flow like the river

VISUALIZACION/node_modules/ngraph.forcelayout/test/insert.js

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+var test = require('tap').test;
+
+var dimensions = 2;
+var createQuadTree = require('../lib/codeGenerators/generateQuadTree')(dimensions);
+var Body = require('../lib/codeGenerators/generateCreateBody')(dimensions);
+var random = require('ngraph.random').random(42);
+
+test('insert and update update forces', function (t) {
+  var tree = createQuadTree({}, random);
+  var body = new Body();
+  var clone = JSON.parse(JSON.stringify(body));
+
+  tree.insertBodies([body]);
+  tree.updateBodyForce(body);
+  t.same(body, clone, 'The body should not be changed - there are no forces acting on it');
+  t.end();
+});
+
+test('it can get root', function (t) {
+  var tree = createQuadTree({}, random);
+  var body = new Body();
+
+  tree.insertBodies([body]);
+  var root = tree.getRoot();
+  t.ok(root, 'Root is present');
+  t.equal(root.body, body, 'Body is initialized');
+  t.end();
+});
+
+test('Two bodies repel each other', function (t) {
+  var tree = createQuadTree({}, random);
+  var bodyA = new Body(); bodyA.pos.x = 1; bodyA.pos.y = 0;
+  var bodyB = new Body(); bodyB.pos.x = 2; bodyB.pos.y = 0;
+
+  tree.insertBodies([bodyA, bodyB]);
+  tree.updateBodyForce(bodyA);
+  tree.updateBodyForce(bodyB);
+  // based on our physical model construction forces should be equivalent, with
+  // opposite sign:
+  t.ok(bodyA.force.x + bodyB.force.x === 0, 'Forces should be same, with opposite sign');
+  t.ok(bodyA.force.x !== 0, 'X-force for body A should not be zero');
+  t.ok(bodyB.force.x !== 0, 'X-force for body B should not be zero');
+  // On the other hand, our bodies should not move by Y axis:
+  t.ok(bodyA.force.y === 0, 'Y-force for body A should be zero');
+  t.ok(bodyB.force.y === 0, 'Y-force for body B should be zero');
+
+  t.end();
+});
+
+test('Can handle two bodies at the same location', function (t) {
+  var tree = createQuadTree({}, random);
+  var bodyA = new Body();
+  var bodyB = new Body();
+
+  tree.insertBodies([bodyA, bodyB]);
+  tree.updateBodyForce(bodyA);
+  tree.updateBodyForce(bodyB);
+
+  t.end();
+});
+
+test('it does not stuck', function(t) {
+  var count = 60000;
+  var bodies = [];
+
+  for (var i = 0; i < count; ++i) {
+    bodies.push(new Body(Math.random(), Math.random()));
+  }
+
+  var quadTree = createQuadTree({}, random);
+  quadTree.insertBodies(bodies);
+
+  bodies.forEach(function(body) {
+    quadTree.updateBodyForce(body);
+  });
+  t.ok(1);
+  t.end();
+});