ChickenProp

The Liang-Barsky algorithm is a cheap way to find the intersection points between a line segment and an axis-aligned rectangle. It's a simple algorithm, but the resources I was pointed to didn't have particularly good explanations, so I tried to write a better one.

Consider a rectangle defined by x_min ≤ x ≤ x_max and y_min ≤ y ≤ y_max, and a line segment from (x_0, y_0) to (x_0 + Δ_x, y_0 + Δ_y). We'll be assuming at least one of Δ_x and Δ_y is nonzero.

(I'm working with Flash, so I'll be using the convention that y increases as you go down.)

We want to distinguish between the following cases:

tmathews

For more information see:

• http://board.flashkit.com/board/showthread.php?t=541469
• http://math.stackexchange.com/questions/76457/check-if-a-point-is-within-an-ellipse

pointInEllipse(test, center, width, height) {
	dx = test.x - center.x
	dy = test.y - center.y
	return ( dx * dx ) / ( width * width ) + ( dy * dy ) / ( height * height ) <= 1
}

zziuni

# source : http://code.google.com/p/natvpn/source/browse/trunk/stun_server_list
# A list of available STUN server.

stun.l.google.com:19302
stun1.l.google.com:19302
stun2.l.google.com:19302
stun3.l.google.com:19302
stun4.l.google.com:19302
stun01.sipphone.com
stun.ekiga.net

masonforest

Installing a Gem on Heroku from a Private GitHub Repo

Sometimes you want to use a gem on Heroku that is in a private repository on GitHub.

Using git over http you can authenticate to GitHub using basic authentication. However, we don't want to embed usernames and passwords in Gemfiles. Instead, we can use authentication tokens.

1. Get an OAuth Token from GitHub

---

First you will need to get an OAuth Token from GitHub using your own username and "note"

ndarville

Business Models

Advertising

Models	Examples
Display ads	Yahoo!
Search ads	Google

mbostock

license: gpl-3.0
redirect: https://observablehq.com/@d3/d3-color-schemes

greenido

/*************************************************
 * This is a simple Monte Carlo simulation to see 
 * whether we should 
 * go for X BIG deal and/or Y SMALL deals. 
 * 
 * What is the best blend?
 *
 * Author: Ido Green | plus.google.com/+greenido
 * Date: 16 July 2013
 * 

madmo

func HttpConnect(proxy, url_ string) (io.ReadWriteCloser, error) {
	p, err := net.Dial("tcp", proxy)
	if err != nil {
		return nil, err
	}

	turl, err := url.Parse(url_)
	if err != nil {
		return nil, err
	}

kevin-smets

Default

Powerlevel10k

mattes

#cloud-config

write_files:
  - path: /home/core/journal2logentries.sh
    permissions: '0744'
    owner: root:root
    content: |
      #!/usr/bin/env bash
      # CoreOS on Google Compute Engine: push systemd journal logs to logentries.com
      # get your private token from logentries.com, see https://logentries.com/doc/input-token