Drawing ASCII graphs!

I found these while digging through some old scripts of mine and thought they were quite cool. There may be some bad old habits in them as I’ve not had time to rewrite them completely, but I had a quick tidy up and thought they were worth sharing.

Each script takes in a csv file as input and “plots” the values as an ASCII graph in the terminal. It’s questionable how useful this actually is, but it’s a bit of fun at least. The SCALE variable controls the amount of characters used for the width of the plot area (not including the table containing labels and values).

Simple: Plot Values of each item

input file: sales

january,140
february,29
march,26
april,54
may,72
june,86

output: ./vgraph sales

 Relative Value Chart

Name      Value (Max is 140)
____________________0_________._________|_________._________|100% (140)
january      140    |========================================
february     29     |========
march        26     |=======
april        54     |===============
may          72     |====================
june         86     |========================

Percentage graph using value and max for each item

input file: stock-list

apples,20,100
pears,40,50
cherries,100,150
mangoes,45,85
tomatoes,30,30

output: ./pgraph stock-list

 Percentage Chart
____________________0_________._________|_________._________|100%
apples       ( 20%) |========
pears        ( 80%) |================================
cherries     ( 66%) |==========================
mangoes      ( 52%) |=====================
tomatoes     (100%) |========================================

And the scripts…. They are both very similar, just some minor tweaks to make them do what I wanted.

vgraph

#!/bin/bash
#
# Value Graph (vgraph)
# Basic ASCII Graphing Tool
#
# Plot values and scale to max
#
# CSV format: Name, Value
#
# Awk isn't perfect at rounding.. .5 rounds down
#
# v1.1 sol@subnetzero.org

if [ -z $1 ]; then
        printf "Usage: pgraph [datafile]\n"
        exit 1
fi

# Set Vars
# FILLER and ENDDELIM are used for drawing bars.
ENDDELIM="="
FILLER="="
SCALE=40
INPUTFILE=$1
NAME=(`awk -F"," '{print $1}' < "$INPUTFILE"`)
TOTAL=(`awk -F"," '{print $2}' < "$INPUTFILE"`)

# Get Max qty for scaling
MAXQTY=0
for VALUE in ${TOTAL[*]}
do
        if [ "$VALUE" -gt "$MAXQTY" ]; then
                MAXQTY=$VALUE
        fi
done

# Make graph header and markings
printf "\n Relative Value Chart\n"
printf "\nName      Value (Max is $MAXQTY)\n"
printf "____________________0"
QTRSCALE=`echo "$SCALE / 4" | bc -l | awk '{printf("%.0f",$0)}'`
HALFSCALE=`echo "$SCALE / 2" | bc -l | awk '{printf("%.0f",$0)}'`
THRSCALE=`echo "$SCALE * 0.75" | bc -l | awk '{printf("%.0f",$0)}'`
LCNT=1
while [ "$LCNT" -le "$SCALE" ];
do
        case $LCNT in
                $QTRSCALE)      printf ".";;
                $HALFSCALE)     printf "|";;
                $THRSCALE)      printf ".";;
                $SCALE)         printf "|100%% ($MAXQTY)\n";;
                *)              printf "_";;
        esac
        LCNT=$(( $LCNT + 1 ))
done

# Draw graph bars
i=0
for ITEM in ${NAME[*]}
do
        # Print Category name in format along with info and bars
        LENGTH=`echo "scale=2;(( ${TOTAL[$i]} / $MAXQTY ) * $SCALE )" |\
                bc |\
                awk '{printf("%.0f",$0)}'`
        printf "%-12.12s %-6.6s |" "$ITEM" "${TOTAL[$i]}"
        BLOCKS=""
        while [ "$LENGTH" -gt "0" ]; do
                if [ "$LENGTH" -eq "1" ]; then
                        BLOCKS="$BLOCKS$ENDDELIM"
                else
                        BLOCKS="$BLOCKS$FILLER"
                fi
                LENGTH=$(( $LENGTH - 1 ))
        done
        printf "$BLOCKS\n"
        i=$(( $i + 1 ))
done
printf "\n\n"

pgraph

#!/bin/bash
#
# PercentageGraph (pgraph)
# Basic ASCII Graphing Tool
#
# CSV format: Name,Used,Total (or Maximum)
#
# Awk isn't perfect at rounding.. .5 rounds down
#
# v1.1 sol@subnetzero.org

if [ -z $1 ]; then
        printf "Usage: pgraph [datafile]\n"
        exit 1
fi

# Set Vars
# FILLER and ENDDELIM are used for drawing bars.
ENDDELIM="="
FILLER="="
SCALE=40
INPUTFILE=$1
NAME=(`awk -F"," '{print $1}' < "$INPUTFILE"`)
USED=(`awk -F"," '{print $2}' < "$INPUTFILE"`)
TOTAL=(`awk -F"," '{print $3}' < "$INPUTFILE"`)

# Get Max qty for scaling
MAXQTY=0
for VALUE in ${TOTAL[*]}
do
        if [ "$VALUE" -gt "$MAXQTY" ]; then
                MAXQTY=$VALUE
        fi
done

echo "max is $MAXQTY"

# Make graph header and markings
printf "\n Percentage Chart\n"
printf "____________________0"
QTRSCALE=`echo "$SCALE / 4" | bc -l | awk '{printf("%.0f",$0)}'`
HALFSCALE=`echo "$SCALE / 2" | bc -l | awk '{printf("%.0f",$0)}'`
THRSCALE=`echo "$SCALE * 0.75" | bc -l | awk '{printf("%.0f",$0)}'`
LCNT=1
while [ "$LCNT" -le "$SCALE" ];
do
        case $LCNT in
                $QTRSCALE)      printf ".";;
                $HALFSCALE)     printf "|";;
                $THRSCALE)      printf ".";;
                $SCALE)         printf "|100%%\n";;
                *)              printf "_";;
        esac
        LCNT=$(( $LCNT + 1 ))
done

# Draw graph bars
i=0
for ITEM in ${NAME[*]}
do
        # Print Category name in format along with info and bars
        LENGTH=`echo "scale=2;(( ${USED[$i]} / ${TOTAL[$i]} ) * $SCALE )" |\
                bc | \
                awk '{printf("%.0f",$0)}'`
        PCT=`echo "scale=2;(( ${USED[$i]} / ${TOTAL[$i]} ) * 100)" |\
             bc |\
             awk '{printf("%.0f",$0)}'`
        printf "%-12.12s (%3.3s%%) |" "$ITEM" "$PCT"
        BLOCKS=""
        while [ "$LENGTH" -gt "0" ]; do
                if [ "$LENGTH" -eq "1" ]; then
                        BLOCKS="$BLOCKS$ENDDELIM"
                else
                        BLOCKS="$BLOCKS$FILLER"
                fi
                LENGTH=$(( $LENGTH - 1 ))
        done
        printf "$BLOCKS\n"
        i=$(( $i + 1 ))
done
printf "\n\n"
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One Response to Drawing ASCII graphs!

  1. Ágoston Péter says:

    Wow, this is awesome! Great job!

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