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|
#!/bin/bash
W=$(tput cols) H=$(tput lines)
# maximal random value + 1
M=32768
SETS=('╱╲' '/\')
COLORS=(31 32 33 34 35 36 37)
# default values
N=1
T=0
I=0.05
P=25
R=$((W * H / 4))
HELP="Usage: $(basename $0) [OPTIONS]
Animated pipes.sh terminal screensaver at an angle.
Options:
-n [1-] number of pipes. (Default: $N)
-t [0-$((${#SETS[@]} - 1))] type of pipes. (Default: $T)
-i [float] piping interval or maze generation interval. (Default: $I)
-P [0-100] probability of a turning pipe or of \\ in maze generation. (Default: $P)
-r [LIMIT] reset after x characters, 0 if no limit. (Default: $R)
-R random starting point.
-C no color.
-X maze generation.
-h this help message.
"
while getopts "n:t:i:P:r:RCXh" arg; do
case $arg in
n)
((N = OPTARG > 0 ? OPTARG : N))
;;
t)
((T = (OPTARG >= 0 && OPTARG < ${#SETS[@]}) ? OPTARG : T))
;;
i)
I=$OPTARG
;;
P)
((P = (OPTARG >= 0 && OPTARG <= 100) ? OPTARG : P))
;;
r)
((R = OPTARG >= 0 ? OPTARG : R))
;;
R)
RNDSTART=1
;;
C)
NOCOLOR=1
;;
X)
MAZE=1
;;
h)
echo -e "$HELP"
exit 0
;;
esac
done
do_exit() {
# Show cursor and echo stdin
echo -ne "\e[?25h"
stty echo
clear
exit 0
}
trap do_exit INT TERM
# No echo stdin and hide the cursor
stty -echo
echo -ne "\e[?25l"
# maze geneartion
while [[ $MAZE ]] && clear; do
[[ $NOCOLOR ]] || echo -ne "\e[1;${COLORS[${#COLORS[@]} * RANDOM / M]}m"
for ((i = 0; i < W * H; i++ )); do
echo -ne ${SETS[T]:100 * RANDOM / M < P:1}
done
read -t $I -n 1 && [[ $REPLY =~ q|Q ]] && do_exit
done
# initialze values
for ((n = 0; n < N; n++)); do
((X[n] = RNDSTART ? (W + 2) * RANDOM / M : W / 2))
((Y[n] = RNDSTART ? (H + 2) * RANDOM / M : H / 2))
D[n]=$((4 * RANDOM / M))
C[n]=${COLORS[${#COLORS[@]} * RANDOM / M]}
done
clear
while :; do
for ((n = 0; n < N; n++, CC = 0)); do
x=${X[n]} y=${Y[n]}
d=${D[n]} c=${C[n]}
# calculate new direction `d`
# 1 0
# \/ 4 directions 0 to 3
# /\
# 2 3
# valid directions: d: dd', d' is the new direction
# d
# 0: / 00 \ 01 03
# / / /\
# 1: / 10 \ 11 12
# \ \ /\
# 2: \/ 21 / 22 / 23
# / \
# 3: \/ 30 \ 32 \ 33
# / \
((d = (100 * RANDOM / M) < P ? ((d + 1) + 2 * (RANDOM % 2)) % 4 : d))
((e = (d + 1) % 4))
# calculate new position
# d' x' y'
# 0: x+1 y-1
# 1: x-1 y-1
# 2: x-1 y+1
# 3: x+1 y+1
((xn = e < 2 ? x + 1 : x - 1))
((yn = d < 2 ? y - 1 : y + 1))
# adjust position and change color?
((d < 2 && y == 0)) && ((yn--, CC=1))
((e > 1 && x == 0)) && ((xn--, CC=1))
((d > 1 && y == H)) && ((yn++, CC=1))
((e < 2 && x == W)) && ((xn++, CC=1))
((CC)) && c=${COLORS[${#COLORS[@]} * RANDOM / M]}
# warp pipe
((xn = (xn + W + 1) % (W + 1)))
((yn = (yn + H + 1) % (H + 1)))
# calculate position in terminal
# d' xt yt
# 0: x' y'+1
# 1: x'+1 y'+1
# 2: x'+1 y'
# 3: x' y'
((xt = e < 2 ? xn : xn + 1))
((yt = d < 2 ? yn + 1 : yn))
echo -ne "\e[${yt};${xt}H"
[[ $NOCOLOR ]] || echo -ne "\e[1;${c}m"
echo -n "${SETS[T]:d%2:1}"
X[n]=$xn Y[n]=$yn
D[n]=$d C[n]=$c
done
read -t $I -n 1 && [[ $REPLY =~ q|Q ]] && do_exit
((R)) && ((r += N, r >= R)) && r=0 && clear
done
do_exit
|
