My collection of semi-useful scripts.
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scripts/24-bit-color-test.sh

92 lines
2.0 KiB

#!/usr/bin/env 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 $blue are integers
# ranging between 0 and 255 inclusive
rainbowColor()
{
h=$(($1 / 43))
f=$(($1 - 43 * h))
t=$((f * 255 / 43))
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 $(seq 255 -1 128); do
setBackgroundColor "$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 $(seq 255 -1 128); do
setBackgroundColor 0 "$i" 0
echo -n " "
done
resetOutput
for i in $(seq 0 127); do
setBackgroundColor 0 0 "$i"
echo -n " "
done
resetOutput
for i in $(seq 255 -1 128); do
setBackgroundColor 0 0 "$i"
echo -n " "
done
resetOutput
for i in $(seq 0 127); do
# shellcheck disable=SC2046
setBackgroundColor $(rainbowColor "$i")
echo -n " "
done
resetOutput
for i in $(seq 255 -1 128); do
# shellcheck disable=SC2046
setBackgroundColor $(rainbowColor "$i")
echo -n " "
done
resetOutput