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Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 1:47 pm
by GijsB
Edit :
I now know what was wrong with the code and what was wrong with the scaling and moving and zooming etc..
so finnaly :
(move with 'wasd', zoom in and out with mousewheel, increase iterations with and 'u' and 'j' and increase size with 'y' and 'h')
(improvements ideas?)
oh and OpenGL version :
http://glsl.heroku.com/e#4645.2
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 1:52 pm
by kikito
Can't MainCalculation be defined once, outside of the loops? Adding parameters, I suppose.
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 1:57 pm
by Robin
And it may also not be wise to put that code in love.draw. Instead, use
Framebuffers. (Just ask if you need help figuring out how they work.
)
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 2:28 pm
by GijsB
i understand where those framebuffers are for, but i dont know how to use them 3:
anyway, i speeded up the code :
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 4:02 pm
by Robin
You are on the right track.
Look at this:
Code: Select all
function MainCalculation(jx, jy, wx, wy, k)
local tx = wx*wx-(wy*wy+jx)
local ty = 2.0*wx*wy+jy
if tx*tx+ty*ty<=m and k<kt then
return MainCalculation(jx, jy, tx, ty, k + 1)
end
return k
end
for x = 0,size,resolution do
local jx = xmin+x*dx
for y = 0,size,resolution do
local jy = ymin+y*dy
table.insert(pixels,{X = x, Y = y, C = MainCalculation(jx, jy, 0, 0, 0)})
end
end
Do you understand what changes I made?
I'll explain Framebuffers if you are ready for it and can't figure it out on your own (but I think you can).
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 4:18 pm
by tentus
GijsB wrote:i understand where those framebuffers are for, but i dont know how to use them 3:
anyway, i speeded up the code :
Note that framebuffers are not universally supported (about 81% of us support them, according to
this source). I would recommend avoiding them unless you need them, since coding a graceful degradation essentially means twice the work, if not more, for a benefit that about a fifth of the community can never see.
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 4:34 pm
by GijsB
Robin, yes and there awesome
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 10:26 pm
by kraftman
Very cool (runs much quicker in LoveJIT btw)
Spent a while reading up on it and playing with the code/colours
- test1.png (108.88 KiB) Viewed 9383 times
Also found this which is quite cool:
http://www.youtube.com/watch?v=P3WdnLSI2hs
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 10:29 pm
by GijsB
But does anybody know how to zoom into it xD?
Re: Mandelbrot fractal maker
Posted: Thu Jul 21, 2011 10:32 pm
by kraftman
GijsB wrote:But does anybody know how to zoom into it xD?
change xmin/xmax ymin/ymax