likev’s gists

adammiller / douglasPeucker.js

Created February 14, 2011 16:54

Javascript implementation of the Douglas Peucker path simplification algorithm

	var simplifyPath = function( points, tolerance ) {

	// helper classes
	var Vector = function( x, y ) {
	this.x = x;
	this.y = y;

	};
	var Line = function( p1, p2 ) {
	this.p1 = p1;

revolunet / lzw_encoder.js

Created February 25, 2011 14:55

LZW javascript compress/decompress

1999 / grayscale.js

Created March 6, 2012 07:44

HTML5 grayscale images

	function grayscale(src) {
	var canvas = document.createElement("canvas"),
	ctx = canvas.getContext("2d"),
	imgPixels, x, y, i, avg;

	var imgObj = new Image();
	imgObj.src = src;

	canvas.width = imgObj.width;
	canvas.height = imgObj.height;

crofty / index.html

Last active October 1, 2025 21:28

A example of using Google Map tiles with the Leaflet mapping library - http://matchingnotes.com/using-google-map-tiles-with-leaflet

	<!DOCTYPE html>
	<html>
	<head>
	<title>Leaflet</title>
	<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.3.1/leaflet.css" />
	<script src="http://cdn.leafletjs.com/leaflet-0.3.1/leaflet.js"></script>
	<script src="http://maps.google.com/maps/api/js?v=3.2&sensor=false"></script>
	<script src="http://matchingnotes.com/javascripts/leaflet-google.js"></script>
	</head>
	<body>

jboner / latency.txt

Last active April 3, 2026 06:12

Latency Numbers Every Programmer Should Know

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

axelpale / combinations.js

Last active October 11, 2025 20:04

JavaScript functions to calculate combinations of elements in Array.

	/**
	* Copyright 2012 Akseli Palén.
	* Created 2012-07-15.
	* Licensed under the MIT license.
	*
	* <license>
	* Permission is hereby granted, free of charge, to any person obtaining
	* a copy of this software and associated documentation files
	* (the "Software"), to deal in the Software without restriction,
	* including without limitation the rights to use, copy, modify, merge,

motonacciu / gist:3172970

Created July 24, 2012 22:00

	// Define a type which holds an unsigned integer value
	template<std::size_t> struct int_{};

	template <class Tuple, size_t Pos>
	std::ostream& print_tuple(std::ostream& out, const Tuple& t, int_<Pos> ) {
	out << std::get< std::tuple_size<Tuple>::value-Pos >(t) << ',';
	return print_tuple(out, t, int_<Pos-1>());
	}

	template <class Tuple>

balupton / cors.js

Created September 11, 2012 05:21

Acheiving CORS via a Node HTTP Server

	// Create our server
	var server;
	server = http.createServer(function(req,res){
	// Set CORS headers
	res.setHeader('Access-Control-Allow-Origin', '*');
	res.setHeader('Access-Control-Request-Method', '*');
	res.setHeader('Access-Control-Allow-Methods', 'OPTIONS, GET');
	res.setHeader('Access-Control-Allow-Headers', '*');
	if ( req.method === 'OPTIONS' ) {
	res.writeHead(200);

matsadler / project.js

Created October 7, 2012 20:29

JavaScript mercator projection

	/jslint vars: true /
	// adapted from http://wiki.openstreetmap.org/wiki/Mercator#JavaScript

	(function () {
	var project = {};

	if (typeof exports === "object") {
	module.exports = project;
	} else {
	this.project = project;

6174 / Random-string

Created July 23, 2013 13:36

Generate a random string in JavaScript In a short and fast way!

	//http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript
	Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15);

xufanglu likev