Linux World: colorful Christmas Tree on linux terminal

Here is a version 2 of the Christmas tree creation script. The script will create a colorful Christmas tree on the terminal. The colors of the tree will change on every run.

The script will take as input the character with which the tree has to be drawn, and any two characters that have to be used to decorated the tree.

Christmas_tree:

#!/bin/bash

backslash() {
b_st_row=$1
b_st_cols=$2
b_char=$3
deco=$5
b_r_end=$((b_st_row + 5 ))
for((p=b_st_row;p<b_r_end;p++))
do 
tput setaf $4
tput cup $p $b_st_cols
printf "$b_char " 
# sleep 1

if [ $p -eq  $deco ] 
 then 
 temp=$((b_st_cols - 1))
 tput cup $p $temp
 printf "$deco_char1"
 
 temp=$((temp - 2))
 tput cup $p $temp
 printf "$deco_char2"
fi
((b_st_cols++))
done
echo""
}

forward() {
f_st_row=$1
f_st_cols=$2
f_char=$3
deco=$5
f_r_end=$((f_st_row + 5))

for((i=f_st_row;i<f_r_end;i++))
do 
tput cup $i $f_st_cols
tput setaf $4
printf "$f_char "
 
if [ $i -eq  $deco ] 
 then 
 temp=$((f_st_cols + 1))
 tput cup $i $temp
 printf "$deco_char1"
 temp=$((temp + 2))
 tput cup $i $temp
 printf "$deco_char2"
fi
# sleep 1
((f_st_cols--))
done
echo""

}

horizontal() {
hrow=$2
hstart=$1
hcols=$3
char=$4

end=$((hstart + hcols))

for((i=hstart;i<=end;i++))
do 
# sleep 1
tput setaf $5
tput cup $hrow $i
printf "$char" 
done
echo""
}

base(){
start=$1
tput setaf $4
f_st_cols=$((start - 2))
b_st_cols=$((start + 2))
rows=$2
st_row=$((rows+1))
char=$3
forward $st_row $f_st_cols "$char" $4 1000 
backslash $st_row $b_st_cols "$char"  $4 1000
hrow=$((st_row + 4))
hcols=12
hstart=$((start - 6))
horizontal $hstart $hrow $hcols "$char" $4
}

gen_rand() {
num1=$1
#num2=$((num1 + 5))

if [ $num1 -eq 0 ]
then
temp=$(($RANDOM % 2))
rand=$((temp + 2))

else

temp=$(($RANDOM % 5))
rand=$((temp + num1))
fi
}

cols=`tput cols`
start=$((cols/2))
echo "What character do you want to use"
read char
echo "Enter the first character to be used for decoration"
read deco_char1
echo "Enter the second character to be used for decoration"
read deco_char2

tput clear
rows=5
# char="*"

j=1

for((k=0;k<3;k++))
do

st_row=$((k*6))

f_st_cols=$((start - k*3))
color=$RANDOM
color=$((color % 6))
gen_rand $st_row

forward $st_row $f_st_cols "$char" $color $rand

b_st_cols=$((start + k*3))

gen_rand $st_row
backslash $st_row $b_st_cols "$char" $color $rand

hrow=$((j * 5 + k))
hstart=$((5+3*k))
hstart=$((start - hstart))
hcols=$((10 + k*6))
horizontal $hstart $hrow $hcols "$char" $color
((j++))
# deco $st_row $hstart $hcols
done
base $start $hrow "$char" $color

tput setaf 4
tput cup  10 10
printf "**MERRY**"
tput cup 10 90
printf "**CHRISTMAS**"

tput setaf 0
end=$((hrow + 5))

tput cup $end 0

Save the script as christmas_tree.sh, give it execute permission and execute it.

You should see the following image on your screen.