.c. Which, makes no sense, since we shouldn't be anywhere near editpal.c. Also, I tried loading an image (using the 3 key) to make a 3-d image and ended up stuck in a loop. Jonathan

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Re: Xfractint version in realdos.c
by Richard 26 Mar '07

26 Mar '07

In article <1174855092.3938.6.camel(a)linux.site>, Jonathan Osuch <osuchj(a)avalon.net> writes: > While browsing through the Fractint for Windows source, I noticed that > you have the Xfractint version as 3.04. I don't recall the exact date, > but we have had the same versions numbers on Xfractint and Fractint for > many years now. If there are two places where the version is being tracked, the second one should just be eliminated. With this branch, the Xfractint code is more like the Windows code than ever before. Most, if not all, of the #ifdef XFRACT stuff should go away. But it won't go away until I've finished the X11 driver, which won't be until later. At this point the branch compile xfractint, but it won't do anything useful. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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