A new feature of HTML5, allowing Javascript apps to have a drawing surface in the browser.

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5
votes
1answer
283 views

Roguelike 2D Collision Detection

I'm just a normal guy trying to do some basic collision detection but I suck at it. I either get stuck in a wall or I go in reverse in the wrong direction trying to update the player position to a non ...
-1
votes
1answer
201 views

Adding obstacles & collision to canvas game

I am trying to add some obstacles to the canvas game that I've got but something seems to be wrong and I can't seem to put my finger on it. I just want some simple walls here and there to make the ...
1
vote
1answer
163 views

svg spaceship game movement 2d

I've been searching for a way to make an svg box move to all directions using js. I have seen many tutorials on how to do it grid like, but I want it so have a square that can turn, move forward, ...
3
votes
0answers
310 views

Card Masking in Phaser

Good Day, I'm new to Phaser and still learning about it to. I am challenging my self to create a simple animation of a card flip somewhat realistic rather that making use of a scale. This is ...
0
votes
1answer
66 views

Rectangles clear each other when moving on canvas

I am having this problem after moving rectangles, they seem to delete one another. Most probably it is a problem with clearRect(...) method. This is the clean function I am using: clean: ...
1
vote
0answers
29 views

CocoonJS draws shadow around tiles

I am using CocoonJS launcher on iOS for a simple tiled game. Calling canvas drawImage for tiles adds a shadow or ghost border around tiles. See this screenshot: ...
1
vote
1answer
525 views

Cocos2D-JS Windows App in fullscreen mode (Win32)

I've been looking for a way to make my Cocos2D-JS app go into fullscreen mode, but there doesn't seem to be much documentation on Cocos2D-JS (or Cocos2D-x-js as some seem to call it.) This app is to ...
0
votes
0answers
70 views

Collision detection in JavaScript Canvas game - Issue with 'if' statements [duplicate]

I am currently developing a simple browser-based game and seem to be on the cusp of collision detection that doesn't just return the player to where they were before, but actually will slide them ...
3
votes
1answer
360 views

How can I create 2D, sprite-based reflections in HTML5 Canvas?

I'm trying to create simple reflections in a 2D, sprite-based game using HTML5. I'm looking to recreate an effect like the one you'd often see in GBA games, such as Pokemon Emerald and Mother 3: ...
1
vote
1answer
1k views

Rotate arrow on canvas

I need to draw a flow dynamically based on some user choices. In that flow I want to draw the choices (blue circles with number) and the directions of that choices (line and arrow). For example: node ...
0
votes
1answer
422 views

How to draw small sprite bigger?

I have created an image with the resolution of 25px(width)*34px(height) (I know it's unusual, however it doesn't bother me now). The problem is that when I try to display it by creating a bitmap, it ...
0
votes
0answers
30 views

Reverting 2d canvas?

I'm making a multiplayer game which involves drawing lines. It's based this game: http://curvefever.com/sites/default/files/resize/remote/ef86488088c618df13b34f8b87aafd4e-1107x808.jpg. The game is ...
3
votes
1answer
250 views

How to implement user friendly screen panning on 3D HTML canvas for RTS game

How can I get RTS map panning like how it was done in C&C red alert (with the mouse at the edge of the screen moves the screen in that direction) with a Babylon.js RTS game in the html canvas? ...
3
votes
1answer
813 views

Why would it be faster to render using multiple canvas elements?

This video suggests that rendering using multiple canvas elements helps performance. How does this work? The idea was to use one for the player, one for the enemies, another for the background, ...
1
vote
1answer
145 views

Set a different animation rate for moving player NOT using a sprite

I am trying to start making a simple game using HTML5 with a canvas and some JS. I have a player whose movement I am comfortable with, but the rate at which the player animates when it moves is too ...
1
vote
1answer
1k views

What is the difference between a Facebook Canvas and Facebook Web project?

I am making a game on cocos2d-JS for Facebook. What is the difference between Facebook Canvas & Facebook Web project. From what I can tell, Facebook Canvas ask for the secure url and Web ask for ...
3
votes
1answer
383 views

Shadows in html5 canvas game

I'd like to ask for reference. I met an article about how to cast shadows in games. I'm using html5 canvas (currently without webgl) with javascript for my projects. The article mentioned above is ...
1
vote
2answers
232 views

How to access bottom canvas layer in HTML?

I have such html: <div id="main_window"> <canvas id="canvas_hex_logic" width="200" height="100"></canvas> <canvas id="canvas_ground" width="200" height="100"></canvas> ...
0
votes
1answer
111 views

Initial force to achieve orbital velocity

I'm attempting to get asteroid to orbit a black hole that is asserting gravity. Some parts currently work, like the black hole asserting gravity, attracting asteroids in and destroying them. And ...
0
votes
1answer
748 views

Creating looping canvas animation (slot machine with reels)

I have a small assignment to create something like slot machine with spinning pictures. I have to use HTML5 Canvas. I would like to hear some opinions how this can be made simply and performantly. ...
1
vote
2answers
155 views

Offset during zooming to keep object within boundries

I have a simple zoom feature which lets the user zoom in and out. I'm having an issue how ever when i zoom out the object gets smaller to the point that the boundaries become broken. The idea is the ...
0
votes
1answer
952 views

Android Canvas 2D Game: Supporting multiple screen sizes/resolutions [duplicate]

I'm planning to develop a 2D game for android devices by using simple Canvas Surfaces (I know that OpenGL might be more efficient - but Canvas should definitely be enough for my type of game). I'm ...
2
votes
1answer
466 views

How do I procedurally create a directional light cone with an HTML canvas?

To create a directional light effect, I want to draw this kind of transparency mask on an HTML canvas (using context2d): I also want to be able to generate such a mask dynamically. I've tried using ...
0
votes
1answer
327 views

Map scrolling around the world

I am developing an TBS (turn based strategy) game. I have created a simple canvas renderer to render hexagonial map. I already implemented scrolling on the map. My current problem is that I want to ...
0
votes
4answers
317 views

How to handle a negative coordinate 2d map with a growing map size

I love this procedural generation theory and have been messing around with it. However I'm having trouble wrapping my head around how to store my map data. Usually I store my map data in a 2d array ...
4
votes
3answers
2k views

Procedurally Generated Top View 2D RPG Map Generation

Procedural generation is a fascinating concept and is gaining popularity in the gaming industry. The thought of playing a game that has new content every-time the game is played is very exciting to ...
0
votes
0answers
126 views

Drawing a object with Box2D and HTML5 canvas on current mouse position

I'm attempting to create a air hockey type game with HTML5 canvas and JavaScript, using Box2dWeb for the physics calculation. I need a way to draw the puck at the current mouse x and y position every ...
1
vote
1answer
789 views

Removing a previously rendered image on a canvas

I made a platformer using ctx.clearRect and ctx.fillRect, so each time the player moved I would just delete the previous position and draw him again. Now I'm working on importing my own art into the ...
0
votes
2answers
836 views

How to move an image back and forth with javascript

I currently am trying to make a baseball game and have this code here: http://jsfiddle.net/769BK/ I have the baseballX set to a decrement, and then I try increasing the value using baseballX++; but it ...
0
votes
2answers
2k views

How to move an object using X and Y coordinates in JavaScript

I am making a 2d baseball game with JavaScript and HTML5 and am trying to move an image that I have drawn with JavaScript like so: //canvas var c = document.getElementById("gameCanvas"); ...
1
vote
2answers
906 views

How can I make EaselJS' skew behave like canvas'?

The skew property of a bitmap in EaselJS (given as angle) rotates the image such that it also flattens. I'd like to skew it without "squashing" it, as canvas does. JSFiddles, to demonstrate: Canvas ...
1
vote
2answers
138 views

How do you account for zoom in a top down viewport?

I've been stumped on this for days so please forgive me if this question is in bad-form. I have a generic top-down RPG structure, and I want to create a zoomable Canvas viewport for it. I've read ...
1
vote
2answers
417 views

Canvas - darken sprites rendered by drawImage

I am implementing lighting in a tile engine, and I need a way to darken tiles, based on their light level. For the ground tiles, I can clear the context to black, then set the globalAlpha and use ...
-1
votes
1answer
136 views

creating an html5 game [closed]

I am working on a really simple online version of the parachute shooters game that was preprogrammed on old iPods. I'm pretty new to game development and so at first I tried to build the whole game ...
2
votes
1answer
444 views

How do I use createPattern with a spritesheet? [closed]

Say that I have a spritesheet like this And I want to use the dirt tile at (1, 1). I know that I can repeat an entire image using createPattern but how do I create the pattern from just the tile ...
-2
votes
2answers
161 views

collision detection algorithm issue

here is the jsfiddle i am working on so far : http://jsfiddle.net/TLYZS/ if you debug the code and check the collision function you can see that the collision is working fine when the user overlap ...
1
vote
2answers
2k views

Dealing with multiple animation state in one sprite sheet image using html5 canvas

I am recently creating a Game using html5 canvas .The player have multiple state it can walk jump kick and push and multiple other states my question is simple but after some deep research i couldn't ...
1
vote
1answer
658 views

JavaScript: Rotating a canvas around its center for a 2D sidescroller

I've been making a 2D sidescrolling game using JavaScript and HTML. The game is set in space, where the player character can fly around (Up, Down, Left and Right keys) and rotate the world around him ...
0
votes
0answers
73 views

HTML5 Canvas: Get rect coords after rotation (relative to screen)

update: function(delta) { for (var i = 0; i < this.bullets.length; i++) { this.bullets[i].velocity = this.bullets[i].speed * delta; this.bullets[i].contextX += ...
3
votes
1answer
7k views

HTML5 - Dynamic canvas grid for scrolling a big map

I've been working on different scrolling algorithms for my JS-based game. My main problem is that I need to draw a huge map and also have it scroll smoothly. I've made a few attempts and while they're ...
5
votes
3answers
542 views

How to do a genetic algorithm's chromosome which controls movements

First I would like to inform you that I'm french and 15 so my english is not very good. I've read some articles about genetic algorithms (GA) and since I discovered the HTML5's canvas element, I can ...
10
votes
5answers
6k 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 ...
4
votes
2answers
1k 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 ...
0
votes
1answer
143 views

What's the best way to time a character AI movement on android/java?

I'm creating an android game and I'm trying to figure out the best way to time a character position change, something like this: public void move() { //this.posX += 5; this.posY += 5; if ...
0
votes
1answer
553 views

2D to 3D perlin noise, I'm not sure I get it

I've been using 2d perlin noise to generate height maps for a little isometric terrain experiment. The noise value is directly related to the z-layer a tile will appear in: Math.floor(noise * 10). ...
-1
votes
2answers
921 views

How do I make a sprite blink on an HTML5 canvas?

I'm thinking of the flashing effect many games have when a character gets hit and takes damage. Something like overlaying a lighter color on visible sprite pixels for a second.
1
vote
2answers
151 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
1answer
68 views

Update function in html5 canvas game isn't working properly [closed]

Jsfiddle : http://jsfiddle.net/seekpunk/6eeKH/15/ the code : if (this.collection.length > 0) { if (((this.collection[0].blockX + this.collection[0].blockW) >= cw) || ...
1
vote
3answers
434 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
0answers
75 views

What would be a good way to scroll a large html canvas (that contains little repetition if any)

What would be a good way to scroll the content of a huge html5 canvas so that the scroll is crisp and smooth, and memory consumption (and cpu load or battery consumption) is also reasonable? any ...