The FBcomplex lib from FreeBasic

[jack]

RobbeK
I experimented with your fractal program a little, I copied fbcomplex.bas and fbcomplex.bi to fbcomplex-s.bas and fbcomplex-s.bi and edited them to use single instead of double
then compiled using: fbc -c -gen gcc -Wc -Ofast fbcomplex-s.bas
and compiled your fractal program using the same switches, it's roughly twice as fast, but there is a visible dot in the yellow disk


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[jack]

the included library has issues, when using factor 5 it's distortion is severe.

[RobbeK]

Hi Jack,

a lot of thanks

don't worry about that black hole on 0,0 -- it should be there , it's a (near) by zero division ...

"distortion is severe"  -- maybe you have to change the loop escape mechanism  (I wrote this with double floats in mind)
(residu > 0.0000001)  replace->   (residu > 0.00001).  it's possible with such a small value , the single floats become "bouncing"

The idea of scaling the coefficients is not so bright , I'll include a coordinate system scaling/transformation. 

best, Rob

[jack]

RobbeK
I changed the resedue as suggested and it fixed the strange result when using scaling factor 5

[Aurel]

hi Rob
Your example of Mandelbrot is interesting because fractal is created from
outside to inside ..nice effect..

[RobbeK]

Thanks Aurel

Hi Jack,  yes I suspected that value was too small for single floats.  I added the viewport width now ....

now embedding Newlisp into freebasic , could be vary handy sometimes

best , Rob

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