Ready to take your JavaScript development to the next level? Meet npm Enterprise - the ultimate in enterprise JavaScript. Learn more »


0.0.1 • Public • Published

crtrdg player

example player module for crtrdg. try it out to learn how to implement your own player module. this one is also used for simple examples.

goal of crtrdg-player

This is just an example module that shows how to implement [crtrdg-entity] for a Player module. This module is used in simple demos of crtrdg.js, but you will probably want to create your own Player module. Optionally, you can fork this one as a starting point.


  • node.js
  • browserify / beefy
  • crtrdg-gameloop (or possibly another method of animating the canvas with requestAnimationFrame that emits update and draw events)
  • crtrdg-keyboard

Getting started

Install node if you haven't already.

Install browserify and beefy:

npm install -g browserify beefy

Create an index.html file:

<!DOCTYPE html>
  <title>crtrdg gameloop test</title>

<canvas id="game"></canvas>

<script src="./bundle.js"></script>

Create a game.js file:

// use crtrdg-gameloop for animating to the canvas with requestAnimationFrame.
var Game = require('crtrdg-gameloop');

// require crtrdg-entity
var Player = require('./');

// require crtrdg-keyboard
var Keyboard = require('crtrdg-keyboard');

// initialize the game with the canvas id
// set the width, height, and default background color of the canvas
var game = new Game({
  canvasId: 'game',
  width: '800',
  height: '400',
  backgroundColor: '#E187B8'

// create keyboard
var keyboard = new Keyboard(game);

// create instance of Player
var player = new Player({
  position: { x: 10, y: 10 },
  size: { x: 10, y: 10 },
  color: '#fff'

// add the player to the game

// listen for update event.
// here you can do things like change position or watch for keyboard/mouse events
player.on('update', function(interval){



// listen for draw event.
// context is the canvas context, so you can draw on the canvas like usual.
player.on('draw', function(context){
  context.fillStyle = this.color;
  context.fillRect(this.position.x, this.position.y, this.size.x, this.size.y);

Purpose of crtrdg:

Almost every javascript game / animation library I've found bundles things like requestAnimationFrame polyfill, gameloop, entities, abstract drawing methods, keyboard/mouse input, vector math, and more into one entangled library. If I don't like how the library handles just one of those components, I'm stuck with dead library weight, and sometimes it's difficult to replace a library's methods.

So what if each element of 2d games were broken up into it's own modules / repositories?

With inspiration from voxel.js, crtrdg is a collection of javascript modules used for developing 2d games.

As I learned more about node.js, the core events module, and browserify, I realized the ideal api for making simple 2d games could be based on node's events module. So you'll see a lot of crtrdg modules exposing an api that includes .on('some event', function(){}), which seems to make a lot of sense for games.

Other crtrdg modules:


  • Fork this repository.
  • Create a branch for you changes.
  • Include tests if applicable.
  • Add/edit documentation for any changes.
  • Submit a pull request.






npm i crtrdg-player

Downloadsweekly downloads









last publish


  • avatar
Report a vulnerability