#!/bin/bash # # Developed by Fred Weinhaus 9/23/2012 .......... revised 4/25/2015 # # ------------------------------------------------------------------------------ # # Licensing: # # Copyright © Fred Weinhaus # # My scripts are available free of charge for non-commercial use, ONLY. # # For use of my scripts in commercial (for-profit) environments or # non-free applications, please contact me (Fred Weinhaus) for # licensing arrangements. My email address is fmw at alink dot net. # # If you: 1) redistribute, 2) incorporate any of these scripts into other # free applications or 3) reprogram them in another scripting language, # then you must contact me for permission, especially if the result might # be used in a commercial or for-profit environment. # # My scripts are also subject, in a subordinate manner, to the ImageMagick # license, which can be found at: http://www.imagemagick.org/script/license.php # # ------------------------------------------------------------------------------ # #### # # USAGE: radialgradient WidthxHeight [-d diameters] [-c center] [-C colors] outfile # USAGE: radialgradient [-h or -help] # # OPTIONS: # # WidthxHeight width and height of desired output image # -d diameters x and y diameters of radial gradient; # pair of comma separated floats>=0; # default=Width,Height # -c center x and y center coordinates for radial gradient; # pair of comma separated floats>=0; # default=Width/2,Height/2 # -C colors inner and outer colors for radial gradient; # hyphen separate pair of IM colors; # default="black-white"; be sure to enclose them # in quotes. # ### # # NAME: RADIALGRADIENT # # PURPOSE: To create a radial gradient image. # # DESCRIPTION: RADIALGRADIENT create a radial gradient image. The user can # specify the x and y diameters and the x and y center coordinates. Nominally, # the center will be black and increase in brightness to white at the radii # (half diameters) from the center. # # # ARGUMENTS: # # WidthxHeight ... WIDTHxHEIGHT is the desired sized of the output image. # # -d diameters ... DIAMETERS are the x and y diameters for the radial gradient. # Values are floats>=0. The default=Width,Height. # # -c center ... CENTER is the x and y center coordinates for the radial gradient. # Values are floats>=0. The default=Width/2,Height/2. # # -C colors ... COLORS are the inner and outer limit colors of the radial # gradient. They are specified as a hyphen separate pair of valid IM colors. # The default="black-white". Be sure to enclose them in quotes. # # CAVEAT: No guarantee that this script will work on all platforms, # nor that trapping of inconsistent parameters is complete and # foolproof. Use At Your Own Risk. # ###### # # set default values #size="" #WxH diameters="" #default=WxH center="" #default=(W/2)x(H/2) colors="black-white" #any valid IM hyphen separated colors # set directory for temporary files dir="." # suggestions are dir="." or dir="/tmp" # set up functions to report Usage and Usage with Description PROGNAME=`type $0 | awk '{print $3}'` # search for executable on path PROGDIR=`dirname $PROGNAME` # extract directory of program PROGNAME=`basename $PROGNAME` # base name of program usage1() { echo >&2 "" echo >&2 "$PROGNAME:" "$@" sed >&2 -e '1,/^####/d; /^###/g; /^#/!q; s/^#//; s/^ //; 4,$p' "$PROGDIR/$PROGNAME" } usage2() { echo >&2 "" echo >&2 "$PROGNAME:" "$@" sed >&2 -e '1,/^####/d; /^######/g; /^#/!q; s/^#*//; s/^ //; 4,$p' "$PROGDIR/$PROGNAME" } # function to report error messages errMsg() { echo "" echo $1 echo "" usage1 exit 1 } # function to test for minus at start of value of second part of option 1 or 2 checkMinus() { test=`echo "$1" | grep -c '^-.*$'` # returns 1 if match; 0 otherwise [ $test -eq 1 ] && errMsg "$errorMsg" } # test for correct number of arguments and get values if [ $# -eq 0 ] then # help information echo "" usage2 exit 0 elif [ $# -gt 8 ] then errMsg "--- TOO MANY ARGUMENTS WERE PROVIDED ---" else while [ $# -gt 0 ] do # get parameter values case "$1" in -h|-help) # help information echo "" usage2 exit 0 ;; -d) # get diameters shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID DIAMETERS SPECIFICATION ---" checkMinus "$1" diameters=`expr "$1" : '\([.0-9]*,[.0-9]*\)'` [ "$diameters" = "" ] && errMsg "--- DIAMETERS=$diameters MUST BE A COMMA SEPARATED PAIR OF NON-NEGATIVE FLOATS ---" ;; -c) # get center shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID CENTER SPECIFICATION ---" checkMinus "$1" center=`expr "$1" : '\([.0-9]*,[.0-9]*\)'` [ "$center" = "" ] && errMsg "--- CENTER=$center MUST BE A COMMA SEPARATED PAIR OF NON-NEGATIVE FLOATS ---" ;; -C) # get colors shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID COLORS SPECIFICATION ---" checkMinus "$1" colors=`echo "$1" | tr "[:upper:]" "[:lower:]"` [ "$colors" = "" ] && errMsg "--- COLORS=$colors MUST BE A HYPHEN SEPARATED PAIR OF IM VALID COLORS ---" ;; [0-9]*x[0-9]*) # get width x height size="$1" ;; -) # STDIN and end of arguments break ;; -*) # any other - argument errMsg "--- UNKNOWN OPTION ---" ;; *) # end of arguments break ;; esac shift # next option done # # get outfile outfile="$1" fi # test that outfile provided [ "$outfile" = "" ] && errMsg "--- NO OUTPUT FILE SPECIFIED ---" # test that size specified [ "$size" = "" ] && errMsg "--- NO OUTPUT SIZE SPECIFIED ---" # set temporary file tmpA1="$dir/radialgradient_A_$$.mpc" tmpA2="$dir/radialgradient_A_$$.cache" trap "rm -f $tmpA1 $tmpA2;" 0 trap "rm -f $tmpA1 $tmpA2; exit 1" 1 2 3 15 trap "rm -f $tmpA1 $tmpA2; exit 1" ERR # extract individual arguments ww=`echo "$size" | cut -dx -f 1` hh=`echo "$size" | cut -dx -f 2` if [ "$diameters" = "" ]; then dx=$ww dy=$hh else dx=`echo $diameters | cut -d, -f 1` dy=`echo $diameters | cut -d, -f 2` fi if [ "$center" = "" ]; then cx=`convert xc: -format "%[fx:$ww/2]" info:` cy=`convert xc: -format "%[fx:$hh/2]" info:` else cx=`echo $offsets | cut -d, -f 1` cy=`echo $offsets | cut -d, -f 2` fi # create black-white radial-gradient convert \ \( -size ${ww}x1 xc: -fx "xx=(i-$cx)/($dx/2); xx^2" -scale ${ww}x${hh}! \) \ \( -size 1x${hh} xc: -fx "yy=(j-$cy)/($dy/2); yy^2" -scale ${ww}x${hh}! \) \ -compose plus -composite -evaluate pow 0.5 \ $tmpA1 # colorize as needed if [ "$colors" != "black-white" ]; then colors=`echo "$colors" | tr "-" ","` color1=`echo "$colors" | cut -d, -f 1` color2=`echo "$colors" | cut -d, -f 2` is_opaque1=`convert xc:"$color1" -format "%[fx:u.a]" info:` is_opaque2=`convert xc:"$color2" -format "%[fx:u.a]" info:` if [ $is_opaque1 -eq 1 -a $is_opaque2 -eq 1 ]; then #fully opaque colors convert $tmpA1 +level-colors "$colors" "$outfile" else #some transparency in colors convert $tmpA1 \( -clone 0 -negate \) \( -clone 0 +level-colors $colors \) \ -delete 0 +swap -alpha off -compose copy_opacity -composite \ $outfile fi else convert $tmpA1 "$outfile" fi exit 0