Posted By
MMS
on 2024-04-04
15:30:51
 |  Re: Simple but nice BASIC code examples
Aaaah, thank you @George, a nice Mandelbrot.
Fractals were my thesis work at the university. I like fractals 
Herewith I attach the slightly modified version of the above 64'er program from G.Paret, the code produced a more familiar shape with other parameters
UPADTE 04.03: I agree with the comment I received the border would llok better in black. Very easy on 264 machines :-)
Up the Mandrels!
The code (I copied two of your "best practices" graphic 0 after drawing; use a "run" after the code, so it can run at once after copied just by pressing an ENTER):
10 graphic3,1:color0,1:color1,1:
20 color1,6,4:color2,6,6: color3,6,1:color4,1:rem recolor
30 xm=105:ym=105:xc=1:yc=0:T=20:S=60
35 xl=-0.15:xr=0.26:yo=0.47:yu=0.9
40 dx=(xr-xl)/xm:dy=(yu-yo)/ym
50 for n=0 to ym:y1=yo+n*dy:for m=0 to xm: x=xl+m*dx:y=y1:k=0
60 x2=x*x:y2=y*y:y=2*x*y-yc:x=x2-y2-xc:k=k+1
65 if (k < t) and (x2+y2 < s) then goto 60
70 u=m+53-n/2:u1=u+1:v=n+80:v1=v-3*(k-1)
75 draw3,u,v to u,v1:draw2,u1,v to u1,v1:draw1,u,v1 to u1,v1
80 next:next
90 getkey a$
100 graphic0,1
run
how it looks like (updated to have black border):
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