bash + ImageMagick > 일반 흰색 이미지에 여러 문자열 쓰기 v0.1

코드 v0.1

#!/usr/bin/env bash

# v0.1 Aug. 08, 2018
#   - overlay strings to a white canvas

set -eu  # just in case

OUTFILE="string_180808.png"
WRKFILE="wrk_180808.png"

###########
# CONFIGURATIONS
YPOSS=("30" "60" "90")  # start y positions
STSTRS=("0" "100" "200")  # start strings (ST)
EDSTRS=("100" "200" "300")  # end strings (ED)
UNIT="cm"
FORMSTR="%s to %s%s"  #format of the string using (ST, ED, UNIT)
CANVAS_SIZE="300x100"
FONT_SIZE="20"
###########

#1. prepare canvas
convert -size $CANVAS_SIZE xc:white $WRKFILE 

#2. overlay strings
((maxloop_st0 = ${#YPOSS[*]} - 1))
for idx in $(seq 0 $maxloop_st0)
do
    atxt="$(printf "$FORMSTR" ${STSTRS[idx]} ${EDSTRS[idx]} $UNIT)"
    echo $atxt
    prm="-pointsize $FONT_SIZE -annotate +10+${YPOSS[idx]}"
    convert $prm "$atxt" $WRKFILE $OUTFILE
    mv $OUTFILE $WRKFILE  # for overlay 
done

#3. rename as output
mv $WRKFILE $OUTFILE

#message
echo "[$OUTFILE] is created"

실행

$ bash prepareStringImage_180808_exec 
0 to 100cm
100 to 200cm
200 to 300cm
[string_180808.png] is created

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