rgb-demo.sh

##
# BASH-UI - Bash User Interface Tools
# Copyright 2017 by Chad Juliano
# 
# Licensed under GNU Lesser General Public License v3.0 only. Some rights
# reserved. See LICENSE.
##

set -o nounset

source ${BUI_HOME}/bui-term-sgr.sh

function fn_rgb16_demo()
{
    echo "ansi16 8x2:"

    local _color
    local _light

    for _light in {0..1}
    do
        fn_sgr_print "L=${_light}) " 
        for _color in {0..7}
        do
            fn_sgr_ansi16_set $((SGR_ATTR_BG + _light*SGR_ATTR_BRIGHT)) $_color || exit 1
            fn_sgr_print '   '
        done
        fn_sgr_op $SGR_ATTR_DEFAULT
        echo
    done
    echo
}

function fn_grey26_demo()
{
    echo "grey26 26x1:"

    local _light

    for _light in {0..25}
    do
        fn_sgr_grey26_set $SGR_ATTR_BG $_light || exit 1
        fn_sgr_print ' '
    done

    fn_sgr_op $SGR_ATTR_DEFAULT
    echo
    echo
}

function fn_rgb216_grad_demo()
{
    echo "rgb216 6x4:"

    fn_sgr_print 'R) ' 
    for _red in {0..5}
    do
        fn_sgr_rgb216_set $SGR_ATTR_BG $_red 0 0 || exit 1
        fn_sgr_print '   '
    done
    fn_sgr_op $SGR_ATTR_DEFAULT
    echo

    fn_sgr_print 'G) ' 
    for _green in {0..5}
    do
        fn_sgr_rgb216_set $SGR_ATTR_BG 0 $_green 0 || exit 1
        fn_sgr_print '   '
    done
    fn_sgr_op $SGR_ATTR_DEFAULT
    echo

    fn_sgr_print 'B) ' 
    for _blue in {0..5}
    do
        fn_sgr_rgb216_set $SGR_ATTR_BG 0 0 $_blue || exit 1
        fn_sgr_print '   '
    done
    fn_sgr_op $SGR_ATTR_DEFAULT
    echo

    fn_sgr_print 'W) ' 
    for _grey in {0..5}
    do
        fn_sgr_rgb216_set $SGR_ATTR_BG $_grey $_grey $_grey || exit 1
        fn_sgr_print '   '
    done
    fn_sgr_op $SGR_ATTR_DEFAULT
    echo

    echo
}

function fn_rgb216_grid_demo()
{
    echo "rgb216 36x6:"
    local _red _green _blu

    for _red in {0..5}
    do
        fn_sgr_print "${_red}) " 
        for _green in {0..5}
        do
            for _blue in {0..5}
            do
                fn_sgr_rgb216_set $SGR_ATTR_BG $_red $_green $_blue || exit 1
                fn_sgr_print ' '
            done
        done
        fn_sgr_op $SGR_ATTR_DEFAULT
        echo
    done
    echo
}

# display 16 basic colors
fn_rgb16_demo

# display a linear gradient of grayscale
fn_grey26_demo

# display linear gradients of RGB
fn_rgb216_grad_demo

# display a 6x36 block of all RGB colors
fn_rgb216_grid_demo