January 2004 - Fractdev - mailman.xmission.com

Patch 6
by Jonathan Osuch 03 Jul '05

03 Jul '05

Tim, I'm going to try to wrap up patch 6 this week. So far, this is what I have: Fixed FPUcplxdiv and FPUcplxlog routines in fpu087.c to match assembler code. Fixed it so spaces are recognized in PAR entry names. Fixed evolver parameter entry. Fixed hypercomplex fractal type to turn off symmetry when a cj parameter is used. Fixed the plasma type to show the value of the parameter that is actually used in the image generation. Fixed the plasma type so that a parameter file uses the included colors instead of the default colors. Revised the plasma type prompt to reflect the values that could actually be used. Fixed inside=atan and outside=atan to use the full color palette instead of limiting to 180 colors. Modified the resume code to remove the Xfractint specific sections since they are no longer needed. I still need to move all this over to DOS and make sure nothing is broken. There are other fixes I would like to include, but haven't done them yet. Jonathan

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Floating point error in LambdaFn exp
by David Burnett 04 Feb '04

04 Feb '04

Hi, It seems there has been a bug in LambdaexponentFractal() for a long time. This shows up in cet16109 (the example params for LambdaFn from the Fractal Creations book) This works in integer, but when you select floating point, it goes bizzaro, and hence doesn't work in 20.3. From my observations, FLOATEXPBAILOUT() doesn't work - it should be FLOATHTRIGBAILOUT I tried to compile the changes using a freshly downloaded JBuilderX, but all I got was a lot of obscure error messages., which reminds me of why I work in java nowadays. If someone feels like checking it out...... I have included the params below, so you don't have to go looking for it. I will get around to figuring out how to compile fractint sometime, but as it doesn't run with my parhelia card, it's low on the list. David cet16109 { reset=2000 type=lambdafn function=exp corners=-5.711838/-0.009338379/0.1610565/4.436798 params=2/4 inside=0 potential=255/511/0 cyclerange=2/255 colors=0006OL3LI0IE<9>UfhXik_kn<3>kuz<9>IMaFI_CFX<3>00N<9>bWVfZVjaW<3>zn\ Z<9>`KFZHDWEB<3>M13<2>S8BVBEXEGZHJ`JM<3>iUYkX_n_bpaerdhtgk<8>mUTlSRkRP<3\ >gKGfIDdHD<7>N76L65J54<3>A00<9>TY_VacXdg<3>cru<9>FL`DHZAEX<3>00P<3>KSePY\ iUdmZkqcru<9>FbdDabA_`<3>0UU<3>OeZUh`Zja<3>vvf<15>xaRx`Qx_P<2>xWMyUKxXM<\ 3>phUnkWlnY<3>dze<6>N`OLXLIUI<3>8F8<9>UheWkiYnl<3>fzz<12>9RO }

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Fractint version 20.3
by Jonathan Osuch 20 Jan '04

20 Jan '04

Fractint version 20.3, both DOS and Linux, is now available at www.fractint.org. Note that this is the float only version. What's new: Incremented the version number to accommodate backwards compatibility for the inside=atan and outside=atan options. Fixed inside=atan and outside=atan to use the full color palette instead of limiting to 180 colors. Added Charlie Chernohorsky's virtual screen zoombox fix. Added Gerald Dobiasovsky's fixes for the demo key files needed because of menu prompt changes and pan/zoom size changes. Fixed evolver parameter entry. Fixed hypercomplex fractal type to turn off symmetry when a cj parameter is used. Fixed the plasma type to show the value of the parameter that is actually used in the image generation. Fixed the plasma type so that a parameter file uses the colors included in the parameter entry instead of the default colors. Revised the plasma type prompt to reflect the values that can actually be used. Increased the Lsystem line length from 160 characters to 255 characters. Fixed the browser so that it recognized the fractal type stored in images. Fixed the Xfractint FPUcplxdiv and FPUcplxlog routines in fpu087.c to match the Fractint assembler code. Modified the Xfractint resume code to remove the Xfractint specific sections since they are no longer needed (gcc macros match MSC macros). I took out the fix for spaces in parameter entry names because it broke batch files. Fixed that, but then formula names were broke. So I gave up. Still thinking about it, however. Jonathan

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No bailout in bjax formula?
by Edwin 18 Jan '04

18 Jan '04

Hi, Looking at the fractint.frm which comes with xfractint 3.10, the "bjax" formula is: Bjax {; z=c=2/pixel: z =(1/((z^(real(p1)))*(c^(real(p2))))*c) + c } This looks like it's missing a bailout condition. Does fractint supply a default bailout function if the user doesn't give one? When I render it I get a blank screen. However even if I add |z| < 4 at the end, it still doesn't display anything, so I'm a bit confused. Regards, -- Edwin

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Zoom box movement in autokey files
by Gerald K. Dobiasovsky 15 Jan '04

15 Jan '04

Hi... Not that it matters much, since fractint's autokey feature doesn't seem to be used by many: When playing an autokey file that was created for version 19.x and earlier, panning the zoom box now moves it too far, resulting in a much different image than was intended. This can be checked using demo.bat, demo.par and basic.key from the autokey files created for version 19.x and still part of the fractint distribution, choosing "Basic commands demo". (Not to forget: One has to change line 25 in basic.key from "DOWN * 2" to "DOWN * 4" to adapt it to the additional two prompts on the <x> screen introduced in, I think, fractint 20.1.) Regards, Gerald

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Preliminary patch 20.3.00
by Jonathan Osuch 11 Jan '04

11 Jan '04

Tim, I put a preliminary patch for the DOS float only 20.3.00 in the fractint folder. Please take a look at it if you get the chance. I'll try to get the Xfractint float only ready tomorrow. Although I can ftp to mandy, I don't seem to have anything that will let me SSH to it. What do you currently use? Jonathan

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