#!/bin/bash

#################################################
### This script fills your terminal with colors...

COLS="$(($(tput cols)+1))"
ROWS="$(($(tput lines)+1))"
TOTAL="$((COLS*ROWS))"

ALL_COLORS=(40 41 42 43 44 45 46 47 48)
COLORS=()

getColors() {
   for ((i=0;i<${#ALL_COLORS[*]};i++)); do
      r="$(( $RANDOM % ${#ALL_COLORS[*]} + 0 ))"
      COLORS+=("${ALL_COLORS[$r]}")
   done
}
getColors

setColors() {
      r="$(( $RANDOM % ${#ALL_COLORS[*]} + 1 ))"
      COLORS=("${COLORS[@]:1}")
      COLORS+=("${ALL_COLORS[$r]}")
}

printCol() {
	ROW=$1
	COL=$2
	printf "\e[1;97;$COLOR\e[$[ROW];$[COL]f \e[0m"
}

printColCheck() {
   if [[ "$ra" -gt "0" ]] && [[ "$ca" -gt "0" ]] && [[ "$ra" -le "$ROWS" ]] && [[ "$ca" -le "$COLS" ]] && [[ "$rb" -gt "0" ]] && [[ "$cb" -gt "0" ]] && [[ "$rb" -le "$ROWS" ]] && [[ "$cb" -le "$COLS" ]]; then 
      [[ "$ra" -gt "0" ]] && [[ "$ca" -gt "0" ]] && [[ "$ra" -le "$ROWS" ]] && [[ "$ca" -le "$COLS" ]] && printCol $ra $ca
      [[ "$ra" -gt "0" ]] && [[ "$cb" -gt "0" ]] && [[ "$ra" -le "$ROWS" ]] && [[ "$cb" -le "$COLS" ]] && printCol $ra $cb
      [[ "$rb" -gt "0" ]] && [[ "$ca" -gt "0" ]] && [[ "$rb" -le "$ROWS" ]] && [[ "$ca" -le "$COLS" ]] && printCol $rb $ca
      [[ "$rb" -gt "0" ]] && [[ "$cb" -gt "0" ]] && [[ "$rb" -le "$ROWS" ]] && [[ "$cb" -le "$COLS" ]] && printCol $rb $cb
   fi
}

row=0
col=0

setRanColor() {
	colorrandom="$(( $RANDOM % ${#COLORS[*]} + 0 ))"
	echo "${COLORS[$colorrandom]}m"
}

centerPoints() {
   row=$((ROWS/2+1))
   col=$((COLS/2+1))
	for ((i=0; i<$row; i++)); do
		ra=$(($i+$row))
      rb=$(($row-$i))
      for ((n=0; n<$col; n++)); do
         ca=$(($n+$col))
         cb=$(($col-$n))

         COLOR="$(setRanColor)"
         printColCheck
      done
   done
}

circlePoints() {
   circle="$(( $RANDOM % $(($(tput cols)/3)) + 0 ))"
	row="$(( $RANDOM % ROWS + 1 ))"
	col="$(( $RANDOM % COLS + 1 ))"
	for ((i=0; i<$circle; i++)); do
		ra=$(($i+$row))
      rb=$(($row-$i))
      for ((n=0; n<$circle; n++)); do
         ca=$(($n+$col))
         cb=$(($col-$n))
         COLOR="$(setRanColor)"
         printColCheck 
      done

	done
}

randomPoints() {
	total="$(( $RANDOM % TOTAL + 1 ))"
   for ((i=0;i<$total;i++)); do
      row="$(( $RANDOM % ROWS + 1 ))"
      col="$(( $RANDOM % COLS + 1 ))"
      COLOR="$(setRanColor)"
      printCol $row $col
   done
}


OPTIONS=(randomPoints circlePoints centerPoints)
c=0
while true; do
   setColors
	c="$((c+1))"
   l=$((${#OPTIONS[*]}))
   r="$(( $RANDOM % l + 0 ))"
   ${OPTIONS[$r]}
   sleep 0.1
done