!function(t,i){"object"==typeof exports&&"undefined"!=typeof module?module.exports=i():"function"==typeof define&&define.amd?define(i):t.Delaunator=i()}(this,function(){"use strict";var t=Math.pow(2,-52),i=function(i){var n=i.length>>1;if(n>0&&"number"!=typeof i[0])throw new Error("Expected coords to contain numbers.");this.coords=i;var s=2*n-5,l=this.triangles=new Uint32Array(3*s),o=this.halfedges=new Int32Array(3*s);this._hashSize=Math.ceil(Math.sqrt(n));for(var f=this.hullPrev=new Uint32Array(n),u=this.hullNext=new Uint32Array(n),v=this.hullTri=new Uint32Array(n),d=new Int32Array(this._hashSize).fill(-1),_=new Uint32Array(n),y=1/0,g=1/0,c=-1/0,w=-1/0,p=0;p<n;p++){var b=i[2*p],x=i[2*p+1];b<y&&(y=b),x<g&&(g=x),b>c&&(c=b),x>w&&(w=x),_[p]=p}for(var z,S,k,A=(y+c)/2,T=(g+w)/2,M=1/0,K=0;K<n;K++){var m=r(A,T,i[2*K],i[2*K+1]);m<M&&(z=K,M=m)}var U=i[2*z],L=i[2*z+1];M=1/0;for(var N=0;N<n;N++)if(N!==z){var E=r(U,L,i[2*N],i[2*N+1]);E<M&&E>0&&(S=N,M=E)}for(var D=i[2*S],F=i[2*S+1],I=1/0,P=0;P<n;P++)if(P!==z&&P!==S){var j=h(U,L,D,F,i[2*P],i[2*P+1]);j<I&&(k=P,I=j)}var q=i[2*k],B=i[2*k+1];if(I===1/0)throw new Error("No Delaunay triangulation exists for this input.");if(a(U,L,D,F,q,B)){var C=S,G=D,H=F;S=k,D=q,F=B,k=C,q=G,B=H}var J=function(t,i,r,a,h,e){var n=r-t,s=a-i,l=h-t,o=e-i,f=n*n+s*s,u=l*l+o*o,v=.5/(n*o-s*l);return{x:t+(o*f-s*u)*v,y:i+(n*u-l*f)*v}}(U,L,D,F,q,B);this._cx=J.x,this._cy=J.y;for(var O=new Float64Array(n),Q=0;Q<n;Q++)O[Q]=r(i[2*Q],i[2*Q+1],J.x,J.y);!function t(i,r,a,h){if(h-a<=20)for(var n=a+1;n<=h;n++){for(var s=i[n],l=r[s],o=n-1;o>=a&&r[i[o]]>l;)i[o+1]=i[o--];i[o+1]=s}else{var f=a+h>>1,u=a+1,v=h;e(i,f,u),r[i[a]]>r[i[h]]&&e(i,a,h),r[i[u]]>r[i[h]]&&e(i,u,h),r[i[a]]>r[i[u]]&&e(i,a,u);for(var d=i[u],_=r[d];;){do{u++}while(r[i[u]]<_);do{v--}while(r[i[v]]>_);if(v<u)break;e(i,u,v)}i[a+1]=i[v],i[v]=d,h-u+1>=v-a?(t(i,r,u,h),t(i,r,a,v-1)):(t(i,r,a,v-1),t(i,r,u,h))}}(_,O,0,n-1),this.hullStart=z;var R=3;u[z]=f[k]=S,u[S]=f[z]=k,u[k]=f[S]=z,v[z]=0,v[S]=1,v[k]=2,d[this._hashKey(U,L)]=z,d[this._hashKey(D,F)]=S,d[this._hashKey(q,B)]=k,this.trianglesLen=0,this._addTriangle(z,S,k,-1,-1,-1);for(var V=0,W=void 0,X=void 0;V<_.length;V++){var Y=_[V],Z=i[2*Y],$=i[2*Y+1];if(!(V>0&&Math.abs(Z-W)<=t&&Math.abs($-X)<=t)&&(W=Z,X=$,Y!==z&&Y!==S&&Y!==k)){for(var tt=0,it=0,rt=this._hashKey(Z,$);it<this._hashSize&&(-1===(tt=d[(rt+it)%this._hashSize])||tt===u[tt]);it++);for(var at=tt=f[tt],ht=void 0;ht=u[at],!a(Z,$,i[2*at],i[2*at+1],i[2*ht],i[2*ht+1]);)if((at=ht)===tt){at=-1;break}if(-1!==at){var et=this._addTriangle(at,Y,u[at],-1,-1,v[at]);v[Y]=this._legalize(et+2),v[at]=et,R++;for(var nt=u[at];ht=u[nt],a(Z,$,i[2*nt],i[2*nt+1],i[2*ht],i[2*ht+1]);)et=this._addTriangle(nt,Y,ht,v[Y],-1,v[nt]),v[Y]=this._legalize(et+2),u[nt]=nt,R--,nt=ht;if(at===tt)for(;a(Z,$,i[2*(ht=f[at])],i[2*ht+1],i[2*at],i[2*at+1]);)et=this._addTriangle(ht,Y,at,-1,v[at],v[ht]),this._legalize(et+2),v[ht]=et,u[at]=at,R--,at=ht;this.hullStart=f[Y]=at,u[at]=f[nt]=Y,u[Y]=nt,d[this._hashKey(Z,$)]=Y,d[this._hashKey(i[2*at],i[2*at+1])]=at}}}this.hull=new Uint32Array(R);for(var st=0,lt=this.hullStart;st<R;st++)this.hull[st]=lt,lt=u[lt];this.hullPrev=this.hullNext=this.hullTri=null,this.triangles=l.subarray(0,this.trianglesLen),this.halfedges=o.subarray(0,this.trianglesLen)};function r(t,i,r,a){var h=t-r,e=i-a;return h*h+e*e}function a(t,i,r,a,h,e){return(a-i)*(h-r)-(r-t)*(e-a)<0}function h(t,i,r,a,h,e){var n=r-t,s=a-i,l=h-t,o=e-i,f=n*n+s*s,u=l*l+o*o,v=.5/(n*o-s*l),d=(o*f-s*u)*v,_=(n*u-l*f)*v;return d*d+_*_}function e(t,i,r){var a=t[i];t[i]=t[r],t[r]=a}function n(t){return t[0]}function s(t){return t[1]}return i.from=function(t,r,a){void 0===r&&(r=n),void 0===a&&(a=s);for(var h=t.length,e=new Float64Array(2*h),l=0;l<h;l++){var o=t[l];e[2*l]=r(o),e[2*l+1]=a(o)}return new i(e)},i.prototype._hashKey=function(t,i){return Math.floor((r=t-this._cx,a=i-this._cy,h=r/(Math.abs(r)+Math.abs(a)),(a>0?3-h:1+h)/4*this._hashSize))%this._hashSize;var r,a,h},i.prototype._legalize=function(t){var i=this.triangles,r=this.coords,a=this.halfedges,h=a[t],e=t-t%3,n=h-h%3,s=e+(t+1)%3,l=e+(t+2)%3,o=n+(h+2)%3;if(-1===h)return l;var f,u,v,d,_,y,g,c,w,p,b,x,z,S,k,A,T=i[l],M=i[t],K=i[s],m=i[o];if(f=r[2*T],u=r[2*T+1],v=r[2*M],d=r[2*M+1],_=r[2*K],y=r[2*K+1],g=r[2*m],c=r[2*m+1],(w=f-g)*((x=d-c)*(A=(z=_-g)*z+(S=y-c)*S)-(k=(b=v-g)*b+x*x)*S)-(p=u-c)*(b*A-k*z)+(w*w+p*p)*(b*S-x*z)<0){i[t]=m,i[h]=T;var U=a[o];if(-1===U){var L=this.hullStart;do{if(this.hullTri[L]===o){this.hullTri[L]=t;break}L=this.hullNext[L]}while(L!==this.hullStart)}this._link(t,U),this._link(h,a[l]),this._link(l,o);var N=n+(h+1)%3;return this._legalize(t),this._legalize(N)}return l},i.prototype._link=function(t,i){this.halfedges[t]=i,-1!==i&&(this.halfedges[i]=t)},i.prototype._addTriangle=function(t,i,r,a,h,e){var n=this.trianglesLen;return this.triangles[n]=t,this.triangles[n+1]=i,this.triangles[n+2]=r,this._link(n,a),this._link(n+1,h),this._link(n+2,e),this.trianglesLen+=3,n},i});