color slice script

[Nibby Nebbulous]

Here's something I wrote to test xterm, if you'd like it.

#!/usr/bin/env bash

# Print a slice of color like:
# ________________
# |green      red|
# |              |
# |cyan   magenta|
# ----------------
#
# It should look smooth if your terminal supports enough colors.

#clear
b=0

get_screen_size()
{
  local sizes=$(stty size)
  if [ $? = 0 ] ; then
    set $sizes
    screen_rows="$1"
    screen_cols="$2"
  fi
}

get_screen_size

rows=$((screen_rows - 2))
cols=$((screen_cols - 1))
blue_step=$((255 / rows))
red_green_step=$((255 / cols))

row=0
b=0
while [ $row -lt $rows ] ; do
  col=0
  r=0
  g=255
  while [ $col -lt $cols ] ; do
    #printf "\e[38;2;${r};${g};${b}m#"
    printf "\e[48;2;${r};${g};${b}m "
    r=$((r + red_green_step))
    g=$((g - red_green_step))
    col=$((col + 1))
  done
  printf "\e[0m\n"
  b=$((b + blue_step))
  row=$((row + 1))
done
printf "\e[0m"
exit 0