# Crafty JS 
Crafty is a JavaScript game library that can help you create games in a structured way…
Key Features:
- Entities & Components - A clean and decoupled way to organize game elements. No inheritance needed!
- Eventbinding - Event system for custom events that can be triggered whenever, whatever and bound just as easily.
- No dom manipulation or custom drawing routines required.
Other Goodies:
- Thriving community - Help is readily available in the forum.
- Community modules - A growing collection of user-generated code you can use.
- Pure JavaScript - No magic. Works in all major browsers and can be combined with your favorite js library.
Using Crafty
A simple game of pong:
Crafty.init(600, 300);
Crafty.background('rgb(127,127,127)');
//Paddles
Crafty.e("Paddle, 2D, DOM, Color, Multiway")
.color('rgb(255,0,0)')
.attr({ x: 20, y: 100, w: 10, h: 100 })
.multiway(200, { W: -90, S: 90 });
Crafty.e("Paddle, 2D, DOM, Color, Multiway")
.color('rgb(0,255,0)')
.attr({ x: 580, y: 100, w: 10, h: 100 })
.multiway(200, { UP_ARROW: -90, DOWN_ARROW: 90 });
//Ball
Crafty.e("2D, DOM, Color, Collision")
.color('rgb(0,0,255)')
.attr({ x: 300, y: 150, w: 10, h: 10,
dX: Crafty.math.randomInt(2, 5),
dY: Crafty.math.randomInt(2, 5) })
.bind('UpdateFrame', function () {
//hit floor or roof
if (this.y <= 0, this.y >= 290)
this.dY *= -1;
// hit left or right boundary
if (this.x > 600) {
this.x = 300;
Crafty("LeftPoints").each(function () {
this.text(++this.points + " Points") });
}
if (this.x < 10) {
this.x = 300;
Crafty("RightPoints").each(function () {
this.text(++this.points + " Points") });
}
this.x += this.dX;
this.y += this.dY;
})
.onHit('Paddle', function () {
this.dX *= -1;
});
//Score boards
Crafty.e("LeftPoints, DOM, 2D, Text")
.attr({ x: 20, y: 20, w: 100, h: 20, points: 0 })
.text("0 Points");
Crafty.e("RightPoints, DOM, 2D, Text")
.attr({ x: 515, y: 20, w: 100, h: 20, points: 0 })
.text("0 Points");
Left paddle is controlled by W & S, right paddle by UpArrow & DownArrow.
Check it out online and try to modify it yourself here.
Developing
If you want to fix a bug, please submit a pull request against the development branch. Some guides to help you can be found on the wiki
If you would like to make larger contributions please catch us in the forum and we will help you get started. Much appreciated :-)
Quick build instructions
The easiest way to build crafty is to use gruntjs, which requires node and npm. If you have grunt, node, and npm already installed, then run npm install from Crafty's root directory. (This will pull down about 30MB of node packages.) From then on, just run grunt to build.
You can also use yarn instead of npm.