Created
October 31, 2013 21:53
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#!/bin/sh | |
declare -i f=75 s=13 r=2000 t=0 c=1 n=0 l=0 | |
declare -ir w=$(tput cols) h=$(tput lines) | |
declare -i x=$((w/2)) y=$((h/2)) | |
declare -ar v=( [00]="\x83" [01]="\x8f" [03]="\x93" | |
[10]="\x9b" [11]="\x81" [12]="\x93" | |
[21]="\x97" [22]="\x83" [23]="\x9b" | |
[30]="\x97" [32]="\x8f" [33]="\x81" ) | |
OPTIND=1 | |
while getopts "f:s:r:h" arg; do | |
case $arg in | |
f) ((f=($OPTARG>19 && $OPTARG<101)?$OPTARG:$f));; | |
s) ((s=($OPTARG>4 && $OPTARG<16 )?$OPTARG:$s));; | |
r) ((r=($OPTARG>0)?$OPTARG:$r));; | |
h) echo -e "Usage: pipes [OPTION]..." | |
echo -e "Animated pipes terminal screensaver.\n" | |
echo -e " -f [20-100]\tframerate (D=75)." | |
echo -e " -s [5-15]\tprobability of a straight fitting (D=13)." | |
echo -e " -r LIMIT\treset after x characters (D=2000)." | |
echo -e " -h\t\thelp (this screen).\n" | |
exit 0;; | |
esac | |
done | |
tput smcup | |
tput reset | |
tput civis | |
while ! read -t0.0$((1000/$f)) -n1; do | |
# New position: | |
(($l%2)) && ((x+=($l==1)?1:-1)) | |
((!($l%2))) && ((y+=($l==2)?1:-1)) | |
# Loop on edges (change color on loop): | |
((c=($x>$w || $x<0 || $y>$h || $y<0)?($RANDOM%7-1):$c)) | |
((x=($x>$w)?0:(($x<0)?$w:$x))) | |
((y=($y>$h)?0:(($y<0)?$h:$y))) | |
# New random direction: | |
((n=$RANDOM%$s-1)) | |
((n=($n>1||$n==0)?$l:$l+$n)) | |
((n=($n<0)?3:$n%4)) | |
# Print: | |
tput cup $y $x | |
echo -ne "\033[1;3${c}m\xe2\x94${v[$l$n]}" | |
(($t>$r)) && tput reset && tput civis && t=0 || ((t++)) | |
l=$n | |
done | |
tput rmcup |
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