Merge 37412cd68a into dff69e9191

packages/common/src/utils.ts

@@ -1,9 +1,10 @@
-import { average } from "@excalidraw/math";
+import { average, pointFrom, type GlobalPoint } from "@excalidraw/math";
 
 import type {
   ExcalidrawBindableElement,
   FontFamilyValues,
   FontString,
+  ExcalidrawElement,
 } from "@excalidraw/element/types";
 
 import type {
@@ -1201,3 +1202,17 @@ export const escapeDoubleQuotes = (str: string) => {
 
 export const castArray = <T>(value: T | T[]): T[] =>
   Array.isArray(value) ? value : [value];
+
+export const elementCenterPoint = (
+  element: ExcalidrawElement,
+  xOffset: number = 0,
+  yOffset: number = 0,
+) => {
+  const { x, y, width, height } = element;
+
+  const centerXPoint = x + width / 2 + xOffset;
+
+  const centerYPoint = y + height / 2 + yOffset;
+
+  return pointFrom<GlobalPoint>(centerXPoint, centerYPoint);
+};

packages/element/src/binding.ts

@@ -6,6 +6,7 @@ import {
   invariant,
   isDevEnv,
   isTestEnv,
+  elementCenterPoint,
 } from "@excalidraw/common";
 
 import {
@@ -904,13 +905,7 @@ export const getHeadingForElbowArrowSnap = (
 
   if (!distance) {
     return vectorToHeading(
-      vectorFromPoint(
-        p,
-        pointFrom<GlobalPoint>(
-          bindableElement.x + bindableElement.width / 2,
-          bindableElement.y + bindableElement.height / 2,
-        ),
-      ),
+      vectorFromPoint(p, elementCenterPoint(bindableElement)),
     );
   }
 
@@ -1040,10 +1035,7 @@ export const avoidRectangularCorner = (
   element: ExcalidrawBindableElement,
   p: GlobalPoint,
 ): GlobalPoint => {
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
   const nonRotatedPoint = pointRotateRads(p, center, -element.angle as Radians);
 
   if (nonRotatedPoint[0] < element.x && nonRotatedPoint[1] < element.y) {
@@ -1140,10 +1132,9 @@ export const snapToMid = (
   tolerance: number = 0.05,
 ): GlobalPoint => {
   const { x, y, width, height, angle } = element;
-  const center = pointFrom<GlobalPoint>(
-    x + width / 2 - 0.1,
-    y + height / 2 - 0.1,
-  );
+
+  const center = elementCenterPoint(element, -0.1, -0.1);
+
   const nonRotated = pointRotateRads(p, center, -angle as Radians);
 
   // snap-to-center point is adaptive to element size, but we don't want to go
@@ -1228,10 +1219,7 @@ const updateBoundPoint = (
         startOrEnd === "startBinding" ? "start" : "end",
         elementsMap,
       ).fixedPoint;
-    const globalMidPoint = pointFrom<GlobalPoint>(
-      bindableElement.x + bindableElement.width / 2,
-      bindableElement.y + bindableElement.height / 2,
-    );
+    const globalMidPoint = elementCenterPoint(bindableElement);
     const global = pointFrom<GlobalPoint>(
       bindableElement.x + fixedPoint[0] * bindableElement.width,
       bindableElement.y + fixedPoint[1] * bindableElement.height,
@@ -1275,10 +1263,7 @@ const updateBoundPoint = (
         elementsMap,
       );
 
-    const center = pointFrom<GlobalPoint>(
-      bindableElement.x + bindableElement.width / 2,
-      bindableElement.y + bindableElement.height / 2,
-    );
+    const center = elementCenterPoint(bindableElement);
     const interceptorLength =
       pointDistance(adjacentPoint, edgePointAbsolute) +
       pointDistance(adjacentPoint, center) +
@@ -1771,10 +1756,7 @@ const determineFocusDistance = (
   // Another point on the line, in absolute coordinates (closer to element)
   b: GlobalPoint,
 ): number => {
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
 
   if (pointsEqual(a, b)) {
     return 0;
@@ -1904,10 +1886,7 @@ const determineFocusPoint = (
   focus: number,
   adjacentPoint: GlobalPoint,
 ): GlobalPoint => {
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
 
   if (focus === 0) {
     return center;
@@ -2338,10 +2317,7 @@ export const getGlobalFixedPointForBindableElement = (
       element.x + element.width * fixedX,
       element.y + element.height * fixedY,
     ),
-    pointFrom<GlobalPoint>(
-      element.x + element.width / 2,
-      element.y + element.height / 2,
-    ),
+    elementCenterPoint(element),
     element.angle,
   );
 };

packages/element/src/collision.ts

@@ -1,4 +1,4 @@
-import { isTransparent } from "@excalidraw/common";
+import { isTransparent, elementCenterPoint } from "@excalidraw/common";
 import {
   curveIntersectLineSegment,
   isPointWithinBounds,
@@ -16,7 +16,7 @@ import {
 } from "@excalidraw/math/ellipse";
 
 import { isPointInShape, isPointOnShape } from "@excalidraw/utils/collision";
-import { getPolygonShape } from "@excalidraw/utils/shape";
+import { type GeometricShape, getPolygonShape } from "@excalidraw/utils/shape";
 
 import type {
   GlobalPoint,
@@ -26,8 +26,6 @@ import type {
   Radians,
 } from "@excalidraw/math";
 
-import type { GeometricShape } from "@excalidraw/utils/shape";
-
 import type { FrameNameBounds } from "@excalidraw/excalidraw/types";
 
 import { getBoundTextShape, isPathALoop } from "./shapes";
@@ -191,10 +189,7 @@ const intersectRectanguloidWithLineSegment = (
   l: LineSegment<GlobalPoint>,
   offset: number = 0,
 ): GlobalPoint[] => {
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
   // To emulate a rotated rectangle we rotate the point in the inverse angle
   // instead. It's all the same distance-wise.
   const rotatedA = pointRotateRads<GlobalPoint>(
@@ -253,10 +248,7 @@ const intersectDiamondWithLineSegment = (
   l: LineSegment<GlobalPoint>,
   offset: number = 0,
 ): GlobalPoint[] => {
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
 
   // Rotate the point to the inverse direction to simulate the rotated diamond
   // points. It's all the same distance-wise.
@@ -304,10 +296,7 @@ const intersectEllipseWithLineSegment = (
   l: LineSegment<GlobalPoint>,
   offset: number = 0,
 ): GlobalPoint[] => {
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
 
   const rotatedA = pointRotateRads(l[0], center, -element.angle as Radians);
   const rotatedB = pointRotateRads(l[1], center, -element.angle as Radians);

packages/element/src/cropElement.ts

@@ -14,6 +14,8 @@ import {
 } from "@excalidraw/math";
 import { type Point } from "points-on-curve";
 
+import { elementCenterPoint } from "@excalidraw/common";
+
 import {
   getElementAbsoluteCoords,
   getResizedElementAbsoluteCoords,
@@ -61,7 +63,7 @@ export const cropElement = (
 
   const rotatedPointer = pointRotateRads(
     pointFrom(pointerX, pointerY),
-    pointFrom(element.x + element.width / 2, element.y + element.height / 2),
+    elementCenterPoint(element),
     -element.angle as Radians,
   );
 

packages/element/src/distance.ts

@@ -1,12 +1,13 @@
 import {
   curvePointDistance,
   distanceToLineSegment,
-  pointFrom,
   pointRotateRads,
 } from "@excalidraw/math";
 
 import { ellipse, ellipseDistanceFromPoint } from "@excalidraw/math/ellipse";
 
+import { elementCenterPoint } from "@excalidraw/common";
+
 import type { GlobalPoint, Radians } from "@excalidraw/math";
 
 import {
@@ -53,10 +54,7 @@ const distanceToRectanguloidElement = (
   element: ExcalidrawRectanguloidElement,
   p: GlobalPoint,
 ) => {
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
   // To emulate a rotated rectangle we rotate the point in the inverse angle
   // instead. It's all the same distance-wise.
   const rotatedPoint = pointRotateRads(p, center, -element.angle as Radians);
@@ -84,10 +82,7 @@ const distanceToDiamondElement = (
   element: ExcalidrawDiamondElement,
   p: GlobalPoint,
 ): number => {
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
 
   // Rotate the point to the inverse direction to simulate the rotated diamond
   // points. It's all the same distance-wise.
@@ -115,10 +110,7 @@ const distanceToEllipseElement = (
   element: ExcalidrawEllipseElement,
   p: GlobalPoint,
 ): number => {
-  const center = pointFrom(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
   return ellipseDistanceFromPoint(
     // Instead of rotating the ellipse, rotate the point to the inverse angle
     pointRotateRads(p, center, -element.angle as Radians),

packages/element/src/shapes.ts

@@ -4,6 +4,7 @@ import {
   LINE_CONFIRM_THRESHOLD,
   ROUNDNESS,
   invariant,
+  elementCenterPoint,
 } from "@excalidraw/common";
 import {
   isPoint,
@@ -297,7 +298,7 @@ export const aabbForElement = (
     midY: element.y + element.height / 2,
   };
 
-  const center = pointFrom(bbox.midX, bbox.midY);
+  const center = elementCenterPoint(element);
   const [topLeftX, topLeftY] = pointRotateRads(
     pointFrom(bbox.minX, bbox.minY),
     center,

packages/element/src/utils.ts

@@ -10,6 +10,8 @@ import {
   type GlobalPoint,
 } from "@excalidraw/math";
 
+import { elementCenterPoint } from "@excalidraw/common";
+
 import type { Curve, LineSegment } from "@excalidraw/math";
 
 import { getCornerRadius } from "./shapes";
@@ -68,10 +70,7 @@ export function deconstructRectanguloidElement(
     return [sides, []];
   }
 
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
 
   const r = rectangle(
     pointFrom(element.x, element.y),
@@ -254,10 +253,7 @@ export function deconstructDiamondElement(
     return [[topRight, bottomRight, bottomLeft, topLeft], []];
   }
 
-  const center = pointFrom<GlobalPoint>(
-    element.x + element.width / 2,
-    element.y + element.height / 2,
-  );
+  const center = elementCenterPoint(element);
 
   const [top, right, bottom, left]: GlobalPoint[] = [
     pointFrom(element.x + topX, element.y + topY),

packages/excalidraw/actions/actionProperties.tsx

@@ -121,6 +121,8 @@ import {
   ArrowheadCrowfootIcon,
   ArrowheadCrowfootOneIcon,
   ArrowheadCrowfootOneOrManyIcon,
+  snapShapeEnabledIcon,
+  snapShapeDisabledIcon,
 } from "../components/icons";
 
 import { Fonts } from "../fonts";
@@ -1818,3 +1820,41 @@ export const actionChangeArrowType = register({
     );
   },
 });
+
+export const actionToggleShapeSnap = register({
+  name: "toggleShapeSnap",
+  label: "Toggle Snap to Shape",
+  trackEvent: false,
+  perform: (elements, appState) => {
+    return {
+      elements,
+      appState: {
+        ...appState,
+        isShapeSnapEnabled: !appState.isShapeSnapEnabled,
+      },
+      captureUpdate: CaptureUpdateAction.IMMEDIATELY,
+    };
+  },
+  PanelComponent: ({ appState, updateData }) => (
+    <fieldset>
+      <legend>{t("labels.shapeSnap")}</legend>
+      <ButtonIconSelect
+        group="button"
+        options={[
+          {
+            value: false,
+            text: t("labels.shapeSnapDisable"),
+            icon: snapShapeDisabledIcon,
+          },
+          {
+            value: true,
+            text: t("labels.shapeSnapEnable"),
+            icon: snapShapeEnabledIcon,
+          },
+        ]}
+        value={appState.isShapeSnapEnabled}
+        onChange={(value) => updateData(value)}
+      />
+    </fieldset>
+  ),
+});

packages/excalidraw/actions/types.ts

@@ -125,6 +125,7 @@ export type ActionName =
   | "toggleLinearEditor"
   | "toggleEraserTool"
   | "toggleHandTool"
+  | "toggleShapeSnap"
   | "selectAllElementsInFrame"
   | "removeAllElementsFromFrame"
   | "updateFrameRendering"

packages/excalidraw/appState.ts

@@ -67,6 +67,7 @@ export const getDefaultAppState = (): Omit<
     gridStep: DEFAULT_GRID_STEP,
     gridModeEnabled: false,
     isBindingEnabled: true,
+    isShapeSnapEnabled: false,
     defaultSidebarDockedPreference: false,
     isLoading: false,
     isResizing: false,
@@ -188,6 +189,7 @@ const APP_STATE_STORAGE_CONF = (<
   gridModeEnabled: { browser: true, export: true, server: true },
   height: { browser: false, export: false, server: false },
   isBindingEnabled: { browser: false, export: false, server: false },
+  isShapeSnapEnabled: { browser: true, export: false, server: false },
   defaultSidebarDockedPreference: {
     browser: true,
     export: false,

packages/excalidraw/components/Actions.tsx

@@ -169,9 +169,12 @@ export const SelectedShapeActions = ({
         renderAction("changeStrokeWidth")}
 
       {(appState.activeTool.type === "freedraw" ||
-        targetElements.some((element) => element.type === "freedraw")) &&
-        renderAction("changeStrokeShape")}
-
+        targetElements.some((element) => element.type === "freedraw")) && (
+        <>
+          {renderAction("changeStrokeShape")}
+          {renderAction("toggleShapeSnap")}
+        </>
+      )}
       {(hasStrokeStyle(appState.activeTool.type) ||
         targetElements.some((element) => hasStrokeStyle(element.type))) && (
         <>

packages/excalidraw/components/App.tsx

@@ -19,6 +19,7 @@ import {
 } from "@excalidraw/math";
 import { isPointInShape } from "@excalidraw/utils/collision";
 import { getSelectionBoxShape } from "@excalidraw/utils/shape";
+import { convertToShape } from "@excalidraw/utils/snapToShape";
 
 import {
   COLOR_PALETTE,
@@ -9039,6 +9040,34 @@ class App extends React.Component<AppProps, AppState> {
           lastCommittedPoint: pointFrom<LocalPoint>(dx, dy),
         });
 
+        if (this.state.isShapeSnapEnabled) {
+          const detectedElement = convertToShape(newElement);
+
+          if (detectedElement !== newElement) {
+            if (detectedElement.type === "arrow") {
+              mutateElement(
+                detectedElement,
+                {
+                  startArrowhead: this.state.currentItemStartArrowhead,
+                  endArrowhead: this.state.currentItemEndArrowhead,
+                },
+                // TODO: Make arrows bind to nearby elements if possible
+              );
+            }
+
+            this.scene.replaceAllElements([
+              ...this.scene
+                .getElementsIncludingDeleted()
+                .filter((el) => el.id !== newElement.id),
+              detectedElement,
+            ]);
+
+            this.setState({
+              selectedElementIds: { [detectedElement.id]: true },
+            });
+          }
+        }
+
         this.actionManager.executeAction(actionFinalize);
 
         return;

packages/excalidraw/components/icons.tsx

@@ -1902,6 +1902,23 @@ export const eyeClosedIcon = createIcon(
   tablerIconProps,
 );
 
+export const snapShapeEnabledIcon = createIcon(
+  <g stroke="currentColor" fill="none" strokeWidth="1.5">
+    <rect x="4" y="4" width="16" height="16" rx="2" />
+    <circle cx="16" cy="8" r="1.5" fill="currentColor" />
+  </g>,
+  tablerIconProps,
+);
+
+export const snapShapeDisabledIcon = createIcon(
+  <g stroke="currentColor" fill="none" strokeWidth="1.5">
+    <rect x="4" y="4" width="16" height="16" rx="2" />
+    <line x1="4" y1="4" x2="20" y2="20" />
+    <line x1="4" y1="20" x2="20" y2="4" />
+  </g>,
+  tablerIconProps,
+);
+
 export const brainIcon = createIcon(
   <g stroke="currentColor" fill="none">
     <path stroke="none" d="M0 0h24v24H0z" fill="none" />

packages/excalidraw/locales/en.json

@@ -103,6 +103,9 @@
     "loadingScene": "Loading scene…",
     "loadScene": "Load scene from file",
     "align": "Align",
+    "shapeSnap": "Snap to shapes",
+    "shapeSnapDisable": "Disable snap to shapes",
+    "shapeSnapEnable": "Enable snap to shapes",
     "alignTop": "Align top",
     "alignBottom": "Align bottom",
     "alignLeft": "Align left",

packages/excalidraw/tests/__snapshots__/contextmenu.test.tsx.snap

@@ -934,6 +934,7 @@ exports[`contextMenu element > right-clicking on a group should select whole gro
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -1144,6 +1145,7 @@ exports[`contextMenu element > selecting 'Add to library' in context menu adds e
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -1364,6 +1366,7 @@ exports[`contextMenu element > selecting 'Bring forward' in context menu brings
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -1699,6 +1702,7 @@ exports[`contextMenu element > selecting 'Bring to front' in context menu brings
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -2034,6 +2038,7 @@ exports[`contextMenu element > selecting 'Copy styles' in context menu copies st
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -2254,6 +2259,7 @@ exports[`contextMenu element > selecting 'Delete' in context menu deletes elemen
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -2498,6 +2504,7 @@ exports[`contextMenu element > selecting 'Duplicate' in context menu duplicates
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -2803,6 +2810,7 @@ exports[`contextMenu element > selecting 'Group selection' in context menu group
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -3176,6 +3184,7 @@ exports[`contextMenu element > selecting 'Paste styles' in context menu pastes s
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -3655,6 +3664,7 @@ exports[`contextMenu element > selecting 'Send backward' in context menu sends e
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -3982,6 +3992,7 @@ exports[`contextMenu element > selecting 'Send to back' in context menu sends el
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -4309,6 +4320,7 @@ exports[`contextMenu element > selecting 'Ungroup selection' in context menu ung
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -5590,6 +5602,7 @@ exports[`contextMenu element > shows 'Group selection' in context menu for multi
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -6812,6 +6825,7 @@ exports[`contextMenu element > shows 'Ungroup selection' in context menu for gro
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -7747,6 +7761,7 @@ exports[`contextMenu element > shows context menu for canvas > [end of test] app
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -8754,6 +8769,7 @@ exports[`contextMenu element > shows context menu for element > [end of test] ap
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -9743,6 +9759,7 @@ exports[`contextMenu element > shows context menu for element > [end of test] ap
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",

packages/excalidraw/tests/__snapshots__/history.test.tsx.snap

@@ -60,6 +60,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "newElement": null,
@@ -660,6 +661,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "newElement": null,
@@ -1168,6 +1170,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "newElement": null,
@@ -1540,6 +1543,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "newElement": null,
@@ -1913,6 +1917,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "newElement": null,
@@ -2184,6 +2189,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
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@@ -2624,6 +2630,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -2927,6 +2934,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -3215,6 +3223,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -3513,6 +3522,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -3803,6 +3813,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -4042,6 +4053,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -4305,6 +4317,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -4582,6 +4595,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -4817,6 +4831,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -5052,6 +5067,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -5285,6 +5301,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
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@@ -5518,6 +5535,7 @@ exports[`history > multiplayer undo/redo > conflicts in frames and their childre
   "isLoading": false,
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@@ -5781,6 +5799,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
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+  "isShapeSnapEnabled": false,
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@@ -6116,6 +6135,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   "isLoading": false,
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@@ -6545,6 +6565,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
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@@ -6927,6 +6948,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   "isLoading": false,
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@@ -7250,6 +7272,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   "isLoading": false,
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@@ -7552,6 +7575,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   "isLoading": false,
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@@ -7785,6 +7809,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
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@@ -8144,6 +8169,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
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@@ -8503,6 +8529,7 @@ exports[`history > multiplayer undo/redo > should not let remote changes to inte
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@@ -8911,6 +8938,7 @@ exports[`history > multiplayer undo/redo > should not let remote changes to inte
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@@ -9202,6 +9230,7 @@ exports[`history > multiplayer undo/redo > should not let remote changes to inte
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@@ -9471,6 +9500,7 @@ exports[`history > multiplayer undo/redo > should not override remote changes on
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@@ -9739,6 +9769,7 @@ exports[`history > multiplayer undo/redo > should not override remote changes on
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@@ -9974,6 +10005,7 @@ exports[`history > multiplayer undo/redo > should override remotely added groups
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@@ -10279,6 +10311,7 @@ exports[`history > multiplayer undo/redo > should override remotely added points
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+  "isShapeSnapEnabled": false,
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@@ -10623,6 +10656,7 @@ exports[`history > multiplayer undo/redo > should redistribute deltas when eleme
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+  "isShapeSnapEnabled": false,
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@@ -10862,6 +10896,7 @@ exports[`history > multiplayer undo/redo > should redraw arrows on undo > [end o
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+  "isShapeSnapEnabled": false,
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@@ -11315,6 +11350,7 @@ exports[`history > multiplayer undo/redo > should update history entries after r
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+  "isShapeSnapEnabled": false,
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@@ -11573,6 +11609,7 @@ exports[`history > singleplayer undo/redo > remounting undo/redo buttons should
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+  "isShapeSnapEnabled": false,
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@@ -11816,6 +11853,7 @@ exports[`history > singleplayer undo/redo > should clear the redo stack on eleme
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+  "isShapeSnapEnabled": false,
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@@ -12061,6 +12099,7 @@ exports[`history > singleplayer undo/redo > should create entry when selecting f
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+  "isShapeSnapEnabled": false,
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@@ -12466,6 +12505,7 @@ exports[`history > singleplayer undo/redo > should create new history entry on s
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@@ -12717,6 +12757,7 @@ exports[`history > singleplayer undo/redo > should disable undo/redo buttons whe
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@@ -12962,6 +13003,7 @@ exports[`history > singleplayer undo/redo > should end up with no history entry
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@@ -13207,6 +13249,7 @@ exports[`history > singleplayer undo/redo > should iterate through the history w
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@@ -13458,6 +13501,7 @@ exports[`history > singleplayer undo/redo > should not clear the redo stack on s
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@@ -13794,6 +13838,7 @@ exports[`history > singleplayer undo/redo > should not collapse when applying co
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@@ -13970,6 +14015,7 @@ exports[`history > singleplayer undo/redo > should not end up with history entry
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@@ -14262,6 +14308,7 @@ exports[`history > singleplayer undo/redo > should not end up with history entry
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@@ -14533,6 +14580,7 @@ exports[`history > singleplayer undo/redo > should not override appstate changes
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@@ -14812,6 +14860,7 @@ exports[`history > singleplayer undo/redo > should support appstate name or view
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@@ -14977,6 +15026,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
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+  "isShapeSnapEnabled": false,
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@@ -15675,6 +15725,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
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@@ -16295,6 +16346,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
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@@ -16915,6 +16967,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
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@@ -17626,6 +17679,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
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@@ -18374,6 +18428,7 @@ exports[`history > singleplayer undo/redo > should support changes in elements'
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@@ -18852,6 +18907,7 @@ exports[`history > singleplayer undo/redo > should support duplication of groups
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+  "isShapeSnapEnabled": false,
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@@ -19378,6 +19434,7 @@ exports[`history > singleplayer undo/redo > should support element creation, del
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@@ -19838,6 +19895,7 @@ exports[`history > singleplayer undo/redo > should support linear element creati
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+  "isShapeSnapEnabled": false,
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packages/excalidraw/tests/__snapshots__/regressionTests.test.tsx.snap

@@ -60,6 +60,7 @@ exports[`given element A and group of elements B and given both are selected whe
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -476,6 +477,7 @@ exports[`given element A and group of elements B and given both are selected whe
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+  "isShapeSnapEnabled": false,
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@@ -883,6 +885,7 @@ exports[`regression tests > Cmd/Ctrl-click exclusively select element under poin
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -1429,6 +1432,7 @@ exports[`regression tests > Drags selected element when hitting only bounding bo
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+  "isShapeSnapEnabled": false,
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@@ -1634,6 +1638,7 @@ exports[`regression tests > adjusts z order when grouping > [end of test] appSta
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+  "isShapeSnapEnabled": false,
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@@ -2010,6 +2015,7 @@ exports[`regression tests > alt-drag duplicates an element > [end of test] appSt
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+  "isShapeSnapEnabled": false,
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@@ -2249,6 +2255,7 @@ exports[`regression tests > arrow keys > [end of test] appState 1`] = `
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -2430,6 +2437,7 @@ exports[`regression tests > can drag element that covers another element, while
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+  "isShapeSnapEnabled": false,
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@@ -2751,6 +2759,7 @@ exports[`regression tests > change the properties of a shape > [end of test] app
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -2998,6 +3007,7 @@ exports[`regression tests > click on an element and drag it > [dragged] appState
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -3242,6 +3252,7 @@ exports[`regression tests > click on an element and drag it > [end of test] appS
   "isLoading": false,
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   "isRotating": false,
+  "isShapeSnapEnabled": false,
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@@ -3473,6 +3484,7 @@ exports[`regression tests > click to select a shape > [end of test] appState 1`]
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
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@@ -3730,6 +3742,7 @@ exports[`regression tests > click-drag to select a group > [end of test] appStat
   "isLoading": false,
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   "isRotating": false,
+  "isShapeSnapEnabled": false,
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@@ -4042,6 +4055,7 @@ exports[`regression tests > deleting last but one element in editing group shoul
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+  "isShapeSnapEnabled": false,
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@@ -4465,6 +4479,7 @@ exports[`regression tests > deselects group of selected elements on pointer down
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -4749,6 +4764,7 @@ exports[`regression tests > deselects group of selected elements on pointer up w
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -5003,6 +5019,7 @@ exports[`regression tests > deselects selected element on pointer down when poin
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+  "isShapeSnapEnabled": false,
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@@ -5214,6 +5231,7 @@ exports[`regression tests > deselects selected element, on pointer up, when clic
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+  "isShapeSnapEnabled": false,
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@@ -5414,6 +5432,7 @@ exports[`regression tests > double click to edit a group > [end of test] appStat
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -5797,6 +5816,7 @@ exports[`regression tests > drags selected elements from point inside common bou
   "isLoading": false,
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+  "isShapeSnapEnabled": false,
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@@ -6088,6 +6108,7 @@ exports[`regression tests > draw every type of shape > [end of test] appState 1`
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
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@@ -6897,6 +6918,7 @@ exports[`regression tests > given a group of selected elements with an element t
   "isLoading": false,
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   "isRotating": false,
+  "isShapeSnapEnabled": false,
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@@ -7228,6 +7250,7 @@ exports[`regression tests > given a selected element A and a not selected elemen
   "isLoading": false,
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   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
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@@ -7505,6 +7528,7 @@ exports[`regression tests > given selected element A with lower z-index than uns
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -7740,6 +7764,7 @@ exports[`regression tests > given selected element A with lower z-index than uns
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -7978,6 +8003,7 @@ exports[`regression tests > key 2 selects rectangle tool > [end of test] appStat
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -8159,6 +8185,7 @@ exports[`regression tests > key 3 selects diamond tool > [end of test] appState
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -8340,6 +8367,7 @@ exports[`regression tests > key 4 selects ellipse tool > [end of test] appState
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -8521,6 +8549,7 @@ exports[`regression tests > key 5 selects arrow tool > [end of test] appState 1`
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -8745,6 +8774,7 @@ exports[`regression tests > key 6 selects line tool > [end of test] appState 1`]
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -8968,6 +8998,7 @@ exports[`regression tests > key 7 selects freedraw tool > [end of test] appState
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -9163,6 +9194,7 @@ exports[`regression tests > key a selects arrow tool > [end of test] appState 1`
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -9387,6 +9419,7 @@ exports[`regression tests > key d selects diamond tool > [end of test] appState
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -9568,6 +9601,7 @@ exports[`regression tests > key l selects line tool > [end of test] appState 1`]
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -9791,6 +9825,7 @@ exports[`regression tests > key o selects ellipse tool > [end of test] appState
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -9972,6 +10007,7 @@ exports[`regression tests > key p selects freedraw tool > [end of test] appState
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -10167,6 +10203,7 @@ exports[`regression tests > key r selects rectangle tool > [end of test] appStat
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -10348,6 +10385,7 @@ exports[`regression tests > make a group and duplicate it > [end of test] appSta
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -10857,6 +10895,7 @@ exports[`regression tests > noop interaction after undo shouldn't create history
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -11135,6 +11174,7 @@ exports[`regression tests > pinch-to-zoom works > [end of test] appState 1`] = `
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "touch",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -11262,6 +11302,7 @@ exports[`regression tests > shift click on selected element should deselect it o
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -11462,6 +11503,7 @@ exports[`regression tests > shift-click to multiselect, then drag > [end of test
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -11774,6 +11816,7 @@ exports[`regression tests > should group elements and ungroup them > [end of tes
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -12187,6 +12230,7 @@ exports[`regression tests > single-clicking on a subgroup of a selected group sh
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -12801,6 +12845,7 @@ exports[`regression tests > spacebar + drag scrolls the canvas > [end of test] a
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -12931,6 +12976,7 @@ exports[`regression tests > supports nested groups > [end of test] appState 1`]
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -13516,6 +13562,7 @@ exports[`regression tests > switches from group of selected elements to another
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -13855,6 +13902,7 @@ exports[`regression tests > switches selected element on pointer down > [end of
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -14121,6 +14169,7 @@ exports[`regression tests > two-finger scroll works > [end of test] appState 1`]
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "touch",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -14248,6 +14297,7 @@ exports[`regression tests > undo/redo drawing an element > [end of test] appStat
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -14628,6 +14678,7 @@ exports[`regression tests > updates fontSize & fontFamily appState > [end of tes
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",
@@ -14755,6 +14806,7 @@ exports[`regression tests > zoom hotkeys > [end of test] appState 1`] = `
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "Untitled-201933152653",

packages/excalidraw/tests/helpers/ui.ts

@@ -20,7 +20,7 @@ import {
   isTextElement,
   isFrameLikeElement,
 } from "@excalidraw/element/typeChecks";
-import { KEYS, arrayToMap } from "@excalidraw/common";
+import { KEYS, arrayToMap, elementCenterPoint } from "@excalidraw/common";
 
 import type { GlobalPoint, LocalPoint, Radians } from "@excalidraw/math";
 
@@ -151,7 +151,7 @@ export class Keyboard {
 const getElementPointForSelection = (
   element: ExcalidrawElement,
 ): GlobalPoint => {
-  const { x, y, width, height, angle } = element;
+  const { x, y, width, angle } = element;
   const target = pointFrom<GlobalPoint>(
     x +
       (isLinearElement(element) || isFreeDrawElement(element) ? 0 : width / 2),
@@ -166,7 +166,7 @@ const getElementPointForSelection = (
       (bounds[1] + bounds[3]) / 2,
     );
   } else {
-    center = pointFrom(x + width / 2, y + height / 2);
+    center = elementCenterPoint(element);
   }
 
   if (isTextElement(element)) {

packages/excalidraw/tests/packages/__snapshots__/utils.test.ts.snap

@@ -53,6 +53,7 @@ exports[`exportToSvg > with default arguments 1`] = `
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "name",

packages/excalidraw/types.ts

@@ -333,6 +333,7 @@ export interface AppState {
   currentHoveredFontFamily: FontFamilyValues | null;
   currentItemRoundness: StrokeRoundness;
   currentItemArrowType: "sharp" | "round" | "elbow";
+  isShapeSnapEnabled: boolean;
   viewBackgroundColor: string;
   scrollX: number;
   scrollY: number;
@@ -912,3 +913,17 @@ export type Offsets = Partial<{
   bottom: number;
   left: number;
 }>;
+
+export type ShapeDetectionType =
+  | "rectangle"
+  | "ellipse"
+  | "diamond"
+  | "arrow"
+  | "line"
+  | "freedraw";
+
+export interface ShapeDetectionResult {
+  type: ShapeDetectionType;
+  points: readonly (readonly [number, number])[];
+  confidence: number;
+}

packages/math/src/point.ts

@@ -1,6 +1,6 @@
-import { degreesToRadians } from "./angle";
+import { degreesToRadians, radiansToDegrees } from "./angle";
 import { PRECISION } from "./utils";
-import { vectorFromPoint, vectorScale } from "./vector";
+import { vectorDot, vectorFromPoint, vectorScale } from "./vector";
 
 import type {
   LocalPoint,
@@ -230,3 +230,67 @@ export const isPointWithinBounds = <P extends GlobalPoint | LocalPoint>(
     q[1] >= Math.min(p[1], r[1])
   );
 };
+
+/**
+ * Calculates the perpendicular distance from a point to a line segment defined by two endpoints.
+ *
+ * If the segment is of zero length, the function returns the distance from the point to the start.
+ *
+ * @typeParam P - The point type, restricted to LocalPoint or GlobalPoint.
+ * @param p - The point from which the perpendicular distance is measured.
+ * @param start - The starting point of the line segment.
+ * @param end - The ending point of the line segment.
+ * @returns The perpendicular distance from point p to the line segment defined by start and end.
+ */
+export const perpendicularDistance = <P extends GlobalPoint | LocalPoint>(
+  p: P,
+  start: P,
+  end: P,
+): number => {
+  const dx = end[0] - start[0];
+  const dy = end[1] - start[1];
+  if (dx === 0 && dy === 0) {
+    return Math.hypot(p[0] - start[0], p[1] - start[1]);
+  }
+  // Equation of line distance
+  const numerator = Math.abs(
+    dy * p[0] - dx * p[1] + end[0] * start[1] - end[1] * start[0],
+  );
+  const denom = Math.hypot(dx, dy);
+  return numerator / denom;
+};
+
+/** * Calculates the angle between three points in degrees.
+ * The angle is calculated at the first point (p0) using the second (p1) and third (p2) points.
+ * The angle is measured in degrees and is always positive.
+ * The function uses the dot product and the arccosine function to calculate the angle. * The result is clamped to the range [-1, 1] to avoid precision errors.
+ * @param p0 The first point used to form the angle.
+ * @param p1 The vertex point where the angle is calculated.
+ * @param p2 The second point used to form the angle.
+ * @returns The angle in degrees between the three points.
+ **/
+export const angleBetween = <P extends GlobalPoint | LocalPoint>(
+  p0: P,
+  p1: P,
+  p2: P,
+): Degrees => {
+  const v1 = vectorFromPoint(p0, p1);
+  const v2 = vectorFromPoint(p1, p2);
+
+  // dot and cross product
+  const magnitude1 = Math.hypot(v1[0], v1[1]);
+  const magnitude2 = Math.hypot(v2[0], v2[1]);
+
+  if (magnitude1 === 0 || magnitude2 === 0) {
+    return 0 as Degrees;
+  }
+
+  const dot = vectorDot(v1, v2);
+
+  let cos = dot / (magnitude1 * magnitude2);
+  // Clamp cos to [-1,1] to avoid precision errors
+  cos = Math.max(-1, Math.min(1, cos));
+  const rad = Math.acos(cos) as Radians;
+
+  return radiansToDegrees(rad);
+};

packages/utils/src/snapToShape.ts

@@ -0,0 +1,435 @@
+import {
+  getCenterForBounds,
+  getCommonBoundingBox,
+} from "@excalidraw/element/bounds";
+import {
+  newArrowElement,
+  newElement,
+  newLinearElement,
+} from "@excalidraw/element/newElement";
+
+import {
+  angleBetween,
+  perpendicularDistance,
+  pointDistance,
+} from "@excalidraw/math";
+import { ROUNDNESS } from "@excalidraw/common";
+
+import type { LocalPoint } from "@excalidraw/math";
+
+import type { BoundingBox, Bounds } from "@excalidraw/element/bounds";
+import type {
+  ExcalidrawArrowElement,
+  ExcalidrawDiamondElement,
+  ExcalidrawElement,
+  ExcalidrawEllipseElement,
+  ExcalidrawFreeDrawElement,
+  ExcalidrawLinearElement,
+  ExcalidrawRectangleElement,
+} from "@excalidraw/element/types";
+
+type Shape =
+  | ExcalidrawRectangleElement["type"]
+  | ExcalidrawEllipseElement["type"]
+  | ExcalidrawDiamondElement["type"]
+  | ExcalidrawArrowElement["type"]
+  | ExcalidrawLinearElement["type"]
+  | ExcalidrawFreeDrawElement["type"];
+
+interface ShapeRecognitionResult {
+  type: Shape;
+  simplified: readonly LocalPoint[];
+  boundingBox: BoundingBox;
+}
+
+const QUADRILATERAL_SIDES = 4;
+const QUADRILATERAL_MIN_POINTS = 4; // RDP simplified vertices
+const QUADRILATERAL_MAX_POINTS = 5; // RDP might include closing point
+const ARROW_EXPECTED_POINTS = 5; // RDP simplified vertices for arrow shape
+const LINE_EXPECTED_POINTS = 2; // RDP simplified vertices for line shape
+
+const DEFAULT_OPTIONS = {
+  // Max distance between stroke start/end (as % of bbox diagonal) to consider closed
+  shapeIsClosedPercentThreshold: 20,
+  // Min distance (px) to consider shape closed (takes precedence if larger than %)
+  shapeIsClosedDistanceThreshold: 10,
+  // RDP simplification tolerance (% of bbox diagonal)
+  rdpTolerancePercent: 10,
+  // Arrow specific thresholds
+  arrowMinTipAngle: 30, // Min angle degrees for the tip
+  arrowMaxTipAngle: 150, // Max angle degrees for the tip
+  arrowHeadMaxShaftRatio: 0.8, // Max length ratio of arrowhead segment to shaft
+  // Quadrilateral specific thresholds
+  rectangleMinCornerAngle: 20, // Min deviation from 180 degrees for a valid corner
+  rectangleMaxCornerAngle: 160, // Max deviation from 0 degrees for a valid corner
+  // Angle difference (degrees) to nearest 0/90 orientation to classify as rectangle
+  rectangleOrientationAngleThreshold: 10,
+  // Max variance in radius (normalized) to consider a shape an ellipse
+  ellipseRadiusVarianceThreshold: 0.5,
+} as const; // Use 'as const' for stricter typing of default values
+
+// Options for shape recognition, allowing partial overrides
+type ShapeRecognitionOptions = typeof DEFAULT_OPTIONS;
+type PartialShapeRecognitionOptions = Partial<ShapeRecognitionOptions>;
+
+interface Segment {
+  length: number;
+  angleDeg: number; // Angle in degrees [0, 180) representing the line's orientation
+}
+
+/**
+ * Simplify a polyline using Ramer-Douglas-Peucker algorithm.
+ */
+function simplifyRDP(
+  points: readonly LocalPoint[],
+  epsilon: number,
+): readonly LocalPoint[] {
+  if (points.length < 3) {
+    return points;
+  }
+
+  const first = points[0];
+  const last = points[points.length - 1];
+  let index = -1;
+  let maxDist = 0;
+
+  // Find the point with the maximum distance from the line segment between first and last
+  for (let i = 1; i < points.length - 1; i++) {
+    const dist = perpendicularDistance(points[i], first, last);
+    if (dist > maxDist) {
+      maxDist = dist;
+      index = i;
+    }
+  }
+
+  // If max distance is greater than epsilon, recursively simplify
+  if (maxDist > epsilon && index !== -1) {
+    const left = simplifyRDP(points.slice(0, index + 1), epsilon);
+    const right = simplifyRDP(points.slice(index), epsilon);
+    // Concatenate results (omit duplicate point at junction)
+    return left.slice(0, -1).concat(right);
+  }
+  // Not enough deviation, return straight line segment (keep only endpoints)
+  return [first, last];
+}
+
+/**
+ * Calculates the properties (length, angle) of segments in a polygon.
+ */
+function calculateSegments(vertices: readonly LocalPoint[]): Segment[] {
+  const segments: Segment[] = [];
+  const numVertices = vertices.length;
+  for (let i = 0; i < numVertices; i++) {
+    const p1 = vertices[i];
+    // Ensure wrapping for the last segment connecting back to the start
+    const p2 = vertices[(i + 1) % numVertices];
+    const dx = p2[0] - p1[0];
+    const dy = p2[1] - p1[1];
+    const length = Math.hypot(dx, dy);
+
+    // Calculate angle in degrees [0, 360)
+    let angleRad = Math.atan2(dy, dx);
+    if (angleRad < 0) {
+      angleRad += 2 * Math.PI;
+    }
+    let angleDeg = (angleRad * 180) / Math.PI;
+
+    // Normalize angle to [0, 180) for undirected line orientation
+    if (angleDeg >= 180) {
+      angleDeg -= 180;
+    }
+
+    segments.push({ length, angleDeg });
+  }
+  return segments;
+}
+
+/**
+ * Checks if the shape is closed based on the distance between start and end points.
+ */
+function isShapeClosed(
+  points: readonly LocalPoint[],
+  boundingBoxDiagonal: number,
+  options: ShapeRecognitionOptions,
+): boolean {
+  const start = points[0];
+  const end = points[points.length - 1];
+  const closedDist = pointDistance(start, end);
+  const closedThreshold = Math.max(
+    options.shapeIsClosedDistanceThreshold,
+    boundingBoxDiagonal * (options.shapeIsClosedPercentThreshold / 100),
+  );
+  return closedDist < closedThreshold;
+}
+
+/**
+ * Checks if a quadrilateral is likely axis-aligned based on its segment angles.
+ */
+function isAxisAligned(
+  segments: Segment[],
+  orientationThreshold: number,
+): boolean {
+  return segments.some((seg) => {
+    const angle = seg.angleDeg;
+    // Distance to horizontal (0 or 180 degrees)
+    const distToHoriz = Math.min(angle, 180 - angle);
+    // Distance to vertical (90 degrees)
+    const distToVert = Math.abs(angle - 90);
+    return (
+      distToHoriz < orientationThreshold || distToVert < orientationThreshold
+    );
+  });
+}
+
+/**
+ * Calculates the variance of the distance from points to a center point.
+ * Returns a normalized variance value (0 = perfectly round).
+ */
+function calculateRadiusVariance(
+  points: readonly LocalPoint[],
+  boundingBox: BoundingBox,
+): number {
+  if (points.length === 0) {
+    return 0; // Or handle as an error/special case
+  }
+
+  const [cx, cy] = getCenterForBounds([
+    boundingBox.minX,
+    boundingBox.minY,
+    boundingBox.maxX,
+    boundingBox.maxY,
+  ] as Bounds);
+
+  let totalDist = 0;
+  let maxDist = 0;
+  let minDist = Infinity;
+
+  for (const p of points) {
+    const d = Math.hypot(p[0] - cx, p[1] - cy);
+    totalDist += d;
+    maxDist = Math.max(maxDist, d);
+    minDist = Math.min(minDist, d);
+  }
+
+  const avgDist = totalDist / points.length;
+
+  // Avoid division by zero if avgDist is 0 (e.g., all points are at the center)
+  if (avgDist === 0) {
+    return 0;
+  }
+
+  const radiusVariance = (maxDist - minDist) / avgDist;
+  return radiusVariance;
+}
+
+/** Checks if the points form a straight line segment. */
+function checkLine(
+  points: readonly LocalPoint[],
+  isClosed: boolean,
+): Shape | null {
+  if (!isClosed && points.length === LINE_EXPECTED_POINTS) {
+    return "line";
+  }
+  return null;
+}
+
+/** Checks if the points form an arrow shape. */
+function checkArrow(
+  points: readonly LocalPoint[],
+  isClosed: boolean,
+  options: ShapeRecognitionOptions,
+): Shape | null {
+  if (isClosed || points.length !== ARROW_EXPECTED_POINTS) {
+    return null;
+  }
+
+  const shaftStart = points[0];
+  const shaftEnd = points[1]; // Assuming RDP simplifies shaft to 2 points
+  const arrowBase = points[2];
+  const arrowTip = points[3];
+  const arrowTailEnd = points[4];
+
+  const tipAngle = angleBetween(arrowTip, arrowBase, arrowTailEnd);
+
+  if (
+    tipAngle <= options.arrowMinTipAngle ||
+    tipAngle >= options.arrowMaxTipAngle
+  ) {
+    return null;
+  }
+
+  const headSegment1Len = pointDistance(arrowBase, arrowTip);
+  const headSegment2Len = pointDistance(arrowTip, arrowTailEnd);
+  const shaftLen = pointDistance(shaftStart, shaftEnd); // Approx shaft length
+
+  // Heuristic: Arrowhead segments should be significantly shorter than the shaft
+  const isHeadShortEnough =
+    headSegment1Len < shaftLen * options.arrowHeadMaxShaftRatio &&
+    headSegment2Len < shaftLen * options.arrowHeadMaxShaftRatio;
+
+  return isHeadShortEnough ? "arrow" : null;
+}
+
+/** Checks if the points form a rectangle or diamond shape. */
+function checkQuadrilateral(
+  points: readonly LocalPoint[],
+  isClosed: boolean,
+  options: ShapeRecognitionOptions,
+): Shape | null {
+  if (
+    !isClosed ||
+    points.length < QUADRILATERAL_MIN_POINTS ||
+    points.length > QUADRILATERAL_MAX_POINTS
+  ) {
+    return null;
+  }
+
+  // Take the first 4 points as vertices (RDP might add 5th closing point)
+  const vertices = points.slice(0, QUADRILATERAL_SIDES);
+  // console.log("Vertices (Quad Check):", vertices);
+
+  // Calculate internal angles
+  const angles: number[] = [];
+  for (let i = 0; i < QUADRILATERAL_SIDES; i++) {
+    const p1 = vertices[i];
+    const p2 = vertices[(i + 1) % QUADRILATERAL_SIDES];
+    const p3 = vertices[(i + 2) % QUADRILATERAL_SIDES];
+
+    angles.push(angleBetween(p1, p2, p3));
+  }
+
+  const allCornersAreValid = angles.every(
+    (a) =>
+      a > options.rectangleMinCornerAngle &&
+      a < options.rectangleMaxCornerAngle,
+  );
+
+  if (!allCornersAreValid) {
+    return null;
+  }
+
+  const segments = calculateSegments(vertices);
+
+  if (isAxisAligned(segments, options.rectangleOrientationAngleThreshold)) {
+    return "rectangle";
+  }
+  // Not axis-aligned, but quadrilateral => classify as diamond
+  return "diamond";
+}
+
+/** Checks if the points form an ellipse shape. */
+function checkEllipse(
+  points: readonly LocalPoint[],
+  isClosed: boolean,
+  boundingBox: BoundingBox,
+  options: ShapeRecognitionOptions,
+): Shape | null {
+  if (!isClosed) {
+    return null;
+  }
+
+  // Need a minimum number of points for it to be an ellipse
+  if (points.length < QUADRILATERAL_MAX_POINTS) {
+    return null;
+  }
+
+  const radiusVariance = calculateRadiusVariance(points, boundingBox);
+
+  return radiusVariance < options.ellipseRadiusVarianceThreshold
+    ? "ellipse"
+    : null;
+}
+
+/**
+ * Recognizes common shapes from free-draw input points.
+ * @param element The freedraw element to analyze.
+ * @param opts Optional overrides for recognition thresholds.
+ * @returns Information about the recognized shape.
+ */
+export const recognizeShape = (
+  element: ExcalidrawFreeDrawElement,
+  opts: PartialShapeRecognitionOptions = {},
+): ShapeRecognitionResult => {
+  const options = { ...DEFAULT_OPTIONS, ...opts };
+  const { points } = element;
+  const boundingBox = getCommonBoundingBox([element]);
+
+  // Need at least a few points to recognize a shape
+  if (!points || points.length < 3) {
+    return { type: "freedraw", simplified: points, boundingBox };
+  }
+
+  const boundingBoxDiagonal = Math.hypot(boundingBox.width, boundingBox.height);
+  const rdpTolerance =
+    boundingBoxDiagonal * (options.rdpTolerancePercent / 100);
+  const simplifiedPoints = simplifyRDP(points, rdpTolerance);
+
+  const isClosed = isShapeClosed(
+    simplifiedPoints,
+    boundingBoxDiagonal,
+    options,
+  );
+
+  // --- Shape check order matters here ---
+  const recognizedType: Shape =
+    checkLine(simplifiedPoints, isClosed) ??
+    checkArrow(simplifiedPoints, isClosed, options) ??
+    checkQuadrilateral(simplifiedPoints, isClosed, options) ??
+    checkEllipse(simplifiedPoints, isClosed, boundingBox, options) ??
+    "freedraw"; // Default if no other shape matches
+
+  return {
+    type: recognizedType,
+    simplified: simplifiedPoints,
+    boundingBox,
+  };
+};
+
+/**
+ * Converts a freedraw element to the detected shape
+ */
+export const convertToShape = (
+  freeDrawElement: ExcalidrawFreeDrawElement,
+): ExcalidrawElement => {
+  const recognizedShape = recognizeShape(freeDrawElement);
+
+  switch (recognizedShape.type) {
+    case "rectangle":
+    case "diamond":
+    case "ellipse": {
+      return newElement({
+        ...freeDrawElement,
+        roundness: { type: ROUNDNESS.PROPORTIONAL_RADIUS },
+        type: recognizedShape.type,
+        x: recognizedShape.boundingBox.minX,
+        y: recognizedShape.boundingBox.minY,
+        width: recognizedShape.boundingBox.width!,
+        height: recognizedShape.boundingBox.height!,
+      });
+    }
+    case "arrow": {
+      return newArrowElement({
+        ...freeDrawElement,
+        type: recognizedShape.type,
+        points: [
+          recognizedShape.simplified[0],
+          recognizedShape.simplified[recognizedShape.simplified.length - 2],
+        ],
+        roundness: { type: ROUNDNESS.PROPORTIONAL_RADIUS },
+      });
+    }
+    case "line": {
+      return newLinearElement({
+        ...freeDrawElement,
+        type: recognizedShape.type,
+        points: [
+          recognizedShape.simplified[0],
+          recognizedShape.simplified[recognizedShape.simplified.length - 1],
+        ],
+        roundness: { type: ROUNDNESS.PROPORTIONAL_RADIUS },
+      });
+    }
+    default:
+      return freeDrawElement;
+  }
+};

packages/utils/tests/__snapshots__/export.test.ts.snap

@@ -60,6 +60,7 @@ exports[`exportToSvg > with default arguments 1`] = `
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "name",

packages/utils/tests/__snapshots__/utils.test.ts.snap

@@ -53,6 +53,7 @@ exports[`exportToSvg > with default arguments 1`] = `
   "isLoading": false,
   "isResizing": false,
   "isRotating": false,
+  "isShapeSnapEnabled": false,
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "name",