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frontend/node_modules/@turf/shortest-path/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2017 TurfJS
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

frontend/node_modules/@turf/shortest-path/README.md

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+# @turf/shortest-path
+
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+## shortestPath
+
+Returns the shortest [path][1] from [start][2] to [end][2] without colliding with
+any [Feature][3] in [ obstacles][4]
+
+**Parameters**
+
+-   `start` **[Coord][5]** point
+-   `end` **[Coord][5]** point
+-   `options` **[Object][6]** optional parameters (optional, default `{}`)
+    -   `options.obstacles` **([Geometry][7] \| [Feature][8] \| [FeatureCollection][9]&lt;[Polygon][10]>)?** areas which path cannot travel
+    -   `options.minDistance` **[number][11]?** minimum distance between shortest path and obstacles
+    -   `options.units` **[string][12]** unit in which resolution & minimum distance will be expressed in; it can be degrees, radians, miles, kilometers, ... (optional, default `'kilometers'`)
+    -   `options.resolution` **[number][11]** distance between matrix points on which the path will be calculated (optional, default `100`)
+
+**Examples**
+
+```javascript
+var start = [-5, -6];
+var end = [9, -6];
+var options = {
+  obstacles: turf.polygon([[[0, -7], [5, -7], [5, -3], [0, -3], [0, -7]]])
+};
+
+var path = turf.shortestPath(start, end, options);
+
+//addToMap
+var addToMap = [start, end, options.obstacles, path];
+```
+
+Returns **[Feature][8]&lt;[LineString][13]>** shortest path between start and end
+
+[1]: https://tools.ietf.org/html/rfc7946#section-3.1.4
+
+[2]: https://tools.ietf.org/html/rfc7946#section-3.1.2
+
+[3]: https://tools.ietf.org/html/rfc7946#section-3.2
+
+[4]: FeatureCollection<Polygon>
+
+[5]: https://tools.ietf.org/html/rfc7946#section-3.1.1
+
+[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
+
+[7]: https://tools.ietf.org/html/rfc7946#section-3.1
+
+[8]: https://tools.ietf.org/html/rfc7946#section-3.2
+
+[9]: https://tools.ietf.org/html/rfc7946#section-3.3
+
+[10]: https://tools.ietf.org/html/rfc7946#section-3.1.6
+
+[11]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
+
+[12]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
+
+[13]: https://tools.ietf.org/html/rfc7946#section-3.1.4
+
+<!-- This file is automatically generated. Please don't edit it directly:
+if you find an error, edit the source file (likely index.js), and re-run
+./scripts/generate-readmes in the turf project. -->
+
+---
+
+This module is part of the [Turfjs project](http://turfjs.org/), an open source
+module collection dedicated to geographic algorithms. It is maintained in the
+[Turfjs/turf](https://github.com/Turfjs/turf) repository, where you can create
+PRs and issues.
+
+### Installation
+
+Install this module individually:
+
+```sh
+$ npm install @turf/shortest-path
+```
+
+Or install the Turf module that includes it as a function:
+
+```sh
+$ npm install @turf/turf
+```

frontend/node_modules/@turf/shortest-path/dist/es/index.js

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+import bbox from '@turf/bbox';
+import booleanPointInPolygon from '@turf/boolean-point-in-polygon';
+import distance from '@turf/distance';
+import scale from '@turf/transform-scale';
+import cleanCoords from '@turf/clean-coords';
+import bboxPolygon from '@turf/bbox-polygon';
+import { getCoord, getType, getGeom } from '@turf/invariant';
+import { isObject, featureCollection, isNumber, point, feature, lineString } from '@turf/helpers';
+
+// javascript-astar 0.4.1
+// http://github.com/bgrins/javascript-astar
+// Freely distributable under the MIT License.
+// Implements the astar search algorithm in javascript using a Binary Heap.
+// Includes Binary Heap (with modifications) from Marijn Haverbeke.
+// http://eloquentjavascript.net/appendix2.html
+
+function pathTo(node) {
+  var curr = node,
+    path = [];
+  while (curr.parent) {
+    path.unshift(curr);
+    curr = curr.parent;
+  }
+  return path;
+}
+
+function getHeap() {
+  return new BinaryHeap(function (node) {
+    return node.f;
+  });
+}
+
+/**
+ * Astar
+ * @private
+ */
+var astar = {
+  /**
+   * Perform an A* Search on a graph given a start and end node.
+   *
+   * @private
+   * @memberof astar
+   * @param {Graph} graph Graph
+   * @param {GridNode} start Start
+   * @param {GridNode} end End
+   * @param {Object} [options] Options
+   * @param {bool} [options.closest] Specifies whether to return the path to the closest node if the target is unreachable.
+   * @param {Function} [options.heuristic] Heuristic function (see astar.heuristics).
+   * @returns {Object} Search
+   */
+  search: function (graph, start, end, options) {
+    graph.cleanDirty();
+    options = options || {};
+    var heuristic = options.heuristic || astar.heuristics.manhattan,
+      closest = options.closest || false;
+
+    var openHeap = getHeap(),
+      closestNode = start; // set the start node to be the closest if required
+
+    start.h = heuristic(start, end);
+
+    openHeap.push(start);
+
+    while (openHeap.size() > 0) {
+      // Grab the lowest f(x) to process next.  Heap keeps this sorted for us.
+      var currentNode = openHeap.pop();
+
+      // End case -- result has been found, return the traced path.
+      if (currentNode === end) {
+        return pathTo(currentNode);
+      }
+
+      // Normal case -- move currentNode from open to closed, process each of its neighbors.
+      currentNode.closed = true;
+
+      // Find all neighbors for the current node.
+      var neighbors = graph.neighbors(currentNode);
+
+      for (var i = 0, il = neighbors.length; i < il; ++i) {
+        var neighbor = neighbors[i];
+
+        if (neighbor.closed || neighbor.isWall()) {
+          // Not a valid node to process, skip to next neighbor.
+          continue;
+        }
+
+        // The g score is the shortest distance from start to current node.
+        // We need to check if the path we have arrived at this neighbor is the shortest one we have seen yet.
+        var gScore = currentNode.g + neighbor.getCost(currentNode),
+          beenVisited = neighbor.visited;
+
+        if (!beenVisited || gScore < neighbor.g) {
+          // Found an optimal (so far) path to this node.  Take score for node to see how good it is.
+          neighbor.visited = true;
+          neighbor.parent = currentNode;
+          neighbor.h = neighbor.h || heuristic(neighbor, end);
+          neighbor.g = gScore;
+          neighbor.f = neighbor.g + neighbor.h;
+          graph.markDirty(neighbor);
+          if (closest) {
+            // If the neighbour is closer than the current closestNode or if it's equally close but has
+            // a cheaper path than the current closest node then it becomes the closest node
+            if (
+              neighbor.h < closestNode.h ||
+              (neighbor.h === closestNode.h && neighbor.g < closestNode.g)
+            ) {
+              closestNode = neighbor;
+            }
+          }
+
+          if (!beenVisited) {
+            // Pushing to heap will put it in proper place based on the 'f' value.
+            openHeap.push(neighbor);
+          } else {
+            // Already seen the node, but since it has been rescored we need to reorder it in the heap
+            openHeap.rescoreElement(neighbor);
+          }
+        }
+      }
+    }
+
+    if (closest) {
+      return pathTo(closestNode);
+    }
+
+    // No result was found - empty array signifies failure to find path.
+    return [];
+  },
+  // See list of heuristics: http://theory.stanford.edu/~amitp/GameProgramming/Heuristics.html
+  heuristics: {
+    manhattan: function (pos0, pos1) {
+      var d1 = Math.abs(pos1.x - pos0.x);
+      var d2 = Math.abs(pos1.y - pos0.y);
+      return d1 + d2;
+    },
+    diagonal: function (pos0, pos1) {
+      var D = 1;
+      var D2 = Math.sqrt(2);
+      var d1 = Math.abs(pos1.x - pos0.x);
+      var d2 = Math.abs(pos1.y - pos0.y);
+      return D * (d1 + d2) + (D2 - 2 * D) * Math.min(d1, d2);
+    },
+  },
+  cleanNode: function (node) {
+    node.f = 0;
+    node.g = 0;
+    node.h = 0;
+    node.visited = false;
+    node.closed = false;
+    node.parent = null;
+  },
+};
+
+/**
+ * A graph memory structure
+ *
+ * @private
+ * @param {Array} gridIn 2D array of input weights
+ * @param {Object} [options] Options
+ * @param {boolean} [options.diagonal] Specifies whether diagonal moves are allowed
+ * @returns {void} Graph
+ */
+function Graph(gridIn, options) {
+  options = options || {};
+  this.nodes = [];
+  this.diagonal = !!options.diagonal;
+  this.grid = [];
+  for (var x = 0; x < gridIn.length; x++) {
+    this.grid[x] = [];
+
+    for (var y = 0, row = gridIn[x]; y < row.length; y++) {
+      var node = new GridNode(x, y, row[y]);
+      this.grid[x][y] = node;
+      this.nodes.push(node);
+    }
+  }
+  this.init();
+}
+
+Graph.prototype.init = function () {
+  this.dirtyNodes = [];
+  for (var i = 0; i < this.nodes.length; i++) {
+    astar.cleanNode(this.nodes[i]);
+  }
+};
+
+Graph.prototype.cleanDirty = function () {
+  for (var i = 0; i < this.dirtyNodes.length; i++) {
+    astar.cleanNode(this.dirtyNodes[i]);
+  }
+  this.dirtyNodes = [];
+};
+
+Graph.prototype.markDirty = function (node) {
+  this.dirtyNodes.push(node);
+};
+
+Graph.prototype.neighbors = function (node) {
+  var ret = [],
+    x = node.x,
+    y = node.y,
+    grid = this.grid;
+
+  // West
+  if (grid[x - 1] && grid[x - 1][y]) {
+    ret.push(grid[x - 1][y]);
+  }
+
+  // East
+  if (grid[x + 1] && grid[x + 1][y]) {
+    ret.push(grid[x + 1][y]);
+  }
+
+  // South
+  if (grid[x] && grid[x][y - 1]) {
+    ret.push(grid[x][y - 1]);
+  }
+
+  // North
+  if (grid[x] && grid[x][y + 1]) {
+    ret.push(grid[x][y + 1]);
+  }
+
+  if (this.diagonal) {
+    // Southwest
+    if (grid[x - 1] && grid[x - 1][y - 1]) {
+      ret.push(grid[x - 1][y - 1]);
+    }
+
+    // Southeast
+    if (grid[x + 1] && grid[x + 1][y - 1]) {
+      ret.push(grid[x + 1][y - 1]);
+    }
+
+    // Northwest
+    if (grid[x - 1] && grid[x - 1][y + 1]) {
+      ret.push(grid[x - 1][y + 1]);
+    }
+
+    // Northeast
+    if (grid[x + 1] && grid[x + 1][y + 1]) {
+      ret.push(grid[x + 1][y + 1]);
+    }
+  }
+
+  return ret;
+};
+
+Graph.prototype.toString = function () {
+  var graphString = [],
+    nodes = this.grid, // when using grid
+    rowDebug,
+    row,
+    y,
+    l;
+  for (var x = 0, len = nodes.length; x < len; x++) {
+    rowDebug = [];
+    row = nodes[x];
+    for (y = 0, l = row.length; y < l; y++) {
+      rowDebug.push(row[y].weight);
+    }
+    graphString.push(rowDebug.join(" "));
+  }
+  return graphString.join("\n");
+};
+
+function GridNode(x, y, weight) {
+  this.x = x;
+  this.y = y;
+  this.weight = weight;
+}
+
+GridNode.prototype.toString = function () {
+  return "[" + this.x + " " + this.y + "]";
+};
+
+GridNode.prototype.getCost = function (fromNeighbor) {
+  // Take diagonal weight into consideration.
+  if (fromNeighbor && fromNeighbor.x !== this.x && fromNeighbor.y !== this.y) {
+    return this.weight * 1.41421;
+  }
+  return this.weight;
+};
+
+GridNode.prototype.isWall = function () {
+  return this.weight === 0;
+};
+
+function BinaryHeap(scoreFunction) {
+  this.content = [];
+  this.scoreFunction = scoreFunction;
+}
+
+BinaryHeap.prototype = {
+  push: function (element) {
+    // Add the new element to the end of the array.
+    this.content.push(element);
+
+    // Allow it to sink down.
+    this.sinkDown(this.content.length - 1);
+  },
+  pop: function () {
+    // Store the first element so we can return it later.
+    var result = this.content[0];
+    // Get the element at the end of the array.
+    var end = this.content.pop();
+    // If there are any elements left, put the end element at the
+    // start, and let it bubble up.
+    if (this.content.length > 0) {
+      this.content[0] = end;
+      this.bubbleUp(0);
+    }
+    return result;
+  },
+  remove: function (node) {
+    var i = this.content.indexOf(node);
+
+    // When it is found, the process seen in 'pop' is repeated
+    // to fill up the hole.
+    var end = this.content.pop();
+
+    if (i !== this.content.length - 1) {
+      this.content[i] = end;
+
+      if (this.scoreFunction(end) < this.scoreFunction(node)) {
+        this.sinkDown(i);
+      } else {
+        this.bubbleUp(i);
+      }
+    }
+  },
+  size: function () {
+    return this.content.length;
+  },
+  rescoreElement: function (node) {
+    this.sinkDown(this.content.indexOf(node));
+  },
+  sinkDown: function (n) {
+    // Fetch the element that has to be sunk.
+    var element = this.content[n];
+
+    // When at 0, an element can not sink any further.
+    while (n > 0) {
+      // Compute the parent element's index, and fetch it.
+      var parentN = ((n + 1) >> 1) - 1,
+        parent = this.content[parentN];
+      // Swap the elements if the parent is greater.
+      if (this.scoreFunction(element) < this.scoreFunction(parent)) {
+        this.content[parentN] = element;
+        this.content[n] = parent;
+        // Update 'n' to continue at the new position.
+        n = parentN;
+        // Found a parent that is less, no need to sink any further.
+      } else {
+        break;
+      }
+    }
+  },
+  bubbleUp: function (n) {
+    // Look up the target element and its score.
+    var length = this.content.length,
+      element = this.content[n],
+      elemScore = this.scoreFunction(element);
+
+    while (true) {
+      // Compute the indices of the child elements.
+      var child2N = (n + 1) << 1,
+        child1N = child2N - 1;
+      // This is used to store the new position of the element, if any.
+      var swap = null,
+        child1Score;
+      // If the first child exists (is inside the array)...
+      if (child1N < length) {
+        // Look it up and compute its score.
+        var child1 = this.content[child1N];
+        child1Score = this.scoreFunction(child1);
+
+        // If the score is less than our element's, we need to swap.
+        if (child1Score < elemScore) {
+          swap = child1N;
+        }
+      }
+
+      // Do the same checks for the other child.
+      if (child2N < length) {
+        var child2 = this.content[child2N],
+          child2Score = this.scoreFunction(child2);
+        if (child2Score < (swap === null ? elemScore : child1Score)) {
+          swap = child2N;
+        }
+      }
+
+      // If the element needs to be moved, swap it, and continue.
+      if (swap !== null) {
+        this.content[n] = this.content[swap];
+        this.content[swap] = element;
+        n = swap;
+        // Otherwise, we are done.
+      } else {
+        break;
+      }
+    }
+  },
+};
+
+/**
+ * Returns the shortest {@link LineString|path} from {@link Point|start} to {@link Point|end} without colliding with
+ * any {@link Feature} in {@link FeatureCollection<Polygon>| obstacles}
+ *
+ * @name shortestPath
+ * @param {Coord} start point
+ * @param {Coord} end point
+ * @param {Object} [options={}] optional parameters
+ * @param {Geometry|Feature|FeatureCollection<Polygon>} [options.obstacles] areas which path cannot travel
+ * @param {number} [options.minDistance] minimum distance between shortest path and obstacles
+ * @param {string} [options.units='kilometers'] unit in which resolution & minimum distance will be expressed in; it can be degrees, radians, miles, kilometers, ...
+ * @param {number} [options.resolution=100] distance between matrix points on which the path will be calculated
+ * @returns {Feature<LineString>} shortest path between start and end
+ * @example
+ * var start = [-5, -6];
+ * var end = [9, -6];
+ * var options = {
+ *   obstacles: turf.polygon([[[0, -7], [5, -7], [5, -3], [0, -3], [0, -7]]])
+ * };
+ *
+ * var path = turf.shortestPath(start, end, options);
+ *
+ * //addToMap
+ * var addToMap = [start, end, options.obstacles, path];
+ */
+function shortestPath(start, end, options) {
+  // Optional parameters
+  options = options || {};
+  if (!isObject(options)) throw new Error("options is invalid");
+  var resolution = options.resolution;
+  var minDistance = options.minDistance;
+  var obstacles = options.obstacles || featureCollection([]);
+
+  // validation
+  if (!start) throw new Error("start is required");
+  if (!end) throw new Error("end is required");
+  if ((resolution && !isNumber(resolution)) || resolution <= 0)
+    throw new Error("options.resolution must be a number, greater than 0");
+  if (minDistance)
+    throw new Error("options.minDistance is not yet implemented");
+
+  // Normalize Inputs
+  var startCoord = getCoord(start);
+  var endCoord = getCoord(end);
+  start = point(startCoord);
+  end = point(endCoord);
+
+  // Handle obstacles
+  switch (getType(obstacles)) {
+    case "FeatureCollection":
+      if (obstacles.features.length === 0)
+        return lineString([startCoord, endCoord]);
+      break;
+    case "Polygon":
+      obstacles = featureCollection([feature(getGeom(obstacles))]);
+      break;
+    default:
+      throw new Error("invalid obstacles");
+  }
+
+  // define path grid area
+  var collection = obstacles;
+  collection.features.push(start);
+  collection.features.push(end);
+  var box = bbox(scale(bboxPolygon(bbox(collection)), 1.15)); // extend 15%
+  if (!resolution) {
+    var width = distance([box[0], box[1]], [box[2], box[1]], options);
+    resolution = width / 100;
+  }
+  collection.features.pop();
+  collection.features.pop();
+
+  var west = box[0];
+  var south = box[1];
+  var east = box[2];
+  var north = box[3];
+
+  var xFraction = resolution / distance([west, south], [east, south], options);
+  var cellWidth = xFraction * (east - west);
+  var yFraction = resolution / distance([west, south], [west, north], options);
+  var cellHeight = yFraction * (north - south);
+
+  var bboxHorizontalSide = east - west;
+  var bboxVerticalSide = north - south;
+  var columns = Math.floor(bboxHorizontalSide / cellWidth);
+  var rows = Math.floor(bboxVerticalSide / cellHeight);
+  // adjust origin of the grid
+  var deltaX = (bboxHorizontalSide - columns * cellWidth) / 2;
+  var deltaY = (bboxVerticalSide - rows * cellHeight) / 2;
+
+  // loop through points only once to speed up process
+  // define matrix grid for A-star algorithm
+  var pointMatrix = [];
+  var matrix = [];
+
+  var closestToStart = [];
+  var closestToEnd = [];
+  var minDistStart = Infinity;
+  var minDistEnd = Infinity;
+  var currentY = north - deltaY;
+  var r = 0;
+  while (currentY >= south) {
+    // var currentY = south + deltaY;
+    var matrixRow = [];
+    var pointMatrixRow = [];
+    var currentX = west + deltaX;
+    var c = 0;
+    while (currentX <= east) {
+      var pt = point([currentX, currentY]);
+      var isInsideObstacle = isInside(pt, obstacles);
+      // feed obstacles matrix
+      matrixRow.push(isInsideObstacle ? 0 : 1); // with javascript-astar
+      // matrixRow.push(isInsideObstacle ? 1 : 0); // with astar-andrea
+      // map point's coords
+      pointMatrixRow.push(currentX + "|" + currentY);
+      // set closest points
+      var distStart = distance(pt, start);
+      // if (distStart < minDistStart) {
+      if (!isInsideObstacle && distStart < minDistStart) {
+        minDistStart = distStart;
+        closestToStart = { x: c, y: r };
+      }
+      var distEnd = distance(pt, end);
+      // if (distEnd < minDistEnd) {
+      if (!isInsideObstacle && distEnd < minDistEnd) {
+        minDistEnd = distEnd;
+        closestToEnd = { x: c, y: r };
+      }
+      currentX += cellWidth;
+      c++;
+    }
+    matrix.push(matrixRow);
+    pointMatrix.push(pointMatrixRow);
+    currentY -= cellHeight;
+    r++;
+  }
+
+  // find path on matrix grid
+
+  // javascript-astar ----------------------
+  var graph = new Graph(matrix, { diagonal: true });
+  var startOnMatrix = graph.grid[closestToStart.y][closestToStart.x];
+  var endOnMatrix = graph.grid[closestToEnd.y][closestToEnd.x];
+  var result = astar.search(graph, startOnMatrix, endOnMatrix);
+
+  var path = [startCoord];
+  result.forEach(function (coord) {
+    var coords = pointMatrix[coord.x][coord.y].split("|");
+    path.push([+coords[0], +coords[1]]); // make sure coords are numbers
+  });
+  path.push(endCoord);
+  // ---------------------------------------
+
+  // astar-andrea ------------------------
+  // var result = aStar(matrix, [closestToStart.x, closestToStart.y], [closestToEnd.x, closestToEnd.y], 'DiagonalFree');
+  // var path = [start.geometry.coordinates];
+  // result.forEach(function (coord) {
+  //     var coords = pointMatrix[coord[1]][coord[0]].split('|');
+  //     path.push([+coords[0], +coords[1]]); // make sure coords are numbers
+  // });
+  // path.push(end.geometry.coordinates);
+  // ---------------------------------------
+
+  return cleanCoords(lineString(path));
+}
+
+/**
+ * Checks if Point is inside any of the Polygons
+ *
+ * @private
+ * @param {Feature<Point>} pt to check
+ * @param {FeatureCollection<Polygon>} polygons features
+ * @returns {boolean} if inside or not
+ */
+function isInside(pt, polygons) {
+  for (var i = 0; i < polygons.features.length; i++) {
+    if (booleanPointInPolygon(pt, polygons.features[i])) {
+      return true;
+    }
+  }
+  return false;
+}
+
+export default shortestPath;

frontend/node_modules/@turf/shortest-path/dist/es/package.json

@@ -0,0 +1 @@
+{"type":"module"}

frontend/node_modules/@turf/shortest-path/dist/js/index.js

@@ -0,0 +1,601 @@
+'use strict';
+
+var bbox = require('@turf/bbox');
+var booleanPointInPolygon = require('@turf/boolean-point-in-polygon');
+var distance = require('@turf/distance');
+var scale = require('@turf/transform-scale');
+var cleanCoords = require('@turf/clean-coords');
+var bboxPolygon = require('@turf/bbox-polygon');
+var invariant = require('@turf/invariant');
+var helpers = require('@turf/helpers');
+
+function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
+
+var bbox__default = /*#__PURE__*/_interopDefaultLegacy(bbox);
+var booleanPointInPolygon__default = /*#__PURE__*/_interopDefaultLegacy(booleanPointInPolygon);
+var distance__default = /*#__PURE__*/_interopDefaultLegacy(distance);
+var scale__default = /*#__PURE__*/_interopDefaultLegacy(scale);
+var cleanCoords__default = /*#__PURE__*/_interopDefaultLegacy(cleanCoords);
+var bboxPolygon__default = /*#__PURE__*/_interopDefaultLegacy(bboxPolygon);
+
+// javascript-astar 0.4.1
+// http://github.com/bgrins/javascript-astar
+// Freely distributable under the MIT License.
+// Implements the astar search algorithm in javascript using a Binary Heap.
+// Includes Binary Heap (with modifications) from Marijn Haverbeke.
+// http://eloquentjavascript.net/appendix2.html
+
+function pathTo(node) {
+  var curr = node,
+    path = [];
+  while (curr.parent) {
+    path.unshift(curr);
+    curr = curr.parent;
+  }
+  return path;
+}
+
+function getHeap() {
+  return new BinaryHeap(function (node) {
+    return node.f;
+  });
+}
+
+/**
+ * Astar
+ * @private
+ */
+var astar = {
+  /**
+   * Perform an A* Search on a graph given a start and end node.
+   *
+   * @private
+   * @memberof astar
+   * @param {Graph} graph Graph
+   * @param {GridNode} start Start
+   * @param {GridNode} end End
+   * @param {Object} [options] Options
+   * @param {bool} [options.closest] Specifies whether to return the path to the closest node if the target is unreachable.
+   * @param {Function} [options.heuristic] Heuristic function (see astar.heuristics).
+   * @returns {Object} Search
+   */
+  search: function (graph, start, end, options) {
+    graph.cleanDirty();
+    options = options || {};
+    var heuristic = options.heuristic || astar.heuristics.manhattan,
+      closest = options.closest || false;
+
+    var openHeap = getHeap(),
+      closestNode = start; // set the start node to be the closest if required
+
+    start.h = heuristic(start, end);
+
+    openHeap.push(start);
+
+    while (openHeap.size() > 0) {
+      // Grab the lowest f(x) to process next.  Heap keeps this sorted for us.
+      var currentNode = openHeap.pop();
+
+      // End case -- result has been found, return the traced path.
+      if (currentNode === end) {
+        return pathTo(currentNode);
+      }
+
+      // Normal case -- move currentNode from open to closed, process each of its neighbors.
+      currentNode.closed = true;
+
+      // Find all neighbors for the current node.
+      var neighbors = graph.neighbors(currentNode);
+
+      for (var i = 0, il = neighbors.length; i < il; ++i) {
+        var neighbor = neighbors[i];
+
+        if (neighbor.closed || neighbor.isWall()) {
+          // Not a valid node to process, skip to next neighbor.
+          continue;
+        }
+
+        // The g score is the shortest distance from start to current node.
+        // We need to check if the path we have arrived at this neighbor is the shortest one we have seen yet.
+        var gScore = currentNode.g + neighbor.getCost(currentNode),
+          beenVisited = neighbor.visited;
+
+        if (!beenVisited || gScore < neighbor.g) {
+          // Found an optimal (so far) path to this node.  Take score for node to see how good it is.
+          neighbor.visited = true;
+          neighbor.parent = currentNode;
+          neighbor.h = neighbor.h || heuristic(neighbor, end);
+          neighbor.g = gScore;
+          neighbor.f = neighbor.g + neighbor.h;
+          graph.markDirty(neighbor);
+          if (closest) {
+            // If the neighbour is closer than the current closestNode or if it's equally close but has
+            // a cheaper path than the current closest node then it becomes the closest node
+            if (
+              neighbor.h < closestNode.h ||
+              (neighbor.h === closestNode.h && neighbor.g < closestNode.g)
+            ) {
+              closestNode = neighbor;
+            }
+          }
+
+          if (!beenVisited) {
+            // Pushing to heap will put it in proper place based on the 'f' value.
+            openHeap.push(neighbor);
+          } else {
+            // Already seen the node, but since it has been rescored we need to reorder it in the heap
+            openHeap.rescoreElement(neighbor);
+          }
+        }
+      }
+    }
+
+    if (closest) {
+      return pathTo(closestNode);
+    }
+
+    // No result was found - empty array signifies failure to find path.
+    return [];
+  },
+  // See list of heuristics: http://theory.stanford.edu/~amitp/GameProgramming/Heuristics.html
+  heuristics: {
+    manhattan: function (pos0, pos1) {
+      var d1 = Math.abs(pos1.x - pos0.x);
+      var d2 = Math.abs(pos1.y - pos0.y);
+      return d1 + d2;
+    },
+    diagonal: function (pos0, pos1) {
+      var D = 1;
+      var D2 = Math.sqrt(2);
+      var d1 = Math.abs(pos1.x - pos0.x);
+      var d2 = Math.abs(pos1.y - pos0.y);
+      return D * (d1 + d2) + (D2 - 2 * D) * Math.min(d1, d2);
+    },
+  },
+  cleanNode: function (node) {
+    node.f = 0;
+    node.g = 0;
+    node.h = 0;
+    node.visited = false;
+    node.closed = false;
+    node.parent = null;
+  },
+};
+
+/**
+ * A graph memory structure
+ *
+ * @private
+ * @param {Array} gridIn 2D array of input weights
+ * @param {Object} [options] Options
+ * @param {boolean} [options.diagonal] Specifies whether diagonal moves are allowed
+ * @returns {void} Graph
+ */
+function Graph(gridIn, options) {
+  options = options || {};
+  this.nodes = [];
+  this.diagonal = !!options.diagonal;
+  this.grid = [];
+  for (var x = 0; x < gridIn.length; x++) {
+    this.grid[x] = [];
+
+    for (var y = 0, row = gridIn[x]; y < row.length; y++) {
+      var node = new GridNode(x, y, row[y]);
+      this.grid[x][y] = node;
+      this.nodes.push(node);
+    }
+  }
+  this.init();
+}
+
+Graph.prototype.init = function () {
+  this.dirtyNodes = [];
+  for (var i = 0; i < this.nodes.length; i++) {
+    astar.cleanNode(this.nodes[i]);
+  }
+};
+
+Graph.prototype.cleanDirty = function () {
+  for (var i = 0; i < this.dirtyNodes.length; i++) {
+    astar.cleanNode(this.dirtyNodes[i]);
+  }
+  this.dirtyNodes = [];
+};
+
+Graph.prototype.markDirty = function (node) {
+  this.dirtyNodes.push(node);
+};
+
+Graph.prototype.neighbors = function (node) {
+  var ret = [],
+    x = node.x,
+    y = node.y,
+    grid = this.grid;
+
+  // West
+  if (grid[x - 1] && grid[x - 1][y]) {
+    ret.push(grid[x - 1][y]);
+  }
+
+  // East
+  if (grid[x + 1] && grid[x + 1][y]) {
+    ret.push(grid[x + 1][y]);
+  }
+
+  // South
+  if (grid[x] && grid[x][y - 1]) {
+    ret.push(grid[x][y - 1]);
+  }
+
+  // North
+  if (grid[x] && grid[x][y + 1]) {
+    ret.push(grid[x][y + 1]);
+  }
+
+  if (this.diagonal) {
+    // Southwest
+    if (grid[x - 1] && grid[x - 1][y - 1]) {
+      ret.push(grid[x - 1][y - 1]);
+    }
+
+    // Southeast
+    if (grid[x + 1] && grid[x + 1][y - 1]) {
+      ret.push(grid[x + 1][y - 1]);
+    }
+
+    // Northwest
+    if (grid[x - 1] && grid[x - 1][y + 1]) {
+      ret.push(grid[x - 1][y + 1]);
+    }
+
+    // Northeast
+    if (grid[x + 1] && grid[x + 1][y + 1]) {
+      ret.push(grid[x + 1][y + 1]);
+    }
+  }
+
+  return ret;
+};
+
+Graph.prototype.toString = function () {
+  var graphString = [],
+    nodes = this.grid, // when using grid
+    rowDebug,
+    row,
+    y,
+    l;
+  for (var x = 0, len = nodes.length; x < len; x++) {
+    rowDebug = [];
+    row = nodes[x];
+    for (y = 0, l = row.length; y < l; y++) {
+      rowDebug.push(row[y].weight);
+    }
+    graphString.push(rowDebug.join(" "));
+  }
+  return graphString.join("\n");
+};
+
+function GridNode(x, y, weight) {
+  this.x = x;
+  this.y = y;
+  this.weight = weight;
+}
+
+GridNode.prototype.toString = function () {
+  return "[" + this.x + " " + this.y + "]";
+};
+
+GridNode.prototype.getCost = function (fromNeighbor) {
+  // Take diagonal weight into consideration.
+  if (fromNeighbor && fromNeighbor.x !== this.x && fromNeighbor.y !== this.y) {
+    return this.weight * 1.41421;
+  }
+  return this.weight;
+};
+
+GridNode.prototype.isWall = function () {
+  return this.weight === 0;
+};
+
+function BinaryHeap(scoreFunction) {
+  this.content = [];
+  this.scoreFunction = scoreFunction;
+}
+
+BinaryHeap.prototype = {
+  push: function (element) {
+    // Add the new element to the end of the array.
+    this.content.push(element);
+
+    // Allow it to sink down.
+    this.sinkDown(this.content.length - 1);
+  },
+  pop: function () {
+    // Store the first element so we can return it later.
+    var result = this.content[0];
+    // Get the element at the end of the array.
+    var end = this.content.pop();
+    // If there are any elements left, put the end element at the
+    // start, and let it bubble up.
+    if (this.content.length > 0) {
+      this.content[0] = end;
+      this.bubbleUp(0);
+    }
+    return result;
+  },
+  remove: function (node) {
+    var i = this.content.indexOf(node);
+
+    // When it is found, the process seen in 'pop' is repeated
+    // to fill up the hole.
+    var end = this.content.pop();
+
+    if (i !== this.content.length - 1) {
+      this.content[i] = end;
+
+      if (this.scoreFunction(end) < this.scoreFunction(node)) {
+        this.sinkDown(i);
+      } else {
+        this.bubbleUp(i);
+      }
+    }
+  },
+  size: function () {
+    return this.content.length;
+  },
+  rescoreElement: function (node) {
+    this.sinkDown(this.content.indexOf(node));
+  },
+  sinkDown: function (n) {
+    // Fetch the element that has to be sunk.
+    var element = this.content[n];
+
+    // When at 0, an element can not sink any further.
+    while (n > 0) {
+      // Compute the parent element's index, and fetch it.
+      var parentN = ((n + 1) >> 1) - 1,
+        parent = this.content[parentN];
+      // Swap the elements if the parent is greater.
+      if (this.scoreFunction(element) < this.scoreFunction(parent)) {
+        this.content[parentN] = element;
+        this.content[n] = parent;
+        // Update 'n' to continue at the new position.
+        n = parentN;
+        // Found a parent that is less, no need to sink any further.
+      } else {
+        break;
+      }
+    }
+  },
+  bubbleUp: function (n) {
+    // Look up the target element and its score.
+    var length = this.content.length,
+      element = this.content[n],
+      elemScore = this.scoreFunction(element);
+
+    while (true) {
+      // Compute the indices of the child elements.
+      var child2N = (n + 1) << 1,
+        child1N = child2N - 1;
+      // This is used to store the new position of the element, if any.
+      var swap = null,
+        child1Score;
+      // If the first child exists (is inside the array)...
+      if (child1N < length) {
+        // Look it up and compute its score.
+        var child1 = this.content[child1N];
+        child1Score = this.scoreFunction(child1);
+
+        // If the score is less than our element's, we need to swap.
+        if (child1Score < elemScore) {
+          swap = child1N;
+        }
+      }
+
+      // Do the same checks for the other child.
+      if (child2N < length) {
+        var child2 = this.content[child2N],
+          child2Score = this.scoreFunction(child2);
+        if (child2Score < (swap === null ? elemScore : child1Score)) {
+          swap = child2N;
+        }
+      }
+
+      // If the element needs to be moved, swap it, and continue.
+      if (swap !== null) {
+        this.content[n] = this.content[swap];
+        this.content[swap] = element;
+        n = swap;
+        // Otherwise, we are done.
+      } else {
+        break;
+      }
+    }
+  },
+};
+
+/**
+ * Returns the shortest {@link LineString|path} from {@link Point|start} to {@link Point|end} without colliding with
+ * any {@link Feature} in {@link FeatureCollection<Polygon>| obstacles}
+ *
+ * @name shortestPath
+ * @param {Coord} start point
+ * @param {Coord} end point
+ * @param {Object} [options={}] optional parameters
+ * @param {Geometry|Feature|FeatureCollection<Polygon>} [options.obstacles] areas which path cannot travel
+ * @param {number} [options.minDistance] minimum distance between shortest path and obstacles
+ * @param {string} [options.units='kilometers'] unit in which resolution & minimum distance will be expressed in; it can be degrees, radians, miles, kilometers, ...
+ * @param {number} [options.resolution=100] distance between matrix points on which the path will be calculated
+ * @returns {Feature<LineString>} shortest path between start and end
+ * @example
+ * var start = [-5, -6];
+ * var end = [9, -6];
+ * var options = {
+ *   obstacles: turf.polygon([[[0, -7], [5, -7], [5, -3], [0, -3], [0, -7]]])
+ * };
+ *
+ * var path = turf.shortestPath(start, end, options);
+ *
+ * //addToMap
+ * var addToMap = [start, end, options.obstacles, path];
+ */
+function shortestPath(start, end, options) {
+  // Optional parameters
+  options = options || {};
+  if (!helpers.isObject(options)) throw new Error("options is invalid");
+  var resolution = options.resolution;
+  var minDistance = options.minDistance;
+  var obstacles = options.obstacles || helpers.featureCollection([]);
+
+  // validation
+  if (!start) throw new Error("start is required");
+  if (!end) throw new Error("end is required");
+  if ((resolution && !helpers.isNumber(resolution)) || resolution <= 0)
+    throw new Error("options.resolution must be a number, greater than 0");
+  if (minDistance)
+    throw new Error("options.minDistance is not yet implemented");
+
+  // Normalize Inputs
+  var startCoord = invariant.getCoord(start);
+  var endCoord = invariant.getCoord(end);
+  start = helpers.point(startCoord);
+  end = helpers.point(endCoord);
+
+  // Handle obstacles
+  switch (invariant.getType(obstacles)) {
+    case "FeatureCollection":
+      if (obstacles.features.length === 0)
+        return helpers.lineString([startCoord, endCoord]);
+      break;
+    case "Polygon":
+      obstacles = helpers.featureCollection([helpers.feature(invariant.getGeom(obstacles))]);
+      break;
+    default:
+      throw new Error("invalid obstacles");
+  }
+
+  // define path grid area
+  var collection = obstacles;
+  collection.features.push(start);
+  collection.features.push(end);
+  var box = bbox__default['default'](scale__default['default'](bboxPolygon__default['default'](bbox__default['default'](collection)), 1.15)); // extend 15%
+  if (!resolution) {
+    var width = distance__default['default']([box[0], box[1]], [box[2], box[1]], options);
+    resolution = width / 100;
+  }
+  collection.features.pop();
+  collection.features.pop();
+
+  var west = box[0];
+  var south = box[1];
+  var east = box[2];
+  var north = box[3];
+
+  var xFraction = resolution / distance__default['default']([west, south], [east, south], options);
+  var cellWidth = xFraction * (east - west);
+  var yFraction = resolution / distance__default['default']([west, south], [west, north], options);
+  var cellHeight = yFraction * (north - south);
+
+  var bboxHorizontalSide = east - west;
+  var bboxVerticalSide = north - south;
+  var columns = Math.floor(bboxHorizontalSide / cellWidth);
+  var rows = Math.floor(bboxVerticalSide / cellHeight);
+  // adjust origin of the grid
+  var deltaX = (bboxHorizontalSide - columns * cellWidth) / 2;
+  var deltaY = (bboxVerticalSide - rows * cellHeight) / 2;
+
+  // loop through points only once to speed up process
+  // define matrix grid for A-star algorithm
+  var pointMatrix = [];
+  var matrix = [];
+
+  var closestToStart = [];
+  var closestToEnd = [];
+  var minDistStart = Infinity;
+  var minDistEnd = Infinity;
+  var currentY = north - deltaY;
+  var r = 0;
+  while (currentY >= south) {
+    // var currentY = south + deltaY;
+    var matrixRow = [];
+    var pointMatrixRow = [];
+    var currentX = west + deltaX;
+    var c = 0;
+    while (currentX <= east) {
+      var pt = helpers.point([currentX, currentY]);
+      var isInsideObstacle = isInside(pt, obstacles);
+      // feed obstacles matrix
+      matrixRow.push(isInsideObstacle ? 0 : 1); // with javascript-astar
+      // matrixRow.push(isInsideObstacle ? 1 : 0); // with astar-andrea
+      // map point's coords
+      pointMatrixRow.push(currentX + "|" + currentY);
+      // set closest points
+      var distStart = distance__default['default'](pt, start);
+      // if (distStart < minDistStart) {
+      if (!isInsideObstacle && distStart < minDistStart) {
+        minDistStart = distStart;
+        closestToStart = { x: c, y: r };
+      }
+      var distEnd = distance__default['default'](pt, end);
+      // if (distEnd < minDistEnd) {
+      if (!isInsideObstacle && distEnd < minDistEnd) {
+        minDistEnd = distEnd;
+        closestToEnd = { x: c, y: r };
+      }
+      currentX += cellWidth;
+      c++;
+    }
+    matrix.push(matrixRow);
+    pointMatrix.push(pointMatrixRow);
+    currentY -= cellHeight;
+    r++;
+  }
+
+  // find path on matrix grid
+
+  // javascript-astar ----------------------
+  var graph = new Graph(matrix, { diagonal: true });
+  var startOnMatrix = graph.grid[closestToStart.y][closestToStart.x];
+  var endOnMatrix = graph.grid[closestToEnd.y][closestToEnd.x];
+  var result = astar.search(graph, startOnMatrix, endOnMatrix);
+
+  var path = [startCoord];
+  result.forEach(function (coord) {
+    var coords = pointMatrix[coord.x][coord.y].split("|");
+    path.push([+coords[0], +coords[1]]); // make sure coords are numbers
+  });
+  path.push(endCoord);
+  // ---------------------------------------
+
+  // astar-andrea ------------------------
+  // var result = aStar(matrix, [closestToStart.x, closestToStart.y], [closestToEnd.x, closestToEnd.y], 'DiagonalFree');
+  // var path = [start.geometry.coordinates];
+  // result.forEach(function (coord) {
+  //     var coords = pointMatrix[coord[1]][coord[0]].split('|');
+  //     path.push([+coords[0], +coords[1]]); // make sure coords are numbers
+  // });
+  // path.push(end.geometry.coordinates);
+  // ---------------------------------------
+
+  return cleanCoords__default['default'](helpers.lineString(path));
+}
+
+/**
+ * Checks if Point is inside any of the Polygons
+ *
+ * @private
+ * @param {Feature<Point>} pt to check
+ * @param {FeatureCollection<Polygon>} polygons features
+ * @returns {boolean} if inside or not
+ */
+function isInside(pt, polygons) {
+  for (var i = 0; i < polygons.features.length; i++) {
+    if (booleanPointInPolygon__default['default'](pt, polygons.features[i])) {
+      return true;
+    }
+  }
+  return false;
+}
+
+module.exports = shortestPath;
+module.exports.default = shortestPath;

frontend/node_modules/@turf/shortest-path/index.d.ts

@@ -0,0 +1,22 @@
+import {
+  Polygon,
+  Feature,
+  FeatureCollection,
+  Coord,
+  LineString,
+  Units,
+} from "@turf/helpers";
+
+/**
+ * http://turfjs.org/docs/#shortestpath
+ */
+export default function shortestPath(
+  start: Coord,
+  end: Coord,
+  options?: {
+    obstacles?: Polygon | Feature<Polygon> | FeatureCollection<Polygon>;
+    minDistance?: number;
+    units?: Units;
+    resolution?: number;
+  }
+): Feature<LineString>;

frontend/node_modules/@turf/shortest-path/package.json

@@ -0,0 +1,72 @@
+{
+  "name": "@turf/shortest-path",
+  "version": "6.5.0",
+  "description": "turf shortest-path module",
+  "author": "Turf Authors",
+  "contributors": [
+    "Stefano Borghi <@stebogit>",
+    "Denis Carriere <@DenisCarriere>"
+  ],
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/Turfjs/turf/issues"
+  },
+  "homepage": "https://github.com/Turfjs/turf",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/Turfjs/turf.git"
+  },
+  "funding": "https://opencollective.com/turf",
+  "publishConfig": {
+    "access": "public"
+  },
+  "keywords": [
+    "turf",
+    "shortest-path",
+    "path"
+  ],
+  "main": "dist/js/index.js",
+  "module": "dist/es/index.js",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": "./dist/es/index.js",
+      "require": "./dist/js/index.js"
+    }
+  },
+  "types": "index.d.ts",
+  "sideEffects": false,
+  "files": [
+    "dist",
+    "index.d.ts"
+  ],
+  "scripts": {
+    "bench": "node -r esm bench.js",
+    "build": "rollup -c ../../rollup.config.js && echo '{\"type\":\"module\"}' > dist/es/package.json",
+    "docs": "node ../../scripts/generate-readmes",
+    "test": "npm-run-all test:*",
+    "test:tape": "node -r esm test.js",
+    "test:types": "tsc --esModuleInterop --noEmit types.ts"
+  },
+  "devDependencies": {
+    "@turf/truncate": "^6.5.0",
+    "benchmark": "*",
+    "load-json-file": "*",
+    "npm-run-all": "*",
+    "rollup": "*",
+    "tape": "*",
+    "write-json-file": "*"
+  },
+  "dependencies": {
+    "@turf/bbox": "^6.5.0",
+    "@turf/bbox-polygon": "^6.5.0",
+    "@turf/boolean-point-in-polygon": "^6.5.0",
+    "@turf/clean-coords": "^6.5.0",
+    "@turf/distance": "^6.5.0",
+    "@turf/helpers": "^6.5.0",
+    "@turf/invariant": "^6.5.0",
+    "@turf/meta": "^6.5.0",
+    "@turf/transform-scale": "^6.5.0"
+  },
+  "gitHead": "5375941072b90d489389db22b43bfe809d5e451e"
+}