text: // https://d3js.org/d3-polygon/ Version 1.0.3. Copyright 2017 Mike Bostock.
  !function(n,r){"object"==typeof exports&&"undefined"!=typeof module?r(exports):"function"==typeof define&&define.amd?define(["exports"],r):r(n.d3=n.d3||{})}(this,function(n){"use strict";function r(n,r){return n[0]-r[0]||n[1]-r[1]}function e(n){for(var r=n.length,e=[0,1],t=2,o=2;o<r;++o){for(;t>1&&f(n[e[t-2]],n[e[t-1]],n[o])<=0;)--t;e[t++]=o}return e.slice(0,t)}var t=function(n){for(var r,e=-1,t=n.length,o=n[t-1],f=0;++e<t;)r=o,o=n[e],f+=r[1]*o[0]-r[0]*o[1];return f/2},o=function(n){for(var r,e,t=-1,o=n.length,f=0,u=0,l=n[o-1],i=0;++t<o;)r=l,l=n[t],i+=e=r[0]*l[1]-l[0]*r[1],f+=(r[0]+l[0])*e,u+=(r[1]+l[1])*e;return i*=3,[f/i,u/i]},f=function(n,r,e){return(r[0]-n[0])*(e[1]-n[1])-(r[1]-n[1])*(e[0]-n[0])},u=function(n){if((o=n.length)<3)return null;var t,o,f=new Array(o),u=new Array(o);for(t=0;t<o;++t)f[t]=[+n[t][0],+n[t][1],t];for(f.sort(r),t=0;t<o;++t)u[t]=[f[t][0],-f[t][1]];var l=e(f),i=e(u),g=i[0]===l[0],a=i[i.length-1]===l[l.length-1],c=[];for(t=l.length-1;t>=0;--t)c.push(n[f[l[t]][2]]);for(t=+g;t<i.length-a;++t)c.push(n[f[i[t]][2]]);return c},l=function(n,r){for(var e,t,o=n.length,f=n[o-1],u=r[0],l=r[1],i=f[0],g=f[1],a=!1,c=0;c<o;++c)f=n[c],e=f[0],t=f[1],t>l!=g>l&&u<(i-e)*(l-t)/(g-t)+e&&(a=!a),i=e,g=t;return a},i=function(n){for(var r,e,t=-1,o=n.length,f=n[o-1],u=f[0],l=f[1],i=0;++t<o;)r=u,e=l,f=n[t],u=f[0],l=f[1],r-=u,e-=l,i+=Math.sqrt(r*r+e*e);return i};n.polygonArea=t,n.polygonCentroid=o,n.polygonHull=u,n.polygonContains=l,n.polygonLength=i,Object.defineProperty(n,"__esModule",{value:!0})});