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128 lines
2.4 KiB
Bash
128 lines
2.4 KiB
Bash
#!/bin/bash
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#
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# This file echoes four gradients with 24-bit color codes
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# to the terminal to demonstrate their functionality.
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# The foreground escape sequence is ^[38;2;<r>;<g>;<b>m
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# The background escape sequence is ^[48;2;<r>;<g>;<b>m
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# <r> <g> <b> range from 0 to 255 inclusive.
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# The escape sequence ^[0m returns output to default
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#
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# From
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# https://github.com/gnachman/iTerm2/blob/master/tests/24-bit-color.sh
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# and presumably covered by
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# https://github.com/gnachman/iTerm2/blob/master/LICENSE
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#
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SEQ1=
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if which gseq >/dev/null 2>&1; then
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SEQ1=gseq
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elif seq --version|grep -q GNU; then
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SEQ1=seq
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fi
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if [ -n "$SEQ1" ]; then
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# GNU seq requires a -ve increment if going backwards
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seq1()
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{
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if [ $1 -gt $2 ]; then
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$SEQ1 $1 -1 $2
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else
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$SEQ1 $1 $2
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fi
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}
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SEQ=seq1
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else
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SEQ=seq
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fi
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SEPARATOR=':'
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setBackgroundColor()
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{
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echo -en "\033[48${SEPARATOR}2${SEPARATOR}$1${SEPARATOR}$2${SEPARATOR}$3""m"
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}
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resetOutput()
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{
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echo -en "\033[0m\n"
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}
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# Gives a color $1/255 % along HSV
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# Who knows what happens when $1 is outside 0-255
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# Echoes "$red $green $blue" where
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# $red $green and $blue are integers
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# ranging between 0 and 255 inclusive
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rainbowColor()
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{
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let h=$1/43
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let f=$1-43*$h
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let t=$f*255/43
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let q=255-t
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if [ $h -eq 0 ]
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then
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echo "255 $t 0"
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elif [ $h -eq 1 ]
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then
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echo "$q 255 0"
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elif [ $h -eq 2 ]
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then
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echo "0 255 $t"
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elif [ $h -eq 3 ]
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then
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echo "0 $q 255"
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elif [ $h -eq 4 ]
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then
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echo "$t 0 255"
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elif [ $h -eq 5 ]
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then
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echo "255 0 $q"
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else
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# execution should never reach here
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echo "0 0 0"
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fi
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}
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for i in `$SEQ 0 127`; do
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setBackgroundColor $i 0 0
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echo -en " "
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done
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resetOutput
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for i in `$SEQ 255 128`; do
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setBackgroundColor $i 0 0
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echo -en " "
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done
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resetOutput
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for i in `$SEQ 0 127`; do
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setBackgroundColor 0 $i 0
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echo -n " "
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done
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resetOutput
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for i in `$SEQ 255 128`; do
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setBackgroundColor 0 $i 0
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echo -n " "
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done
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resetOutput
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for i in `$SEQ 0 127`; do
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setBackgroundColor 0 0 $i
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echo -n " "
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done
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resetOutput
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for i in `$SEQ 255 128`; do
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setBackgroundColor 0 0 $i
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echo -n " "
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done
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resetOutput
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for i in `$SEQ 0 127`; do
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setBackgroundColor `rainbowColor $i`
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echo -n " "
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done
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resetOutput
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for i in `$SEQ 255 128`; do
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setBackgroundColor `rainbowColor $i`
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echo -n " "
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done
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resetOutput
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