"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. ...

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3
votes
0answers
1k views

Poor performance in android when running APK, runs fine in browser

I have created a small game project in HTML5 using Phaser engine (tried both 1.1.5 and 1.1.6). Then to port it to mobile platform, used Phonegap/Cordova for Windows Phone 8, Android and iOS. In my ...
1
vote
3answers
99 views

Box2dWeb: setting velocity of bodies using events

I would like to move a kinematic box by pressing the down arrow. As is noted by the console logs, the keydown actually does change the box's velocity... but for reasons beyond my grasp it still ...
0
votes
1answer
66 views

board game card spacial events handling [closed]

im implementing a not so simple board game, i have a way to do most stuff (start game handling,turn handling,combat system,movment etc). im having a problem with spacial cards that players draw,the ...
-1
votes
2answers
180 views

How do I make a 2D platformer AI aware of its allies?

I'm trying to develop a 2D platformer AI that is aware of its buddies and tries to not overlap with them. However, I always end up with an "snake": I dont want them to be so robotic, but instead ...
3
votes
2answers
231 views

HTML5 game fps render lag

I am currently creating a flappyBird-like HTML5 game using Proccessing.js You can see current work here: http://files.tips4design.com/flappySlothRelease/ The problem is that even though the FPS is ...
-2
votes
1answer
166 views

How should I start with Android development? I am basically a PHP HTML JAVASCRIPT developer [closed]

I am a PHP developer wanting to learn Android game programming. I tried java with ADT and android SDK, but I found Java confusing because of its complex Object-Oriented structure. I've heard we can ...
0
votes
2answers
68 views

JavaScript character direction delay [closed]

I am developing a top down game and I'm having trouble with a delay in switching from one character walk direction to another, particularly if the previous direction key is still being pressed by the ...
1
vote
2answers
103 views

Calculate tile ID on a Reus style world with canvas context.arc()

I need a bit of math help for my game. I'm using Javascript and the Canvas tag to create a circular world, think God Finger, and Reus. The current version of my game is here: ...
0
votes
2answers
177 views

Tweening multiple image objects in html5/js

Is there an optimal way to choose when tweening multiple images as a single image? For example let's say i have 10 preloaded image objects in my script, and i want to place them one on top of the ...
2
votes
1answer
178 views

How to make bullets follow a rotating sinewave pattern

I am trying to replicate the wave gun from Super Metroid where the bullets fly along a sine wave path. The cool part is that you can shoot in 8 directions and the bullet still follows the sine as if ...
2
votes
3answers
186 views

Is it more efficient to encode rotation in a spritesheet or rotate at runtime?

I'm developing a game with JavaScript and HTML5 and I'm wondering about the performance implications of sprite rotations. There are two ways that I know to rotate a sprite: Rotate the actual sprite ...
0
votes
1answer
89 views

How can I convert a Tiled level array to a 2D array?

For the code in my game, I want a 2D array which represents the map. I created an actual map with Tiled but it produces a 1D array. Is there any way to convert it into my desired format wothout ...
8
votes
3answers
319 views

How can I scale the number and challenge of enemies in an attack wave as the game progresses?

I'm currently making a defense game where enemies will spawn and attack the player's army. It's similar to a Tower Defense game, except there is only one level. The enemies will keep spawning until ...
0
votes
1answer
120 views

Why does my HTML5 game loop (with masking) run slowly?

I have a game loop like so: setInterval(function() { context.save(); context.rect(26, 144, 745, 400); context.clip(); context.drawImage(myImage, 100, 100, 900, 900); ...
1
vote
3answers
123 views

Canvas setTransform function clarification

I'm currently building some kind of fake-3D dungeon, and I'm facing some difficulties understanding the behavior of the setTransform() function. Here's my simplified code: var can = ...
2
votes
2answers
168 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
313 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
255 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 ...
1
vote
1answer
174 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, ...
1
vote
1answer
254 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 / ...
0
votes
1answer
61 views

How would one outline an alpha transparency layer in javscript and/or php? [duplicate]

I simply want an outline/edge detection of the character/item/object that is selected or doing something. I'm seeing lots of versions of this question for different languages, but I would appreciate ...
0
votes
1answer
182 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 ...
0
votes
0answers
105 views

detection of a circle inside a rectangle in html5 canvas

I've created this game where the player can hit space to make the circle float in certain way. the main goal of the game is let the circle enter the rectangle .I did this code to create a collision ...
1
vote
1answer
360 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 ...
1
vote
2answers
271 views

How can I list files in a folder from JavaScript in cocos2d-x?

I need to list all the files in the res folder from a JavaScript script in cocos2d-x. What would be the most efficient way to do this? To keep compatibility with Cocos2d-html5 a JavaScript-only ...
0
votes
1answer
109 views

Card Game Complex Hand Holder [duplicate]

I've been working on a card game project for a while and have just got into the hand holder. What is stopping me now is how to spread the cards linearly in a complex way. By complex, I mean it changes ...
0
votes
1answer
83 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
1answer
1k views

Is it possible to rotate an image on an HTML5 canvas, without rotating the whole canvas?

So I basically want to rotate single sprites on the canvas without rotating the whole canvas, is that someway possible. I also don't want to create a new canvas for each object I have. Also, it ...
1
vote
1answer
167 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
199 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 ...
1
vote
3answers
94 views

calculating step length with dividing a number that returns digits after the decimal point

Question: How can i get rounded numbers from calculations that returns digits after the decimal point. And all the numbers together will be the number that is divided from. Explanation: I am ...
0
votes
0answers
36 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 ...
0
votes
2answers
259 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
324 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 ...
1
vote
2answers
353 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 ...
0
votes
2answers
91 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
84 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 ...
0
votes
1answer
153 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 ...
1
vote
2answers
250 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
92 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 = ...
2
votes
2answers
167 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
214 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 ...
0
votes
1answer
97 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 ...
0
votes
0answers
215 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
125 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
148 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 ...
6
votes
1answer
253 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 ...
0
votes
2answers
235 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
137 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
199 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 ...