CompoundShapes.js

/*
 * Copyright (c) 2016-2018 Ali Shakiba http://shakiba.me/planck.js
 * Copyright (c) 2006-2009 Erin Catto  http://www.box2d.org
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

// TODO_ERIN test joints on compounds.
planck.testbed('CompoundShapes', function(testbed) {
  var pl = planck, Vec2 = pl.Vec2, Transform = pl.Transform;
  var world = new pl.World(Vec2(0, -10));

  world.createBody(Vec2(0.0, 0.0)).createFixture(pl.Edge(Vec2(50.0, 0.0), Vec2(-50.0, 0.0)), 0.0);

  var circle1 = pl.Circle(Vec2(-0.5, 0.5), 0.5);
  var circle2 = pl.Circle(Vec2(0.5, 0.5), 0.5);

  for (var i = 0; i < 10; ++i) {
    var body = world.createDynamicBody({
      position : Vec2(pl.Math.random(-0.1, 0.1) + 5.0, 1.05 + 2.5 * i),
      angle : pl.Math.random(-Math.PI, Math.PI)
    });
    body.createFixture(circle1, 2.0);
    body.createFixture(circle2, 0.0);
  }

  var polygon1 = pl.Box(0.25, 0.5);
  var polygon2 = pl.Box(0.25, 0.5, Vec2(0.0, -0.5), 0.5 * Math.PI);

  for (var i = 0; i < 10; ++i) {
    var body = world.createDynamicBody({
      position : Vec2(pl.Math.random(-0.1, 0.1) - 5.0, 1.05 + 2.5 * i),
      angle : pl.Math.random(-Math.PI, Math.PI)
    });
    body.createFixture(polygon1, 2.0);
    body.createFixture(polygon2, 2.0);
  }

  var xf1 = pl.Transform();
  xf1.q.set(0.3524 * Math.PI);
  xf1.p = xf1.q.getXAxis();

  var triangle1 = pl.Polygon(Transform.mul(xf1, [Vec2(-1.0, 0.0), Vec2(1.0, 0.0), Vec2(0.0, 0.5)]));

  var xf2 = pl.Transform();
  xf2.q.set(-0.3524 * Math.PI);
  xf2.p = Vec2.neg(xf2.q.getXAxis());

  var triangle2 = pl.Polygon(Transform.mul(xf2, [Vec2(-1.0, 0.0), Vec2(1.0, 0.0), Vec2(0.0, 0.5)]));

  for (var i = 0; i < 10; ++i) {
    var body = world.createDynamicBody({
      position : Vec2(pl.Math.random(-0.1, 0.1), 2.05 + 2.5 * i),
      angle : 0.0
    });
    body.createFixture(triangle1, 2.0);
    body.createFixture(triangle2, 2.0);
  }

  var bottom = pl.Box(1.5, 0.15);
  var left = pl.Box(0.15, 2.7, Vec2(-1.45, 2.35), 0.2);
  var right = pl.Box(0.15, 2.7, Vec2(1.45, 2.35), -0.2);

  var container = world.createBody(Vec2(0.0, 2.0));
  container.createFixture(bottom, 4.0);
  container.createFixture(left, 4.0);
  container.createFixture(right, 4.0);

  return world;
});