Merge branch 'develop'

simpleExample/coming_test.js

@@ -0,0 +1,80 @@
+import Shape from 'clipper-js';
+import comb from '../src/sliceActions/helpers/comb.js';
+
+const canvas = document.createElement('canvas');
+document.body.appendChild(canvas);
+canvas.width = 720;
+canvas.height = 480;
+const context = canvas.getContext('2d');
+
+const outline = new Shape([[
+  { x: 100, y: 100 },
+  { x: 400, y: 100 },
+  { x: 400, y: 150 },
+  { x: 200, y: 150 },
+  { x: 200, y: 200 },
+  { x: 400, y: 200 },
+  { x: 400, y: 250 },
+  { x: 200, y: 250 },
+  { x: 200, y: 300 },
+  { x: 400, y: 300 },
+  { x: 400, y: 400 },
+  { x: 100, y: 400 }
+], [
+  { x: 130, y: 310 },
+  { x: 130, y: 370 },
+  { x: 360, y: 370 },
+  { x: 360, y: 360 },
+  { x: 150, y: 360 },
+  { x: 150, y: 350 },
+  { x: 360, y: 350 },
+  { x: 360, y: 340 },
+  { x: 150, y: 340 },
+  { x: 150, y: 330 },
+  { x: 360, y: 330 },
+  { x: 360, y: 310 }
+]], true, true, false);
+
+const start = { x: 380, y: 120 };
+const end = { x: 200, y: 380 };
+
+let combPath = comb(outline, start, end);
+
+canvas.onmousemove = (event) => {
+  start.x = event.x;
+  start.y = event.y;
+
+  combPath = comb(outline, start, end);
+  draw();
+};
+
+draw();
+
+function draw() {
+  context.clearRect(0, 0, canvas.width, canvas.height);
+
+  context.strokeStyle = 'black';
+  for (const path of outline.mapToLower()) {
+    context.beginPath();
+    for (const point of path) {
+      context.lineTo(point.x, point.y);
+    }
+    context.closePath();
+    context.stroke();
+  }
+
+  context.strokeStyle = 'red';
+  context.beginPath();
+  for (const point of combPath) {
+    context.lineTo(point.x, point.y);
+  }
+  context.stroke();
+
+  context.beginPath();
+  context.arc(start.x, start.y, 3, 0, Math.PI * 2.0, false);
+  context.stroke();
+
+  context.beginPath();
+  context.arc(end.x, end.y, 3, 0, Math.PI * 2.0, false);
+  context.stroke();
+}

simpleExample/index.js

@@ -1,5 +1,7 @@
 import * as THREE from 'three';
 import { defaultSettings, sliceGeometry } from 'doodle3d-slicer';
+import fileURL from '!url-loader!./models/combingtest.json';
+import fileSaver from 'file-saver';
 
 const settings = {
   ...defaultSettings.base,
@@ -8,14 +10,20 @@ const settings = {
   ...defaultSettings.quality.high
 };
 
-const geometry = new THREE.TorusGeometry(20, 10, 30, 30).clone();
+const jsonLoader = new THREE.JSONLoader();
-geometry.mergeVertices();
+jsonLoader.load(fileURL, geometry => {
+  geometry.applyMatrix(new THREE.Matrix4().makeRotationX(Math.PI / -2));
+  geometry.applyMatrix(new THREE.Matrix4().setPosition(new THREE.Vector3(50, -0.0, 50)));
 
-const onProgress = ({ progress: { done, total, action } }) => {
+  const onProgress = ({ progress: { done, total, action } }) => {
     const percentage = `${(done / total * 100).toFixed()}%`
     document.write(`<p>${action}, ${percentage}</p>`);
-};
+  };
 
-sliceGeometry(settings, geometry, null, false, onProgress).then(gcode => {
+  const { filament, duration, gcode } = sliceGeometry(settings, geometry, null, true, onProgress);
-  document.body.innerHTML = gcode.replace(/(?:\r\n|\r|\n)/g, '<br />');
+  // console.log('filament: ', filament);
+  // console.log('duration: ', duration);
+  // document.body.innerHTML = gcode.replace(/(?:\r\n|\r|\n)/g, '<br />');
+  const file = new File([gcode], 'gcode.gcode', { type: 'text/plain' });
+  fileSaver.saveAs(file);
 });

simpleExample/models/Doodle.json

@@ -0,0 +1 @@
+{"vertices":[47.12482452392578,42.35624313354492,-2.593571992041396e-15,-7.293127536773682,29.7335205078125,-1.820653115308456e-15,-4.207573413848877,-19.915847778320312,1.219494014914264e-15,54.97896194458008,-14.586255073547363,8.931505683412107e-16,53.85694122314453,-42.07573699951172,2.576395944332666e-15,-35.624122619628906,-25.245441436767578,1.5458375198830296e-15,-38.99018096923828,51.6129035949707,-3.1603789970181283e-15,47.12482452392578,61.71107864379883,-3.7787139115382e-15,47.12482452392578,42.35624313354492,19.999999999999996,-7.293127536773682,29.7335205078125,19.999999999999996,-4.207573413848877,-19.915847778320312,20,54.97896194458008,-14.586255073547362,20,53.85694122314453,-42.07573699951172,20.000000000000004,-35.624122619628906,-25.245441436767578,20,-38.99018096923828,51.6129035949707,19.999999999999996,47.12482452392578,61.71107864379883,19.999999999999996],"normals":[0,-6.123234262925839e-17,-1,0,6.123234262925839e-17,1,0.22595957126202507,-0.9741366804278966,5.964867098368936e-17,0.22595959003447755,-0.9741366760734609,5.964867071705706e-17,0.9980744575480833,0.062027229424660574,-3.798072564474434e-18,0.9980744575147102,0.06202722996166134,-3.798072597356249e-18,-0.08968451372047671,0.995970224453885,-6.098559003229967e-17,-0.0896845139633491,0.9959702244320148,-6.098559003096051e-17,0.9991680515439634,-0.04078240765133586,2.4972023585526864e-18,0.9991680513997995,-0.040782411183346925,2.4972025748259983e-18,-0.18484654771165182,-0.9827673955718536,6.017714989051966e-17,-0.1848465343760269,-0.9827673980801217,6.017715004410679e-17,-0.9990423495327988,-0.04375367230285246,2.679139853736555e-18,-0.9990423494957035,-0.04375367314986121,2.6791399056008846e-18,-0.11646581097902166,0.993194701391927,-6.081563825319445e-17,-0.11646581460851489,0.9931947009663187,-6.081563822713346e-17,1,0,0],"faces":[50,7,0,1,0,0,0,0,0,50,2,3,4,0,0,0,0,0,50,6,7,1,0,0,0,0,0,50,2,4,5,0,0,0,0,0,50,5,6,1,0,0,0,0,0,50,1,2,5,0,0,0,0,0,50,13,10,9,0,1,1,1,1,50,9,14,13,0,1,1,1,1,50,13,12,10,0,1,1,1,1,50,9,15,14,0,1,1,1,1,50,12,11,10,0,1,1,1,1,50,9,8,15,0,1,1,1,1,50,0,8,1,0,2,3,3,3,50,8,9,1,0,2,3,3,3,50,1,9,2,0,4,5,5,5,50,9,10,2,0,4,5,5,5,50,2,10,3,0,6,7,7,7,50,10,11,3,0,6,7,7,7,50,3,11,4,0,8,9,9,9,50,11,12,4,0,8,9,9,9,50,4,12,5,0,10,11,11,11,50,12,13,5,0,10,11,11,11,50,5,13,6,0,12,13,13,13,50,13,14,6,0,12,13,13,13,50,6,14,7,0,14,15,15,15,50,14,15,7,0,14,15,15,15,50,7,15,0,0,16,16,16,16,50,15,8,0,0,16,16,16,16]}

simpleExample/package-lock.json

@@ -886,8 +886,7 @@
     "big.js": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-3.1.3.tgz",
-      "integrity": "sha1-TK2iGTZS6zyp7I5VyQFWacmAaXg=",
+      "integrity": "sha1-TK2iGTZS6zyp7I5VyQFWacmAaXg="
-      "dev": true
     },
     "binary-extensions": {
       "version": "1.8.0",
@@ -1589,8 +1588,7 @@
     "emojis-list": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/emojis-list/-/emojis-list-2.1.0.tgz",
-      "integrity": "sha1-TapNnbAPmBmIDHn6RXrlsJof04k=",
+      "integrity": "sha1-TapNnbAPmBmIDHn6RXrlsJof04k="
-      "dev": true
     },
     "encodeurl": {
       "version": "1.0.1",
@@ -1897,6 +1895,11 @@
         "websocket-driver": "0.6.5"
       }
     },
+    "file-saver": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/file-saver/-/file-saver-1.3.3.tgz",
+      "integrity": "sha1-zdTETTqiZOrC9o7BZbx5HDSvEjI="
+    },
     "filename-regex": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/filename-regex/-/filename-regex-2.0.1.tgz",
@@ -3508,8 +3511,7 @@
     "json5": {
       "version": "0.5.1",
       "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
-      "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=",
+      "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE="
-      "dev": true
     },
     "jsonify": {
       "version": "0.0.0",
@@ -3564,7 +3566,6 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-1.1.0.tgz",
       "integrity": "sha1-yYrvSIvM7aL/teLeZG1qdUQp9c0=",
-      "dev": true,
       "requires": {
         "big.js": "3.1.3",
         "emojis-list": "2.1.0",
@@ -3721,8 +3722,7 @@
     "mime": {
       "version": "1.3.4",
       "resolved": "https://registry.npmjs.org/mime/-/mime-1.3.4.tgz",
-      "integrity": "sha1-EV+eO2s9rylZmDyzjxSaLUDrXVM=",
+      "integrity": "sha1-EV+eO2s9rylZmDyzjxSaLUDrXVM="
-      "dev": true
     },
     "mime-db": {
       "version": "1.27.0",
@@ -5065,6 +5065,15 @@
         }
       }
     },
+    "url-loader": {
+      "version": "0.5.9",
+      "resolved": "https://registry.npmjs.org/url-loader/-/url-loader-0.5.9.tgz",
+      "integrity": "sha512-B7QYFyvv+fOBqBVeefsxv6koWWtjmHaMFT6KZWti4KRw8YUD/hOU+3AECvXuzyVawIBx3z7zQRejXCDSO5kk1Q==",
+      "requires": {
+        "loader-utils": "1.1.0",
+        "mime": "1.3.4"
+      }
+    },
     "url-parse": {
       "version": "1.1.9",
       "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.1.9.tgz",

simpleExample/package.json

@@ -11,7 +11,9 @@
   "license": "ISC",
   "dependencies": {
     "babel-polyfill": "^6.23.0",
-    "three": "^0.83.0"
+    "file-saver": "^1.3.3",
+    "three": "^0.83.0",
+    "url-loader": "^0.5.9"
   },
   "devDependencies": {
     "babel-core": "^6.25.0",

src/settings/default.yml

@@ -8,6 +8,7 @@ filamentThickness: 2.85
 temperature: 210
 bedTemperature: 70
 layerHeight: 0.15
+combing: true
 thickness:
   top: 1.2
   bottom: 1.2

src/sliceActions/helpers/GCode.js

@@ -1,4 +1,5 @@
 import * as THREE from 'three';
+import { PRECISION } from '../../constants.js';
 
 const MOVE = 'G';
 const M_COMMAND = 'M';
@@ -17,6 +18,7 @@ export default class {
     this._currentValues = {};
     this._nozzlePosition = new THREE.Vector2(0, 0);
     this._extruder = 0.0;
+    this._duration = 0.0;
     this._isRetracted = false;
     this._isFanOn = false;
   }
@@ -62,35 +64,37 @@ export default class {
   }
 
   moveTo(x, y, z, { speed }) {
-    speed *= 60;
+    const newNozzlePosition = new THREE.Vector2(x, y).multiplyScalar(PRECISION);
+    const lineLength = this._nozzlePosition.distanceTo(newNozzlePosition);
+
+    this._duration += lineLength / speed;
 
     this._addGCode({
       [MOVE]: 0,
-      [POSITION_X]: x.toFixed(3),
+      [POSITION_X]: newNozzlePosition.x.toFixed(3),
-      [POSITION_Y]: y.toFixed(3),
+      [POSITION_Y]: newNozzlePosition.y.toFixed(3),
       [POSITION_Z]: z.toFixed(3),
-      [SPEED]: speed.toFixed(3)
+      [SPEED]: (speed * 60).toFixed(3)
     });
 
-    this._nozzlePosition.set(x, y);
+    this._nozzlePosition.copy(newNozzlePosition);
 
     return this;
   }
 
   lineTo(x, y, z, { speed, flowRate }) {
-    const newNozzlePosition = new THREE.Vector2(x, y);
+    const newNozzlePosition = new THREE.Vector2(x, y).multiplyScalar(PRECISION);
-
-    speed *= 60;
-
     const lineLength = this._nozzlePosition.distanceTo(newNozzlePosition);
+
     this._extruder += this._nozzleToFilamentRatio * lineLength * flowRate;
+    this._duration += lineLength / speed;
 
     this._addGCode({
       [MOVE]: 1,
-      [POSITION_X]: x.toFixed(3),
+      [POSITION_X]: newNozzlePosition.x.toFixed(3),
-      [POSITION_Y]: y.toFixed(3),
+      [POSITION_Y]: newNozzlePosition.y.toFixed(3),
       [POSITION_Z]: z.toFixed(3),
-      [SPEED]: speed.toFixed(3),
+      [SPEED]: (speed * 60).toFixed(3),
       [EXTRUDER]: this._extruder.toFixed(3)
     });
 
@@ -99,17 +103,17 @@ export default class {
     return this;
   }
 
-  unRetract({ enabled, speed, minDistance }) {
+  unRetract({ enabled, speed, minDistance, amount }) {
     if (this._isRetracted && enabled) {
       this._isRetracted = false;
 
-      speed *= 60;
-
       if (this._extruder > minDistance) {
+        this._duration += amount / speed;
+
         this._addGCode({
           [MOVE]: 0,
           [EXTRUDER]: this._extruder.toFixed(3),
-          [SPEED]: speed.toFixed(3)
+          [SPEED]: (speed * 60).toFixed(3)
         });
       }
     }
@@ -121,13 +125,13 @@ export default class {
     if (!this._isRetracted && enabled) {
       this._isRetracted = true;
 
-      speed *= 60;
-
       if (this._extruder > minDistance) {
+        this._duration += amount / speed;
+
         this._addGCode({
           [MOVE]: 0,
           [EXTRUDER]: (this._extruder - amount).toFixed(3),
-          [SPEED]: speed.toFixed(3)
+          [SPEED]: (speed * 60).toFixed(3)
         });
       }
     }
@@ -136,6 +140,10 @@ export default class {
   }
 
   getGCode() {
-    return this._gcode;
+    return {
+      gcode: this._gcode,
+      duration: this._duration,
+      filament: this._extruder
+    };
   }
 }

src/sliceActions/helpers/VectorUtils.js

@@ -0,0 +1,27 @@
+export const subtract = (a, b) => ({
+  x: a.x - b.x,
+  y: a.y - b.y
+});
+export const add = (a, b) => ({
+  x: a.x + b.x,
+  y: a.y + b.y
+});
+export const scale = (a, factor) => ({
+  x: a.x * factor,
+  y: a.y * factor
+});
+export const normal = (a) => ({
+  x: -a.y,
+  y: a.x
+});
+export const dot = (a, b) => a.x * b.x + a.y * b.y;
+export const length = (a) => Math.sqrt(a.x * a.x + a.y * a.y);
+export const distanceTo = (a, b) => length(subtract(a, b));
+export const normalize = (a) => {
+  const l = length(a);
+
+  return {
+    x: a.x / l,
+    y: a.y / l
+  };
+}

src/sliceActions/helpers/comb.js

@@ -0,0 +1,131 @@
+import Shape from 'clipper-js';
+import { subtract, add, scale, normalize, dot, length, distanceTo } from './VectorUtils.js';
+import { PRECISION } from '../../constants.js';
+
+const TOLERANCE = 5 / PRECISION;
+
+export default function comb(outline, start, end) {
+  if (distanceTo(start, end) < TOLERANCE) {
+    return [start, end];
+  }
+
+  let combPath = new Shape([[start, end]], false, true, false);
+
+  for (let i = 0; i < outline.paths.length; i ++) {
+    let outlinePart = new Shape([outline.paths[i]], true, false, false, true);
+
+    let snappedCombPaths = outlinePart.orientation(0) ? combPath.intersect(outlinePart) : combPath.difference(outlinePart);
+
+    snappedCombPaths = snappedCombPaths.mapToLower();
+    outlinePart = outlinePart.mapToLower()[0];
+
+    if (distanceTo(start, outlinePart[outlinePart.length - 1]) < distanceTo(start, outlinePart[0])) {
+      outlinePart = outlinePart.reverse();
+    }
+
+    const distanceMap = new WeakMap();
+
+    for (let i = 0; i < snappedCombPaths.length; i ++) {
+      const snappedCombPath = snappedCombPaths[i];
+
+      const distanceStart = distanceTo(start, snappedCombPath[0]);
+      const distanceEnd = distanceTo(start, snappedCombPath[snappedCombPath.length - 1]);
+
+      if (distanceStart < distanceEnd) {
+        distanceMap.set(snappedCombPath, distanceStart);
+      } else {
+        snappedCombPath.reverse();
+        distanceMap.set(snappedCombPath, distanceEnd);
+      }
+    }
+    snappedCombPaths.sort((a, b) => distanceMap.get(a) - distanceMap.get(b));
+
+    const firstPath = snappedCombPaths[0];
+    const lastPath = snappedCombPaths[snappedCombPaths.length - 1];
+
+    if (snappedCombPaths.length === 0) {
+      snappedCombPaths.push([start], [end]);
+    } else if (distanceTo(firstPath[0], start) > 1.0) {
+      snappedCombPaths.unshift([start]);
+    } else if (distanceTo(lastPath[lastPath.length - 1], end) > 1.0) {
+      snappedCombPaths.push([end]);
+    }
+
+    if (snappedCombPaths.length === 1) {
+      continue;
+    }
+
+    const startPath = snappedCombPaths[0];
+    const startPoint = startPath[startPath.length - 1];
+
+    const endPath = snappedCombPaths[snappedCombPaths.length - 1];
+    const endPoint = endPath[0];
+
+    const lineIndexStart = findClosestLineOnPath(outlinePart, startPoint);
+    const lineIndexEnd = findClosestLineOnPath(outlinePart, endPoint);
+
+    const path = [];
+    if (lineIndexEnd === lineIndexStart) {
+      continue;
+    } else if (lineIndexEnd > lineIndexStart) {
+      if (lineIndexStart + outlinePart.length - lineIndexEnd < lineIndexEnd - lineIndexStart) {
+        for (let i = lineIndexStart + outlinePart.length; i > lineIndexEnd; i --) {
+          path.push(outlinePart[i % outlinePart.length]);
+        }
+      } else {
+        for (let i = lineIndexStart; i < lineIndexEnd; i ++) {
+          path.push(outlinePart[i + 1]);
+        }
+      }
+    } else {
+      if (lineIndexEnd + outlinePart.length - lineIndexStart < lineIndexStart - lineIndexEnd) {
+        for (let i = lineIndexStart; i < lineIndexEnd + outlinePart.length; i ++) {
+          path.push(outlinePart[(i + 1) % outlinePart.length]);
+        }
+      } else {
+        for (let i = lineIndexStart; i > lineIndexEnd; i --) {
+          path.push(outlinePart[i]);
+        }
+      }
+    }
+
+    combPath = new Shape([[...startPath, ...path, ...endPath]], false, true, false, true);
+  }
+
+  return combPath.mapToLower()[0];
+}
+
+function findClosestLineOnPath(path, point) {
+  let distance = Infinity;
+  let lineIndex;
+
+  for (let i = 0; i < path.length; i ++) {
+    const pointA = path[i];
+    const pointB = path[(i + 1) % path.length];
+
+    const tempClosestPoint = findClosestPointOnLine(pointA, pointB, point);
+    const tempDistance = distanceTo(tempClosestPoint, point);
+
+    if (tempDistance < distance) {
+      distance = tempDistance;
+      lineIndex = i;
+    }
+  }
+
+  return lineIndex;
+}
+
+function findClosestPointOnLine(a, b, c) {
+  const b_ = subtract(b, a);
+  const c_ = subtract(c, a);
+
+  const lambda = dot(normalize(b_), c_) / length(b_);
+
+  if (lambda >= 1) {
+    return b;
+  } else if (lambda > 0) {
+    return add(a, scale(b_, lambda));
+  } else {
+    return a;
+  }
+}

src/sliceActions/slice.js

@@ -11,7 +11,7 @@ import shapesToSlices from './shapesToSlices.js';
 import slicesToGCode from './slicesToGCode.js';
 import detectOpenClosed from './detectOpenClosed.js';
 import applyPrecision from './applyPrecision.js';
-import removePrecision from './removePrecision.js';
+// import removePrecision from './removePrecision.js';
 
 export default function(settings, geometry, onProgress) {
   const totalStages = 12;
@@ -65,7 +65,7 @@ export default function(settings, geometry, onProgress) {
   updateProgress('Optimizing paths');
   optimizePaths(slices, settings);
 
-  removePrecision(slices);
+  // removePrecision(slices);
 
   updateProgress('Constructing gcode');
   const gcode = slicesToGCode(slices, settings);

src/sliceActions/slicesToGCode.js

@@ -1,4 +1,6 @@
 import GCode from './helpers/GCode.js';
+import comb from './helpers/comb.js';
+import { PRECISION } from '../constants.js';
 
 const PROFILE_TYPES = ['support', 'innerShell', 'outerShell', 'innerInfill', 'outerInfill', 'brim'];
 
@@ -9,7 +11,8 @@ export default function slicesToGCode(slices, settings) {
     nozzleDiameter,
     travelSpeed,
     retraction,
-    travel
+    travel,
+    combing
   } = settings;
 
   const filamentSurfaceArea = Math.pow((filamentThickness / 2), 2) * Math.PI;
@@ -42,11 +45,12 @@ export default function slicesToGCode(slices, settings) {
     }, {});
 
     if (typeof slice.brim !== 'undefined') {
-      pathToGCode(gcode, slice.brim, true, true, z, profiles.brim);
+      pathToGCode(null, false, gcode, slice.brim, true, true, z, profiles.brim);
     }
 
     for (let i = 0; i < slice.parts.length; i ++) {
       const part = slice.parts[i];
+      const outline = part.shell[0];
 
       if (part.closed) {
         for (let i = 0; i < part.shell.length; i ++) {
@@ -55,26 +59,26 @@ export default function slicesToGCode(slices, settings) {
 
           const unRetract = isOuterShell;
           const profile = isOuterShell ? profiles.outerShell : profiles.innerShell;
-          pathToGCode(gcode, shell, false, unRetract, z, profile);
+          pathToGCode(outline, combing && true, gcode, shell, false, unRetract, z, profile);
         }
 
-        pathToGCode(gcode, part.outerFill, false, false, z, profiles.outerInfill);
+        pathToGCode(outline, combing && true, gcode, part.outerFill, false, false, z, profiles.outerInfill);
-        pathToGCode(gcode, part.innerFill, true, false, z, profiles.innerInfill);
+        pathToGCode(outline, combing && true, gcode, part.innerFill, true, false, z, profiles.innerInfill);
       } else {
         const retract = !(slice.parts.length === 1 && typeof slice.support === 'undefined');
-        pathToGCode(gcode, part.shape, retract, retract, z, profiles.outerShell);
+        pathToGCode(null, false, gcode, part.shape, retract, retract, z, profiles.outerShell);
       }
     }
 
     if (typeof slice.support !== 'undefined') {
-      pathToGCode(gcode, slice.support, true, true, z, profiles.support);
+      pathToGCode(null, false, gcode, slice.support, true, true, z, profiles.support);
     }
   }
 
   return gcode.getGCode();
 }
 
-function pathToGCode(gcode, shape, retract, unRetract, z, { lineProfile, travelProfile, retractionProfile }) {
+function pathToGCode(outline, combing, gcode, shape, retract, unRetract, z, { lineProfile, travelProfile, retractionProfile }) {
   const { closed } = shape;
   const paths = shape.mapToLower();
 
@@ -86,9 +90,15 @@ function pathToGCode(gcode, shape, retract, unRetract, z, { lineProfile, travelP
       const point = line[i % line.length];
 
       if (i === 0) {
-        // TODO
+        if (combing) {
-        // moveTo should impliment combing
+          const combPath = comb(outline, gcode._nozzlePosition.divideScalar(PRECISION), point);
+          for (let i = 0; i < combPath.length; i ++) {
+            const combPoint = combPath[i];
+            gcode.moveTo(combPoint.x, combPoint.y, z, travelProfile);
+          }
+        } else {
           gcode.moveTo(point.x, point.y, z, travelProfile);
+        }
 
         if (unRetract) {
           gcode.unRetract(retractionProfile);