polybool.min.js

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){/*
 * @copyright 2016 Sean Connelly (@voidqk), http://syntheti.cc
 * @license MIT
 * @preserve Project Home: https://github.com/voidqk/polybooljs
 */
var BuildLog=require("./lib/build-log");var Epsilon=require("./lib/epsilon");var Intersecter=require("./lib/intersecter");var SegmentChainer=require("./lib/segment-chainer");var SegmentSelector=require("./lib/segment-selector");var GeoJSON=require("./lib/geojson");var buildLog=false;var epsilon=Epsilon();var PolyBool;PolyBool={buildLog:function(bl){if(bl===true)buildLog=BuildLog();else if(bl===false)buildLog=false;return buildLog===false?false:buildLog.list},epsilon:function(v){return epsilon.epsilon(v)},segments:function(poly){var i=Intersecter(true,epsilon,buildLog);poly.regions.forEach(i.addRegion);return{segments:i.calculate(poly.inverted),inverted:poly.inverted}},combine:function(segments1,segments2){var i3=Intersecter(false,epsilon,buildLog);return{combined:i3.calculate(segments1.segments,segments1.inverted,segments2.segments,segments2.inverted),inverted1:segments1.inverted,inverted2:segments2.inverted}},selectUnion:function(combined){return{segments:SegmentSelector.union(combined.combined,buildLog),inverted:combined.inverted1||combined.inverted2}},selectIntersect:function(combined){return{segments:SegmentSelector.intersect(combined.combined,buildLog),inverted:combined.inverted1&&combined.inverted2}},selectDifference:function(combined){return{segments:SegmentSelector.difference(combined.combined,buildLog),inverted:combined.inverted1&&!combined.inverted2}},selectDifferenceRev:function(combined){return{segments:SegmentSelector.differenceRev(combined.combined,buildLog),inverted:!combined.inverted1&&combined.inverted2}},selectXor:function(combined){return{segments:SegmentSelector.xor(combined.combined,buildLog),inverted:combined.inverted1!==combined.inverted2}},polygon:function(segments){return{regions:SegmentChainer(segments.segments,epsilon,buildLog),inverted:segments.inverted}},polygonFromGeoJSON:function(geojson){return GeoJSON.toPolygon(PolyBool,geojson)},polygonToGeoJSON:function(poly){return GeoJSON.fromPolygon(PolyBool,epsilon,poly)},union:function(poly1,poly2){return operate(poly1,poly2,PolyBool.selectUnion)},intersect:function(poly1,poly2){return operate(poly1,poly2,PolyBool.selectIntersect)},difference:function(poly1,poly2){return operate(poly1,poly2,PolyBool.selectDifference)},differenceRev:function(poly1,poly2){return operate(poly1,poly2,PolyBool.selectDifferenceRev)},xor:function(poly1,poly2){return operate(poly1,poly2,PolyBool.selectXor)}};function operate(poly1,poly2,selector){var seg1=PolyBool.segments(poly1);var seg2=PolyBool.segments(poly2);var comb=PolyBool.combine(seg1,seg2);var seg3=selector(comb);return PolyBool.polygon(seg3)}if(typeof window==="object")window.PolyBool=PolyBool;module.exports=PolyBool},{"./lib/build-log":2,"./lib/epsilon":3,"./lib/geojson":4,"./lib/intersecter":5,"./lib/segment-chainer":7,"./lib/segment-selector":8}],2:[function(require,module,exports){function BuildLog(){var my;var nextSegmentId=0;var curVert=false;function push(type,data){my.list.push({type:type,data:data?JSON.parse(JSON.stringify(data)):void 0});return my}my={list:[],segmentId:function(){return nextSegmentId++},checkIntersection:function(seg1,seg2){return push("check",{seg1:seg1,seg2:seg2})},segmentChop:function(seg,end){push("div_seg",{seg:seg,pt:end});return push("chop",{seg:seg,pt:end})},statusRemove:function(seg){return push("pop_seg",{seg:seg})},segmentUpdate:function(seg){return push("seg_update",{seg:seg})},segmentNew:function(seg,primary){return push("new_seg",{seg:seg,primary:primary})},segmentRemove:function(seg){return push("rem_seg",{seg:seg})},tempStatus:function(seg,above,below){return push("temp_status",{seg:seg,above:above,below:below})},rewind:function(seg){return push("rewind",{seg:seg})},status:function(seg,above,below){return push("status",{seg:seg,above:above,below:below})},vert:function(x){if(x===curVert)return my;curVert=x;return push("vert",{x:x})},log:function(data){if(typeof data!=="string")data=JSON.stringify(data,false,"  ");return push("log",{txt:data})},reset:function(){return push("reset")},selected:function(segs){return push("selected",{segs:segs})},chainStart:function(seg){return push("chain_start",{seg:seg})},chainRemoveHead:function(index,pt){return push("chain_rem_head",{index:index,pt:pt})},chainRemoveTail:function(index,pt){return push("chain_rem_tail",{index:index,pt:pt})},chainNew:function(pt1,pt2){return push("chain_new",{pt1:pt1,pt2:pt2})},chainMatch:function(index){return push("chain_match",{index:index})},chainClose:function(index){return push("chain_close",{index:index})},chainAddHead:function(index,pt){return push("chain_add_head",{index:index,pt:pt})},chainAddTail:function(index,pt){return push("chain_add_tail",{index:index,pt:pt})},chainConnect:function(index1,index2){return push("chain_con",{index1:index1,index2:index2})},chainReverse:function(index){return push("chain_rev",{index:index})},chainJoin:function(index1,index2){return push("chain_join",{index1:index1,index2:index2})},done:function(){return push("done")}};return my}module.exports=BuildLog},{}],3:[function(require,module,exports){function Epsilon(eps){if(typeof eps!=="number")eps=1e-10;var my={epsilon:function(v){if(typeof v==="number")eps=v;return eps},pointAboveOrOnLine:function(pt,left,right){var Ax=left[0];var Ay=left[1];var Bx=right[0];var By=right[1];var Cx=pt[0];var Cy=pt[1];return(Bx-Ax)*(Cy-Ay)-(By-Ay)*(Cx-Ax)>=-eps},pointBetween:function(p,left,right){var d_py_ly=p[1]-left[1];var d_rx_lx=right[0]-left[0];var d_px_lx=p[0]-left[0];var d_ry_ly=right[1]-left[1];var dot=d_px_lx*d_rx_lx+d_py_ly*d_ry_ly;if(dot<eps)return false;var sqlen=d_rx_lx*d_rx_lx+d_ry_ly*d_ry_ly;if(dot-sqlen>-eps)return false;return true},pointsSameX:function(p1,p2){return Math.abs(p1[0]-p2[0])<eps},pointsSameY:function(p1,p2){return Math.abs(p1[1]-p2[1])<eps},pointsSame:function(p1,p2){return my.pointsSameX(p1,p2)&&my.pointsSameY(p1,p2)},pointsCompare:function(p1,p2){if(my.pointsSameX(p1,p2))return my.pointsSameY(p1,p2)?0:p1[1]<p2[1]?-1:1;return p1[0]<p2[0]?-1:1},pointsCollinear:function(pt1,pt2,pt3){var dx1=pt1[0]-pt2[0];var dy1=pt1[1]-pt2[1];var dx2=pt2[0]-pt3[0];var dy2=pt2[1]-pt3[1];return Math.abs(dx1*dy2-dx2*dy1)<eps},linesIntersect:function(a0,a1,b0,b1){var adx=a1[0]-a0[0];var ady=a1[1]-a0[1];var bdx=b1[0]-b0[0];var bdy=b1[1]-b0[1];var axb=adx*bdy-ady*bdx;if(Math.abs(axb)<eps)return false;var dx=a0[0]-b0[0];var dy=a0[1]-b0[1];var A=(bdx*dy-bdy*dx)/axb;var B=(adx*dy-ady*dx)/axb;var ret={alongA:0,alongB:0,pt:[a0[0]+A*adx,a0[1]+A*ady]};if(A<=-eps)ret.alongA=-2;else if(A<eps)ret.alongA=-1;else if(A-1<=-eps)ret.alongA=0;else if(A-1<eps)ret.alongA=1;else ret.alongA=2;if(B<=-eps)ret.alongB=-2;else if(B<eps)ret.alongB=-1;else if(B-1<=-eps)ret.alongB=0;else if(B-1<eps)ret.alongB=1;else ret.alongB=2;return ret},pointInsideRegion:function(pt,region){var x=pt[0];var y=pt[1];var last_x=region[region.length-1][0];var last_y=region[region.length-1][1];var inside=false;for(var i=0;i<region.length;i++){var curr_x=region[i][0];var curr_y=region[i][1];if(curr_y-y>eps!=last_y-y>eps&&(last_x-curr_x)*(y-curr_y)/(last_y-curr_y)+curr_x-x>eps)inside=!inside;last_x=curr_x;last_y=curr_y}return inside}};return my}module.exports=Epsilon},{}],4:[function(require,module,exports){var GeoJSON={toPolygon:function(PolyBool,geojson){function GeoPoly(coords){if(coords.length<=0)return PolyBool.segments({inverted:false,regions:[]});function LineString(ls){var reg=ls.slice(0,ls.length-1);return PolyBool.segments({inverted:false,regions:[reg]})}var out=LineString(coords[0]);for(var i=1;i<coords.length;i++)out=PolyBool.selectDifference(PolyBool.combine(out,LineString(coords[i])));return out}if(geojson.type==="Polygon"){return PolyBool.polygon(GeoPoly(geojson.coordinates))}else if(geojson.type==="MultiPolygon"){var out=PolyBool.segments({inverted:false,regions:[]});for(var i=0;i<geojson.coordinates.length;i++)out=PolyBool.selectUnion(PolyBool.combine(out,GeoPoly(geojson.coordinates[i])));return PolyBool.polygon(out)}throw new Error("PolyBool: Cannot convert GeoJSON object to PolyBool polygon")},fromPolygon:function(PolyBool,eps,poly){poly=PolyBool.polygon(PolyBool.segments(poly));function regionInsideRegion(r1,r2){return eps.pointInsideRegion([(r1[0][0]+r1[1][0])*.5,(r1[0][1]+r1[1][1])*.5],r2)}function newNode(region){return{region:region,children:[]}}var roots=newNode(null);function addChild(root,region){for(var i=0;i<root.children.length;i++){var child=root.children[i];if(regionInsideRegion(region,child.region)){addChild(child,region);return}}var node=newNode(region);for(var i=0;i<root.children.length;i++){var child=root.children[i];if(regionInsideRegion(child.region,region)){node.children.push(child);root.children.splice(i,1);i--}}root.children.push(node)}for(var i=0;i<poly.regions.length;i++){var region=poly.regions[i];if(region.length<3)continue;addChild(roots,region)}function forceWinding(region,clockwise){var winding=0;var last_x=region[region.length-1][0];var last_y=region[region.length-1][1];var copy=[];for(var i=0;i<region.length;i++){var curr_x=region[i][0];var curr_y=region[i][1];copy.push([curr_x,curr_y]);winding+=curr_y*last_x-curr_x*last_y;last_x=curr_x;last_y=curr_y}var isclockwise=winding<0;if(isclockwise!==clockwise)copy.reverse();copy.push([copy[0][0],copy[0][1]]);return copy}var geopolys=[];function addExterior(node){var poly=[forceWinding(node.region,false)];geopolys.push(poly);for(var i=0;i<node.children.length;i++)poly.push(getInterior(node.children[i]))}function getInterior(node){for(var i=0;i<node.children.length;i++)addExterior(node.children[i]);return forceWinding(node.region,true)}for(var i=0;i<roots.children.length;i++)addExterior(roots.children[i]);if(geopolys.length<=0)return{type:"Polygon",coordinates:[]};if(geopolys.length==1)return{type:"Polygon",coordinates:geopolys[0]};return{type:"MultiPolygon",coordinates:geopolys}}};module.exports=GeoJSON},{}],5:[function(require,module,exports){var LinkedList=require("./linked-list");function Intersecter(selfIntersection,eps,buildLog){function segmentNew(start,end){return{id:buildLog?buildLog.segmentId():-1,start:start,end:end,myFill:{above:null,below:null},otherFill:null}}function segmentCopy(start,end,seg){return{id:buildLog?buildLog.segmentId():-1,start:start,end:end,myFill:{above:seg.myFill.above,below:seg.myFill.below},otherFill:null}}var event_root=LinkedList.create();function eventCompare(p1_isStart,p1_1,p1_2,p2_isStart,p2_1,p2_2){var comp=eps.pointsCompare(p1_1,p2_1);if(comp!==0)return comp;if(eps.pointsSame(p1_2,p2_2))return 0;if(p1_isStart!==p2_isStart)return p1_isStart?1:-1;return eps.pointAboveOrOnLine(p1_2,p2_isStart?p2_1:p2_2,p2_isStart?p2_2:p2_1)?1:-1}function eventAdd(ev,other_pt){event_root.insertBefore(ev,function(here){var comp=eventCompare(ev.isStart,ev.pt,other_pt,here.isStart,here.pt,here.other.pt);return comp<0})}function eventAddSegmentStart(seg,primary){var ev_start=LinkedList.node({isStart:true,pt:seg.start,seg:seg,primary:primary,other:null,status:null});eventAdd(ev_start,seg.end);return ev_start}function eventAddSegmentEnd(ev_start,seg,primary){var ev_end=LinkedList.node({isStart:false,pt:seg.end,seg:seg,primary:primary,other:ev_start,status:null});ev_start.other=ev_end;eventAdd(ev_end,ev_start.pt)}function eventAddSegment(seg,primary){var ev_start=eventAddSegmentStart(seg,primary);eventAddSegmentEnd(ev_start,seg,primary);return ev_start}function eventUpdateEnd(ev,end){if(buildLog)buildLog.segmentChop(ev.seg,end);ev.other.remove();ev.seg.end=end;ev.other.pt=end;eventAdd(ev.other,ev.pt)}function eventDivide(ev,pt){var ns=segmentCopy(pt,ev.seg.end,ev.seg);eventUpdateEnd(ev,pt);return eventAddSegment(ns,ev.primary)}function calculate(primaryPolyInverted,secondaryPolyInverted){var status_root=LinkedList.create();function statusCompare(ev1,ev2){var a1=ev1.seg.start;var a2=ev1.seg.end;var b1=ev2.seg.start;var b2=ev2.seg.end;if(eps.pointsCollinear(a1,b1,b2)){if(eps.pointsCollinear(a2,b1,b2))return 1;return eps.pointAboveOrOnLine(a2,b1,b2)?1:-1}return eps.pointAboveOrOnLine(a1,b1,b2)?1:-1}function statusFindSurrounding(ev){return status_root.findTransition(function(here){var comp=statusCompare(ev,here.ev);return comp>0})}function checkIntersection(ev1,ev2){var seg1=ev1.seg;var seg2=ev2.seg;var a1=seg1.start;var a2=seg1.end;var b1=seg2.start;var b2=seg2.end;if(buildLog)buildLog.checkIntersection(seg1,seg2);var i=eps.linesIntersect(a1,a2,b1,b2);if(i===false){if(!eps.pointsCollinear(a1,a2,b1))return false;if(eps.pointsSame(a1,b2)||eps.pointsSame(a2,b1))return false;var a1_equ_b1=eps.pointsSame(a1,b1);var a2_equ_b2=eps.pointsSame(a2,b2);if(a1_equ_b1&&a2_equ_b2)return ev2;var a1_between=!a1_equ_b1&&eps.pointBetween(a1,b1,b2);var a2_between=!a2_equ_b2&&eps.pointBetween(a2,b1,b2);if(a1_equ_b1){if(a2_between){eventDivide(ev2,a2)}else{eventDivide(ev1,b2)}return ev2}else if(a1_between){if(!a2_equ_b2){if(a2_between){eventDivide(ev2,a2)}else{eventDivide(ev1,b2)}}eventDivide(ev2,a1)}}else{if(i.alongA===0){if(i.alongB===-1)eventDivide(ev1,b1);else if(i.alongB===0)eventDivide(ev1,i.pt);else if(i.alongB===1)eventDivide(ev1,b2)}if(i.alongB===0){if(i.alongA===-1)eventDivide(ev2,a1);else if(i.alongA===0)eventDivide(ev2,i.pt);else if(i.alongA===1)eventDivide(ev2,a2)}}return false}var segments=[];while(!event_root.isEmpty()){var ev=event_root.getHead();if(buildLog)buildLog.vert(ev.pt[0]);if(ev.isStart){if(buildLog)buildLog.segmentNew(ev.seg,ev.primary);var surrounding=statusFindSurrounding(ev);var above=surrounding.before?surrounding.before.ev:null;var below=surrounding.after?surrounding.after.ev:null;if(buildLog){buildLog.tempStatus(ev.seg,above?above.seg:false,below?below.seg:false)}function checkBothIntersections(){if(above){var eve=checkIntersection(ev,above);if(eve)return eve}if(below)return checkIntersection(ev,below);return false}var eve=checkBothIntersections();if(eve){if(selfIntersection){var toggle;if(ev.seg.myFill.below===null)toggle=true;else toggle=ev.seg.myFill.above!==ev.seg.myFill.below;if(toggle)eve.seg.myFill.above=!eve.seg.myFill.above}else{eve.seg.otherFill=ev.seg.myFill}if(buildLog)buildLog.segmentUpdate(eve.seg);ev.other.remove();ev.remove()}if(event_root.getHead()!==ev){if(buildLog)buildLog.rewind(ev.seg);continue}if(selfIntersection){var toggle;if(ev.seg.myFill.below===null)toggle=true;else toggle=ev.seg.myFill.above!==ev.seg.myFill.below;if(!below){ev.seg.myFill.below=primaryPolyInverted}else{ev.seg.myFill.below=below.seg.myFill.above}if(toggle)ev.seg.myFill.above=!ev.seg.myFill.below;else ev.seg.myFill.above=ev.seg.myFill.below}else{if(ev.seg.otherFill===null){var inside;if(!below){inside=ev.primary?secondaryPolyInverted:primaryPolyInverted}else{if(ev.primary===below.primary)inside=below.seg.otherFill.above;else inside=below.seg.myFill.above}ev.seg.otherFill={above:inside,below:inside}}}if(buildLog){buildLog.status(ev.seg,above?above.seg:false,below?below.seg:false)}ev.other.status=surrounding.insert(LinkedList.node({ev:ev}))}else{var st=ev.status;if(st===null){throw new Error("PolyBool: Zero-length segment detected; your epsilon is "+"probably too small or too large")}if(status_root.exists(st.prev)&&status_root.exists(st.next))checkIntersection(st.prev.ev,st.next.ev);if(buildLog)buildLog.statusRemove(st.ev.seg);st.remove();if(!ev.primary){var s=ev.seg.myFill;ev.seg.myFill=ev.seg.otherFill;ev.seg.otherFill=s}segments.push(ev.seg)}event_root.getHead().remove()}if(buildLog)buildLog.done();return segments}if(!selfIntersection){return{calculate:function(segments1,inverted1,segments2,inverted2){segments1.forEach(function(seg){eventAddSegment(segmentCopy(seg.start,seg.end,seg),true)});segments2.forEach(function(seg){eventAddSegment(segmentCopy(seg.start,seg.end,seg),false)});return calculate(inverted1,inverted2)}}}return{addRegion:function(region){var pt1;var pt2=region[region.length-1];for(var i=0;i<region.length;i++){pt1=pt2;pt2=region[i];var forward=eps.pointsCompare(pt1,pt2);if(forward===0)continue;eventAddSegment(segmentNew(forward<0?pt1:pt2,forward<0?pt2:pt1),true)}},calculate:function(inverted){return calculate(inverted,false)}}}module.exports=Intersecter},{"./linked-list":6}],6:[function(require,module,exports){var LinkedList={create:function(){var my={root:{root:true,next:null},exists:function(node){if(node===null||node===my.root)return false;return true},isEmpty:function(){return my.root.next===null},getHead:function(){return my.root.next},insertBefore:function(node,check){var last=my.root;var here=my.root.next;while(here!==null){if(check(here)){node.prev=here.prev;node.next=here;here.prev.next=node;here.prev=node;return}last=here;here=here.next}last.next=node;node.prev=last;node.next=null},findTransition:function(check){var prev=my.root;var here=my.root.next;while(here!==null){if(check(here))break;prev=here;here=here.next}return{before:prev===my.root?null:prev,after:here,insert:function(node){node.prev=prev;node.next=here;prev.next=node;if(here!==null)here.prev=node;return node}}}};return my},node:function(data){data.prev=null;data.next=null;data.remove=function(){data.prev.next=data.next;if(data.next)data.next.prev=data.prev;data.prev=null;data.next=null};return data}};module.exports=LinkedList},{}],7:[function(require,module,exports){function SegmentChainer(segments,eps,buildLog){var chains=[];var regions=[];segments.forEach(function(seg){var pt1=seg.start;var pt2=seg.end;if(eps.pointsSame(pt1,pt2)){console.warn("PolyBool: Warning: Zero-length segment detected; your epsilon is "+"probably too small or too large");return}if(buildLog)buildLog.chainStart(seg);var first_match={index:0,matches_head:false,matches_pt1:false};var second_match={index:0,matches_head:false,matches_pt1:false};var next_match=first_match;function setMatch(index,matches_head,matches_pt1){next_match.index=index;next_match.matches_head=matches_head;next_match.matches_pt1=matches_pt1;if(next_match===first_match){next_match=second_match;return false}next_match=null;return true}for(var i=0;i<chains.length;i++){var chain=chains[i];var head=chain[0];var head2=chain[1];var tail=chain[chain.length-1];var tail2=chain[chain.length-2];if(eps.pointsSame(head,pt1)){if(setMatch(i,true,true))break}else if(eps.pointsSame(head,pt2)){if(setMatch(i,true,false))break}else if(eps.pointsSame(tail,pt1)){if(setMatch(i,false,true))break}else if(eps.pointsSame(tail,pt2)){if(setMatch(i,false,false))break}}if(next_match===first_match){chains.push([pt1,pt2]);if(buildLog)buildLog.chainNew(pt1,pt2);return}if(next_match===second_match){if(buildLog)buildLog.chainMatch(first_match.index);var index=first_match.index;var pt=first_match.matches_pt1?pt2:pt1;var addToHead=first_match.matches_head;var chain=chains[index];var grow=addToHead?chain[0]:chain[chain.length-1];var grow2=addToHead?chain[1]:chain[chain.length-2];var oppo=addToHead?chain[chain.length-1]:chain[0];var oppo2=addToHead?chain[chain.length-2]:chain[1];if(eps.pointsCollinear(grow2,grow,pt)){if(addToHead){if(buildLog)buildLog.chainRemoveHead(first_match.index,pt);chain.shift()}else{if(buildLog)buildLog.chainRemoveTail(first_match.index,pt);chain.pop()}grow=grow2}if(eps.pointsSame(oppo,pt)){chains.splice(index,1);if(eps.pointsCollinear(oppo2,oppo,grow)){if(addToHead){if(buildLog)buildLog.chainRemoveTail(first_match.index,grow);chain.pop()}else{if(buildLog)buildLog.chainRemoveHead(first_match.index,grow);chain.shift()}}if(buildLog)buildLog.chainClose(first_match.index);regions.push(chain);return}if(addToHead){if(buildLog)buildLog.chainAddHead(first_match.index,pt);chain.unshift(pt)}else{if(buildLog)buildLog.chainAddTail(first_match.index,pt);chain.push(pt)}return}function reverseChain(index){if(buildLog)buildLog.chainReverse(index);chains[index].reverse()}function appendChain(index1,index2){var chain1=chains[index1];var chain2=chains[index2];var tail=chain1[chain1.length-1];var tail2=chain1[chain1.length-2];var head=chain2[0];var head2=chain2[1];if(eps.pointsCollinear(tail2,tail,head)){if(buildLog)buildLog.chainRemoveTail(index1,tail);chain1.pop();tail=tail2}if(eps.pointsCollinear(tail,head,head2)){if(buildLog)buildLog.chainRemoveHead(index2,head);chain2.shift()}if(buildLog)buildLog.chainJoin(index1,index2);chains[index1]=chain1.concat(chain2);chains.splice(index2,1)}var F=first_match.index;var S=second_match.index;if(buildLog)buildLog.chainConnect(F,S);var reverseF=chains[F].length<chains[S].length;if(first_match.matches_head){if(second_match.matches_head){if(reverseF){reverseChain(F);appendChain(F,S)}else{reverseChain(S);appendChain(S,F)}}else{appendChain(S,F)}}else{if(second_match.matches_head){appendChain(F,S)}else{if(reverseF){reverseChain(F);appendChain(S,F)}else{reverseChain(S);appendChain(F,S)}}}});return regions}module.exports=SegmentChainer},{}],8:[function(require,module,exports){function select(segments,selection,buildLog){var result=[];segments.forEach(function(seg){var index=(seg.myFill.above?8:0)+(seg.myFill.below?4:0)+(seg.otherFill&&seg.otherFill.above?2:0)+(seg.otherFill&&seg.otherFill.below?1:0);if(selection[index]!==0){result.push({id:buildLog?buildLog.segmentId():-1,start:seg.start,end:seg.end,myFill:{above:selection[index]===1,below:selection[index]===2},otherFill:null})}});if(buildLog)buildLog.selected(result);return result}var SegmentSelector={union:function(segments,buildLog){return select(segments,[0,2,1,0,2,2,0,0,1,0,1,0,0,0,0,0],buildLog)},intersect:function(segments,buildLog){return select(segments,[0,0,0,0,0,2,0,2,0,0,1,1,0,2,1,0],buildLog)},difference:function(segments,buildLog){return select(segments,[0,0,0,0,2,0,2,0,1,1,0,0,0,1,2,0],buildLog)},differenceRev:function(segments,buildLog){return select(segments,[0,2,1,0,0,0,1,1,0,2,0,2,0,0,0,0],buildLog)},xor:function(segments,buildLog){return select(segments,[0,2,1,0,2,0,0,1,1,0,0,2,0,1,2,0],buildLog)}};module.exports=SegmentSelector},{}]},{},[1]);