From eb9aec19d809bda9a4c2d39fc9255f0faf72e705 Mon Sep 17 00:00:00 2001
From: thePR0M3TH3AN <53631862+PR0M3TH3AN@users.noreply.github.com>
Date: Tue, 2 Jun 2026 08:54:26 -0400
Subject: [PATCH] pathfinder: Unite / Subtract / Intersect / Exclude on shape
 selection
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Boolean ops on 2+ selected shape layers, backed by the vendored
polygon-clipping library (29 KB minified, MIT) loaded from
src/vendor/. Adds a new "Pathfinder" details block in the sidebar
under Align & distribute.

- Unite combines all selected shapes into one outline.
- Subtract removes upper shapes from the bottom-most shape.
- Intersect keeps only the overlapping region.
- Exclude keeps only the non-overlapping regions (XOR).

Pipeline: each selected layer's pen path is sampled to a polygon
(16 samples per Bézier segment, in world inches), the chosen op
runs, and the result is rebuilt as a new pen layer that inherits
the bottom-most input layer's z-order, target, fill and stroke —
matching Illustrator's Pathfinder convention. Non-pen primitives
(rect, circle, etc.) are auto-converted to pen paths first.

Limitations baked in:
- Rotated layers aren't supported yet (we'd need to rotate the
  sampled polygon before clipping). The op refuses with a toast.
- Curves are flattened — the result is a polygon approximation
  with `fill-rule: evenodd` so multi-ring outputs (donut from a
  subtraction) render correctly. The renderer learned to honor
  shape.fillRule for this commit.
- Multi-polygon results stay rendered correctly but only the
  first polygon's outer ring is preserved in pen.nodes, so
  Direct Select editing post-op is partial.
---
 src/index.html                     | 184 ++++++++++++++++++++++++++++-
 src/vendor/polygon-clipping.min.js |  24 ++++
 2 files changed, 207 insertions(+), 1 deletion(-)
 create mode 100644 src/vendor/polygon-clipping.min.js

diff --git a/src/index.html b/src/index.html
index ad47620..3f3f74e 100644
--- a/src/index.html
+++ b/src/index.html
@@ -3746,6 +3746,19 @@
               <button type="button" id="distributeY" title="Distribute vertical spacing evenly">↕ Distribute V</button>
             </div>
           </details>
+
+          <details id="pathfinderDetails" style="margin-top:10px">
+            <summary style="cursor:pointer;font-size:.82rem;font-weight:600">Pathfinder</summary>
+            <p class="hint">Boolean ops on 2+ selected shape layers. Result is a polygon approximation (curves get flattened). Non-pen primitives are auto-converted; rotated shapes aren’t supported yet.</p>
+            <div class="buttonRow">
+              <button type="button" id="pathfinderUnite"     title="Combine all selected shapes into one">Unite</button>
+              <button type="button" id="pathfinderSubtract"  title="Subtract upper shapes from the bottom-most one">Subtract</button>
+            </div>
+            <div class="buttonRow">
+              <button type="button" id="pathfinderIntersect" title="Keep only the overlapping region">Intersect</button>
+              <button type="button" id="pathfinderExclude"   title="Keep only the non-overlapping regions">Exclude</button>
+            </div>
+          </details>
         </details>
 
         <p class="hint">Click a layer to select it. Shift/Ctrl/Cmd-click to select multiple layers, then drag any selected layer to move the set together. Text layers are editable in place.</p>
@@ -4919,6 +4932,7 @@
   </div>
 
   <script src="vendor/qrcode.min.js"></script>
+  <script src="vendor/polygon-clipping.min.js"></script>
   <script>
     const $ = (id) => document.getElementById(id);
     const safe$ = (id) => { try { return $(id); } catch { return null; } };
@@ -10609,6 +10623,169 @@
       return true;
     }
 
+    // ---- Pathfinder: boolean ops on selected shape layers --------
+    //
+    // Backed by the vendored polygon-clipping library (window.polygonClipping).
+    // The library operates on MultiPolygon geometries: [polygon, ...] where
+    // polygon = [outerRing, innerRing, ...] and ring = [[x,y], ...]. Curves
+    // can't be represented exactly so we sample each Bézier segment into a
+    // polyline; the result of every op is therefore a polygon approximation
+    // (matches what Illustrator's Pathfinder also produces internally).
+    function _samplePenLayerToWorldRing(layer, samplesPerSeg) {
+      const pen = layer.shape?.pen;
+      if (!pen?.nodes || pen.nodes.length < 2) return null;
+      const nodes = pen.nodes;
+      const vb = layer.shape.viewBox || { x: 0, y: 0, w: (Number(layer.w)||0)*96, h: (Number(layer.h)||0)*96 };
+      const lw = Number(layer.w) || 0, lh = Number(layer.h) || 0;
+      const vbw = Math.max(0.0001, Number(vb.w) || 0.0001);
+      const vbh = Math.max(0.0001, Number(vb.h) || 0.0001);
+      const toWorld = (p) => [
+        (Number(layer.x) || 0) + (p.x - (Number(vb.x) || 0)) / vbw * lw,
+        (Number(layer.y) || 0) + (p.y - (Number(vb.y) || 0)) / vbh * lh,
+      ];
+      const ring = [];
+      const closed = !!pen.closed;
+      const segCount = closed ? nodes.length : nodes.length - 1;
+      ring.push(toWorld(nodes[0]));
+      for (let i = 0; i < segCount; i++) {
+        const a = nodes[i], b = nodes[(i + 1) % nodes.length];
+        const inner = sampleSegment(a, b, samplesPerSeg);
+        for (const s of inner) ring.push(toWorld(s));
+        ring.push(toWorld(b));
+      }
+      // polygon-clipping wants closed rings to end at the start point.
+      // For an open path, force-close: the user picked Pathfinder which only
+      // makes sense for filled regions, so treat open paths as polylines
+      // that get closed by a straight segment.
+      if (ring.length > 0) {
+        const first = ring[0], last = ring[ring.length - 1];
+        if (first[0] !== last[0] || first[1] !== last[1]) ring.push([first[0], first[1]]);
+      }
+      return ring;
+    }
+
+    function layerToWorldMultiPolygon(layer, samplesPerSeg = 16) {
+      const ring = _samplePenLayerToWorldRing(layer, samplesPerSeg);
+      if (!ring || ring.length < 4) return null;
+      return [[ring]];
+    }
+
+    function worldMultiPolygonToShapeLayer(mp, attrs) {
+      if (!mp || !mp.length) return null;
+      let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
+      for (const poly of mp) {
+        for (const ring of poly) {
+          for (const [x, y] of ring) {
+            if (x < minX) minX = x;
+            if (y < minY) minY = y;
+            if (x > maxX) maxX = x;
+            if (y > maxY) maxY = y;
+          }
+        }
+      }
+      if (!Number.isFinite(minX)) return null;
+      const w = Math.max(0.05, maxX - minX);
+      const h = Math.max(0.05, maxY - minY);
+      const sx = 96, sy = 96;
+      // d-string: each ring becomes its own M..L..Z subpath. Outer +
+      // hole rings of a single polygon share fill via even-odd winding.
+      let d = '';
+      for (const poly of mp) {
+        for (const ring of poly) {
+          ring.forEach((pt, i) => {
+            const px = ((pt[0] - minX) * sx).toFixed(2);
+            const py = ((pt[1] - minY) * sy).toFixed(2);
+            d += (i === 0 ? `M ${px} ${py}` : ` L ${px} ${py}`);
+          });
+          d += ' Z';
+        }
+      }
+      // Pen.nodes for the first polygon's outer ring so the result is
+      // still editable with the Direct Select / Pen tools.
+      const firstRing = mp[0][0];
+      const ringForNodes = firstRing[0][0] === firstRing[firstRing.length - 1][0]
+                        && firstRing[0][1] === firstRing[firstRing.length - 1][1]
+        ? firstRing.slice(0, -1) : firstRing;
+      const nodes = ringForNodes.map(([x, y]) => ({
+        x: (x - minX) * sx,
+        y: (y - minY) * sy,
+        hIn: null, hOut: null, kind: 'corner',
+      }));
+      return {
+        type: 'shape',
+        target: attrs?.target || (typeof currentDrawTarget === 'function' ? currentDrawTarget() : 'page'),
+        x: minX, y: minY, w, h,
+        rotate: 0, opacity: 1, z: attrs?.z ?? nextLayerZ(),
+        name: attrs?.name || 'Pathfinder result',
+        shape: {
+          kind: 'path',
+          d,
+          viewBox: { x: 0, y: 0, w: w * sx, h: h * sy },
+          pen: { closed: true, tool: 'pen', nodes },
+          fillRule: 'evenodd',
+        },
+        fill: attrs?.fill || { type: 'solid', color: '#3b82f6' },
+        stroke: attrs?.stroke || { type: 'none', color: '#000000', width: 0, dash: 'solid' },
+      };
+    }
+
+    // op: 'union' | 'intersection' | 'difference' | 'xor'
+    function runPathfinder(op) {
+      if (typeof window.polygonClipping !== 'object' || !window.polygonClipping?.union) {
+        toastError?.('Pathfinder library failed to load.');
+        return;
+      }
+      const layers = selectedLayers().filter(l => l && l.type === 'shape' && !l.locked && !l._generatedDiscLayer);
+      if (layers.length < 2) { toastError?.('Select at least two shape layers.'); return; }
+      const rotated = layers.find(l => (Number(l.rotate) || 0) !== 0);
+      if (rotated) { toastError?.('Pathfinder doesn’t support rotated shapes yet. Set rotation to 0 first.'); return; }
+      // Auto-convert any non-pen shape (rect, circle, etc.) to a pen
+      // path so we have nodes to sample. Bails out for SVG / multi-element layers.
+      for (const l of layers) {
+        if (!l.shape?.pen) {
+          const r = convertShapeToEditablePath(l);
+          if (!r.ok) { toastError?.(`Can't run Pathfinder on "${l.name || 'layer'}": ${r.reason}`); return; }
+        }
+      }
+      const polys = layers.map(l => layerToWorldMultiPolygon(l)).filter(Boolean);
+      if (polys.length < 2) { toastError?.('Could not sample selected paths.'); return; }
+      let result;
+      try {
+        if (op === 'union')        result = window.polygonClipping.union(...polys);
+        else if (op === 'intersection') result = window.polygonClipping.intersection(...polys);
+        else if (op === 'difference')   result = window.polygonClipping.difference(polys[0], ...polys.slice(1));
+        else if (op === 'xor')     result = window.polygonClipping.xor(...polys);
+      } catch (err) {
+        console.warn('Pathfinder', op, 'failed:', err);
+        toastError?.('Pathfinder failed on these shapes — try simpler paths.');
+        return;
+      }
+      if (!result || !result.length) {
+        toastError?.('Pathfinder produced no result (shapes may not overlap).');
+        return;
+      }
+      pushHistory(`pathfinder ${op}`);
+      // Inherit style + z + target from the BOTTOM-most layer of the
+      // selection (matches Illustrator's Pathfinder convention).
+      const sortedByZ = [...layers].sort((a, b) => (Number(a.z) || 0) - (Number(b.z) || 0));
+      const bottom = sortedByZ[0];
+      const opName = { union: 'Unite', intersection: 'Intersect', difference: 'Subtract', xor: 'Exclude' }[op] || 'Pathfinder';
+      const newLayer = worldMultiPolygonToShapeLayer(result, {
+        z: bottom.z,
+        target: bottom.target,
+        fill: bottom.fill ? { ...bottom.fill } : undefined,
+        stroke: bottom.stroke ? { ...bottom.stroke } : undefined,
+        name: `${opName} result`,
+      });
+      if (!newLayer) { toastError?.('Could not build result layer.'); return; }
+      newLayer.id = makeLayerId();
+      const removeIds = new Set(layers.map(l => l.id));
+      state.layers = state.layers.filter(l => !removeIds.has(l.id));
+      state.layers.push(newLayer);
+      setLayerSelection([newLayer.id], newLayer.id);
+      render();
+    }
+
     function deletePenAnchors(layer, idxList) {
       const nodes = layer.shape.pen.nodes;
       const sorted = Array.from(new Set(idxList))
@@ -16001,7 +16178,8 @@
           const sy = vb.h > 0 ? H / vb.h : 1;
           // SVG transform applies right-to-left: translate the path's bbox to
           // the origin, then scale so it fills the 100×vbH shape space.
-          body = `<g transform="scale(${sx.toFixed(6)} ${sy.toFixed(6)}) translate(${(-vb.x).toFixed(3)} ${(-vb.y).toFixed(3)})"><path d="${escapeHtml(d)}" fill="${fillAttr}"${strokeAttr}/></g>`;
+          const fr = shape.fillRule === 'evenodd' ? ' fill-rule="evenodd"' : '';
+          body = `<g transform="scale(${sx.toFixed(6)} ${sy.toFixed(6)}) translate(${(-vb.x).toFixed(3)} ${(-vb.y).toFixed(3)})"><path d="${escapeHtml(d)}" fill="${fillAttr}"${fr}${strokeAttr}/></g>`;
         }
       } else if (kind === 'svg') {
         // Pre-sanitized multi-element SVG content. Fills / strokes are baked
@@ -30016,6 +30194,10 @@
       on('alignBottom',  'click', () => alignSelection('bottom'));
       on('distributeX',  'click', () => distributeSelection('x'));
       on('distributeY',  'click', () => distributeSelection('y'));
+      on('pathfinderUnite',     'click', () => runPathfinder('union'));
+      on('pathfinderSubtract',  'click', () => runPathfinder('difference'));
+      on('pathfinderIntersect', 'click', () => runPathfinder('intersection'));
+      on('pathfinderExclude',   'click', () => runPathfinder('xor'));
 
       $('deleteLayer').addEventListener('click', deleteSelectedLayer);
 
diff --git a/src/vendor/polygon-clipping.min.js b/src/vendor/polygon-clipping.min.js
new file mode 100644
index 0000000..f3a6f7d
--- /dev/null
+++ b/src/vendor/polygon-clipping.min.js
@@ -0,0 +1,24 @@
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).polygonClipping=e()}(this,(function(){"use strict";
+/**
+     * splaytree v3.1.2
+     * Fast Splay tree for Node and browser
+     *
+     * @author Alexander Milevski <info@w8r.name>
+     * @license MIT
+     * @preserve
+     */
+/*! *****************************************************************************
+    Copyright (c) Microsoft Corporation. All rights reserved.
+    Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+    this file except in compliance with the License. You may obtain a copy of the
+    License at http://www.apache.org/licenses/LICENSE-2.0
+
+    THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+    WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+    MERCHANTABLITY OR NON-INFRINGEMENT.
+
+    See the Apache Version 2.0 License for specific language governing permissions
+    and limitations under the License.
+    ***************************************************************************** */function t(t,e){var n,r,i,o,s={label:0,sent:function(){if(1&i[0])throw i[1];return i[1]},trys:[],ops:[]};return o={next:l(0),throw:l(1),return:l(2)},"function"==typeof Symbol&&(o[Symbol.iterator]=function(){return this}),o;function l(o){return function(l){return function(o){if(n)throw new TypeError("Generator is already executing.");for(;s;)try{if(n=1,r&&(i=2&o[0]?r.return:o[0]?r.throw||((i=r.return)&&i.call(r),0):r.next)&&!(i=i.call(r,o[1])).done)return i;switch(r=0,i&&(o=[2&o[0],i.value]),o[0]){case 0:case 1:i=o;break;case 4:return s.label++,{value:o[1],done:!1};case 5:s.label++,r=o[1],o=[0];continue;case 7:o=s.ops.pop(),s.trys.pop();continue;default:if(!(i=s.trys,(i=i.length>0&&i[i.length-1])||6!==o[0]&&2!==o[0])){s=0;continue}if(3===o[0]&&(!i||o[1]>i[0]&&o[1]<i[3])){s.label=o[1];break}if(6===o[0]&&s.label<i[1]){s.label=i[1],i=o;break}if(i&&s.label<i[2]){s.label=i[2],s.ops.push(o);break}i[2]&&s.ops.pop(),s.trys.pop();continue}o=e.call(t,s)}catch(t){o=[6,t],r=0}finally{n=i=0}if(5&o[0])throw o[1];return{value:o[0]?o[1]:void 0,done:!0}}([o,l])}}}var e=function(t,e){this.next=null,this.key=t,this.data=e,this.left=null,this.right=null};function n(t,e){return t>e?1:t<e?-1:0}function r(t,n,r){for(var i=new e(null,null),o=i,s=i;;){var l=r(t,n.key);if(l<0){if(null===n.left)break;if(r(t,n.left.key)<0){var h=n.left;if(n.left=h.right,h.right=n,null===(n=h).left)break}s.left=n,s=n,n=n.left}else{if(!(l>0))break;if(null===n.right)break;if(r(t,n.right.key)>0){h=n.right;if(n.right=h.left,h.left=n,null===(n=h).right)break}o.right=n,o=n,n=n.right}}return o.right=n.left,s.left=n.right,n.left=i.right,n.right=i.left,n}function i(t,n,i,o){var s=new e(t,n);if(null===i)return s.left=s.right=null,s;var l=o(t,(i=r(t,i,o)).key);return l<0?(s.left=i.left,s.right=i,i.left=null):l>=0&&(s.right=i.right,s.left=i,i.right=null),s}function o(t,e,n){var i=null,o=null;if(e){var s=n((e=r(t,e,n)).key,t);0===s?(i=e.left,o=e.right):s<0?(o=e.right,e.right=null,i=e):(i=e.left,e.left=null,o=e)}return{left:i,right:o}}function s(t,e,n,r,i){if(t){r(e+(n?"└── ":"├── ")+i(t)+"\n");var o=e+(n?"    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F(l,h,[n],[o])}replaceRightSE(t){this.rightSE=t,this.rightSE.segment=this,this.rightSE.otherSE=this.leftSE,this.leftSE.otherSE=this.rightSE}bbox(){const t=this.leftSE.point.y,e=this.rightSE.point.y;return{ll:{x:this.leftSE.point.x,y:t<e?t:e},ur:{x:this.rightSE.point.x,y:t>e?t:e}}}vector(){return{x:this.rightSE.point.x-this.leftSE.point.x,y:this.rightSE.point.y-this.leftSE.point.y}}isAnEndpoint(t){return t.x===this.leftSE.point.x&&t.y===this.leftSE.point.y||t.x===this.rightSE.point.x&&t.y===this.rightSE.point.y}comparePoint(t){if(this.isAnEndpoint(t))return 0;const e=this.leftSE.point,n=this.rightSE.point,r=this.vector();if(e.x===n.x)return t.x===e.x?0:t.x<e.x?1:-1;const i=(t.y-e.y)/r.y,o=e.x+i*r.x;if(t.x===o)return 0;const s=(t.x-e.x)/r.x,l=e.y+s*r.y;return t.y===l?0:t.y<l?-1:1}getIntersection(t){const e=this.bbox(),n=t.bbox(),r=p(e,n);if(null===r)return null;const i=this.leftSE.point,o=this.rightSE.point,s=t.leftSE.point,l=t.rightSE.point,h=c(e,s)&&0===this.comparePoint(s),u=c(n,i)&&0===t.comparePoint(i),f=c(e,l)&&0===this.comparePoint(l),g=c(n,o)&&0===t.comparePoint(o);if(u&&h)return g&&!f?o:!g&&f?l:null;if(u)return f&&i.x===l.x&&i.y===l.y?null:i;if(h)return g&&o.x===s.x&&o.y===s.y?null:s;if(g&&f)return null;if(g)return o;if(f)return l;const a=((t,e,n,r)=>{if(0===e.x)return T(n,r,t.x);if(0===r.x)return T(t,e,n.x);if(0===e.y)return G(n,r,t.y);if(0===r.y)return G(t,e,n.y);const i=O(e,r);if(0==i)return null;const o={x:n.x-t.x,y:n.y-t.y},s=O(o,e)/i,l=O(o,r)/i;return{x:(t.x+l*e.x+(n.x+s*r.x))/2,y:(t.y+l*e.y+(n.y+s*r.y))/2}})(i,this.vector(),s,t.vector());return null===a?null:c(r,a)?b.round(a.x,a.y):null}split(t){const e=[],n=void 0!==t.events,r=new q(t,!0),i=new q(t,!1),o=this.rightSE;this.replaceRightSE(i),e.push(i),e.push(r);const s=new F(r,o,this.rings.slice(),this.windings.slice());return q.comparePoints(s.leftSE.point,s.rightSE.point)>0&&s.swapEvents(),q.comparePoints(this.leftSE.point,this.rightSE.point)>0&&this.swapEvents(),n&&(r.checkForConsuming(),i.checkForConsuming()),e}swapEvents(){const t=this.rightSE;this.rightSE=this.leftSE,this.leftSE=t,this.leftSE.isLeft=!0,this.rightSE.isLeft=!1;for(let t=0,e=this.windings.length;t<e;t++)this.windings[t]*=-1}consume(t){let e=this,n=t;for(;e.consumedBy;)e=e.consumedBy;for(;n.consumedBy;)n=n.consumedBy;const r=F.compare(e,n);if(0!==r){if(r>0){const t=e;e=n,n=t}if(e.prev===n){const t=e;e=n,n=t}for(let t=0,r=n.rings.length;t<r;t++){const r=n.rings[t],i=n.windings[t],o=e.rings.indexOf(r);-1===o?(e.rings.push(r),e.windings.push(i)):e.windings[o]+=i}n.rings=null,n.windings=null,n.consumedBy=e,n.leftSE.consumedBy=e.leftSE,n.rightSE.consumedBy=e.rightSE}}prevInResult(){return void 0!==this._prevInResult||(this.prev?this.prev.isInResult()?this._prevInResult=this.prev:this._prevInResult=this.prev.prevInResult():this._prevInResult=null),this._prevInResult}beforeState(){if(void 0!==this._beforeState)return this._beforeState;if(this.prev){const t=this.prev.consumedBy||this.prev;this._beforeState=t.afterState()}else this._beforeState={rings:[],windings:[],multiPolys:[]};return this._beforeState}afterState(){if(void 0!==this._afterState)return this._afterState;const t=this.beforeState();this._afterState={rings:t.rings.slice(0),windings:t.windings.slice(0),multiPolys:[]};const e=this._afterState.rings,n=this._afterState.windings,r=this._afterState.multiPolys;for(let t=0,r=this.rings.length;t<r;t++){const r=this.rings[t],i=this.windings[t],o=e.indexOf(r);-1===o?(e.push(r),n.push(i)):n[o]+=i}const i=[],o=[];for(let t=0,r=e.length;t<r;t++){if(0===n[t])continue;const r=e[t],s=r.poly;if(-1===o.indexOf(s))if(r.isExterior)i.push(s);else{-1===o.indexOf(s)&&o.push(s);const t=i.indexOf(r.poly);-1!==t&&i.splice(t,1)}}for(let t=0,e=i.length;t<e;t++){const e=i[t].multiPoly;-1===r.indexOf(e)&&r.push(e)}return this._afterState}isInResult(){if(this.consumedBy)return!1;if(void 0!==this._isInResult)return this._isInResult;const t=this.beforeState().multiPolys,e=this.afterState().multiPolys;switch(H.type){case"union":{const n=0===t.length,r=0===e.length;this._isInResult=n!==r;break}case"intersection":{let n,r;t.length<e.length?(n=t.length,r=e.length):(n=e.length,r=t.length),this._isInResult=r===H.numMultiPolys&&n<r;break}case"xor":{const n=Math.abs(t.length-e.length);this._isInResult=n%2==1;break}case"difference":{const n=t=>1===t.length&&t[0].isSubject;this._isInResult=n(t)!==n(e);break}default:throw new Error(`Unrecognized operation type found ${H.type}`)}return this._isInResult}}class j{constructor(t,e,n){if(!Array.isArray(t)||0===t.length)throw new Error("Input geometry is not a valid Polygon or MultiPolygon");if(this.poly=e,this.isExterior=n,this.segments=[],"number"!=typeof t[0][0]||"number"!=typeof t[0][1])throw new Error("Input geometry is not a valid Polygon or MultiPolygon");const r=b.round(t[0][0],t[0][1]);this.bbox={ll:{x:r.x,y:r.y},ur:{x:r.x,y:r.y}};let i=r;for(let e=1,n=t.length;e<n;e++){if("number"!=typeof t[e][0]||"number"!=typeof t[e][1])throw new Error("Input geometry is not a valid Polygon or MultiPolygon");let n=b.round(t[e][0],t[e][1]);n.x===i.x&&n.y===i.y||(this.segments.push(F.fromRing(i,n,this)),n.x<this.bbox.ll.x&&(this.bbox.ll.x=n.x),n.y<this.bbox.ll.y&&(this.bbox.ll.y=n.y),n.x>this.bbox.ur.x&&(this.bbox.ur.x=n.x),n.y>this.bbox.ur.y&&(this.bbox.ur.y=n.y),i=n)}r.x===i.x&&r.y===i.y||this.segments.push(F.fromRing(i,r,this))}getSweepEvents(){const t=[];for(let e=0,n=this.segments.length;e<n;e++){const n=this.segments[e];t.push(n.leftSE),t.push(n.rightSE)}return t}}class U{constructor(t,e){if(!Array.isArray(t))throw new Error("Input geometry is not a valid Polygon or MultiPolygon");this.exteriorRing=new j(t[0],this,!0),this.bbox={ll:{x:this.exteriorRing.bbox.ll.x,y:this.exteriorRing.bbox.ll.y},ur:{x:this.exteriorRing.bbox.ur.x,y:this.exteriorRing.bbox.ur.y}},this.interiorRings=[];for(let e=1,n=t.length;e<n;e++){const n=new j(t[e],this,!1);n.bbox.ll.x<this.bbox.ll.x&&(this.bbox.ll.x=n.bbox.ll.x),n.bbox.ll.y<this.bbox.ll.y&&(this.bbox.ll.y=n.bbox.ll.y),n.bbox.ur.x>this.bbox.ur.x&&(this.bbox.ur.x=n.bbox.ur.x),n.bbox.ur.y>this.bbox.ur.y&&(this.bbox.ur.y=n.bbox.ur.y),this.interiorRings.push(n)}this.multiPoly=e}getSweepEvents(){const t=this.exteriorRing.getSweepEvents();for(let e=0,n=this.interiorRings.length;e<n;e++){const n=this.interiorRings[e].getSweepEvents();for(let e=0,r=n.length;e<r;e++)t.push(n[e])}return t}}class Y{constructor(t,e){if(!Array.isArray(t))throw new Error("Input geometry is not a valid Polygon or MultiPolygon");try{"number"==typeof t[0][0][0]&&(t=[t])}catch(t){}this.polys=[],this.bbox={ll:{x:Number.POSITIVE_INFINITY,y:Number.POSITIVE_INFINITY},ur:{x:Number.NEGATIVE_INFINITY,y:Number.NEGATIVE_INFINITY}};for(let e=0,n=t.length;e<n;e++){const n=new U(t[e],this);n.bbox.ll.x<this.bbox.ll.x&&(this.bbox.ll.x=n.bbox.ll.x),n.bbox.ll.y<this.bbox.ll.y&&(this.bbox.ll.y=n.bbox.ll.y),n.bbox.ur.x>this.bbox.ur.x&&(this.bbox.ur.x=n.bbox.ur.x),n.bbox.ur.y>this.bbox.ur.y&&(this.bbox.ur.y=n.bbox.ur.y),this.polys.push(n)}this.isSubject=e}getSweepEvents(){const t=[];for(let e=0,n=this.polys.length;e<n;e++){const n=this.polys[e].getSweepEvents();for(let e=0,r=n.length;e<r;e++)t.push(n[e])}return t}}class V{static factory(t){const e=[];for(let n=0,r=t.length;n<r;n++){const r=t[n];if(!r.isInResult()||r.ringOut)continue;let i=null,o=r.leftSE,s=r.rightSE;const l=[o],h=o.point,u=[];for(;i=o,o=s,l.push(o),o.point!==h;)for(;;){const t=o.getAvailableLinkedEvents();if(0===t.length){const t=l[0].point,e=l[l.length-1].point;throw new Error(`Unable to complete output ring starting at [${t.x}, ${t.y}]. Last matching segment found ends at [${e.x}, ${e.y}].`)}if(1===t.length){s=t[0].otherSE;break}let n=null;for(let t=0,e=u.length;t<e;t++)if(u[t].point===o.point){n=t;break}if(null!==n){const t=u.splice(n)[0],r=l.splice(t.index);r.unshift(r[0].otherSE),e.push(new V(r.reverse()));continue}u.push({index:l.length,point:o.point});const r=o.getLeftmostComparator(i);s=t.sort(r)[0].otherSE;break}e.push(new V(l))}return e}constructor(t){this.events=t;for(let e=0,n=t.length;e<n;e++)t[e].segment.ringOut=this;this.poly=null}getGeom(){let t=this.events[0].point;const e=[t];for(let n=1,r=this.events.length-1;n<r;n++){const r=this.events[n].point,i=this.events[n+1].point;0!==$(r,t,i)&&(e.push(r),t=r)}if(1===e.length)return null;const n=e[0],r=e[1];0===$(n,t,r)&&e.shift(),e.push(e[0]);const i=this.isExteriorRing()?1:-1,o=this.isExteriorRing()?0:e.length-1,s=this.isExteriorRing()?e.length:-1,l=[];for(let t=o;t!=s;t+=i)l.push([e[t].x,e[t].y]);return l}isExteriorRing(){if(void 0===this._isExteriorRing){const t=this.enclosingRing();this._isExteriorRing=!t||!t.isExteriorRing()}return this._isExteriorRing}enclosingRing(){return void 0===this._enclosingRing&&(this._enclosingRing=this._calcEnclosingRing()),this._enclosingRing}_calcEnclosingRing(){let t=this.events[0];for(let e=1,n=this.events.length;e<n;e++){const n=this.events[e];q.compare(t,n)>0&&(t=n)}let e=t.segment.prevInResult(),n=e?e.prevInResult():null;for(;;){if(!e)return null;if(!n)return e.ringOut;if(n.ringOut!==e.ringOut)return n.ringOut.enclosingRing()!==e.ringOut?e.ringOut:e.ringOut.enclosingRing();e=n.prevInResult(),n=e?e.prevInResult():null}}}class X{constructor(t){this.exteriorRing=t,t.poly=this,this.interiorRings=[]}addInterior(t){this.interiorRings.push(t),t.poly=this}getGeom(){const t=[this.exteriorRing.getGeom()];if(null===t[0])return null;for(let e=0,n=this.interiorRings.length;e<n;e++){const n=this.interiorRings[e].getGeom();null!==n&&t.push(n)}return t}}class Q{constructor(t){this.rings=t,this.polys=this._composePolys(t)}getGeom(){const t=[];for(let e=0,n=this.polys.length;e<n;e++){const n=this.polys[e].getGeom();null!==n&&t.push(n)}return t}_composePolys(t){const e=[];for(let n=0,r=t.length;n<r;n++){const r=t[n];if(!r.poly)if(r.isExteriorRing())e.push(new X(r));else{const t=r.enclosingRing();t.poly||e.push(new X(t)),t.poly.addInterior(r)}}return e}}class W{constructor(t){let e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:F.compare;this.queue=t,this.tree=new l(e),this.segments=[]}process(t){const e=t.segment,n=[];if(t.consumedBy)return t.isLeft?this.queue.remove(t.otherSE):this.tree.remove(e),n;const r=t.isLeft?this.tree.add(e):this.tree.find(e);if(!r)throw new Error(`Unable to find segment #${e.id} [${e.leftSE.point.x}, ${e.leftSE.point.y}] -> [${e.rightSE.point.x}, ${e.rightSE.point.y}] in SweepLine tree.`);let i,o,s=r,l=r;for(;void 0===i;)s=this.tree.prev(s),null===s?i=null:void 0===s.key.consumedBy&&(i=s.key);for(;void 0===o;)l=this.tree.next(l),null===l?o=null:void 0===l.key.consumedBy&&(o=l.key);if(t.isLeft){let r=null;if(i){const t=i.getIntersection(e);if(null!==t&&(e.isAnEndpoint(t)||(r=t),!i.isAnEndpoint(t))){const e=this._splitSafely(i,t);for(let t=0,r=e.length;t<r;t++)n.push(e[t])}}let s=null;if(o){const t=o.getIntersection(e);if(null!==t&&(e.isAnEndpoint(t)||(s=t),!o.isAnEndpoint(t))){const e=this._splitSafely(o,t);for(let t=0,r=e.length;t<r;t++)n.push(e[t])}}if(null!==r||null!==s){let t=null;if(null===r)t=s;else if(null===s)t=r;else{t=q.comparePoints(r,s)<=0?r:s}this.queue.remove(e.rightSE),n.push(e.rightSE);const i=e.split(t);for(let t=0,e=i.length;t<e;t++)n.push(i[t])}n.length>0?(this.tree.remove(e),n.push(t)):(this.segments.push(e),e.prev=i)}else{if(i&&o){const t=i.getIntersection(o);if(null!==t){if(!i.isAnEndpoint(t)){const e=this._splitSafely(i,t);for(let t=0,r=e.length;t<r;t++)n.push(e[t])}if(!o.isAnEndpoint(t)){const e=this._splitSafely(o,t);for(let t=0,r=e.length;t<r;t++)n.push(e[t])}}}this.tree.remove(e)}return n}_splitSafely(t,e){this.tree.remove(t);const n=t.rightSE;this.queue.remove(n);const r=t.split(e);return r.push(n),void 0===t.consumedBy&&this.tree.add(t),r}}const Z="undefined"!=typeof process&&process.env.POLYGON_CLIPPING_MAX_QUEUE_SIZE||1e6,D="undefined"!=typeof process&&process.env.POLYGON_CLIPPING_MAX_SWEEPLINE_SEGMENTS||1e6;const H=new class{run(t,e,n){H.type=t,b.reset();const r=[new Y(e,!0)];for(let t=0,e=n.length;t<e;t++)r.push(new Y(n[t],!1));if(H.numMultiPolys=r.length,"difference"===H.type){const t=r[0];let e=1;for(;e<r.length;)null!==p(r[e].bbox,t.bbox)?e++:r.splice(e,1)}if("intersection"===H.type)for(let t=0,e=r.length;t<e;t++){const e=r[t];for(let n=t+1,i=r.length;n<i;n++)if(null===p(e.bbox,r[n].bbox))return[]}const i=new l(q.compare);for(let t=0,e=r.length;t<e;t++){const e=r[t].getSweepEvents();for(let t=0,n=e.length;t<n;t++)if(i.insert(e[t]),i.size>Z)throw new Error("Infinite loop when putting segment endpoints in a priority queue (queue size too big).")}const o=new W(i);let s=i.size,h=i.pop();for(;h;){const t=h.key;if(i.size===s){const e=t.segment;throw new Error(`Unable to pop() ${t.isLeft?"left":"right"} SweepEvent [${t.point.x}, ${t.point.y}] from segment #${e.id} [${e.leftSE.point.x}, ${e.leftSE.point.y}] -> [${e.rightSE.point.x}, ${e.rightSE.point.y}] from queue.`)}if(i.size>Z)throw new Error("Infinite loop when passing sweep line over endpoints (queue size too big).");if(o.segments.length>D)throw new Error("Infinite loop when passing sweep line over endpoints (too many sweep line segments).");const e=o.process(t);for(let t=0,n=e.length;t<n;t++){const n=e[t];void 0===n.consumedBy&&i.insert(n)}s=i.size,h=i.pop()}b.reset();const u=V.factory(o.segments);return new Q(u).getGeom()}};var J={union:function(t){for(var e=arguments.length,n=new Array(e>1?e-1:0),r=1;r<e;r++)n[r-1]=arguments[r];return H.run("union",t,n)},intersection:function(t){for(var e=arguments.length,n=new Array(e>1?e-1:0),r=1;r<e;r++)n[r-1]=arguments[r];return H.run("intersection",t,n)},xor:function(t){for(var e=arguments.length,n=new Array(e>1?e-1:0),r=1;r<e;r++)n[r-1]=arguments[r];return H.run("xor",t,n)},difference:function(t){for(var e=arguments.length,n=new Array(e>1?e-1:0),r=1;r<e;r++)n[r-1]=arguments[r];return H.run("difference",t,n)}};return J}));
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