planck-js/test/BasicTest.js

2D physics engine for JavaScript/HTML5 game development

var expect = require('./testutil/expect');
var sinon = require('sinon');

var Vec2 = require('../lib/common/Vec2');
var Circle = require('../lib/shape/CircleShape');
var Body = require('../lib/Body');
var Fixture = require('../lib/Fixture');
var World = require('../lib/World');

describe('Basic', function() {

  it('World', function() {

    var world = new World();

    var circle = new Circle();
    circle.SetRadius(1);

    var b1 = world.CreateBody({
      position : Vec2(0, 0),
      type : 'dynamic'
    });

    b1.CreateFixture(circle);

    expect(b1.GetFixtureList().GetType()).be('circle');
    expect(b1.GetWorld()).be(world);
    expect(world.GetBodyList()).be(b1);

    b1.ApplyForceToCenter(Vec2(1, 0), true);

    var b2 = world.CreateBody({
      position : Vec2(2, 0),
      type : 'dynamic'
    })
    b2.CreateFixture(circle);
    b2.ApplyForceToCenter(Vec2(-1, 0), true);

    world.Step(1 / 20);

//    console.log(b2.GetPosition());

    var p = b1.GetPosition();
    expect(p.x).near(0.0025);
    expect(p.y).near(0.0);
  });

});