bouncedvd.sh

#!/bin/bash

WIDTH=160
HEIGHT=75
X=0
Y=30
XDIR="r"
YDIR="b"
XOFFSET=150
YOFFSET=65

trap tarp SIGTERM SIGINT
# remove any leftover processes
function tarp() {
        pkill png2ping
        exit
}

while true; do
        # send pings to (x,y)
        /root/png2ping -file dvd.png -prefix "2001:610:1908:a000" -show-stats=false -offset-x ${X} -offset-y ${Y} -max-rate 220000 &
        PID=$!
        case "${XDIR}" in
                r)
                        X=$((X + XOFFSET))
                        if [[ "$((X + WIDTH))" -ge 1920 ]]; then
                                X=$((1920 - WIDTH))
                                XDIR="l"
                        fi
                ;;
                l)
                        X=$((X - XOFFSET))
                        if [[ "${X}" -le 0 ]]; then
                                X=0
                                XDIR="r"
                        fi
                ;;
        esac
        case "${YDIR}" in
                t)
                        Y=$((Y - YOFFSET))
                        if [[ "${Y}" -le 0 ]]; then
                                Y=0
                                YDIR="b"
                        fi

                ;;
                b)
                        Y=$((Y + YOFFSET))
                        if [[ "$((Y + HEIGHT))" -ge 1080 ]]; then
                                Y=$((1080 - HEIGHT))
                                YDIR="t"
                        fi
                ;;
        esac
        sleep 4
        kill ${PID}
done;