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188 lines
5.0 KiB
Plaintext
188 lines
5.0 KiB
Plaintext
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#!/usr/bin/env bash
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# Animated pipes.sh terminal screensaver at an angle.
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# Copyright (C) 2013 by Yu-Jie Lin
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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#
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# Blog: http://blog.yjl.im/2013/07/pipesxsh-animated-pipessh-terminal.html
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# Gist: https://gist.github.com/livibetter/5974905
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# Screenshot: https://lh3.googleusercontent.com/-UaCta_DtgrQ/Ud6dqIgcfmI/AAAAAAAAE_8/VXPac0OpULU/s800/pipesX.sh.gif
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# Screenshot: https://lh6.googleusercontent.com/-yBety-A8J_c/Ud6dk10sjBI/AAAAAAAAE_0/S98aRRV8t0s/s800/pipesX.sh%25202013-07-11--19%253A51%253A05.png
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# Screencast: http://youtu.be/dITTlFPYVPA
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W=$(tput cols) H=$(tput lines)
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# maximal random value + 1
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M=32768
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SETS=('╱╲' '/\')
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COLORS=(31 32 33 34 35 36 37)
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# default values
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N=1
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T=0
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I=0.05
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P=25
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R=$((W * H / 4))
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HELP="Usage: $(basename $0) [OPTIONS]
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Animated pipes.sh terminal screensaver at an angle.
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Options:
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-n [1-] number of pipes. (Default: $N)
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-t [0-$((${#SETS[@]} - 1))] type of pipes. (Default: $T)
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-i [float] piping interval or maze generation interval. (Default: $I)
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-P [0-100] probability of a turning pipe or of \\ in maze generation. (Default: $P)
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-r [LIMIT] reset after x characters, 0 if no limit. (Default: $R)
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-R random starting point.
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-C no color.
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-X maze generation.
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-h this help message.
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"
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while getopts "n:t:i:P:r:RCXh" arg; do
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case $arg in
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n)
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((N = OPTARG > 0 ? OPTARG : N))
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;;
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t)
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((T = (OPTARG >= 0 && OPTARG < ${#SETS[@]}) ? OPTARG : T))
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;;
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i)
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I=$OPTARG
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;;
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P)
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((P = (OPTARG >= 0 && OPTARG <= 100) ? OPTARG : P))
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;;
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r)
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((R = OPTARG >= 0 ? OPTARG : R))
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;;
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R)
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RNDSTART=1
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;;
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C)
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NOCOLOR=1
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;;
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X)
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MAZE=1
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;;
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h)
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echo -e "$HELP"
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exit 0
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;;
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esac
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done
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do_exit() {
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# Show cursor and echo stdin
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echo -ne "\e[?25h"
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stty echo
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clear
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exit 0
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}
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trap do_exit INT TERM
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# No echo stdin and hide the cursor
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stty -echo
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echo -ne "\e[?25l"
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# maze geneartion
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while [[ $MAZE ]] && clear; do
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[[ $NOCOLOR ]] || echo -ne "\e[1;${COLORS[${#COLORS[@]} * RANDOM / M]}m"
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for ((i = 0; i < W * H; i++ )); do
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echo -ne ${SETS[T]:100 * RANDOM / M < P:1}
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done
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read -t $I -n 1 && [[ $REPLY =~ q|Q ]] && do_exit
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done
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# initialze values
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for ((n = 0; n < N; n++)); do
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((X[n] = RNDSTART ? (W + 2) * RANDOM / M : W / 2))
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((Y[n] = RNDSTART ? (H + 2) * RANDOM / M : H / 2))
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D[n]=$((4 * RANDOM / M))
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C[n]=${COLORS[${#COLORS[@]} * RANDOM / M]}
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done
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clear
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while :; do
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for ((n = 0; n < N; n++, CC = 0)); do
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x=${X[n]} y=${Y[n]}
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d=${D[n]} c=${C[n]}
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# calculate new direction `d`
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# 1 0
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# \/ 4 directions 0 to 3
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# /\
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# 2 3
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# valid directions: d: dd', d' is the new direction
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# d
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# 0: / 00 \ 01 03
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# / / /\
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# 1: / 10 \ 11 12
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# \ \ /\
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# 2: \/ 21 / 22 / 23
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# / \
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# 3: \/ 30 \ 32 \ 33
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# / \
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((d = (100 * RANDOM / M) < P ? ((d + 1) + 2 * (RANDOM % 2)) % 4 : d))
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((e = (d + 1) % 4))
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# calculate new position
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# d' x' y'
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# 0: x+1 y-1
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# 1: x-1 y-1
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# 2: x-1 y+1
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# 3: x+1 y+1
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((xn = e < 2 ? x + 1 : x - 1))
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((yn = d < 2 ? y - 1 : y + 1))
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# adjust position and change color?
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((d < 2 && y == 0)) && ((yn--, CC=1))
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((e > 1 && x == 0)) && ((xn--, CC=1))
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((d > 1 && y == H)) && ((yn++, CC=1))
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((e < 2 && x == W)) && ((xn++, CC=1))
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((CC)) && c=${COLORS[${#COLORS[@]} * RANDOM / M]}
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# warp pipe
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((xn = (xn + W + 1) % (W + 1)))
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((yn = (yn + H + 1) % (H + 1)))
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# calculate position in terminal
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# d' xt yt
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# 0: x' y'+1
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# 1: x'+1 y'+1
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# 2: x'+1 y'
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# 3: x' y'
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((xt = e < 2 ? xn : xn + 1))
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((yt = d < 2 ? yn + 1 : yn))
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echo -ne "\e[${yt};${xt}H"
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[[ $NOCOLOR ]] || echo -ne "\e[1;${c}m"
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echo -n "${SETS[T]:d%2:1}"
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X[n]=$xn Y[n]=$yn
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D[n]=$d C[n]=$c
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done
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read -t $I -n 1 && [[ $REPLY =~ q|Q ]] && do_exit
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((R)) && ((r += N, r >= R)) && r=0 && clear
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done
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do_exit
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