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130 lines
3.9 KiB
Bash
130 lines
3.9 KiB
Bash
#!/bin/bash
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# Let it Rain!
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# Copyright (C) 2011, 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/let-it-rain.html
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# Gist: https://gist.github.com/livibetter/5933594
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# Gif : https://lh5.googleusercontent.com/-0WJ1vSZcFPs/UdadOwdPEXI/AAAAAAAAE-c/6kuH9hP3cUo/s800/rain.sh.gif
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# Clip: http://youtu.be/EssRgAh2w_c
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#
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# Modified from falling-<3s.sh:
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# http://blog.yjl.im/2011/02/time-to-have-falling-hearts-screensaver.html
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RAINS=("|" "│" "┃" "┆" "┇" "┊" "┋" "╽" "╿")
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COLORS=("\e[37m" "\e[37;1m")
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# More from 256 color mode
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for i in {244..255}; do
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COLORS=("${COLORS[@]}" "\e[38;5;${i}m")
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done
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NRAINS=${#RAINS[@]}
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NCOLORS=${#COLORS[@]}
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NUM_RAIN_METADATA=5
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sigwinch() {
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TERM_WIDTH=$(tput cols)
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TERM_HEIGHT=$(tput lines)
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STEP_DURATION=0.025
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((MAX_RAINS = TERM_WIDTH * TERM_HEIGHT / 4))
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((MAX_RAIN_LENGTH = TERM_HEIGHT < 10 ? 1 : TERM_HEIGHT / 10))
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# In percentage
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((NEW_RAIN_ODD = TERM_HEIGHT > 50 ? 100 : TERM_HEIGHT * 2))
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((NEW_RAIN_ODD = NEW_RAIN_ODD * 75 / 100))
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((FALLING_ODD = TERM_HEIGHT > 25 ? 100 : TERM_HEIGHT * 4))
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((FALLING_ODD = FALLING_ODD * 90 / 100))
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}
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do_exit() {
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echo -ne "\e[${TERM_HEIGHT};1H\e[0K"
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# Show cursor and echo stdin
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echo -ne "\e[?25h"
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stty echo
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exit 0
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}
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do_render() {
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# Clean screen first
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for ((idx = 0; idx < num_rains * NUM_RAIN_METADATA; idx += NUM_RAIN_METADATA)); do
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X=${rains[idx]}
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Y=${rains[idx + 1]}
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LENGTH=${rains[idx + 4]}
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for ((y = Y; y < Y + LENGTH; y++)); do
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(( y < 1 || y > TERM_HEIGHT )) && continue
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echo -ne "\e[${y};${X}H "
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done
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done
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for ((idx = 0; idx < num_rains * NUM_RAIN_METADATA; idx += NUM_RAIN_METADATA)); do
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if ((100 * RANDOM / 32768 < FALLING_ODD)); then
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# Falling
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if ((++rains[idx + 1] > TERM_HEIGHT)); then
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# Out of screen, bye sweet <3
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rains=("${rains[@]:0:idx}"
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"${rains[@]:idx+NUM_RAIN_METADATA:num_rains*NUM_RAIN_METADATA}")
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((num_rains--))
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continue
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fi
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fi
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X=${rains[idx]}
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Y=${rains[idx + 1]}
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RAIN=${rains[idx + 2]}
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COLOR=${rains[idx + 3]}
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LENGTH=${rains[idx + 4]}
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for ((y = Y; y < Y + LENGTH; y++)); do
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(( y < 1 || y > TERM_HEIGHT )) && continue
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echo -ne "\e[${y};${X}H${COLOR}${RAIN}"
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done
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done
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}
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trap do_exit TERM INT
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trap sigwinch WINCH
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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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echo -ne "\e[2J"
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rains=()
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sigwinch
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while :; do
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read -n 1 -t $STEP_DURATION ch
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case "$ch" in
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q|Q)
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do_exit
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;;
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esac
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if ((num_rains < MAX_RAINS)) && ((100 * RANDOM / 32768 < NEW_RAIN_ODD)); then
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# Need new |, 1-based
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RAIN="${RAINS[NRAINS * RANDOM / 32768]}"
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COLOR="${COLORS[NCOLORS * RANDOM / 32768]}"
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LENGTH=$((MAX_RAIN_LENGTH * RANDOM / 32768 + 1))
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X=$((TERM_WIDTH * RANDOM / 32768 + 1))
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Y=$((1 - LENGTH))
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rains=("${rains[@]}" "$X" "$Y" "$RAIN" "$COLOR" "$LENGTH")
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((num_rains++))
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fi
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# Let rain fall!
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do_render
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done
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