typesetting/scripts/colorbar

#!/bin/bash

##This creates a red to blue divergent colorbar with specified label and bounds.
####
#Help
####
Help(){
    echo "This creates a colorbar image file with specified boundaries and tag"
    echo
    echo "Syntax: colorbar [-h|-o outfile|-x width|-y height] caption lobd hibd"
    echo "options:"
    echo "-h: print this help"
    echo "-o: Specify file to write to"
    echo "-x: Specify width of colorbar image. Cannot be used with -y"
    echo "-y: Specify height of colorbar image. Cannot be used with -x"
    echo "caption: Caption for the colorbar"
    echo "lobd: Lower bound of the color bar"
    echo "hibd: Upper bound of the color bar"
}


outfile='colorbar.png'
declare -a args
argnum=0
x=0
y=0
while [ $# -gt 0 ]; do
    unset OPTIND
    unset OPTARG
    #Parse Flags
    while getopts ':ho:x:y:' options; do 
        case $options in
            h)
                Help
                break;;
            o)
                outfile="$OPTARG";;
            x)
                x="$OPTARG"
                if [ $y -ne 0 ]; then
                    echo "Cannot use both -x and -y options"
                    break
                fi
                ;;
            y)
                y="$OPTARG"
                if [ $x -ne 0 ]; then
                    echo "Cannot use both -x and -y options"
                    break
                fi
                ;;
            ?)
                
        esac
    done
    shift $((OPTIND-1))
    args+=("$1")
    (( argnum++ ))
    shift
 done

#Now pull out the required arguments
if [ "$args" = "" ]; then
    Help
elif [ $argnum -ne 3 ]; then 
    echo "colorbar requires three positional arguments, you have supplied $argnum. Please view help"
    echo ${args[0]} ${args[1]}
else
    msg="${args[0]}"
    lobd="${args[1]}"
    hibd="${args[2]}"

    #First copy colorbar file to current directory
    cp ~/typesetting/figure_templates/colorbar.png $outfile

    #Now create lower and upper labels
    convert -background " #FFF " -fill black -font Helvetica -size x196 label:"$lobd" tmp1.png
    convert -background " #FFF " -fill black -font Helvetica -size x196 label:"$hibd" tmp2.png
    convert +append -gravity center tmp1.png $outfile tmp2.png $outfile

    #Now create caption for image
    convert -background " #FFF " -fill black -font Helvetica -size x196 label:"$msg" tmp.png
    convert -append -gravity center tmp.png $outfile $outfile

    #Final step is resizing
    if [ $x -gt 0 ]; then
        convert -scale "$x"x $outfile $outfile
    fi
    if [ $y -gt 0 ]; then
        convert -scale x"$y" $outfile $outfile
    fi
    rm tmp.png tmp1.png tmp2.png
    
fi