"JavaScript (sometimes abbreviated JS) is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. It is a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles." From Wikipedia. http://en.wikipedia.org/wiki/...

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3
votes
2answers
280 views

How do I maintain an online users list?

In a multiplayer JavaScript game client, is it a good idea to poll the server periodically to refresh online user list, or keep track of joined/left users? Is there a better option?
2
votes
1answer
944 views

2d grappling hook for platformer?

What are the options and mechanics for creating a grappling hook in a 2D game? In the prototype for this feature, the person runs around in a platformer world and can throw the hook at any wall, ...
3
votes
1answer
1k views

How can I detect mouse events on sprites in a canvas?

I'm making an HTML 5 game. I want mouse clicks on sprites drawn in a canvas element cause events that my code can react to. At the moment, I'm doing it by checking through all of my sprites in a for-...
2
votes
1answer
349 views

How can I repeat only a portion of an image in Javascript?

So I'm trying to repeat a portion of my spritesheet as a background. So far, I have attempted this: var canvas = $("#board")[0], ctx = canvas.getContext("2d"), sprite = new Image(); ...
7
votes
1answer
1k views

Jump handling and gravity

I'm new to game development and am looking for some help on improving my jump handling for a simple side scrolling game I've made. I would like to make the jump last longer if the key is held down ...
1
vote
1answer
678 views

Implementing fog of war on HTML5 canvas

I have been wrestling with creating fog of war for a while now. I actually did create it, but I consider the implementation too resource-heavy to be usefull. For initial information: I use createjs / ...
1
vote
1answer
1k views

How to draw many identical quads in WebGL efficiently?

I have recently been trying to develop a more basic one of those 'falling sand'/'powder game' style games (See here) the past few months, and after prototyping on a plain canvas, then trying PIXI.js, ...
10
votes
9answers
19k views

What are some good jquery/javascript game engines? [closed]

So I have decided to try a bit of javascript/html5 game development (worked with XNA/Unity so far). Wondering if anyone had any suggestions. I am currently looking at impact, gameQuery and Jaws. (...
3
votes
4answers
4k views

Play audio in javascript with a good performance

I'm developing a browser game where the player can shoot. Everytime he shoots it play a sound. Currently i'm using this code to play sounds in JavaScript: var audio = document.createElement("...
1
vote
1answer
170 views

How do I keep user input and rendering independent of the implementation environment?

I'm writing a Tetris clone in JavaScript. I have a fair amount of experience in programming in general, but am rather new to game development. I want to separate the core game code from the code that ...
0
votes
2answers
217 views

How can I get a property of an entity without having to call getEntityByType every time?

I'm trying to get an entity (a bullet, a grenade, and an explosive) from my player. Specifically, I want the shootingRate of my bullet (how frequently it can be fired). How can I do this without ...
1
vote
0answers
310 views

Open Source HTML/JS game(s) with license that would allow embedding in my app? [closed]

I'm working on an educational app for kids. At the end of the sign-up process, the kids must wait for a confirmation from their parents in order to gain access to the app. While they wait for this to ...
0
votes
1answer
404 views

Movement / aiming algorithm in 2d / tiled based game

I'm trying to create simple 2D / tiled base game in JavaScript. Entities are able to move by any number of pixels, but only in one direction at once (can't go in diagonal way). AI for enemies is ...
2
votes
1answer
7k views

Translate object in world space usings it's local rotation

I'm using Three.JS to render some objects. I'm struggling with some very simple object rendering and translation. The scenario is that I spawn an object at 0,0,0 in world space with 0,0,0 rotation. ...
1
vote
1answer
1k views

JavaScript - 2D Top-down Collision Detection issue

I'm developing a 2D Top-down Game using HTML5 Canvas and a custom Game Engine. I'm implementing the Quad-intersection detection (Function below, if it helps) on different areas of the Sprites (As they'...
0
votes
1answer
106 views

How to change the start position of my 2D game

I am trying to create a game where you have to move a ball on a platform. At the start of the game, the ball is dropped on the platform and then you can move it around. This is al working, no problems ...
1
vote
2answers
1k views

Shop and Inventory System

I'm creating a JavaScript game, and I'm getting stuck. When the player obtains X amount of gold, a middle column appears (you've unlocked the shop, yay!), and when you obtain more gold than an item ...
1
vote
1answer
461 views

Storing a Quadtree

I have a quadtree which organize my terrain chunks (heightmap) and all the static objects of my 3D world. I use Axially Aligned Bounding Box as a volume for each node of the quadtree. Due to the ...
1
vote
1answer
449 views

Replace a div (with a ball picture in it) with a 3D canvas ball [closed]

I am trying to make a game where you have to keep the ball on a green platform. At this point the ball is a div with a ball image. You can move the ball over the field, all works great. See it in ...
7
votes
3answers
4k views

Tips for communication between JS browser game and node.js server? [closed]

I am tinkering around with some simple Canvas based cave flyer game and I would like to make it multiplayer eventually. The plan is to use Node.js on the server side. The data sent over would ...
0
votes
0answers
37 views

Sprite rotation algorithm [duplicate]

I'm making a game where you have to plot a function to hit certain objectives. I already made the plotting function and the animation to display a tiny missile that travels above the function. My ...
3
votes
2answers
2k views

Essential 2D engine features [closed]

I have decided to make a simple engine for a new game I'm working on, and now, I'm wondering: what are the essential features of a 2D game engine? Or, a game engine in general?
0
votes
2answers
442 views

How to properly handle attacks in an 2D Platformer?

I am building an 2D Engine in JavaScript and if my actor attacks an enemy, a hitbox appears for a certain amount of time and then disappears. If the target keeps standing inside of the hitbox he gets ...
1
vote
1answer
966 views

How to continuously create objects in front of the camera when moving forward?

I have created a scene in Unity3D that's filled with spheres. I want to be able to move forward forever and still be passing through the spheres. I was thinking I'd keep the player in one spot and ...
6
votes
3answers
1k views

multi touch on HTML5 with JavaScript?

How action game controls should be implemented so that they would work on smart phones as well? At the moment I use wasd/arrow keys and I am able to handle for example two keys down at the same time. ...
0
votes
2answers
647 views

Increasing speed of circle over time as linear with Box2d

Assume that there is a circle and it can be moved by using keyboard arrows.Is required that increasing speed over time like increasing car speed. For example; max speed is 25 and time to reach max ...
26
votes
5answers
7k views

Implementing features in an Entity System

After asking two questions on Entity Systems (1, 2), and reading some articles on them, I think that I understand them much better than before. But, I still have some uncertainties, and mainly they ...
0
votes
2answers
216 views

Unity3D JavaScript/.NET code throwing compilation error with a List-thingy [closed]

So, I do this: var intlist:List.<System.Int32>; intlist.Add(1); And where I say intlist.Add(1) I get: NullReferenceException: Object reference not set to an instance of an object Weird, ...
0
votes
1answer
170 views

Play .mp3 with Craftyjs

I want to play .mp3 sound files in a game I built with Crafty.js. Is this possible without converting the sound file?
3
votes
1answer
1k views

Converting cartesian geo-coordinates to isometric (real world map to game map)

I need to create an automated method to convert real cartesian, geo-coordinate data (such as roads and parks), into isometric coordinates as a game map view for use in HTML5 Canvas. Here is an image ...
0
votes
1answer
113 views

Console vulnerabilities in javascript-based game [closed]

Been toying around with a basic browser-based game for a while now, and getting deep into the vulnerabilities of client-side script. I know enough to understand that no client-side script is ever safe....
1
vote
2answers
589 views

Bouncing off a circular Boundary with multiple balls?

I am making a game like this : Yellow Smiley has to escape from red smileys, when yellow smiley hits the boundary game is over, when red smileys hit the boundary they should bounce back with the ...
0
votes
1answer
247 views

Isometric Movement in Javascript In the DOM

I am creating a game using Javascript. I am not using the HTML5 Canvas Element. The game requires both side view controlles, and Isometric controls, hence the movementMode variable. I have got the ...
0
votes
1answer
136 views

How can I ensure reasonably spaced out enemies

I have a simple javascript game and I'm initializing their positions on the y axis using random numbers. How can I ensure that they are reasonably spaced apart? My simple algorithm is: y = (Math....
2
votes
2answers
191 views

Testing HTML5 canvas games on low resource computers

I've made a game in HTML5 & JS and want to test it on varying types of user setups as I've heard it doesn't perform too well on older MacBooks. How can I accomplish this? I'm thinking of ...
1
vote
2answers
481 views

Best way to do “cutscenes” [closed]

I'm curious about the best way to display cutscenes in canvas. When I say cutscene I mean something like a static image fading from one to the other. Would it be best to use a timeout for a certain ...
3
votes
2answers
1k views

HTML5/JS - Choppy Game Loop

I have been experimenting with HTML5/JS, trying to create a simple game when I hit a wall. My choice of game loop is too choppy to be actually of any use in a game. I'm trying for a fixed time step ...
0
votes
1answer
149 views

Variable number of GUI Buttons

I have a generic HTML5 Canvas GUI Button class and a Scene class. The Scene class has a method called createButton(), which will create a new Button with onclick parameter and store it in a list of ...
5
votes
5answers
4k views

What would be a good way to implement/render a 2D tiled map for a browser game?

I coded a a little RPG in ruby and I used an array to contain the map squares. The elements of the array (which defines the X coordinates) are arrays themselves whose elements defines the Y coordinate,...
0
votes
0answers
413 views

JavaScript 3D space ship rotation

I am working with a fairly low-level JavaScript 3D API (not Three.js) which uses euler angles for rotation. In most cases, euler angles work quite well for doing things like aligning buildings, ...
0
votes
1answer
140 views

Why does my goblin only choose a walk direction once? [closed]

I'm working on a simpe 2d canvas game that has a small goblin sprite who I want to get pathing around the screen. What I originally tried was a random roll that would choose a direction, the goblin ...
0
votes
1answer
180 views

Isometric displaying two different images in different positions

I'm creating a simple Isometric game using HTML5 and Javascript, but I can't seem to get the display to work, at the moment i have 9 tiles that have X and Y positions and the player has a X and Y ...
8
votes
1answer
718 views

How Do Shapes (Rectangles) Work in Quad Trees?

I've been told that a quad tree is the ideal data structure for my game, but I'm having trouble understanding how exactly shapes work within quad trees. I'm doing this in JavaScript, but I think ...
4
votes
3answers
4k views

List of 3D libraries based on WebGL [closed]

Is there a up-to-date list of WebGL libraries or articals with comparison? Until now I heard only three.js and GLGE.
0
votes
1answer
768 views

Am I doing this node.js game loop wrong?

I have 2 arrays of JSON objects, actions and game objects. At any time a user can make a request from the client which can add an action to the actions array. I have a setInterval(function(){ }, ...
0
votes
2answers
716 views

HTML5 Canvas Parsing image into tileset while preserving transparency

I'm trying to import a Tiled Map Editor JSON file into my HTML5 canvas game but I'm having trouble with separating out the tileset image into separate images while preserving the transparency. ...
1
vote
1answer
177 views

How can I structure my ASCII terrain object?

So I have this object which represents a simple ASCII "overworld". Note the code is broken, but it's for demonstration purposes... var TerrainObj = { w: { name: 'water', glyph: 'w' }, g: { ...
1
vote
1answer
443 views

WebGL immediate mode

I know that WebGL is based on OpenGL ES 2.0 and that glBegin and glEnd have been removed and replaced with vertex buffer objects. I understand that VBOs are faster and use less code but is there a ...
0
votes
4answers
584 views

HTML5 Jump and Run Game Performance issues

we're developing a HTML5/Javascript jump and run game and therefore we have developed our own gameframework. It consists of following most important structures: Stage/Scene/Layer: divs ObjectEntites/...
3
votes
1answer
553 views

Javascript tile map -> bitmap or JSON

I would like to know which idea is better in terms of performance. The map is 5000x5000 tiles and I plan to expand it even more. It is split into 50x50 regions and camera doesn't move with player, ...