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frontend/node_modules/d3-polygon/README.md

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+# d3-polygon
+
+This module provides a few basic geometric operations for two-dimensional polygons. Each polygon is represented as an array of two-element arrays [​[<i>x1</i>, <i>y1</i>], [<i>x2</i>, <i>y2</i>], …], and may either be closed (wherein the first and last point are the same) or open (wherein they are not). Typically polygons are in counterclockwise order, assuming a coordinate system where the origin ⟨0,0⟩ is in the top-left corner.
+
+## Installing
+
+If you use npm, `npm install d3-polygon`. You can also download the [latest release on GitHub](https://github.com/d3/d3-polygon/releases/latest). For vanilla HTML in modern browsers, import d3-polygon from Skypack:
+
+```html
+<script type="module">
+
+import {polygonHull} from "https://cdn.skypack.dev/d3-polygon@3";
+
+const hull = polygonHull(points);
+
+</script>
+```
+
+For legacy environments, you can load d3-polygon’s UMD bundle from an npm-based CDN such as jsDelivr; a `d3` global is exported:
+
+```html
+<script src="https://cdn.jsdelivr.net/npm/d3-polygon@3"></script>
+<script>
+
+const hull = d3.polygonHull(points);
+
+</script>
+```
+
+## API Reference
+
+<a href="#polygonArea" name="polygonArea">#</a> d3.<b>polygonArea</b>(<i>polygon</i>) [<>](https://github.com/d3/d3-polygon/blob/master/src/area.js "Source Code")
+
+Returns the signed area of the specified *polygon*. If the vertices of the polygon are in counterclockwise order (assuming a coordinate system where the origin ⟨0,0⟩ is in the top-left corner), the returned area is positive; otherwise it is negative, or zero.
+
+<a href="#polygonCentroid" name="polygonCentroid">#</a> d3.<b>polygonCentroid</b>(<i>polygon</i>) [<>](https://github.com/d3/d3-polygon/blob/master/src/centroid.js "Source Code")
+
+Returns the [centroid](https://en.wikipedia.org/wiki/Centroid) of the specified *polygon*.
+
+<a href="#polygonHull" name="polygonHull">#</a> d3.<b>polygonHull</b>(<i>points</i>) [<>](https://github.com/d3/d3-polygon/blob/master/src/hull.js#L23 "Source Code")
+
+<a href="http://bl.ocks.org/mbostock/6f14f7b7f267a85f7cdc"><img src="https://raw.githubusercontent.com/d3/d3-polygon/master/img/hull.png" width="250" height="250"></a>
+
+Returns the [convex hull](https://en.wikipedia.org/wiki/Convex_hull) of the specified *points* using [Andrew’s monotone chain algorithm](http://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain). The returned hull is represented as an array containing a subset of the input *points* arranged in counterclockwise order. Returns null if *points* has fewer than three elements.
+
+<a href="#polygonContains" name="polygonContains">#</a> d3.<b>polygonContains</b>(<i>polygon</i>, <i>point</i>) [<>](https://github.com/d3/d3-polygon/blob/master/src/contains.js "Source Code")
+
+Returns true if and only if the specified *point* is inside the specified *polygon*.
+
+<a href="#polygonLength" name="polygonLength">#</a> d3.<b>polygonLength</b>(<i>polygon</i>) [<>](https://github.com/d3/d3-polygon/blob/master/src/length.js "Source Code")
+
+Returns the length of the perimeter of the specified *polygon*.

frontend/node_modules/d3-polygon/dist/d3-polygon.min.js

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+// https://d3js.org/d3-polygon/ v3.0.1 Copyright 2010-2021 Mike Bostock
+!function(n,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((n="undefined"!=typeof globalThis?globalThis:n||self).d3=n.d3||{})}(this,(function(n){"use strict";function e(n,e){return n[0]-e[0]||n[1]-e[1]}function t(n){const e=n.length,t=[0,1];let o,r=2;for(o=2;o<e;++o){for(;r>1&&(f=n[t[r-2]],l=n[t[r-1]],u=n[o],(l[0]-f[0])*(u[1]-f[1])-(l[1]-f[1])*(u[0]-f[0])<=0);)--r;t[r++]=o}var f,l,u;return t.slice(0,r)}n.polygonArea=function(n){for(var e,t=-1,o=n.length,r=n[o-1],f=0;++t<o;)e=r,r=n[t],f+=e[1]*r[0]-e[0]*r[1];return f/2},n.polygonCentroid=function(n){for(var e,t,o=-1,r=n.length,f=0,l=0,u=n[r-1],i=0;++o<r;)e=u,u=n[o],i+=t=e[0]*u[1]-u[0]*e[1],f+=(e[0]+u[0])*t,l+=(e[1]+u[1])*t;return[f/(i*=3),l/i]},n.polygonContains=function(n,e){for(var t,o,r=n.length,f=n[r-1],l=e[0],u=e[1],i=f[0],g=f[1],h=!1,a=0;a<r;++a)t=(f=n[a])[0],(o=f[1])>u!=g>u&&l<(i-t)*(u-o)/(g-o)+t&&(h=!h),i=t,g=o;return h},n.polygonHull=function(n){if((r=n.length)<3)return null;var o,r,f=new Array(r),l=new Array(r);for(o=0;o<r;++o)f[o]=[+n[o][0],+n[o][1],o];for(f.sort(e),o=0;o<r;++o)l[o]=[f[o][0],-f[o][1]];var u=t(f),i=t(l),g=i[0]===u[0],h=i[i.length-1]===u[u.length-1],a=[];for(o=u.length-1;o>=0;--o)a.push(n[f[u[o]][2]]);for(o=+g;o<i.length-h;++o)a.push(n[f[i[o]][2]]);return a},n.polygonLength=function(n){for(var e,t,o=-1,r=n.length,f=n[r-1],l=f[0],u=f[1],i=0;++o<r;)e=l,t=u,e-=l=(f=n[o])[0],t-=u=f[1],i+=Math.hypot(e,t);return i},Object.defineProperty(n,"__esModule",{value:!0})}));

frontend/node_modules/d3-polygon/src/length.js

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+export default function(polygon) {
+  var i = -1,
+      n = polygon.length,
+      b = polygon[n - 1],
+      xa,
+      ya,
+      xb = b[0],
+      yb = b[1],
+      perimeter = 0;
+
+  while (++i < n) {
+    xa = xb;
+    ya = yb;
+    b = polygon[i];
+    xb = b[0];
+    yb = b[1];
+    xa -= xb;
+    ya -= yb;
+    perimeter += Math.hypot(xa, ya);
+  }
+
+  return perimeter;
+}