text: "use strict";
  
  var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
  
  function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
  
  function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  console.clear();
  
  var TWOPI = Math.PI * 2;
  
  function distance(x1, y1, x2, y2) {
      var dx = x1 - x2;
      var dy = y1 - y2;
      return Math.sqrt(dx * dx + dy * dy);
  }
  
  var gravity = 0.5;
  
  // VNode class
  
  var VNode = function () {
      function VNode(node) {
          _classCallCheck(this, VNode);
  
          this.x = node.x || 0;
          this.y = node.y || 0;
          this.oldX = this.x;
          this.oldY = this.y;
          this.w = node.w || 2;
          this.angle = node.angle || 0;
          this.gravity = node.gravity || gravity;
          this.mass = node.mass || 1.0;
  
          this.color = node.color;
          this.letter = node.letter;
  
          this.pointerMove = node.pointerMove;
          this.fixed = node.fixed;
      }
      // verlet integration
  
  
      _createClass(VNode, [{
          key: 'integrate',
          value: function integrate(pointer) {
  
              if (this.lock && (!this.lockX || !this.lockY)) {
                  this.lockX = this.x;
                  this.lockY = this.y;
              }
  
              if (this.pointerMove && pointer && distance(this.x, this.y, pointer.x, pointer.y) < this.w + pointer.w) {
                  this.x += (pointer.x - this.x) / (this.mass * 18);
                  this.y += (pointer.y - this.y) / (this.mass * 18);
              } else if (this.lock) {
                  this.x += (this.lockX - this.x) * this.lock;
                  this.y += (this.lockY - this.y) * this.lock;
              }
  
              if (!this.fixed) {
                  var x = this.x;
                  var y = this.y;
                  this.x += this.x - this.oldX;
                  this.y += this.y - this.oldY + this.gravity;
                  this.oldX = x;
                  this.oldY = y;
              }
          }
      }, {
          key: 'set',
          value: function set(x, y) {
              this.oldX = this.x = x;
              this.oldY = this.y = y;
          }
          // draw node
  
      }, {
          key: 'draw',
          value: function draw(ctx) {
              if (!this.color) {
                  return;
              }
              // ctx.globalAlpha = 0.8;
              ctx.translate(this.x, this.y);
              ctx.rotate(this.angle);
              ctx.fillStyle = this.color;
  
              ctx.beginPath();
              if (this.letter) {
                  ctx.globalAlpha = 1;
                  ctx.rotate(Math.PI / 2);
  
                  ctx.rect(-7, 0, 14, 1);
  
                  ctx.textAlign = 'center';
                  ctx.textBaseline = 'middle';
                  ctx.font = 'bold 75px "Bebas Neue", monospace';
                  ctx.fillStyle = '#000';
                  ctx.fillText(this.letter, 0, this.w * .25 + 4);
  
                  ctx.fillStyle = this.color;
                  ctx.fillText(this.letter, 0, this.w * .25);
              } else {
                  ctx.globalAlpha = 0.2;
                  ctx.rect(-this.w, -this.w, this.w * 2, this.w * 2);
                  // ctx.arc(this.x, this.y, this.w, 0, 2 * Math.PI);
              }
              ctx.closePath();
              ctx.fill();
              ctx.setTransform(1, 0, 0, 1, 0, 0);
          }
      }]);
  
      return VNode;
  }();
  // constraint class
  
  
  var Constraint = function () {
      function Constraint(n0, n1, stiffness) {
          _classCallCheck(this, Constraint);
  
          this.n0 = n0;
          this.n1 = n1;
          this.dist = distance(n0.x, n0.y, n1.x, n1.y);
          this.stiffness = stiffness || 0.5;
          this.firstRun = true;
      }
      // solve constraint
  
  
      _createClass(Constraint, [{
          key: 'solve',
          value: function solve() {
              var dx = this.n0.x - this.n1.x;
              var dy = this.n0.y - this.n1.y;
  
              var newAngle = Math.atan2(dy, dx);
              this.n1.angle = newAngle;
  
              var currentDist = distance(this.n0.x, this.n0.y, this.n1.x, this.n1.y);
              var delta = this.stiffness * (currentDist - this.dist) / currentDist;
              dx *= delta;
              dy *= delta;
  
              if (this.firstRun) {
                  this.firstRun = false;
                  if (!this.n1.fixed) {
                      this.n1.x += dx;
                      this.n1.y += dy;
                  }
                  if (!this.n0.fixed) {
                      this.n0.x -= dx;
                      this.n0.y -= dy;
                  }
                  return;
              }
  
              var m1 = this.n0.mass + this.n1.mass;
              var m2 = this.n0.mass / m1;
              m1 = this.n1.mass / m1;
  
              if (!this.n1.fixed) {
                  this.n1.x += dx * m2;
                  this.n1.y += dy * m2;
              }
              if (!this.n0.fixed) {
                  this.n0.x -= dx * m1;
                  this.n0.y -= dy * m1;
              }
          }
          // draw constraint
  
      }, {
          key: 'draw',
          value: function draw(ctx) {
              ctx.globalAlpha = 0.9;
              ctx.beginPath();
              ctx.moveTo(this.n0.x, this.n0.y);
              ctx.lineTo(this.n1.x, this.n1.y);
              ctx.strokeStyle = "#fff";
              ctx.stroke();
          }
      }]);
  
      return Constraint;
  }();
  
  var Rope = function () {
      function Rope(rope) {
          _classCallCheck(this, Rope);
  
          var x = rope.x,
              y = rope.y,
              length = rope.length,
              points = rope.points,
              vertical = rope.vertical,
              fixedEnds = rope.fixedEnds,
              startNode = rope.startNode,
              letter = rope.letter,
              endNode = rope.endNode,
              stiffness = rope.stiffness,
              constrain = rope.constrain,
              gravity = rope.gravity,
              pointerMove = rope.pointerMove;
  
  
          this.stiffness = stiffness || 1;
          this.nodes = [];
          this.constraints = [];
          if (letter === ' ') {
              return this;
          }
  
          var dist = length / points;
  
          for (var i = 0, _last = points - 1; i < points; i++) {
  
              var size = letter && i === _last ? 15 : 2;
              var spacing = dist * i + size;
              var node = new VNode({
                  w: size,
                  mass: .1, //(i === last ? .5 : .1),
                  fixed: fixedEnds && (i === 0 || i === _last)
              });
  
              node = i === 0 && startNode || i === _last && endNode || node;
  
              node.gravity = gravity;
              //node.pointerMove = pointerMove;
  
              if (i === _last && letter) {
                  node.letter = letter;
                  node.color = '#FFF';
                  node.pointerMove = true;
              }
  
              node.oldX = node.x = x + (!vertical ? spacing : 0);
              node.oldY = node.y = y + (vertical ? spacing : 0);
  
              this.nodes.push(node);
          }
  
          constrain ? this.makeConstraints() : null;
      }
  
      _createClass(Rope, [{
          key: 'makeConstraints',
          value: function makeConstraints() {
              for (var i = 1; i < this.nodes.length; i++) {
                  this.constraints.push(new Constraint(this.nodes[i - 1], this.nodes[i], this.stiffness));
              }
          }
      }, {
          key: 'run',
          value: function run(pointer) {
              // integration
              var _iteratorNormalCompletion = true;
              var _didIteratorError = false;
              var _iteratorError = undefined;
  
              try {
                  for (var _iterator = this.nodes[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
                      var n = _step.value;
  
                      n.integrate(pointer);
                  }
                  // solve constraints
              } catch (err) {
                  _didIteratorError = true;
                  _iteratorError = err;
              } finally {
                  try {
                      if (!_iteratorNormalCompletion && _iterator.return) {
                          _iterator.return();
                      }
                  } finally {
                      if (_didIteratorError) {
                          throw _iteratorError;
                      }
                  }
              }
  
              for (var i = 0; i < 5; i++) {
                  var _iteratorNormalCompletion2 = true;
                  var _didIteratorError2 = false;
                  var _iteratorError2 = undefined;
  
                  try {
                      for (var _iterator2 = this.constraints[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
                          var _n = _step2.value;
  
                          _n.solve();
                      }
                  } catch (err) {
                      _didIteratorError2 = true;
                      _iteratorError2 = err;
                  } finally {
                      try {
                          if (!_iteratorNormalCompletion2 && _iterator2.return) {
                              _iterator2.return();
                          }
                      } finally {
                          if (_didIteratorError2) {
                              throw _iteratorError2;
                          }
                      }
                  }
              }
          }
  
          // draw(ctx) {
          //   // draw constraints
          //   this.constraints.forEach(n => {
          //     n.draw(ctx);
          //   });
          //   // draw nodes
          //   this.nodes.forEach(n => {
          //     n.draw(ctx);
          //   })
          // }
  
      }, {
          key: 'draw',
          value: function draw(ctx) {
  
              var vertices = Array.from(this.constraints).reduce(function (p, c, i, a) {
                  p.push(c.n0);
                  if (i == a.length - 1) p.push(c.n1);
                  return p;
              }, []);
  
              var h = function h(x, y) {
                  return Math.sqrt(x * x + y * y);
              };
              var tension = 0.5;
  
              if (!vertices.length) return;
  
              var controls = vertices.map(function () {
                  return null;
              });
              for (var i = 1; i < vertices.length - 1; ++i) {
                  var previous = vertices[i - 1];
                  var current = vertices[i];
                  var next = vertices[i + 1];
  
                  var rdx = next.x - previous.x,
                      rdy = next.y - previous.y,
                      rd = h(rdx, rdy),
                      dx = rdx / rd,
                      dy = rdy / rd;
  
                  var dp = h(current.x - previous.x, current.y - previous.y),
                      dn = h(current.x - next.x, current.y - next.y);
  
                  var cpx = current.x - dx * dp * tension,
                      cpy = current.y - dy * dp * tension,
                      cnx = current.x + dx * dn * tension,
                      cny = current.y + dy * dn * tension;
  
                  controls[i] = {
                      cp: {
                          x: cpx,
                          y: cpy
                      },
                      cn: {
                          x: cnx,
                          y: cny
                      }
                  };
              }
  
              controls[0] = {
                  cn: {
                      x: (vertices[0].x + controls[1].cp.x) / 2,
                      y: (vertices[0].y + controls[1].cp.y) / 2
                  }
              };
  
              controls[vertices.length - 1] = {
                  cp: {
                      x: (vertices[vertices.length - 1].x + controls[vertices.length - 2].cn.x) / 2,
                      y: (vertices[vertices.length - 1].y + controls[vertices.length - 2].cn.y) / 2
                  }
              };
  
              // Draw vertices & control points
              // ctx.fillStyle = 'blue';
              // ctx.fillRect(vertices[0].x, vertices[0].y, 4, 4);
              // for (let i = 1; i < vertices.length; ++i)
              // {
              // 	const v = vertices[i];
              // 	const ca = controls[i - 1];
              // 	const cb = controls[i];
              // 	ctx.fillStyle = 'blue';
              // 	ctx.fillRect(v.x, v.y, 4, 4);
              // 	ctx.fillStyle = 'green';
              // 	ctx.fillRect(ca.cn.x, ca.cn.y, 4, 4);
              // 	ctx.fillRect(cb.cp.x, cb.cp.y, 4, 4);
              // }
  
              ctx.globalAlpha = 0.9;
              ctx.beginPath();
              ctx.moveTo(vertices[0].x, vertices[0].y);
              for (var _i = 1; _i < vertices.length; ++_i) {
                  var v = vertices[_i];
                  var ca = controls[_i - 1];
                  var cb = controls[_i];
  
                  ctx.bezierCurveTo(ca.cn.x, ca.cn.y, cb.cp.x, cb.cp.y, v.x, v.y);
              }
              ctx.strokeStyle = 'white';
              ctx.stroke();
              ctx.closePath();
  
              // draw nodes
              this.nodes.forEach(function (n) {
                  n.draw(ctx);
              });
          }
      }]);
  
      return Rope;
  }();
  
  // Pointer class
  
  
  var Pointer = function (_VNode) {
      _inherits(Pointer, _VNode);
  
      function Pointer(canvas) {
          _classCallCheck(this, Pointer);
  
          var _this = _possibleConstructorReturn(this, (Pointer.__proto__ || Object.getPrototypeOf(Pointer)).call(this, {
              x: 0,
              y: 0,
              w: 8,
              color: '#F00',
              fixed: true
          }));
  
          _this.elem = canvas;
          canvas.addEventListener("mousemove", function (e) {
              return _this.move(e);
          }, false);
          canvas.addEventListener("touchmove", function (e) {
              return _this.move(e);
          }, false);
          return _this;
      }
  
      _createClass(Pointer, [{
          key: 'move',
          value: function move(e) {
              var touchMode = e.targetTouches;
              var pointer = e;
              if (touchMode) {
                  e.preventDefault();
                  pointer = touchMode[0];
              }
              var rect = this.elem.getBoundingClientRect();
              var cw = this.elem.width;
              var ch = this.elem.height;
  
              // get the scale based on actual width;
              var sx = cw / this.elem.offsetWidth;
              var sy = ch / this.elem.offsetHeight;
  
              this.x = (pointer.clientX - rect.left) * sx;
              this.y = (pointer.clientY - rect.top) * sy;
          }
      }]);
  
      return Pointer;
  }(VNode);
  
  var Scene = function () {
      function Scene(canvas) {
          _classCallCheck(this, Scene);
  
          this.draw = true;
          this.canvas = canvas;
          this.ctx = canvas.getContext('2d');
  
          this.nodes = new Set();
          this.constraints = new Set();
          this.ropes = [];
  
          this.pointer = new Pointer(canvas);
          this.nodes.add(this.pointer);
  
          this.run = this.run.bind(this);
          this.addRope = this.addRope.bind(this);
          this.add = this.add.bind(this);
      }
  
      // animation loop
  
  
      _createClass(Scene, [{
          key: 'run',
          value: function run() {
              var _this2 = this;
  
              // if (!canvas.isConnected) {
              //   return;
              // }
              requestAnimationFrame(this.run);
              // clear screen
              this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
  
              this.ropes.forEach(function (rope) {
                  rope.run(_this2.pointer);
              });
  
              this.ropes.forEach(function (rope) {
                  rope.draw(_this2.ctx);
              });
  
              // // integration
              // for (let n of nodes) {
              //   n.integrate(pointer);
              // }
              // solve constraints
              // for (let i = 0; i < 4; i++) {
              //   for (let n of constraints) {
              //     n.solve();
              //   }
              // }
              // // draw constraints
              // for (let n of constraints) {
              //   n.draw(ctx);
              // }
              // draw nodes
              var _iteratorNormalCompletion3 = true;
              var _didIteratorError3 = false;
              var _iteratorError3 = undefined;
  
              try {
                  for (var _iterator3 = this.nodes[Symbol.iterator](), _step3; !(_iteratorNormalCompletion3 = (_step3 = _iterator3.next()).done); _iteratorNormalCompletion3 = true) {
                      var n = _step3.value;
  
                      n.draw(this.ctx);
                  }
              } catch (err) {
                  _didIteratorError3 = true;
                  _iteratorError3 = err;
              } finally {
                  try {
                      if (!_iteratorNormalCompletion3 && _iterator3.return) {
                          _iterator3.return();
                      }
                  } finally {
                      if (_didIteratorError3) {
                          throw _iteratorError3;
                      }
                  }
              }
          }
      }, {
          key: 'addRope',
          value: function addRope(rope) {
              this.ropes.push(rope);
          }
      }, {
          key: 'add',
          value: function add(struct) {
  
              // load nodes
              for (var n in struct.nodes) {
                  this.nodes.add(struct.nodes[n]);
                  /*
                   const node = new Node(struct.nodes[n]);
                   struct.nodes[n].id = node;
                   nodes.add(node);
                   */
              }
  
              // load constraints
              for (var i = 0; i < struct.constraints.length; i++) {
                  var c = struct.constraints[i];
                  this.constraints.add(c);
                  /*
                   new Constraint(
                   struct.nodes[c[0]].id,
                   struct.nodes[c[1]].id
                   )
                   );
                   */
              }
          }
      }]);
  
      return Scene;
  }();
  
  // var scene = new Scene(document.querySelector('#canvas'));
  
  // scene.run();
  
  // const pointer = new Pointer(canvas);
  //
  // var phrase = '  CRMEB ';
  //
  // var r = new Rope({
  //     x: scene.canvas.width * 0.15,
  //     y: 40,
  //     length: scene.canvas.width * 0.7,
  //     points: phrase.length,
  //     vertical: false,
  //     dangleEnd: false,
  //     fixedEnds: true,
  //     stiffness: 1.5,
  //     constrain: false,
  //     gravity: 0.1
  // });
  //
  // var center = r.nodes.length / 2;
  //
  // var ropes = r.nodes.map(function (n, i) {
  //
  //     n.set(n.x, 60 + 80 * (1 - Math.abs((center - i) % center / center)));
  //
  //     if (phrase[i] !== ' ') {
  //
  //         //if ( i !== 0 && i !== r.nodes.length - 1 ) {
  //         return new Rope({
  //             startNode: n,
  //             x: n.x,
  //             y: n.y,
  //             length: 60,
  //             points: 4,
  //             letter: phrase[i],
  //             vertical: true,
  //             stiffness: 1, //2.5,,
  //             constrain: false,
  //             gravity: 0.5
  //         });
  //     }
  //
  //     //}
  // });
  //
  // var first = r.nodes[0];
  // var last = r.nodes[r.nodes.length - 1];
  //
  // first.set(2, -2);
  // last.set(scene.canvas.width - 2, -2);
  //
  // r.makeConstraints();
  //
  // ropes = ropes;
  // scene.addRope(r);
  // ropes.filter(function (r) {
  //     return r;
  // }).forEach(function (r) {
  //     r.makeConstraints();
  //     scene.addRope(r);
  // });