1 ( --- Complex integer arithmetic --- )
3 : c* ( x1 y1 x2 y2 -- x3 y3 )
4 swap rot ( x1 x2 y1 y2 )
5 2dup * negate ( x1 x2 y1 y2 -y1y2 )
6 4 pick 4 pick * + ( x1 x2 y1 y2 (x1x2-y1y2))
7 4 roll 2 roll * ( x2 y1 (x1x2-y1y2) x1y2 )
8 3 roll 3 roll * + ( (x1x2-y1y2) (x1y2+x2y1) )
11 : c+ ( x1 y1 x2 y2 -- x3 y3 )
19 ; cmagsq ( x1 y1 -- mag )
23 ( --- Mandelbrot set calculations --- )
25 : iterate ( cr ci zr zi -- cr ci z'r z'i )
29 : inSet? ( cr ci -- res )
33 2SWAP 2DUP 5 ROLL 5 ROLL