Just for fun

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

A long time ago Alan Third posted the following function to zsh-users.
Anyone want to have a stab at updating it to use the new prompt coloring
code for better accuracy?

function most_useless_use_of_zsh {
    local lines columns colour a b p q i pnew
    ((columns=COLUMNS-1, lines=LINES-1, colour=0))
    for ((b=-1.5; b<=1.5; b+=3.0/lines)) do
        for ((a=-2.0; a<=1; a+=3.0/columns)) do
            for ((p=0.0, q=0.0, i=0; p*p+q*q < 4 && i < 32; i++)) do
                ((pnew=p*p-q*q+a, q=2*p*q+b, p=pnew))
            done
            ((colour=(i/4)%8))
            echo -n "\\e[4${colour}m " 
        done
        echo
    done
}

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