A brief introduction to HTML5 Game Development that describes and use ImpactJs, one of the most famous and complete frameworks for HTML5 Games, mostly for learning purposes. The benefits of HTML5 Games are described, along with the importance of using a Framework and describing in details the ImpactJs Game Engine (no code provided, since it's proprietary). Two different games are coded on the fly during the lesson, while providing tips and suggestions. The Reference, Bibliography and Resources section provide useful pointers for beginners.
Madrid JUG Conferences, Apr 2013.
Development of mobile applications has became complex, and Companies need teams with specialists in very different platforms. With GWT + Apache Cordova, you can develop reliable applications using a unique code base written in java.
Busy Developer's Guide to Windows 8 HTML/JavaScript AppsJAX London
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Top 13 best front end web development tools to consider in 2021Samaritan InfoTech
List & Comparison of Top Web Development Tools with Features & Pricing. Select The Best Front End Tool for Web Development Based on This Detailed Review, Web Development Tools helps the developers to work with a variety of technologies. Web Development Tools should be able to provide faster mobile development at lower costs.
Visit On:- https://www.samaritaninfotech.com
Madrid JUG Conferences, Apr 2013.
Development of mobile applications has became complex, and Companies need teams with specialists in very different platforms. With GWT + Apache Cordova, you can develop reliable applications using a unique code base written in java.
Busy Developer's Guide to Windows 8 HTML/JavaScript AppsJAX London
With the upcoming release of Windows 8, Microsoft decided to bring HTML+Javascript into the world of Windows-platform application development as a first-class citizen. But make no mistake, this isn’t an attempt to somehow subvert Web developers—it’s more about enabling Web developers to leverage those skills in building “native” Windows applications running on the Windows 8 laptops, desktops, and slates. In this presentation, we’ll go over the basics of building a Windows 8 app using HTML and JavaScript, including a brief overview of what’s possible—and what’s not—for the Web developer seeking to “go native” on Windows.
Top 13 best front end web development tools to consider in 2021Samaritan InfoTech
List & Comparison of Top Web Development Tools with Features & Pricing. Select The Best Front End Tool for Web Development Based on This Detailed Review, Web Development Tools helps the developers to work with a variety of technologies. Web Development Tools should be able to provide faster mobile development at lower costs.
Visit On:- https://www.samaritaninfotech.com
From Flash to Canvas - a penchant for black holesPatric Lanhed
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Introduction to Games with a Purpose design and PlaytestingLuca Galli
Presentation held at 6th Qualinet General Assembly to introduce the current status of research related to Games with a Purpose, with notes regarding the QoE in Gwaps
From Flash to Canvas - a penchant for black holesPatric Lanhed
This session will cover what HTML5 developers can benefit from knowing its way around in the world of Flash and ActionScript. The tools that could be used for a better Canvas experience and foremost how the display list will ease your burden.
Join the largest JavaScript Conference in Israel Things have changed. Today JS is the language of the web. On the client, on the server, on the mobile, everywhere. But let's face it: JS still has challenges.
Introduction to Games with a Purpose design and PlaytestingLuca Galli
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Matching Game Mechanics and Human Computation Tasks in Games with a PurposeLuca Galli
Presentation held at ACM Workshop on Serious Games at ACM Multimedia 2014 to introduce techniques that can be used to match Human Computation Tasks to Game Mechanics.
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In today’s gaming world, the word “Achievements”, even if rooted in the gaming history, has become extremely popular. The spread of broadband connections and the introduction of multiplayer interactions as core components of a videogame have brought to life to a number of social platforms like Xbox Live!, Playstation Network, Steam and Kongregate, in which the players can track their progress along different game titles and compete among each others. Unfortunately, even if such platforms share similar features, the way in which they manage the aspects of user profiling and statistic tracking is different, leaving the architectural and development aspects of an achievement system tied to the implementation of each vendor. This paper provides an insight on Achievements, their purposes and the way in which they have evolved. A taxonomy of possible achievements is shown along with a set of guidelines to be followed when developing them. Finally a model that can be used to describe all the existing systems is introduced in order to try to put the basis for an open platform capable of integrating existing gaming communities.
Multi-platform Compatibility of HTML5 by developing simple HTML5 based game(M...Himanshu Sharan
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It is a our group project.It is game made from HTML,CSS,Java Script in a web browser.
Here is the video link:-https://www.youtube.com/watch?v=_OHRerLS4dI
20180518 QNAP Seminar - Introduction to React NativeEric Deng
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OSCON 2012: Design and Debug HTML5 Apps for Devices with RIB and Web SimulatorGail Frederick
Learn how to build UI for and debug HTML5 apps for mobile devices using Rapid Interface Builder (RIB) and Web Simulator, two open-source tools recently released by Intel. This session dives deep into the feature sets of both Web app developer tools, with demos, and shows you how you can influence the future of these open-source projects.
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HTML5DevConf 2013 (October): WebGL is a game changer!Iker Jamardo
WebGL is getting everywhere. The recent announcement from Microsoft that Internet Explorer is finally supporting WebGL is just another example of the importance that this technology is getting among web technologies. For the first time, web developers can access complex graphics features that were only available for native game development. But, what are the real advantages of WebGL over other web based games development technologies? What are the different game engines that support it? Is WebGL ready for cross-platform game development? Can only 3D games benefit from WebGL? All these questions and more will be answered in this talk full of code snippets and useful tips that will try to show that the web environment (and specially WebGL) can be great for developing successful games, and could become in a real game changer.
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3. Mobile Applications Development –HTML5 Games
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Why choosing HTML5 for Web Games?
●No need to install external plugins (e.g. Unity)
●Crossplatform Development & Deployment with no additional costs (Licencing for Unity, UDK and similars is a nightmare)
●Optional Installation: the distribution of HTML5 games depends solely upon the developer; live updates are possible if online distributed, cross deployment as hybrid applications
●...but still a futuristic technology, even if we are getting there
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What if I want to start from scratch?
●Starting from scratch is certainly possible but not a good idea if you want to start developing a game quickly:
●Games require a lot of images, sound effects, libraries and other resources that are loaded asynchronously; the Javascript code will start executing before all the resources have been loaded. This results in popping images and sound effect not played when they should. Solution: create a preloaderthat defers script execution until all the resources have been downloaded
●Different machines and browsers will run the game at different speeds. Animations and movement speeds should be independent of the frame rate the game is running at
●You have to handle different resolutions targeting different devices (e.g. Desktop, Mobile...)
●Lesson: There is a lot of boilerplate code that every game needs to work properly. No need to reinvent the wheel: Use a Framework!
●Further details on: http://msdn.microsoft.com/en-us/hh563503
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What is ImpactJs?
●JavaScript game framework.
●Impact takes advantage of the modern browser’s Canvas element in order to create high-performance 2D games on the Web and even mobile.
●Easy to pick up good code examples, active community, robust level editor
●Why choosing it if it’s commercial?
●Once you buy the license, the engine source code it’s yours to be modified at will.
●You can dive into the code and actually read it, without jumping back and forth between dozens of layers of abstractions. Other game engines are more convoluted and don't make it as clear what a particular piece of code is doing.
●Accessible and consistent API that does not make use of cumbersome and obscure abstractions.
●Performance monitoring tools integrated within the engine
●For these reasons, Impactis a good fit if you want to LEARN about game engines or even Javascript programming in general.
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Let’s start...
●Must have:
●PHP
–The level editor has a php dependence for saving levels and baking the game, and it’s a core tool.
●Apache
–Necessary for hosting the game locally and testing it out while developing
●IDEs
–Impact has no IDE dependencies; you can create your games with any simple text editor.
–Hint: As Politecnico’s Students you have free access to the Jetbrains suite, use it!
●Browsers
–Any modern browser with canvas and audio tag support will do but Webkit based ones such as Chrome will offer better performances.
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Let’s start...
●Handy Tools:
●IntelXdk: Development Framework for HTML5 Applications with devices emulation
●Shoebox: to handle spritesheets generation
●Spartan: Pixel Art animation software and procedurally generated textures
●Spriter: an editor for cutout animations
●Cxfr: Tool for dummies to create sound effects
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Apache/Php/MySql
●There are a number of possible choices to have such a stack, I prefer a quick and easy environment just to start as soon as possible:
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Download and deploy the engine
●Extract the zip file containing the engine and the editor, take the «Impact» folder, rename it as you wish (the name of your game could be a good idea) and place it in the root location of your server, for XAMPP:
"your installation location"xampphtdocs
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Directory Structure
●media/Contains Images, Sounds, Musics
●lib/Hosts the Javascript Files
●lib/game/Hosts the code of the game
●lib/game/entities/Hosts the code for the entities
●lib/game/levels/Hosts the levels of the game
●lib/impact/Hosts the Game Engine Libraries
●lib/weltmeister/Hosts the Level Editor Libraries
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Impact Modules
1 ig.module(
2 'game.main'
3 )
4 .requires(
5 'impact.game',
6 'impact.image',
7 'game.other-file'
8 )
9 .defines(function(){
10 // code for this module
11 });
Natively, javascript has not a way to load other javascript files within an object, for this reason impact has implemented its own include system, similar in a way to other Javascript libraries to load modules and dependeces (e.g. Require.js). Modules and their dependencies typically reside in the lib/ folder of your Impact project directory, and subdirectories are included in a path to these files using object-model dot syntax.
Defines the module name that corresponds to the file name. Therefore, the main.js file sits in the lib/game/main.js
Any additional files that have to be loaded at runtime, before the module’s body and define function. Are essentially the libraries that we need to use when creating a game
The last step the module takes is to execute the function passed to the .defines() method.
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Classes in Impact
●Javascript does not have a real notion of a traditional class structure like the one you could have in other OOP languages, since it is a prototypal language; everything is an Object.
●This is the blessing and curse of Javascript, making it incredibly flexible but also extremely difficult to structure the code in a reusable way.
●Impact classes are derived from John Resig’s Javascript Inheritance code, extended with deep copying of properties and static instantations
●For further information regarding OOP in Javascript, refer to:
●https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
●https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object- Oriented_JavaScript
●http://www.crockford.com/javascript/private.html
●http://phrogz.net/js/classes/OOPinJS.html
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Classes in Impact
// Create a new class "Person"
varPerson = ig.Class.extend({
name: '',
init: function( name ) {
this.name = name;
}
});
// Instantiate an object of the first class
vare = new Person('John Doe');
e.name; // => John Doe
// Extend the "Person" class
varZombie = Person.extend({
init: function( name ) {
this.parent( 'Zombie: ' + name );
}
});
// Instantiate a Zombievarp = new Zombie('John Doe');
p.name; // => Zombie: John Doe
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The Game Loop
●Agame loopruns continuously during gameplay. Each turn of the loop, it processes user inputwithout blocking,updates the game state, andrenders the game. It tracks the passage of time tocontrol the rate of gameplay.
●Actually more considerations could be done (like fixed or variable time steps) , but we will not dig through all the details…
http://gameprogrammingpatterns.com/game-loop.html
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Impact.js -> ig namespace
●the igobject provides the Module definition and loading capabilities as well as some utility functions.
●igis not an instance of a ig.Class, but just a simple JavaScript object and thus can't be subclassed.
●Impact extends some of JavaScriptsnative objects, such as Number, Array and Function.
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Animation
●An ig.Animationobject takes care of animating an Entity or Background Map tile. Frames from an animation sheet –an image with all animation frames –are drawn as specified by the animations frameTimeand sequence.
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Background Map
●An ig.BackgroundMapdraws tiles from a Tileset, as indicated by its 2D data Array.
●The size of the tilesetimage must a multiple of the tilesize, otherwise Impact will get confused with the tile numbering. E.g. with a tilesizeof 32 the width and height of your tilesetimage should be one of: 32, 64, 96, 128…
•You can either create a BackgroundMapby hand, or use the ig.Gameclass' .loadLevel() method, which takes the save data from the level editor and creates BackgroundMapsaccording to it.
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Collision Map
●An ig.Collisiontakes a 2D tilemapand allows tracing against it for collisions.
●The ig.Gameclass' .loadLevel() method takes the save data from Weltmeisterand creates a CollisonMapif present.
●By default, all entities trace against the ig.game.collisionMapas part of their update cycle.
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Entity
●Interactive objects in the game world are typically subclassedfrom this base entity class. It provides animation, drawing and basic physics. Subclassingyour entities from ig.Entityensures that it can be added to the game world, react to the collision map and other entities and that it can be used in the editor.
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Game
●ig.Gameis the main hub for your game. It hosts all currently active entities, background maps and a collision map. You can subclass your own Game Class from ig.Game.
●Its .update() and .draw() methods take care of collision detection, checking entities against each other and drawing everything to the screen.
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Input
●ig.Inputhandles all Keyboard and Mouse input.
●You can bind keys to specific actions and then ask if one of these actions is currently held down (.state()) or was just pressed down after the last frame (.pressed()).
●Note that an instance of ig.Inputis automatically created at ig.input(lowercase) by the ig.main() function.
// On game start
ig.input.bind( ig.KEY.UP_ARROW, 'jump' );
// In your game's or entity's update() method
if( ig.input.pressed('jump') ) {
this.vel.y = -100;
}
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System
●ig.Systemtakes care of starting and stopping the run loop and calls the .run() method on the current Game object. It also does the housekeeping for ig.Inputand provides some utility methods.
●An instance of ig.Systemis automatically created at ig.system(lowercase) by the ig.main() function.
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And more...
Several other classes are present in the Engine:
●Loader: takes care of preloading the resources and showing a loading bar
●Music, Sound, Soundmanagerto handle sounds within the game
●Timerto handle timers and time intervals
●Fontto draw text based on bitmap fonts into the canvas
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•The Sequence Diagram describes the necessary interactions between the basic classes to start a game loop
•Classes for handling sounds have been omitted for simplicity
ImpactJs Game Engine Flow: Sequence Diagram
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Impact Game Engine Flow Summarized –Pt.1
●As soon as you start your game, Impact will set up an interval that calls the ig.system.run() method 60 times per second. This method does some housekeeping stuff and then calls your game's .run() method -which, by default, just calls .update() and .draw() on itself.
●The ig.Game's.draw() method is pretty boring: it just clears the screen and calls .draw() on each background layer and entity.
●The .update() method updates the background layer positions and -this is where it gets interesting -calls .update() on each entity. The default .update() method of an entity moves it according to it's physics properties (position, velocity, bounciness...) and takes the game's collision map into account.
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Impact Game Engine Flow Summarized –Pt.2
●After all entities have been updated, the game's .checkEntities() method is called. This resolves all dynamic collisions -that is, Entity vs. Entity collisions. It also calls an entities .check() method, if it overlaps with another entity and "wants" checks (see the Class Reference for more details).
●You can overwrite any of these methods in your own ig.Entityand ig.Gamesub-classes -you can provide your own logic and then, if you want, call the original methods with this.parent().
●Remember, this all is happening for each and every frame. That is (if the browser can keep up) 60 times per second.
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•Endless Swarm Game
•Kill the enemies by typing their name
•Exclusive Demofrom the Developer
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Impact++
●Free Boilerplate for ImpactJs
●Dynamic Lights, AI, Pathfindingand optimizations for ImpactJs
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References, Bibliography, Useful Resources
http://impactjs.com/documentation
http://html5devstarter.enclavegames.com/
http://www.html5gamedevelopment.com/
http://gamemechanicexplorer.com/
https://hacks.mozilla.org/2013/09/getting-started-
with-html5-game-development/
http://www.pixelprospector.com/
http://html5gameengine.com/
http://www.jsbreakouts.org/
Free HTML5 Game Development Course from
Google’s Gurus:
https://www.udacity.com/course/cs255
Note: For the students of the course,
agreement for 10 ImpactJs licenses for
300$, 30$ per Licence! Email me for details