Add genimagecomparisonframes

README.md

@@ -26,6 +26,7 @@ Here's a list of the most interesting ones, along with what they do and where th
  - [micro](https://github.com/zyedidia/micro) - A new (experimental) terminal-based text editor.
  - [tig](http://jonas.nitro.dk/tig/) - A terminal-based git repository browser.
  - backup - A script I wrote to make using Duplicity easier.
+ - genimagecomparisonframes - Another script I wrote to generate the frames for the first half of [this video](https://starbeamrainbowlabs.com/blog/images/20160525-Tessellator-Comparison.webm).
 
 ## Disclaimer
 I don't own many of the tools in this repository. If you are an owner of one of these tools and I haven't linked to you, please let me know as I probably forgot.

genimagecomparisonframes

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+if [[ "$#" -ne 4 ]]
+then
+	echo Side by side image generator
+	echo By Starbeamrainbowlabs
+	echo -e "\nUsage:"
+	echo "    ./genframes.sh [leftimage.ext] [rightext.ext] [step] [outdir]" 
+	echo -e "\nNote that the output directory should *not* contain the trailing slash."
+	exit
+fi
+
+i=0
+step="$3"
+
+imwidth=1680
+imheight=1050
+
+leftimage="$1"
+rightimage="$2"
+
+outdirprefix="$4/"
+
+frame=0
+while [ $(echo "$i <= 1" | bc) -eq 1 ]
+do
+	nextoffset=$(calc -p "(${imwidth} / 2) * ${i}")
+	
+	leftpixcount=$(calc -p "$i * $imwidth")
+	rightpixcount=$(calc -p "$imwidth - $leftpixcount")
+	
+	framefilename=${outdirprefix}$(printf "%03d" "$frame").jpeg
+	
+	echo $frame: $leftpixcount / $rightpixcount $framefilename
+	
+	if [[ $(echo "$leftpixcount == 0" | bc) -eq 1 ]]
+	then
+		cp $rightimage $framefilename
+	elif [[ $(echo "$rightpixcount == 0" | bc) -eq 1 ]]
+	then
+		cp $leftimage $framefilename
+	else
+		convert $leftimage -crop ${leftpixcount}x${imheight}+0+0 $rightimage -crop ${rightpixcount}x${imheight}+$leftpixcount+0 +append "$framefilename"
+	fi
+	
+	frame=$(calc -p "$frame + 1")
+	i=$(calc -p "$i + $step")
+done
+
+