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express = require("express")
app = express()

# app configuration etc...

server = http.createServer(app)
server.listen app.get("port"), ->
  console.log "Express server listening on port " + app.get("port")

# REST API and socket.io interface

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long2tile = (lon, zoom) ->
    Math.floor (lon + 180) / 360 * Math.pow(2, zoom)

lat2tile = (lat, zoom) ->
    Math.floor (1 - Math.log(Math.tan(lat * Math.PI / 180) + 1 / Math.cos(lat * Math.PI / 180)) / Math.PI) / 2 * Math.pow(2, zoom)

tile2long = (x, z) ->
    x / Math.pow(2, z) * 360 - 180

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crudsSync = (socket, method, model, options) ->

    if method is 'create'
        socket.once 'create', (data) ->
            model.set data

        socket.emit 'create', model.attributes
    else if method is 'read'
        socket.once 'get', (data) ->

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navigator.geolocation.getCurrentPosition (evt) ->
    formdata = new FormData()
    formdata.append "longitude", evt.coords.longitude
    formdata.append "latitude", evt.coords.latitude
    formdata.append "accuracy", evt.coords.accuracy
    formdata.append "timestamp", evt.timestamp
    req = new XMLHttpRequest()
    req.open("POST", "/location", true)
    req.send(formdata)

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@$(".radio").each (index, elem) ->

    $(elem).on "click", (evt) ->

        if $(elem).hasClass "checked"
            evt.target.checked = false
            $(elem).removeClass "checked"
        else
            evt.target.checked = true
            $(elem).addClass "checked"

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/*
Pass in two WGS84 points as arrays in x y order to calcuate the 
meter distance between them.

distance([longitude1, latitude1], [longitude2, latitude2])

The distance is calculated with the help of the harvesin formula
*/
var distance = function(coords1, coords2) {

ksnabb

form validation

form validation test

A Pen by Kristoffer Snabb on CodePen.

License.

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var http = require("http");

var server = http.createServer(function(req, res) {
  res.end("hello world");
});

server.listen("8090");

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package main

import "net/http"

func handler(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("hello world"))
}

func main() {
	http.HandleFunc("/", handler)

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Canvas image rotation

Drag and drop an image to the canvas which then performs simple rotation on the image.

A Pen by Kristoffer Snabb on CodePen.

License.