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+ - Book Review: Core HTML5 2D Game Programming->

Submitted by eldavojohn
eldavojohn (898314) writes "Core HTML5 2D Game Programming details a journey through creating Snail Bait in well defined steps. This simple two dimensional platform game works as a great starting point for anyone interested in making their very first game targeting many desktop and mobile platforms. This incremental process is expertly segmented into logical lessons with the only prerequisite being fluency in JavaScript. One of the most attractive aspects of this book is that the core concepts of this book don’t rely on some flavor of the week JavaScript library or framework.

author David Geary
pages 615 pages
publisher Prentice Hall
rating 9/10
reviewer eldavojohn
ISBN 9780133564242
summary An exercise in 2D game development and mechanics in HTML5 and JavaScript.

First, this book isn't for people who do not recognize HTML5 and JavaScript as a valid development platform for games. I know you’re out there, you can stop reading here and move on to the next article. This book isn't for you. If you have no programming experience this book is likely not for you either. This book dives into concepts faster than Geary’s last book on game development in Canvas. You should also be familiar with JavaScript if you want to effortlessly start on this book. Throughout the book, Geary utilizes object’s JavaScript prototypes to add functions, uses anonymous functions and refers to common programming patterns.

It is worth repeating that the implementation in this book does not rely on a framework or library that could change or go defunct. The game runs entirely on code covered in the book accessing W3C standard specifications like requestAnimationFrame(). As long as JavaScript interpreters don’t change core things like timing control, this book should be relevant to developers for years to come.

The reason this book gets a nine is it accomplishes everything it sets out to do and Geary does a great job dividing up task after incremental task of setting sprite sheets and backgrounds into motion. The reason it doesn't get a ten is that I was personally disappointed with the the author devoting little time to physics and their simulations.

The book is laid out to enable its use as two kinds of resources: cover to cover and chapter specific topics. Reading this straight through, there were only a few times where it felt like I was needlessly being reminded of where I had already read about tangential topics. On the plus side if you ever want to see how Snail Bait implemented something like sound, you need only spend time on the chapter devoted to sound sprites. One mild annoyance I had with the text was that the author seems to always refer to Snail Bait as “Snail Bait” which leads to a Ralph Wiggum-like aversion to pronouns or saying “the game” instead occasionally. It might only be me but it can become tiresome to read “Snail Bait” five or six times on the same page.

You can read a sample chapter here that shows how to implement sprite behaviors.

The first two chapters of the book focus on a set of basic guidelines to follow when doing game development in HTML5 and JavaScript — like keeping certain UI display elements in CSS instead of rendering them as paths or objects in the Canvas. Geary also covers the very absolute simplest concepts of how graphics are going to be displayed and how the background is going to move. He also spends time in Chapter Two showing how to best set up the development environment. It is demonstrated how shortening your cycle of deployment saves you tons of time and the author does a great job on letting you know what tools to use to debug throughout the whole text.

The third chapter delves into draw and rendering graphics in the canvas as well as introducing the reader to the game loop. It spends a good amount of time explaining the use of animation frame control in a browser to keep animations running smoothly. It also begins the auditing of frame rates so that the game can respond to and display things normalized at the rate the user is experiencing them. It also touches on how parallax can be employed to show things closer up moving faster than those further back in the background. This illusion of depth has long been popular and is even finding its way into scrolling on blogs and I wish that Geary would have spent more time on this perhaps in a later chapter but offer the reader more on how to do multiple levels of depth.

The next chapter tackles the core infrastructure of Snail Bait and discusses at length encapsulation of certain functionalities (instead of globals) in the source code as well as Snail Bait’s 2300 line prototype. It bothers me that one file is 2300 lines and I wish there was a better way to do this but as a learning tool, it works even if it is daunting to scroll through. The book adds some helpful pointers about how utterly confusing the “this” keyword can be in JavaScript. Chapter Four really sets the pace for the rest of the book by introducing the use of event listeners and illustrating how the game loop is going to continually be extrapolated.

The next three chapters cover the use of loading screens, sprites and their behaviors. Snail Bait uses all its graphics from an open source game (Replica Island). But if you were to design your own graphics for your game, these chapters do a great job of showing how to construct sprite sheets and how to use tools to construct metadata in the code so that the sprites are usable by the sprite artists. Using the flyweight pattern, Geary sets the stage for more complex behaviors and actions to come in the following chapters.

The next three chapters cover time, stopwatches and their effects on motions and behaviors within the game. The author starts and works from linear motion to non-linear motion and then using transducer functions to affect the time system. The game now has bouncing coins, a jumping player and Geary does a good job of showing the reader how to emulate behaviors in the code.

Naturally what follows next is collision detection and gravity. The collision detection strategies were adequate but I wish that there was more depth at least referenced in the text. This isn't a simple problem and I did like how Geary referenced back to chapter two’s profile and showed how collision detection performance as you implement and refine and optimize your algorithm. The nice thing about this book is that it often tackles problems with a general solution in the code (runner/sprite collision) and then provides the edge case solutions.

In the fourteenth chapter, the author tackles something that has long been a plague in HTML5 games: sound and music. The author doesn't sugarcoat this citing the long history of problems the vendors have had trying to support this in browsers. There’s a great explanation of how to create and handle “sound sprites” (similar to sprite sheets) so that there is only one download for background music and one download for audio sprites.

Next Geary covers the problem of multiple viewport sizes with a focus on mobile devices. Of course this is one of the biggest issues with mobile gaming today. The chapter is lengthy and deals with the many intricacies of scaling, sizing and touch events. This chapter is long but the highly detailed support of multiple platforms and resolutions is a justified discussion point.

In sixteen, the reader gets a treatment of utilizing sprites and their artists to simulate sparks and smoking holes. The book calls this chapter “particle systems” but I don’t think that’s a very good title as the code isn't actually dealing with things at the particle level. Instead this chapter focuses on using sprites to simulate those behaviors via animation. This is completely necessary on a computation inexpensive platform but it is misleading to call these particle systems.

Now that the game looks and functions appropriately, the book covers UI elements like player scores and player lives. The auditing of these metrics are covered in the code as well as warnings when the game begins to run to slowly. It also covers the ‘edge’ condition of winning in the game and the routine that is followed when the user wins the game.

The next chapter introduces the concept of a developer backdoor so that the reader can manually speed up or slow down the game while playing it or even test special cases of the runner sprite interacting with other elements. It’s a useful trick for debugging and playing around but does devote a lot of time to the specialized UI like the speed slider and other things that won’t (or rather shouldn't) be seen by a common player.

Chapter nineteen really felt out of place and very inadequate on important details. It’s a blind rush through using node.js and socket.io to implement server side high scores. The way it’s implemented would make it trivial for someone to submit a high score of MAX_INT or whatever to the server. The metrics reporting is done in a manner that (in my opinion) breaks from long established logging structure one would be familiar with. While it covers important things to record from your users in order to tweak your game, the inadequacy of discussions about shortcomings makes it feel out of place in this text. It's a topic of great depth and I have no problem with an author touching on something briefly in one chapter — this chapter does lack the warnings and caveats found in other chapters though.

Contrary to the previous chapter, the final chapter is a fast application of the entire book’s principles applied to a new game (Bodega’s Revenge). Geary gives a final run through showing how the lengthy prior discussions quickly translate to a new set of sprite sheets and game rules. If this book is ever expanded, I think it would be great to include additional chapters like this although I would pick a more distinct and popular two dimensional game format like a tower defense game or a bejeweled knockoff.

Overall, Core HTML5 2D Game Programming is a great book for a JavaScript developer looking to dabble in game development. You can purchase Core HTML5 2D Game Programming from barnesandnoble.com. Slashdot welcomes readers' book reviews (sci-fi included) — to see your own review here, read the book review guidelines, then visit the submission page. If you'd like to see what books we have available from our review library please let us know."

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Comment: Re:So what's the real story here? (Score 1) 72

Just like they tell you that you any time you think you might be being pulled over by someone who's not a real cop (say, an unmarked car), you can drive to the parking lot of a police station before pulling over.

Disclaimer: That only works if you are white.

Comment: Re:No (Score 1) 54

by damn_registrars (#48949957) Attached to: Props to William Jacobson

Why you can't understand that "the security of a free State" is about the absolute right of self defense,

I can't understand it because there is no connection there. You and many others pretend that there is, but that won't make it so.

and instead want to call it "a product manufactured by the gun lobby"

Because the gun lobby is the primary profiteer of this paranoia. There is no mention of self defense in the Second Amendment, period. You can twist it all you want and harp BS about the intent of people who died over a hundred years before you were born, but the fact of the matter is that there is no mention of self defense in the text that they wrote.

common sense

Common sense tells us that the overwhelming majority of all people in this country never, ever, have a need for a gun for self defense. Common sense tells us that more people are killed accidentally by guns every year than are protected by them. Common sense tells us that the Second Amendment does not mention self defense.

Comment: Re: Problems with the staff (Score 3, Funny) 121

by PopeRatzo (#48949953) Attached to: The Pirate Bay Is Back Online, Properly

there is a Flash exploit that STILL isn't patched, that only requires a user to visit a site with a bit of compromised embedded flash content like a banner ad, and BOOM, owned. You don't even have to click a link, just visit a domain hosting the content on a page.

I notice your account was created yesterday. Please let me be the first to welcome to you Slashdot.

Maybe you could tell us a little bit about yourself, by way of introduction. Like maybe your badge number.

Comment: Re:Word on the street is that SW rocked (Score 1) 25

by damn_registrars (#48949937) Attached to: The Kevlar Kandidate Starts Kampaigning

I submit that you may be kind of oblivious to organizational behavior.

No, it would appear that you are the one who wears blinders to the situation. We have 40 hour work weeks because of organized labor. We have worker's compensation for injuries on the job because of organized labor. We have a minimum wage and rights to file grievances because of organized labor. We have occupational safety standards because of organized labor.

You focus only on the things that your political heroes blame on organized labor, regardless of whether or not those things are rooted in reality.

What I *would* do, granted ridiculous powers of fiat, is limit public employment (non-teacher & military, I mean bureaucrats) to 10 years.

So you wouldn't want someone working for the DMV for 10 years? What about police and fire? And what about disabled people who can't find work in the private sector but can hold reasonable jobs in their local government?

I don't really see what any of this has to do with unionization, though.

Simpler systems and higher turnover rate are worth a try for minimizing corruption.

A higher turnover in congress I would generally endorse. The problem though is that the overwhelming opinion of the American voter follows the line of "congress is bad, buy my guy is GREAT". So good luck getting traction on and kind of term limit for them.

Comment: Re:not my takeaway at all (Score 1) 54

by Bill Dog (#48949231) Attached to: Props to William Jacobson

Just noticed a couple of headlines here:

"Most Americans Support Government Action On Climate Change"

and

"The NSA Is Viewed Favorably By Most Young People"

Yes, America is quite lost for at least the next two or three generations. Like I've said before, after that there's a slight chance of a generation actually stopping to think about what a shithole America had become.

So the Left's goal is to take us as far Left as they can and they hope past the point of no return, before any generation wakes up. We could argue if we're already past that point (if you engaged in presenting arguments, that is), but if we're not yet, I don't see how, all in all, their plan can possibly fail. (And apparently neither do you.)

Comment: Re:not my takeaway at all (Score 1) 54

by Bill Dog (#48949149) Attached to: Props to William Jacobson

Et tu, smitty? I knew the likes of DR and fusta would always be just wasting my time, but I wasn't expecting that from a religious Rightie. (Yes, even one who displays a real soft spot for the wicked.)

Oh well, it's not like I didn't already assume that you've got nothing when it comes to actually backing up your optimistic stance. I certainly can't come up with anything, at least not conceivably in our lifetimes.

Comment: Re:Good data first, then maybe big data later (Score 2) 93

by NeutronCowboy (#48945853) Attached to: Cutting Through Data Science Hype

Absolutely true. Unfortunately, it's far easier to convince management that the problem is the lack of a shiny tool that shows them pretty graphs than shitty data that they have to pay some consultant an ungodly amount of money to fix. Because, of course, no one in the company has the time to fix the data on which they run their business.

To the systems programmer, users and applications serve only to provide a test load.

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