55 lines
998 B
Lua
55 lines
998 B
Lua
--BRUSH Scene: Mandelbrot fractal v0.5
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--by Richard Fhager
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--http://hem.fyristorg.com/dawnbringer/
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-- This script was adopted from Evalion, a Javascript codecrafting/imageprocessing project
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--http://goto.glocalnet.net/richard_fhager/evalion/evalion.html
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colors = 64
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x0 = -1.7
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x1 = 0.7
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ym = 0
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iter = 64
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ok, x0, x1, ym, iter = inputbox("Fractal data",
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"X0", x0, -2, 2,4,
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"X1", x1, -2, 2,4,
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"midY", ym, -2, 2,4,
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"Iter", iter, 1, 2048,0
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);
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-- -0.831116819,-0.831116815,0.2292112435,192
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function mandel(x,y,l,r,o,i) -- pos. as fraction of 1, left coord, right coord, y coord, iterations
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local w,s,a,p,q,n,v,w
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s=math.abs(r-l);
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a = l + s*x;
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p = a;
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b = o - s*(y-0.5);
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q = b;
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n = 1;
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v = 0;
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w = 0;
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while (v+w<4 and n<i) do n=n+1; v=p*p; w=q*q; q=2*p*q+b; p=v-w+a; end;
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return n
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end
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w, h = getbrushsize()
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for x = 0, w - 1, 1 do
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for y = 0, h - 1, 1 do
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q = mandel(x/w,y/h,x0,x1,ym,iter) % colors;
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putbrushpixel(x, y, q);
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end
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end
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