1.0.1 • Published 9 years ago

lucy-b2 v1.0.1

Weekly downloads
4
License
Zlib
Repository
github
Last release
9 years ago

Lucy b2 Build Status

Box2D by Erin Catto with google's particle simulation liquidfun for node.js.

This fork

Fork from box2d.js.

Due to the fact that we are not creating sub-classes of C++ classes, we do not need to use 'b2' prefix to separate namespaces so this prefix has been removed.

// Instead of writing box2d.b2Vec2
// Write this:
const b2 = require ( 'lucy-b2' )
let gravity = new b2.Vec2  ( 0, -9.8 )
let world   = new b2.World ( gravity )
// ...
let shape = new b2.PolygonShape

Documentation

Example

Here is a falling ball simulation.

'use strict'
const b2 = require ( 'lucy-b2' )

// Create world
let gravity = new b2.Vec2  ( 0, -9.8 )
let world   = new b2.World ( gravity )

// Define body
let bodyDef = new b2.BodyDef
bodyDef.type = b2.BodyType.dynamicBody

// Create body with definition
let body = world.CreateBody ( bodyDef )

// Define fixture
let fixDef = new b2.FixtureDef
fixDef.density     = 1.0
fixDef.friction    = 0.2
fixDef.restitution = 0.8

let shape = new b2.PolygonShape
shape.SetAsBox ( 0.1, 0.1 )

fixDef.shape = shape

// Create fixture
body.CreateFixture ( fixDef )

// Move body into initial position ( and rotation )
body.SetTransform ( 0, 2, 0 )

// Run simulation
for ( let i = 0; i < 10; i++ )
{ world.Step ( 1/60, 10, 10 )
  console.log ( body.GetPosition ().y )
}

Installation

npm install lucy-b2 --save

Tests

npm test

Contributing

Please see box2d.js for contributions. The port from this library is just a few Regexp executed on the minified JS version and a wrapper for node.js.

Please use 'jessy style' if you want to write some unit tests for lucy-b2...

Release History

  • 1.0.1 (2015-09-22) Fixed readme.
  • 1.0.0 (2015-09-09) Initial release.