diff --git a/src/actions/CutShapeAction.js b/src/actions/CutShapeAction.js
index 534b941..59688e6 100644
--- a/src/actions/CutShapeAction.js
+++ b/src/actions/CutShapeAction.js
@@ -4,27 +4,25 @@ import Action from "./Action";
 import {
   addPolygonDifferenceToShapes,
   addPolygonIntersectionToShapes,
+  shapeToGeometry,
 } from "../helpers/actions";
 
 class CutShapeAction extends Action {
   constructor(shapes) {
     super();
     this.update = (shapesById) => {
-      const actionGeom = shapes.map((actionShape) => [
-        actionShape.data.points.map(({ x, y }) => [x, y]),
-      ]);
+      let actionGeom = shapes.map(shapeToGeometry);
       let cutShapes = {};
       for (let shape of Object.values(shapesById)) {
-        const shapePoints = shape.data.points.map(({ x, y }) => [x, y]);
-        const shapeHoles = shape.data.holes.map((hole) =>
-          hole.map(({ x, y }) => [x, y])
-        );
-        let shapeGeom = [[shapePoints, ...shapeHoles]];
+        const shapeGeom = shapeToGeometry(shape);
         try {
-          const difference = polygonClipping.difference(shapeGeom, actionGeom);
+          const difference = polygonClipping.difference(
+            shapeGeom,
+            ...actionGeom
+          );
           const intersection = polygonClipping.intersection(
             shapeGeom,
-            actionGeom
+            ...actionGeom
           );
           addPolygonDifferenceToShapes(shape, difference, cutShapes);
           addPolygonIntersectionToShapes(shape, intersection, cutShapes);
diff --git a/src/actions/SubtractShapeAction.js b/src/actions/SubtractShapeAction.js
index 712bbff..13f915a 100644
--- a/src/actions/SubtractShapeAction.js
+++ b/src/actions/SubtractShapeAction.js
@@ -1,24 +1,24 @@
 import polygonClipping from "polygon-clipping";
 
 import Action from "./Action";
-import { addPolygonDifferenceToShapes } from "../helpers/actions";
+import {
+  addPolygonDifferenceToShapes,
+  shapeToGeometry,
+} from "../helpers/actions";
 
 class SubtractShapeAction extends Action {
   constructor(shapes) {
     super();
     this.update = (shapesById) => {
-      const actionGeom = shapes.map((actionShape) => [
-        actionShape.data.points.map(({ x, y }) => [x, y]),
-      ]);
+      const actionGeom = shapes.map(shapeToGeometry);
       let subtractedShapes = {};
       for (let shape of Object.values(shapesById)) {
-        const shapePoints = shape.data.points.map(({ x, y }) => [x, y]);
-        const shapeHoles = shape.data.holes.map((hole) =>
-          hole.map(({ x, y }) => [x, y])
-        );
-        let shapeGeom = [[shapePoints, ...shapeHoles]];
+        const shapeGeom = shapeToGeometry(shape);
         try {
-          const difference = polygonClipping.difference(shapeGeom, actionGeom);
+          const difference = polygonClipping.difference(
+            shapeGeom,
+            ...actionGeom
+          );
           addPolygonDifferenceToShapes(shape, difference, subtractedShapes);
         } catch {
           console.error("Unable to find difference for shapes");
diff --git a/src/helpers/actions.js b/src/helpers/actions.js
index 44c51b7..90d882b 100644
--- a/src/helpers/actions.js
+++ b/src/helpers/actions.js
@@ -42,3 +42,11 @@ export function addPolygonIntersectionToShapes(shape, intersection, shapes) {
     };
   }
 }
+
+export function shapeToGeometry(shape) {
+  const shapePoints = shape.data.points.map(({ x, y }) => [x, y]);
+  const shapeHoles = shape.data.holes.map((hole) =>
+    hole.map(({ x, y }) => [x, y])
+  );
+  return [[shapePoints, ...shapeHoles]];
+}