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HTML5 Game Development by Example(Second Edition)
HTML5 Game Development by Example(Second Edition)

HTML5 Game Development by Example(Second Edition): Make the most of HTML5 techniques to create exciting games from scratch

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HTML5 Game Development by Example(Second Edition)

Chapter 2. Getting Started with DOM-based Game Development

We've got an idea about what we are going to learn in the whole book in Chapter 1, Introducing HTML5 Games. From this chapter onwards, we will go through a lot of learning-by-doing sections, and we will focus on one topic in each section. Before digging deeply into the cutting-edge CSS3 animations and HTML5 Canvas game, let's start with traditional DOM-based game development. We will warm up with some basic techniques in this chapter.

In this chapter, we will be:

  • Setting up our first game—Ping Pong
  • Learning basic positioning with the jQuery JavaScript library
  • Getting mouse inputs
  • Creating the Ping Pong game that displays the scores
  • Learning to separate data and view rendering logic

We will create a Ping Pong game that a player plays against the computer via mouse input. You can try the game at http://makzan.net/html5-games/pingpong/.

The following screenshot shows the look of the game at the end of this chapter...

Preparing the HTML documents for a DOM-based game

Every website, web page, and HTML5 game starts with a default HTML document. Moreover, the document starts with a basic HTML code. We will start our HTML5 game development journey with index.html.

Time for action – installing the jQuery library

We will create our HTML5 Ping Pong game from scratch. It may sound as if we are going to be preparing all the things ourselves. Luckily, we can use a JavaScript library to help us. jQuery is the JavaScript library that is designed to navigate the DOM elements easily, manipulate them, handle events, and create an asynchronous remote call. We will be using this library in the book to manipulate DOM elements. It will help us to simplify our JavaScript logic:

  1. Create a new folder named pingpong as our project directory.
  2. Inside the pingpong folder, we will create the following file structure, with three folders—js, css, and images—and an index.html file:
    index.html
    js/
      js/pingpong.js
    css/
      css/pingpong.css
    images/
  3. Now, it's time to download the jQuery library. Go to http://jquery.com/.
  4. Select Download jQuery and click on Download the compressed, production jQuery 2.1.3.
  5. Save jquery-2.1.3.min.js within the js folder that...

Setting up the Ping Pong game elements

We have made the preparations, and now it's time to set up the Ping Pong game. The following graph shows how we place the game elements. The game element contains our playground and later the scoreboard. Inside the playground, we place two decorative elements, namely paddle hand, which acts as the handle of the soccer machine. Then, we have two paddle elements—one on the left and one on the right.

Setting up the Ping Pong game elements

Time for action – placing Ping Pong game elements in the DOM

  1. We will continue from our jQuery installation example, and open the index.html file in a text editor.
  2. Then, we will create the following playground and game objects with DIV nodes in the body. There are two paddles and one ball inside the playground, and the playground is placed inside the game:
    <div id="game">
      <div id="playground">
        <div class="paddle-hand right"></div>
        <div class="paddle-hand left"></div>
        <div id="paddleA" class="paddle"></div>
        <div id="paddleB" class="paddle"></div>
        <div id="ball"></div>
      </div>
    </div>
  3. We now have the structure of the game object ready, and it is time to apply styles to them. We will add the following styles to the pingpong.css file:
    #game {
      position: relative;
      width: 400px;
      height: 200px...

Getting mouse input

You learned how to display game objects with CSS and jQuery in the previous sections. The next thing we need to create in the game is a way to get input from the players. We will discuss about the mouse input in this section.

Time for action – moving DOM objects by mouse input

We are going to create a traditional Ping Pong game. There is a paddle on both the left and right sides of the playground. A ball is placed in the middle of the playground. Players can control the right paddle and move it up and down by using the mouse. We will focus on the mouse input and leave the ball movement for a later section:

  1. Let's continue with our pingpong directory.
  2. Next, add a playground object inside the pingpong data object in the js/pingpong.js file. This stores variables that are related to playground:
    // data definition
    var pingpong = {
      paddleA: {
        x: 50,
        y: 100,
        width: 20,
        height: 70
      },
      paddleB: {
        x: 320,
        y: 100,
        width: 20,
        height: 70
      },
      playground: {
        offsetTop: $("#playground").offset().top,
      }
    };
  3. Then, create the following function that handles the mouse's enter, move, and leave events, and place it inside the js/pingpong.js file:
    function handleMouseInputs...

Time for action – Moving the ball with JavaScript Interval

We will use the function to create a timer. The timer moves the ball a little bit every 30 milliseconds. We are going to also change the direction of the ball movement once it hits the playground edge. Let's make the ball move now:

  1. We will use our last example, listening to multiple keyboard inputs, as the starting point.
  2. Open the js/pingpong.js file in the text editor.
  3. In the existing pingpong.playground object, we change to the following code that adds height and width to the playground.
    playground: {
      offsetTop: $("#playground").offset().top,
      height: parseInt($("#playground").height()),
      width: parseInt($("#playground").width()),
    },
  4. We are now moving the ball, and we need to store the ball's status globally. We will put the ball-related variable inside the pingpong object:
    var pingpong = {
      //existing data
      ball: {
        speed: 5,
        x: 150,
        y: 100,
        directionX: 1,
        directionY...

Preparing the HTML documents for a DOM-based game


Every website, web page, and HTML5 game starts with a default HTML document. Moreover, the document starts with a basic HTML code. We will start our HTML5 game development journey with index.html.

Time for action – installing the jQuery library


We will create our HTML5 Ping Pong game from scratch. It may sound as if we are going to be preparing all the things ourselves. Luckily, we can use a JavaScript library to help us. jQuery is the JavaScript library that is designed to navigate the DOM elements easily, manipulate them, handle events, and create an asynchronous remote call. We will be using this library in the book to manipulate DOM elements. It will help us to simplify our JavaScript logic:

  1. Create a new folder named pingpong as our project directory.

  2. Inside the pingpong folder, we will create the following file structure, with three folders—js, css, and images—and an index.html file:

    index.html
    js/
      js/pingpong.js
    css/
      css/pingpong.css
    images/
  3. Now, it's time to download the jQuery library. Go to http://jquery.com/.

  4. Select Download jQuery and click on Download the compressed, production jQuery 2.1.3.

  5. Save jquery-2.1.3.min.js within the js folder that we created in step 2.

  6. Open index...

Setting up the Ping Pong game elements


We have made the preparations, and now it's time to set up the Ping Pong game. The following graph shows how we place the game elements. The game element contains our playground and later the scoreboard. Inside the playground, we place two decorative elements, namely paddle hand, which acts as the handle of the soccer machine. Then, we have two paddle elements—one on the left and one on the right.

Time for action – placing Ping Pong game elements in the DOM


  1. We will continue from our jQuery installation example, and open the index.html file in a text editor.

  2. Then, we will create the following playground and game objects with DIV nodes in the body. There are two paddles and one ball inside the playground, and the playground is placed inside the game:

    <div id="game">
      <div id="playground">
        <div class="paddle-hand right"></div>
        <div class="paddle-hand left"></div>
        <div id="paddleA" class="paddle"></div>
        <div id="paddleB" class="paddle"></div>
        <div id="ball"></div>
      </div>
    </div>
  3. We now have the structure of the game object ready, and it is time to apply styles to them. We will add the following styles to the pingpong.css file:

    #game {
      position: relative;
      width: 400px;
      height: 200px;
    }
    #playground{
      background: url(../images/playground.png);
      background-size: contain;
      width:...

Getting mouse input


You learned how to display game objects with CSS and jQuery in the previous sections. The next thing we need to create in the game is a way to get input from the players. We will discuss about the mouse input in this section.

Time for action – moving DOM objects by mouse input


We are going to create a traditional Ping Pong game. There is a paddle on both the left and right sides of the playground. A ball is placed in the middle of the playground. Players can control the right paddle and move it up and down by using the mouse. We will focus on the mouse input and leave the ball movement for a later section:

  1. Let's continue with our pingpong directory.

  2. Next, add a playground object inside the pingpong data object in the js/pingpong.js file. This stores variables that are related to playground:

    // data definition
    var pingpong = {
      paddleA: {
        x: 50,
        y: 100,
        width: 20,
        height: 70
      },
      paddleB: {
        x: 320,
        y: 100,
        width: 20,
        height: 70
      },
      playground: {
        offsetTop: $("#playground").offset().top,
      }
    };
  3. Then, create the following function that handles the mouse's enter, move, and leave events, and place it inside the js/pingpong.js file:

    function handleMouseInputs() {
      // run the game...

Time for action – Moving the ball with JavaScript Interval


We will use the function to create a timer. The timer moves the ball a little bit every 30 milliseconds. We are going to also change the direction of the ball movement once it hits the playground edge. Let's make the ball move now:

  1. We will use our last example, listening to multiple keyboard inputs, as the starting point.

  2. Open the js/pingpong.js file in the text editor.

  3. In the existing pingpong.playground object, we change to the following code that adds height and width to the playground.

    playground: {
      offsetTop: $("#playground").offset().top,
      height: parseInt($("#playground").height()),
      width: parseInt($("#playground").width()),
    },
  4. We are now moving the ball, and we need to store the ball's status globally. We will put the ball-related variable inside the pingpong object:

    var pingpong = {
      //existing data
      ball: {
        speed: 5,
        x: 150,
        y: 100,
        directionX: 1,
        directionY: 1
      }
    }
  5. We define a gameloop function and...

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Description

This book is for web designers who have a basic knowledge of HTML, CSS, and JavaScript and want to create Canvas or DOM-based games that run on browsers.

Who is this book for?

This book is for web designers who have a basic knowledge of HTML, CSS, and JavaScript and want to create Canvas or DOM-based games that run on browsers.

What you will learn

  • Build realtime network multiplayer games
  • Add physics to your canvas games by using the Box2D physics engine
  • Build a CSS3driven card game with transform and 3D flipping effects
  • Learn to add sounds to your games
  • Make a drawing tool in Canvas
  • Create multiple layers in a canvas game
  • Store game data persistently by using local storage
  • Use sprite sheets to create framebased animation

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 26, 2015
Length: 354 pages
Edition : 1st
Language : English
ISBN-13 : 9781785287886
Languages :

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Product Details

Publication date : Jun 26, 2015
Length: 354 pages
Edition : 1st
Language : English
ISBN-13 : 9781785287886
Languages :

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Table of Contents

12 Chapters
1. Introducing HTML5 Games Chevron down icon Chevron up icon
2. Getting Started with DOM-based Game Development Chevron down icon Chevron up icon
3. Building a Card-matching Game in CSS3 Chevron down icon Chevron up icon
4. Building the Untangle Game with Canvas and the Drawing API Chevron down icon Chevron up icon
5. Building a Canvas Game's Masterclass Chevron down icon Chevron up icon
6. Adding Sound Effects to Your Games Chevron down icon Chevron up icon
7. Saving the Game's Progress Chevron down icon Chevron up icon
8. Building a Multiplayer Draw-and-Guess Game with WebSockets Chevron down icon Chevron up icon
9. Building a Physics Car Game with Box2D and Canvas Chevron down icon Chevron up icon
10. Deploying HTML5 Games Chevron down icon Chevron up icon
A. Pop Quiz Answers Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8
(5 Ratings)
5 star 20%
4 star 60%
3 star 0%
2 star 20%
1 star 0%
Ebey Philip May 12, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Great book - at times a little heavy
Amazon Verified review Amazon
Alan Morato Aug 27, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
I can recommend this book especially to developers that want to start learning about Games in HTML5 (beginners).The book allow the reader to dive into games development concepts. You need basic understanding of Web Technology to read it (HTML5, CSS3, Javascript) but the author doesn't assume the reader is a expert in these technologies.The author starts by giving new features provided by HTML5, thus allowing the user to have a better understanding of what's possible with this language.
Amazon Verified review Amazon
Anthony F. Aug 21, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
A fun and quick but to the point read. The book is filled with examples (as the title suggests) showing you how the code is written step-by-step. You'll get an overview of the development of a mini-game (-ynot et- a full-fledged game), and some nice JavaScript tips you can use in other projects.The most interesting aspect of the book is that it covers the "new" APIs of HTML5 (canvas, WebSockets, local storage), enabling you to fully harness the power of modern web browsers.Aimed at beginners, but intermediate developers will surely take something away too.I substracted a star because there are some code mistakes and not everything was fully optimised to my taste.
Amazon Verified review Amazon
dreamster Sep 08, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
HTML5 Game Development by Example is a great book for anyone who is into building games. With HTML5 one can develop games that run on computers, smartphones, and tablets and this book helps ones to achieve that.The book covers six example games with clear tutorials which is explained across 10 chapters; each chapter explaining one topic. It covers almost all aspects of game building including drawing game objects, animating them, adding audio, and publishing our games. In my honest opinion this book will help one to jump start to the game development world.
Amazon Verified review Amazon
L.C.H. Apr 14, 2016
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
The author's methodology consist of giving you parts of the code first and then he tries to explain "What just happened", but to tell the true, the explanations were not so understandable for me. I didn't understand all that code that I was writing in most of the chapters. It is very frustrating to have thousands of lines of code and not having a clue what the heck is going on inside it.Also, there are parts of the book's code that are different from the downloadable (or bundled) code. For example, in the chapter 9, the dowloadable code is just one javascript file instead of the two that the author says you should create. An the worst thing is that the file seems very different from what the book is actually telling you to type.So to simplify things: This book is not for total beginners, you should have at least an intermediate level of Javascript, but even if you already have a little experience with it, you'll find some parts of the book's code that are not well written or complete.In fact, I'd like to mention that in the chapter 2, in the book's code, page 34, there is a faulty object property that makes your project (ping pong game) to fail. So if you are struggling in that chapter, make sure to check the downloadable code to avoid frustration. Believe me, it is very frustrating to re-read ALL the chapter again just to find out that you did everything as the book says, so the problem is not you, is the BOOK !!
Amazon Verified review Amazon
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