Doug Goodwin douglasgoodwin

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Ruby script to convert stops.txt and shapes.txt to GeoJSON.

	# Try generating RTTY WAV files in Python

	import fileinput
	import wave
	import numpy

	string = ''.join(line for line in fileinput.input())

	baud = 50.0
	tone_duration = 1.0/50.0

	------ Slide 8 ------

	sudo su -
	yum install -y gcc make pkgconfig pcre-devel ncurses-devel
	cd /usr/src
	wget http://repo.varnish-cache.org/source/varnish-3.0.2.tar.gz -O - \| tar xz
	cd varnish-3.0.2
	./configure
	make && make install
	exit

	# LICENSE: public domain

	def calculate_initial_compass_bearing(pointA, pointB):
	"""
	Calculates the bearing between two points.

	The formulae used is the following:
	θ = atan2(sin(Δlong).cos(lat2),
	cos(lat1).sin(lat2) − sin(lat1).cos(lat2).cos(Δlong))

	# Local Dates:
	git log --date=local --pretty=format:"%h%x09%an%x09%ad%x09%s" > commits.local.tsv.txt

	# ISO Dates:
	git log --date=iso --pretty=format:"%h%x09%an%x09%ad%x09%s" > commits.iso.tsv.txt