João Costa joaoffcosta

joaoffcosta / vectorAngle

Created December 4, 2012 16:20

Angle of a vector

	// angle of a vector (defined as AB)
	float R2Point::angle(R2Point A, R2Point B)
	{
	// tg(o) = y / x
	float diffy = B.y - A.y;
	float diffx = B.x - A.x;
	float ang = 0;

	// special case;
	if ((diffy == 0) & (diffx == 0))

joaoffcosta / gist:5728483

Created June 7, 2013 10:42

How to use S3 browser upload using POST form without leaving the page and with error and success handling

	<html>
	<head>
	<title>S3 POST Form</title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	</head>
	<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
	<script type="text/javascript">
	function canAccessIFrame(iframe) {
	var html = null;
	try {

joaoffcosta / gist:5729398

Created June 7, 2013 13:49

How to use S3 browser upload using XMLHttpRequest

	<html>
	<head>
	<title>S3 POST Form</title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<script>
	var bucketName = 'MY_BUCKET_NAME';
	var AWSKeyId = 'MY_AWS_KEY_ID';
	var policy = 'MY_POLICY';
	var signature = 'MY_SIGNATURE';

joaoffcosta / read_file.html

Created July 1, 2013 16:27

Reading a file selected by the user

	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	</head>
	<body>
	<style>
	#progress_bar {
	margin: 10px 0;
	padding: 3px;
	border: 1px solid #000;

joaoffcosta / static_server.js

Last active December 21, 2015 18:29 — forked from ryanflorence/static_server.js

Adds logs, reviews code alignment and fixes path.exists

	var http = require("http");
	var url = require("url");
	var path = require("path");
	var fs = require("fs");
	var port = process.argv[2] \|\| 8000;

	http.createServer(function(request, response) {
	console.log(request["method"] + " " + request["url"]);

	var uri = url.parse(request.url).pathname;

joaoffcosta / heroku_backup_db.sh

Last active August 29, 2015 14:18

Download latest Heroku DB backup

	if [ "$1" = "" ]; then
	echo Missing params: heroku-app-name
	exit 1
	fi

	if [ "$2" = "" ]; then
	echo Missing params: dump-prefix
	exit 1
	fi

joaoffcosta / _quick_psql

Created May 30, 2017 15:32

quick-psql

	#!/usr/bin/env ruby

	require "yaml"

	CONFIG = "~/database.yml"
	CONFIG_PARAMS = %w(protocol host port database username password).map(&:to_sym)

	def say(channel=:info, msg)
	puts "[#{channel.to_s.upcase}] #{msg}"
	end

joaoffcosta / UIColor-TextColor.swift

Created November 19, 2018 14:54

UIColor+TextColor

	import Foundation
	import UIKit

	extension UIColor {
	convenience init(hex: String) {
	let scanner = Scanner(string: hex)
	scanner.scanLocation = 1
	var rgb: UInt64 = 0
	scanner.scanHexInt64(&rgb)
	self.init(rgb: Int(rgb))