Click here to Skip to main content
15,617,116 members
Articles / All Topics
Technical Blog
Posted 11 Sep 2014

Tagged as


3 bookmarked

Paper Effect Google Maps

Rate me:
Please Sign up or sign in to vote.
5.00/5 (2 votes)
11 Sep 2014CPOL3 min read
Paper effect Google maps

A friend of mine Marlon Grech, has his own business and he has a nice parallax effect web site: and over there on his “contact us2 page, it has this very cool folding Google maps thing. I have wondered how it was done for a while now, today I decided to find out. A colleague of mine was like WHY!….Ashic if you are reading this, sorry but I think it is cool, but I promise you I will be back to trying to slay the world with sockets tomorrow, a slight distraction shall we say.

Not Really My Idea – Credit Where Credit Is Due

Now the code I present in this post is not my own at all, I have added the ability to toggle the folding of the map, but that really is all I have done. None the less, I think it is still of interest to describe how it was done, and worth a small write up. I think the original authors have done a great job, but did not really explain anything, so hopefully by the time you get to the end of this post, the effect will be a bit more familiar to you.

The original code that forms the basis to this post is here:

The Basic Idea

The idea is actually not too hard to grasp. There is a master DIV, which contains the actual Google map, this DIV has a VERY low opacity, so low you can’t actually see it. Then there are 6 other DIVs that get a slice of the original DIV, this is done by some clever margins, as can be seen in this image and the code that follows it:


The relevant HTML is here:

<!doctype html> 
<html lang="en">
    <meta charset="UTF-8"> 
    <title>Folding google maps</title>
    <link rel="stylesheet" type="text/css" href="style.css">
    <script src=""></script>
    <script src="//"></script>
    <script src="script.js"></script>
    <!–[if lt IE 9]>
    <script src=""></script>
        <a href="/foldedmap/" id="prev">Click to toggle</a> 
        <p>Folded Google Maps (Webkit only)</p> 
    <div id="map_master"></div>
    <div id="container">
        <div id="mapContainer1" class="mapContainer odd first"></div>
        <div id="mapContainer2" class="mapContainer even"></div>
        <div id="mapContainer3" class="mapContainer odd"></div>
        <div id="mapContainer4" class="mapContainer even"></div>
        <div id="mapContainer5" class="mapContainer odd"></div>
                        <div id="mapContainer6" class="mapContainer even last"></div>

Each of these slices is a fixed width of 160px and a height of 400px. The overflow is also hidden, that part is important, as will see in just a minute. The relevant CSS is here:

.mapContainer {
    width: 160px;
    height: 400px;
    overflow: hidden;
    border-top: 10px solid #fff;
    border-bottom: 10px solid #fff;
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    -ms-transform-style: preserve-3d;
    -o-transform-style: preserve-3d;
    transform-style: preserve-3d;
    box-shadow:0px 4px 0 #10335C;

Each slice of the original gets a certain margin applied, where the overflow for the 6 DIVS is hidden. So by moving the slice into the desired position by way of clever margin positioning the remaining portion of the map for that slice would not be seen, thanks to overflow being hidden. Sneaky!

mapSync: function() {
    var map_clone = $('#map_master').clone().css('opacity',1).css('z-index',-1);

The next part of the trick is to apply some web kit 3D transforms. This is done inside a Timeout function so it happens every 10 milliseconds, up to/down from some predetermined values.

Here is the code that applies the transforms:

applyTransforms: function () {
    var prefixes = ['webkit', 'moz', 'ms', 'o', ''];
    for(i in prefixes) {
        $('.odd').css(prefixes[i] + 'Transform', 'rotateX(' +
            this.rotateX + 'deg) rotateY(' + -this.rotateY + 'deg)');
        $('.even').css(prefixes[i] + 'Transform', 'rotateX(' +
            this.rotateX + 'deg) rotateY(' + this.rotateY + 'deg)');
        -160 * (1 – Math.cos(this.rotateY / 360 * 2 * Math.PI)) + 'px');

It can be seen above that the applying of the transforms is done for each of the vendor specific flavours, Mozilla, Webkit, etc.

The code below unfolds/folds the 6 DIVS by calling he applyTransforms function outlined above.

unfoldMap: function () {
    if(this.rotateY > 20)
        this.rotateY -= 0.5;
        this.rotateX += 0.1;
        this.isOpen = true;

foldMap: function () {
    if(this.rotateY < 90)
        this.rotateY += 0.5;
        this.rotateX -= 0.1;
        this.isOpen = false;

Anyway like I say, the code is pretty much as seen in the original link, all I added was the ability to toggle between a unfolded map back to a folded one.

Though I have added a bit more of an explanation, so hopefully it added some value.

Where Is The Code?

Anyway, if you want a small demo project I have created one for VS2013, that you can grab from GitHub here:

IOS Code Like This

My old WPF Disciple buddy Colin Eberhardt has a similar post using Objective C for IOS development. May be of interest to some of you:

Image 2 Image 3


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By
Software Developer (Senior)
United Kingdom United Kingdom
I currently hold the following qualifications (amongst others, I also studied Music Technology and Electronics, for my sins)

- MSc (Passed with distinctions), in Information Technology for E-Commerce
- BSc Hons (1st class) in Computer Science & Artificial Intelligence

Both of these at Sussex University UK.


I am lucky enough to have won a few awards for Zany Crazy code articles over the years

  • Microsoft C# MVP 2016
  • Codeproject MVP 2016
  • Microsoft C# MVP 2015
  • Codeproject MVP 2015
  • Microsoft C# MVP 2014
  • Codeproject MVP 2014
  • Microsoft C# MVP 2013
  • Codeproject MVP 2013
  • Microsoft C# MVP 2012
  • Codeproject MVP 2012
  • Microsoft C# MVP 2011
  • Codeproject MVP 2011
  • Microsoft C# MVP 2010
  • Codeproject MVP 2010
  • Microsoft C# MVP 2009
  • Codeproject MVP 2009
  • Microsoft C# MVP 2008
  • Codeproject MVP 2008
  • And numerous codeproject awards which you can see over at my blog

Comments and Discussions

Questionreally nice but let see further :) Pin
realhabs18-Aug-15 22:19
realhabs18-Aug-15 22:19 
QuestionCu---te Pin
jediYL15-Sep-14 15:16
professionaljediYL15-Sep-14 15:16 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.