Julia set: Difference between revisions

=={{header|zkl}}==

Uses the PPM class from http://rosettacode.org/wiki/Bitmap/Bresenham%27s_line_algorithm#zkl

{{trans|Java}}

[[File:JuliaSet.zkl.jpg|250px|thumb|right]]

<lang zkl>fcn juliaSet{

w,h,zoom:=800,600, 1;

bitmap:=PPM(w,h,0xFF|FF|FF); // White background

cX,cY:=-0.7, 0.27015;

moveX,moveY:=0.0, 0.0;

maxIter:=255;

foreach x,y in (w,h){

zx:=1.5*(x - w/2)/(0.5*zoom*w) + moveX;

zy:=1.0*(y - h/2)/(0.5*zoom*h) + moveY;

i:=maxIter;

while(zx*zx + zy*zy < 4 and i > 1){

tmp:=zx*zx - zy*zy + cX;

zy,zx=2.0*zx*zy + cY, tmp;

i-=1;

}

// convert byte to RGB (3 bytes), kinda magic to get nice colors

bitmap[x,y]=i.shiftLeft(21) + i.shiftLeft(10) + i*8;

}

bitmap.writeJPGFile("juliaSet.jpg",True);

}();</lang>