julia

#!/usr/bin/env bash
# Copyright (C) 2018 Grzegorz Wcisło

# polar coordinates
radius=0.78
phi=0

main() {
    init
    while :; do
        # rotate parameter and redraw
        phi=$(echo "$phi" | awk '{printf("%f", $1 + 0.05)}')
        draw
        sleep 0.05
    done
}

init() {
    resize

    # set default parameters
    x=-0.5
    y=0
    scale=$DEFAULT_SCALE
    max_iter=15
    fractal=m

    # save terminal state, hide cursor and clear
    tput smcup
    tput civis
    tput clear

    trap 'resize; draw' WINCH # terminal resize signal
    trap cleanup INT
}

resize() {
    # set new width and height
    w=$(tput cols)
    h=$(tput lines)
    DEFAULT_SCALE=$h
}

draw() {
    # move cursor to (0,0)
    tput cup 0 0

    # calculate carthesian coordinates
    px=$(echo "$phi $radius" | awk '{printf("%f", $2*cos($1))}')
    py=$(echo "$phi $radius" | awk '{printf("%f", $2*sin($1))}')

    # draw fractal
    ./mandelbrot.out j $w $h $scale 0 0 $max_iter $px $py
}

show_debug() {
    tput cup 0 0
    echo "Position: ($x,$y)"
    echo "Zoom: $scale"
    echo "Parameter: ($px,$py)"
}

cleanup() {
    # restore teminal state and show cursor
    tput rmcup
    tput cnorm
    exit 0
}

main