animation/stipple_sine.sh

#!/bin/bash

###########################
#
# Run the stipple_gen script on a sequence
# of PNG images and then render the resulting
# preview images into a video. Fluctuate settings
# via a sine wave.
#
###########################

if [[ "${1}" == "" ]]; then
	echo "Please provide a directory of images as the first argument"
	exit 1
fi

INPUT=`realpath "${1}"`
OUTPUT=`realpath "${2}"`
CONFIG="${3}"
SINGLE="${4}"

if [ ! -d "${INPUT}" ]; then
	echo "Directory ${1} doesn't exist"
	exit 2
fi

mkdir -p "${OUTPUT}"

PI=3.14159265359
FPS=24
MULTIPLE=3
STEP=$(echo "scale=6;360/45" | bc -l)
AMP=1.0
STARTANGLE=270

RATE=`echo "scale=0;${FPS}/${MULTIPLE}" | bc`

WIDTH=404
HEIGHT=374

DOTSIZE_MIN=1.8
DOTSIZE_MAX=6
DOTSIZE_HALF=`echo "scale=6;($DOTSIZE_MAX - $DOTSIZE_MIN) / 2" | bc`
DOTSIZE=`echo "scale=6;($DOTSIZE_MIN + $DOTSIZE_HALF)" | bc`
DOTSIZE_MULTIPLE=$DOTSIZE_HALF
PARTICLES_MIN=200
PARTICLES_MAX=1000
PARTICLES_HALF=`echo "($PARTICLES_MAX - $PARTICLES_MIN) / 2" | bc`
PARTICLES=$((PARTICLES_MIN+PARTICLES_HALF))
PARTICLES_MULTIPLE=$PARTICLES_HALF

if [[ "${CONFIG}" == "" ]]; then
	echo "Please provide a config file"
	exit 1
fi

IMAGES=""

fluctuation () {
	i=$1
	ANGLE=$(echo "scale=6;$STARTANGLE+($i * $STEP)" | bc)
	FLUCTUATION=$(echo "scale=6;s($ANGLE*($PI/180))*$AMP" | bc -l)
	echo $FLUCTUATION
}

stipple () {
	png="${1}"
	frame="${2}"
	filename=`basename "${png}"`
	name=`echo "${filename}" | cut -d'.' -f1`
	num=`echo "${name}" | awk -F'_' '{print $(NF)}'`
	tmp=`mktemp`.png
	fluc=`fluctuation $frame`
	particles=`echo "scale=0;($PARTICLES-($fluc*$PARTICLES_MULTIPLE))/1" | bc`
	dotsize=`echo "scale=6;$DOTSIZE+($fluc*$DOTSIZE_MULTIPLE)" | bc`
	#echo $fluc 
	echo "maxParticles: $particles"
	echo "dotSizeFactor: $dotsize"

	bash white.sh "${png}" "${tmp}"

	source "${CONFIG}"

	cd ~/src/stipple_gen/
	bash stipple_gen.sh \
		--inputImage "${tmp}" \
		--outputImage "${OUTPUT}/${name}_rendered.png" \
		--outputSVG "${OUTPUT}/${name}.svg" \
		--config "${CONFIG}" \
		--dotSizeFactor $dotsize \
		--maxParticles $particles

	if [[ "${invert}" == "true" ]]; then
		convert "${OUTPUT}/${name}_rendered.png" -channel RGB -negate "${OUTPUT}/${name}_rendered.png"
	fi

	rm "${tmp}"
	cd ~/src/animation/

	if [ "${MODE}" != "tsp" ]; then
		opt=`mktemp`.svg
		CURRENT=$(pwd)
		cd /
		svgsort --no-adjust "${OUTPUT}/${name}.svg" "${opt}"
		cd $CURRENT
		mv "${opt}" "${OUTPUT}/${name}.svg"
	fi
}

if [[ "${SINGLE}" != "" ]]; then 
	i=0;
	echo "Rendering a single frame, #${SINGLE}"
	#files in dir
	for png in "${INPUT}/"*.png ; do
		if [[ ${i} -eq ${SINGLE} ]]; then
			stipple "${png}" ${i}
			break
		fi
		i=$((i+1))
	done

	exit
fi

i=0;
#files in dir
for png in "${INPUT}/"*.png ; do
	stipple "${png}" ${i}
	i=$((i+1))
done

if [[ "${IMAGES}" == "" ]]; then
	part=`echo "${name}" | awk -F'_0' '{print $1}'`
	IMAGES="${OUTPUT}/${part}_%06d_rendered.png"
	VIDEO="${OUTPUT}/${part}.mov"
fi

ffmpeg -y -r ${RATE} -f image2 -i "${IMAGES}" \
	-r ${FPS} \
	-c:v prores_ks -profile:v 3 \
	"${VIDEO}"