const t=Math.PI,h=2*t,i=1e-6,s=h-i;function append(t){this._+=t[0];for(let h=1,i=t.length;h<i;++h)this._+=arguments[h]+t[h]}function appendRound(t){let h=Math.floor(t);if(!(h>=0))throw new Error(`invalid digits: ${t}`);if(h>15)return append;const i=10**h;return function(t){this._+=t[0];for(let h=1,s=t.length;h<s;++h)this._+=Math.round(arguments[h]*i)/i+t[h]}}class Path{constructor(t){this._x0=this._y0=this._x1=this._y1=null;this._="";this._append=null==t?append:appendRound(t)}moveTo(t,h){this._append`M${this._x0=this._x1=+t},${this._y0=this._y1=+h}`}closePath(){if(null!==this._x1){this._x1=this._x0,this._y1=this._y0;this._append`Z`}}lineTo(t,h){this._append`L${this._x1=+t},${this._y1=+h}`}quadraticCurveTo(t,h,i,s){this._append`Q${+t},${+h},${this._x1=+i},${this._y1=+s}`}bezierCurveTo(t,h,i,s,n,a){this._append`C${+t},${+h},${+i},${+s},${this._x1=+n},${this._y1=+a}`}arcTo(h,s,n,a,e){h=+h,s=+s,n=+n,a=+a,e=+e;if(e<0)throw new Error(`negative radius: ${e}`);let _=this._x1,$=this._y1,p=n-h,r=a-s,o=_-h,d=$-s,l=o*o+d*d;if(null===this._x1)this._append`M${this._x1=h},${this._y1=s}`;else if(l>i)if(Math.abs(d*p-r*o)>i&&e){let u=n-_,x=a-$,y=p*p+r*r,M=u*u+x*x,c=Math.sqrt(y),f=Math.sqrt(l),w=e*Math.tan((t-Math.acos((y+l-M)/(2*c*f)))/2),v=w/f,P=w/c;Math.abs(v-1)>i&&this._append`L${h+v*o},${s+v*d}`;this._append`A${e},${e},0,0,${+(d*u>o*x)},${this._x1=h+P*p},${this._y1=s+P*r}`}else this._append`L${this._x1=h},${this._y1=s}`;else;}arc(n,a,e,_,$,p){n=+n,a=+a,e=+e,p=!!p;if(e<0)throw new Error(`negative radius: ${e}`);let r=e*Math.cos(_),o=e*Math.sin(_),d=n+r,l=a+o,u=1^p,x=p?_-$:$-_;null===this._x1?this._append`M${d},${l}`:(Math.abs(this._x1-d)>i||Math.abs(this._y1-l)>i)&&this._append`L${d},${l}`;if(e){x<0&&(x=x%h+h);x>s?this._append`A${e},${e},0,1,${u},${n-r},${a-o}A${e},${e},0,1,${u},${this._x1=d},${this._y1=l}`:x>i&&this._append`A${e},${e},0,${+(x>=t)},${u},${this._x1=n+e*Math.cos($)},${this._y1=a+e*Math.sin($)}`}}rect(t,h,i,s){this._append`M${this._x0=this._x1=+t},${this._y0=this._y1=+h}h${i=+i}v${+s}h${-i}Z`}toString(){return this._}}function path(){return new Path}path.prototype=Path.prototype;function pathRound(t=3){return new Path(+t)}export{Path,path,pathRound};