cljsjs/liquidfun

[cljsjs/liquidfun "1.1.0-0"] ;; latest release

This jar comes with deps.cljs providing Google's liquidfun, a 2D physics simulator based on Box2D.

(ns liquidfun.example
  (:require cljsjs.liquidfun))

(let [w (js/b2World. (js/b2Vec2. -10 0))
  (js/console.log "A small world: " w))

Externs file

The externs file was generated from files in liquidfun's liquidfun/Box2D/lfjs/ directory:

for f in jsBindings/*/*.js jsBindings/*/*/*.js ; do (cat "${f}"; echo); done >tmp_js
cat tmp_js | sed 's/^  this/this/g' | grep -v "^ " | grep -v "=$" | \
  grep -v "Module.cwrap" | grep -v "= Offsets" | grep -v "this.buffer.set" | \
  sed 's/= null/= {}/g' | sed 's/= new .*/= {};/g' | grep -v "^$" \
  >liquidfun.ext.js

A few manual adjustments are needed. Delete this malformed block (it is not required):

b2PulleyJointDef.prototype.InitializeAndCreate  = function(bodyA, bodyB, groundAnchorA,
this.bodyA = bodyA;
this.bodyB = bodyB;
};

Add these missing props in b2RevoluteJointDef

this.bodyA = {};
this.bodyB = {};

Add this line inside b2World.prototype.QueryAABB and b2World.prototype.Raycast

callback.ReportFixture = function() {};

Add these lines inside b2World.prototype.SetContactListener

listener.BeginContactBody = function() {};
listener.EndContactBody = function() {};
listener.PreSolve = function() {};
listener.PostSolve = function() {};

Finally, silence the Closure compiler (advanced mode) warnings by deleting the relevant lines in prototype functions, or in constructors replacing function calls with constants. Total lines changed: 8.