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Test 24 bit colors in terminals
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#!/bin/bash | |
# | |
# This file echoes a bunch of 24-bit color codes | |
# to the terminal to demonstrate its functionality. | |
# The foreground escape sequence is ^[38;2;<r>;<g>;<b>m | |
# The background escape sequence is ^[48;2;<r>;<g>;<b>m | |
# <r> <g> <b> range from 0 to 255 inclusive. | |
# The escape sequence ^[0m returns output to default | |
setBackgroundColor() | |
{ | |
echo -en "\x1b[48;2;$1;$2;$3""m" | |
} | |
resetOutput() | |
{ | |
echo -en "\x1b[0m\n" | |
} | |
# Gives a color $1/255 % along HSV | |
# Who knows what happens when $1 is outside 0-255 | |
# Echoes "$red $green $blue" where | |
# $red $green and $blue are integers | |
# ranging between 0 and 255 inclusive | |
rainbowColor() | |
{ | |
let h=$1/43 | |
let f=$1-43*$h | |
let t=$f*255/43 | |
let q=255-t | |
if [ $h -eq 0 ] | |
then | |
echo "255 $t 0" | |
elif [ $h -eq 1 ] | |
then | |
echo "$q 255 0" | |
elif [ $h -eq 2 ] | |
then | |
echo "0 255 $t" | |
elif [ $h -eq 3 ] | |
then | |
echo "0 $q 255" | |
elif [ $h -eq 4 ] | |
then | |
echo "$t 0 255" | |
elif [ $h -eq 5 ] | |
then | |
echo "255 0 $q" | |
else | |
# execution should never reach here | |
echo "0 0 0" | |
fi | |
} | |
for i in `seq 0 127`; do | |
setBackgroundColor $i 0 0 | |
echo -en " " | |
done | |
resetOutput | |
for i in `seq 255 128`; do | |
setBackgroundColor $i 0 0 | |
echo -en " " | |
done | |
resetOutput | |
for i in `seq 0 127`; do | |
setBackgroundColor 0 $i 0 | |
echo -n " " | |
done | |
resetOutput | |
for i in `seq 255 128`; do | |
setBackgroundColor 0 $i 0 | |
echo -n " " | |
done | |
resetOutput | |
for i in `seq 0 127`; do | |
setBackgroundColor 0 0 $i | |
echo -n " " | |
done | |
resetOutput | |
for i in `seq 255 128`; do | |
setBackgroundColor 0 0 $i | |
echo -n " " | |
done | |
resetOutput | |
for i in `seq 0 127`; do | |
setBackgroundColor `rainbowColor $i` | |
echo -n " " | |
done | |
resetOutput | |
for i in `seq 255 128`; do | |
setBackgroundColor `rainbowColor $i` | |
echo -n " " | |
done | |
resetOutput | |
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