.gitignore

@@ -1 +1 @@
-*.png
+testcanvas.png

README.md

@@ -1,23 +0,0 @@
-# griddle
-
-`griddle` is a program for practicing drawing using the [Grid Technique](https://www.art-is-fun.com/grid-method).
-It takes an input image and uses [ImageMagick](https://imagemagick.org) to automatically draw a grid (of specified dimensions) over it.
-
-## Installation
-`griddle` is a shell script; you can copy it to somewhere in your `$PATH` or just clone the repository and execute it.
-
-## Usage
-The CLI interface for `griddle` is `griddle <inputfile> <number_of_columns> <number_of_rows> <outputfile>`.
-This is the number of **columns** and **rows**, not the number of separators.
-For example, specifying "2" columns will result in **one** line splitting the image vertically.
-Border lines around the edge of the image are always generated.
-
-It supports any input and output file formats that ImageMagick supports.
-The input and output files don't need to be the same format; you can input a PNG and output a JPEG, for example.
-
-## Planned Features
-- Generate an additional output image (or PDF?) containing a blank copy of just the generated grid which can be printed out, to save the effort of manually recreating the grid on your drawing paper.
-- Improve the CLI interface with `--options` to remove the arbitrary ordering of `<number_of_columns>` and `<number_of_rows>`.
-- Make border lines optional.
-- Allow the user to adjust the color and transparency of grid lines.
-- Add a default output filename (something like `<inputfilename>_grid.<inputextension>`) if no output filename is explicitly given.

griddle

@@ -1,89 +1,15 @@
 #!/bin/sh
 
-set -e
-
-WIDTH=1
-HEIGHT=2
-
-get_image_dimension() {
-	inputfile="$1"
-	dimension="$2"
-
-	height="$(identify $inputfile | cut -d ' ' -f 3 | cut -d 'x' -f $dimension)"
-	printf "%s" "$height"
-}
-
-generate_lines() {
-	columns="$1"
-	rows="$2"
-
-	width="$3"
-	height="$4"
-
-	# Generate border lines
-	border_width=$((width - 1))
-	border_height=$((height - 1))
-	printf "line 0, 0 0, %d " $border_height
-	printf "line 0, 0 %d, 0 " $border_width
-	printf "line 0, %d %d, %d " $border_height $border_width $border_height
-	printf "line %d, 0 %d, %d " $border_width $border_width $border_height
-
-	# Generate column separators
-	colwidth=$((width / columns))
-	for i in $(seq 1 $columns); do
-		current_colwidth=$((colwidth * i))
-		printf "line %d, 0 %d, %d " $current_colwidth $current_colwidth $height 
-	done
-
-	# Generate row separators
-	rowheight=$((height / rows))
-	for i in $(seq 1 $rows); do
-		current_rowheight=$((rowheight * i))
-		printf "line 0, %d %d, %d " $current_rowheight $width $current_rowheight
-	done
-}
-
-create_image() {
-	inputfile="$1"
-	lines="$2"
-	outputfile="$3"
-
-	convert -draw "$lines" "$inputfile" "$outputfile"
-}
-
 main() {
-	if test "$#" -ne 4; then
-		printf "Usage: griddle <inputfile> <columns> <rows> <outputfile>\n"
+	if test "$#" -ne 2; then
+		echo "Usage: griddle <inputfile> <outputfile>"
 		return 1
 	fi
 
 	inputfile="$1"
-	if ! test -e "$inputfile"; then
-		printf "Input file %s does not exist.\n" "$inputfile"
-		return 2
-	fi
+	outputfile="$2"
 
-	columns="$2"
-	rows="$3"
-
-	outputfile="$4"
-	if test -e "$outputfile"; then
-		printf "Output file $outputfile already exists. Overwrite? (y/N) "
-		read response
-		if ! test "$response" = "y" -o "$response" = "Y"; then
-			printf "Not overwriting $outputfile.\n"
-			return 0
-		else
-			printf "Overwriting $outputfile.\n"
-		fi
-	fi
-
-	width="$(get_image_dimension $inputfile $WIDTH)"
-	height="$(get_image_dimension $inputfile $HEIGHT)"
-
-	lines="$(generate_lines $columns $rows $width $height)"
-
-	create_image "$inputfile" "$lines" "$outputfile"
+	echo "$inputfile" "$outputfile"
 }
 
 main "$@"