Questions tagged [html-canvas]

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

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votes
1answer
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How can I full-screen a Facebook canvas game?

Is there any way to allow the user to click a button on a Facebook canvas app and allow the app to go full-screen? If it's possible, is it permitted by Facebook?
4
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1answer
599 views

Animating DOM elements vs refreshing a single Canvas

A few years ago, when the HTML Canvas element was still kinda fresh, I wrote a small game in a rather "unusual" way: each game element had its own canvas, and frequently animated elements even had ...
4
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1answer
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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 ...
4
votes
1answer
3k views

Optimizing HTML5 canvas transformed drawing in Javascript

I am trying to optimize my HTML5 game engine and have noticed that currently a majority of the time taken in the game loop can be taken when drawing transformed tiles. I think this is because each ...
4
votes
1answer
588 views

HTML5 Canvas - Drawing with Floats

I'm trying to implement a game where you have car moving along a line in HTML5 Canvas. Using a little bit of trigonometrie I managed to get the right x and y coordinates to add to the coordinates of ...
4
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1answer
269 views

Updating code to include states

The Problem I am having a problem in that I am finding it hard to understand how to update my current code so that it uses states. I am creating a game, the game has a menu, each page in the game ...
3
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4answers
2k views

Why wouldn't one use Canvas for HTML 5 game development? [closed]

I'm just getting into the HTML 5 game development. I've discovered that some games seem to be created using just JS/CSS/HTML instead of the canvas. Since canvas seems to enjoy good browser ...
3
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2answers
5k views

Smooth animation on a persistently refreshing canvas

Yo everyone! I have been working on an Isometric Tile Game Engine in HTML5/Canvas for a little while now and I have a complete working game. Earlier today I looked back over my code and thought: "hmm,...
3
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1answer
2k 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 ...
3
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2answers
2k views

Client Side Logic vs Server Side Logic for HTML5 Game

I'm writing an HTML5 game that takes place in a single screen and does not have any data that would need to be saved (except for a score). I am writing all of my canvas logic on the front end. because ...
3
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2answers
854 views

Converting Doom maps to JSON [closed]

This is a really cool demo of a Canvas Doom Engine made back in 2006: http://canvex.lazyilluminati.com/84/play.xhtml Here is the e1m1 map in JSON format: http://canvex.lazyilluminati.com/84/map1.js ...
3
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1answer
4k views

OpenGL slower than Canvas

Up to 3 days ago I used a Canvas in a SurfaceView to do all the graphics operations but now I switched to OpenGL because my game went from 60FPS to 30/45 with the increase of the sprites in some ...
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2answers
5k views

Implementing a camera on HTML5 canvas?

I am trying to work out the best way of implementing a camera in my simple 2d game. The way it is structured at the moment is my game objects all have draw ...
3
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2answers
6k views

Receiving keyboard events on a canvas in Javascript

I need to receive keyboard events in a canvas element. Click events are received but key presses aren't. Here is my code which doesn't handle key events: ...
3
votes
3answers
519 views

Commonizing cycle time across different browsers for HTML5

Is there a good (accepted) method for "fixing" the cycle time within an HTML5 canvas game implementation? The game that I have been working on runs far quicker in Google Chrome than in other browsers ...
3
votes
1answer
4k views

JS Canvas - Creating 2D Game lighting effect like Terraria

I just started working with canvas in HTML5 and with javascript. I'm pretty satisfied with my game so far: http://xenopal.dk/game-v1.1/. But I'd like to implement lighting as well in the style of ...
3
votes
1answer
753 views

Multilayer game HTML5 canvas

I've have a problem with HTML5 canvas and using multiple layers. I'm using 3 layers. The first layer is where the player and the collision base objects are. And the second and the third layer have ...
3
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2answers
8k views

Android: Improving surfaceView?

I'm using Surfaceview in my Android app. I have two threads, one for UI and another for rendering and updading the UI. I am limiting my frames per second to 30 fps and have employed frame-skipping ...
3
votes
3answers
11k views

Slow Firefox Javascript Canvas Performance?

As a followup from a previous post, I have been trying to track down some slowdown I am having when drawing a scene using Javascript and the canvas element. I decided to narrow down my focus to a ...
3
votes
1answer
721 views

Best resources for Canvas Html 5 development

I am at a competition at work for who can make the best canvas game. Theme is a top down shooter... Winner gets dinner for free. Anyways I have been looking around looking for some good resources on ...
3
votes
2answers
623 views

How do I handle player collision with corners of a wall

I have implemented some basic wall collisions where I project the velocity vector onto the wall the player is colliding with so they slide across the wall. The problem I am having is when you slide ...
3
votes
1answer
2k 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-...
3
votes
2answers
341 views

Android Array Lag?

I am making a platform game for Android. It is sort of a tile based game. I added bullets and enemies with AI and a bunch of tile types. I created a simple map with no Enemies. Everything was running ...
3
votes
1answer
3k views

Canvas tile grid, hover effects, single tilesheet, etc

I'm currently in the process of building both the client and server side of an HTML5, canvas, and WebSocket game. This is what I have thus far for the client: http://jsfiddle.net/dDmTf/20/ Current ...
3
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2answers
517 views

Collision Detection doesnt work because some things move more than 1px at a time

I'm writing a 2d scrolling game in javascript using canvas and since I'm limited to setInterval running at minimum once every ms, I need to have some objects moving at greater than 1 pixel a second. I ...
3
votes
1answer
2k 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 ...
3
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1answer
703 views

Lighting in 2d isometric games

I want to add lighting to an isometric game that I'm working on. The closest I've come so far is to do a pass over the blocks on the floor and build up a light intensity matrix (based on how far each ...
3
votes
1answer
4k views

Dealing With Multiple requestAnimationFrame Calls

I am having issues with requestAnimationFrame calls stacking on top of each other. I am developing a platformer game, which has three separate functions that need animating (main menu, cutscene, in ...
3
votes
1answer
1k views

JavaScript - 2D Top-down Tile Collision Detection

I am developing a small Top-down Game (Much like the old Zelda Games) and I'm having an issue in terms of Collision detection (The actual theory itself rather than assigning Tiles as solid, etc.) I ...
3
votes
3answers
2k views

HTML5 Canvas Game Timer

How to create good timer for HTML5 Canvas games? I am using RequestAnimationFrame( http://paulirish.com/2011/requestanimationframe-for-smart-animating/ ) But object's move too fast. Something like ...
3
votes
1answer
1k views

HTML5 Canvas fillStyle as numbers not text

When drawing vector graphics in the canvas you set the fillStyle using an rgba string like this... context.fillStyle = "rgba(255, 223, 191, 1)"; Is it possible ...
3
votes
1answer
206 views

How do I rotate individual shapes on an html5 canvas?

So I am doing a basic Asteroids clone as an intro to HTML5 canvas. I want to be able to rotate the main player while leaving the other objects on screen alone. Currently I am using transform and ...
3
votes
1answer
458 views

DrawImage problem adjacent sprite?

Context I'm building a 2D game from scratch in JS. I'm drawing the map by using rpgmxp tilesets for the moment just to have some resources : Each tile is 32*32 pixels. I'm using canvas API with <...
3
votes
2answers
2k views

Javascript canvas rotating single sprite instead of entire context

I am trying to recreate asteroids, but I need the ship to rotate based on user input. I have w,a,s,d keys set to change the [pos] of the ship by 1 in the corresponding direction, but now, I need to ...
3
votes
1answer
618 views

SDD Inverse Kinematics with constraints

I have a question regarding my quest on onderstanding IK solvers. After viewing this movie on YouTube: https://www.youtube.com/watch?v=MvuO9ZHGr6k I started recreating it with JavaScript. Just 2d on ...
3
votes
1answer
504 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
1k 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 <...
3
votes
2answers
2k 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 ...
3
votes
1answer
3k views

Collision detection between a sprite and rectangle in canvas

I'm building a Javascript + canvas game which is essentially a platformer. I have the player all set up and he's running, jumping and falling, but I'm having trouble with the collision detection ...
3
votes
1answer
314 views

How do I show the current view from the viewport on my map?

I'm doing HTML5 Canvas development and currently have a large viewport (on the left) and a map (on the right). Like this: I need to show on the map what is currently being viewed in the left. And I'm ...
3
votes
2answers
4k views

HTML5 canvas screen to isometric coordinate conversion

I am trying to create an isometric game using HTML5 canvas, but don't know how to convert HTML5 canvas screen coordinates to isometric coordinates. My code now is: ...
3
votes
0answers
125 views

Optimising my Node.js/Js/Socket shooter game

So here I made a little shooter game just to play around with and on my pc it runs fine but for people with worse internet/less powerful computers (e.g at school/few friends of mine) it is quite laggy ...
3
votes
0answers
236 views

Check if a point is touching a user drawn curve in HTML5 canvas

I am having trouble detecting whether a ball is colliding with a red curve. The curve below is an example of what a user may draw on to the canvas. I can't think of any fast ways to detect collision ...
3
votes
0answers
566 views

Drawing a hexgrid on a canvas, yet making it zoom/scrollable?

I'm developing a game in JS / PHP. The game is basically a 2D plane (hexgrid) where each hex represents a location in space. In total, I'm drawing 25 * 25 hexes on a 1000x1000 canvas. I also draw ...
3
votes
1answer
1k views

Creating HTML5 Canvas Objects in Javascript [closed]

I'm currently trying to learn how to make HTML5 Canvas games with JavaScript. I would like to use object oriented JavaScript to manage the elements of the game, but i'm having trouble. I've done a lot ...
3
votes
0answers
273 views

Choosing a (browser) game environment [closed]

I apologise in advance if this post is something you've heard a million times already or seems like a trolling attempt. I just want some advice and I'm coming up short with my own Google searches. ...
2
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5answers
3k views

Are there any good html 5 mmo design tutorials? [closed]

Hey all. I got a rather inspired after playing gaia online's zOMG and wanted to revive an old project idea I've had laying around for a few years now. I'm looking to work with html5 (ie canvas, svg ...
2
votes
3answers
2k views

2D maps, how to structure?

I'm new to this. And I don't really understand 2D tile maps. The tutorials I've read use arrays, but doesn't this get really difficult to manage when they get big? And what if I want different ...
2
votes
3answers
2k views

Issues with shooting in a HTML5 platformer game

I'm coding a 2D sidescroller using only JavaScript and HTML5 canvas, and in my game I have two problems with shooting: 1) Player shoots continous stream of bullets. I want that player can shoot only ...
2
votes
2answers
390 views

How to draw objects that have a smaller Y axis first?

In my game there is a large 2D map of various objects. Example. As you see, upon creation objects of the same type (trees for example) are placed correctly, but objects of another type (enemies) are ...

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