fix: make arrow binding area adapt to zoom levels (#8927)

* make binding area adapt to zoom

* revert stroke color

* normalize binding gap

* reduce normalized gap

packages/excalidraw/actions/actionDeleteSelected.tsx

@@ -161,6 +161,7 @@ export const actionDeleteSelected = register({
         element,
         selectedPointsIndices,
         elementsMap,
+        appState.zoom,
       );
 
       return {

packages/excalidraw/actions/actionFlip.ts

@@ -153,6 +153,7 @@ const flipElements = (
     app.scene,
     isBindingEnabled(appState),
     [],
+    appState.zoom,
   );
 
   // ---------------------------------------------------------------------------

packages/excalidraw/actions/actionProperties.tsx

@@ -1591,6 +1591,7 @@ export const actionChangeArrowType = register({
               tupleToCoors(startGlobalPoint),
               elements,
               elementsMap,
+              appState.zoom,
               true,
             );
           const endHoveredElement =
@@ -1599,6 +1600,7 @@ export const actionChangeArrowType = register({
               tupleToCoors(endGlobalPoint),
               elements,
               elementsMap,
+              appState.zoom,
               true,
             );
           const startElement = startHoveredElement

packages/excalidraw/components/App.tsx

@@ -3215,6 +3215,10 @@ class App extends React.Component<AppProps, AppState> {
               ),
             ),
             [el.points[0], el.points[el.points.length - 1]],
+            undefined,
+            {
+              zoom: this.state.zoom,
+            },
           ),
         };
       }
@@ -4372,6 +4376,7 @@ class App extends React.Component<AppProps, AppState> {
 
           updateBoundElements(element, this.scene.getNonDeletedElementsMap(), {
             simultaneouslyUpdated: selectedElements,
+            zoom: this.state.zoom,
           });
         });
 
@@ -4381,6 +4386,7 @@ class App extends React.Component<AppProps, AppState> {
               (element) => element.id !== elbowArrow?.id || step !== 0,
             ),
             this.scene.getNonDeletedElementsMap(),
+            this.state.zoom,
           ),
         });
 
@@ -4596,6 +4602,7 @@ class App extends React.Component<AppProps, AppState> {
         this.scene,
         isBindingEnabled(this.state),
         this.state.selectedLinearElement?.selectedPointsIndices ?? [],
+        this.state.zoom,
       );
       this.setState({ suggestedBindings: [] });
     }
@@ -5854,6 +5861,7 @@ class App extends React.Component<AppProps, AppState> {
             {
               isDragging: true,
               informMutation: false,
+              zoom: this.state.zoom,
             },
           );
         } else {
@@ -7401,6 +7409,7 @@ class App extends React.Component<AppProps, AppState> {
       pointerDownState.origin,
       this.scene.getNonDeletedElements(),
       this.scene.getNonDeletedElementsMap(),
+      this.state.zoom,
     );
 
     this.setState({
@@ -7698,6 +7707,7 @@ class App extends React.Component<AppProps, AppState> {
         pointerDownState.origin,
         this.scene.getNonDeletedElements(),
         this.scene.getNonDeletedElementsMap(),
+        this.state.zoom,
         isElbowArrow(element),
       );
 
@@ -8276,6 +8286,7 @@ class App extends React.Component<AppProps, AppState> {
               suggestedBindings: getSuggestedBindingsForArrows(
                 selectedElements,
                 this.scene.getNonDeletedElementsMap(),
+                this.state.zoom,
               ),
             });
           }
@@ -8444,6 +8455,7 @@ class App extends React.Component<AppProps, AppState> {
               {
                 isDragging: true,
                 informMutation: false,
+                zoom: this.state.zoom,
               },
             );
           } else if (points.length === 2) {
@@ -9408,6 +9420,7 @@ class App extends React.Component<AppProps, AppState> {
           this.scene,
           isBindingEnabled(this.state),
           this.state.selectedLinearElement?.selectedPointsIndices ?? [],
+          this.state.zoom,
         );
       }
 
@@ -9900,6 +9913,7 @@ class App extends React.Component<AppProps, AppState> {
       pointerCoords,
       this.scene.getNonDeletedElements(),
       this.scene.getNonDeletedElementsMap(),
+      this.state.zoom,
     );
     this.setState({
       suggestedBindings:
@@ -9928,6 +9942,7 @@ class App extends React.Component<AppProps, AppState> {
           coords,
           this.scene.getNonDeletedElements(),
           this.scene.getNonDeletedElementsMap(),
+          this.state.zoom,
           isArrowElement(linearElement) && isElbowArrow(linearElement),
         );
         if (
@@ -10569,6 +10584,7 @@ class App extends React.Component<AppProps, AppState> {
       const suggestedBindings = getSuggestedBindingsForArrows(
         selectedElements,
         this.scene.getNonDeletedElementsMap(),
+        this.state.zoom,
       );
 
       const elementsToHighlight = new Set<ExcalidrawElement>();

packages/excalidraw/components/Stats/utils.ts

@@ -300,6 +300,7 @@ export const updateBindings = (
   options?: {
     simultaneouslyUpdated?: readonly ExcalidrawElement[];
     newSize?: { width: number; height: number };
+    zoom?: AppState["zoom"];
   },
 ) => {
   if (isLinearElement(latestElement)) {
@@ -310,6 +311,7 @@ export const updateBindings = (
       scene,
       true,
       [],
+      options?.zoom,
     );
   } else {
     updateBoundElements(latestElement, elementsMap, options);

packages/excalidraw/data/__snapshots__/transform.test.ts.snap

@@ -95,7 +95,7 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing s
   "fillStyle": "solid",
   "frameId": null,
   "groupIds": [],
-  "height": 35,
+  "height": 33.519031369643244,
   "id": Any<String>,
   "index": "a2",
   "isDeleted": false,
@@ -109,8 +109,8 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing s
       0.5,
     ],
     [
-      394.5,
-      34.5,
+      382.47606040672997,
+      34.019031369643244,
     ],
   ],
   "roughness": 1,
@@ -128,9 +128,9 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing s
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 4,
+  "version": 7,
   "versionNonce": Any<Number>,
-  "width": 395,
+  "width": 381.97606040672997,
   "x": 247,
   "y": 420,
 }
@@ -167,7 +167,7 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing s
       0,
     ],
     [
-      399.5,
+      389.5,
       0,
     ],
   ],
@@ -186,10 +186,10 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing s
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 4,
+  "version": 6,
   "versionNonce": Any<Number>,
-  "width": 400,
-  "x": 227,
+  "width": 390,
+  "x": 237,
   "y": 450,
 }
 `;
@@ -319,7 +319,7 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing t
   "verticalAlign": "top",
   "width": 100,
   "x": 560,
-  "y": 226.5,
+  "y": 236.95454545454544,
 }
 `;
 
@@ -339,13 +339,13 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing t
   "endBinding": {
     "elementId": "text-2",
     "fixedPoint": null,
-    "focus": 0,
-    "gap": 205,
+    "focus": 1.625925925925924,
+    "gap": 14,
   },
   "fillStyle": "solid",
   "frameId": null,
   "groupIds": [],
-  "height": 0,
+  "height": 18.278619528619487,
   "id": Any<String>,
   "index": "a2",
   "isDeleted": false,
@@ -356,11 +356,11 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing t
   "points": [
     [
       0.5,
-      0,
+      -0.5,
     ],
     [
-      99.5,
-      0,
+      357.2037037037038,
+      -17.778619528619487,
     ],
   ],
   "roughness": 1,
@@ -378,11 +378,11 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to existing t
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 4,
+  "version": 6,
   "versionNonce": Any<Number>,
-  "width": 100,
-  "x": 255,
-  "y": 239,
+  "width": 357.7037037037038,
+  "x": 171,
+  "y": 249.45454545454544,
 }
 `;
 
@@ -482,7 +482,7 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to shapes whe
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 4,
+  "version": 6,
   "versionNonce": Any<Number>,
   "width": 100,
   "x": 255,
@@ -660,7 +660,7 @@ exports[`Test Transform > Test arrow bindings > should bind arrows to text when
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 4,
+  "version": 6,
   "versionNonce": Any<Number>,
   "width": 100,
   "x": 255,
@@ -1505,7 +1505,7 @@ exports[`Test Transform > should transform the elements correctly when linear el
       0,
     ],
     [
-      272.485,
+      270.98528125,
       0,
     ],
   ],
@@ -1526,10 +1526,10 @@ exports[`Test Transform > should transform the elements correctly when linear el
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 4,
+  "version": 7,
   "versionNonce": Any<Number>,
-  "width": 272.985,
-  "x": 111.262,
+  "width": 270.48528125,
+  "x": 112.76171875,
   "y": 57,
 }
 `;
@@ -1587,11 +1587,11 @@ exports[`Test Transform > should transform the elements correctly when linear el
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 4,
+  "version": 6,
   "versionNonce": Any<Number>,
   "width": 0,
-  "x": 77.017,
-  "y": 79,
+  "x": 83.015625,
+  "y": 81.5,
 }
 `;
 

packages/excalidraw/data/transform.test.ts

@@ -779,7 +779,7 @@ describe("Test Transform", () => {
         elementId: "rect-1",
         fixedPoint: null,
         focus: 0,
-        gap: 205,
+        gap: 14,
       });
       expect(rect.boundElements).toStrictEqual([
         {

packages/excalidraw/element/binding.ts

@@ -40,7 +40,6 @@ import {
   isBoundToContainer,
   isElbowArrow,
   isFixedPointBinding,
-  isFrameLikeElement,
   isLinearElement,
   isRectangularElement,
   isTextElement,
@@ -97,6 +96,8 @@ export const isBindingEnabled = (appState: AppState): boolean => {
 };
 
 export const FIXED_BINDING_DISTANCE = 5;
+export const BINDING_HIGHLIGHT_THICKNESS = 10;
+export const BINDING_HIGHLIGHT_OFFSET = 4;
 
 const getNonDeletedElements = (
   scene: Scene,
@@ -213,6 +214,7 @@ const getOriginalBindingIfStillCloseOfLinearElementEdge = (
   linearElement: NonDeleted<ExcalidrawLinearElement>,
   edge: "start" | "end",
   elementsMap: NonDeletedSceneElementsMap,
+  zoom?: AppState["zoom"],
 ): NonDeleted<ExcalidrawElement> | null => {
   const coors = getLinearElementEdgeCoors(linearElement, edge, elementsMap);
   const elementId =
@@ -223,7 +225,7 @@ const getOriginalBindingIfStillCloseOfLinearElementEdge = (
     const element = elementsMap.get(elementId);
     if (
       isBindableElement(element) &&
-      bindingBorderTest(element, coors, elementsMap)
+      bindingBorderTest(element, coors, elementsMap, zoom)
     ) {
       return element;
     }
@@ -235,12 +237,14 @@ const getOriginalBindingIfStillCloseOfLinearElementEdge = (
 const getOriginalBindingsIfStillCloseToArrowEnds = (
   linearElement: NonDeleted<ExcalidrawLinearElement>,
   elementsMap: NonDeletedSceneElementsMap,
+  zoom?: AppState["zoom"],
 ): (NonDeleted<ExcalidrawElement> | null)[] =>
   ["start", "end"].map((edge) =>
     getOriginalBindingIfStillCloseOfLinearElementEdge(
       linearElement,
       edge as "start" | "end",
       elementsMap,
+      zoom,
     ),
   );
 
@@ -250,6 +254,7 @@ const getBindingStrategyForDraggingArrowEndpoints = (
   draggingPoints: readonly number[],
   elementsMap: NonDeletedSceneElementsMap,
   elements: readonly NonDeletedExcalidrawElement[],
+  zoom?: AppState["zoom"],
 ): (NonDeleted<ExcalidrawBindableElement> | null | "keep")[] => {
   const startIdx = 0;
   const endIdx = selectedElement.points.length - 1;
@@ -262,6 +267,7 @@ const getBindingStrategyForDraggingArrowEndpoints = (
           "start",
           elementsMap,
           elements,
+          zoom,
         )
       : null // If binding is disabled and start is dragged, break all binds
     : // We have to update the focus and gap of the binding, so let's rebind
@@ -270,6 +276,7 @@ const getBindingStrategyForDraggingArrowEndpoints = (
         "start",
         elementsMap,
         elements,
+        zoom,
       );
   const end = endDragged
     ? isBindingEnabled
@@ -278,6 +285,7 @@ const getBindingStrategyForDraggingArrowEndpoints = (
           "end",
           elementsMap,
           elements,
+          zoom,
         )
       : null // If binding is disabled and end is dragged, break all binds
     : // We have to update the focus and gap of the binding, so let's rebind
@@ -286,6 +294,7 @@ const getBindingStrategyForDraggingArrowEndpoints = (
         "end",
         elementsMap,
         elements,
+        zoom,
       );
 
   return [start, end];
@@ -296,10 +305,12 @@ const getBindingStrategyForDraggingArrowOrJoints = (
   elementsMap: NonDeletedSceneElementsMap,
   elements: readonly NonDeletedExcalidrawElement[],
   isBindingEnabled: boolean,
+  zoom?: AppState["zoom"],
 ): (NonDeleted<ExcalidrawBindableElement> | null | "keep")[] => {
   const [startIsClose, endIsClose] = getOriginalBindingsIfStillCloseToArrowEnds(
     selectedElement,
     elementsMap,
+    zoom,
   );
   const start = startIsClose
     ? isBindingEnabled
@@ -308,6 +319,7 @@ const getBindingStrategyForDraggingArrowOrJoints = (
           "start",
           elementsMap,
           elements,
+          zoom,
         )
       : null
     : null;
@@ -318,6 +330,7 @@ const getBindingStrategyForDraggingArrowOrJoints = (
           "end",
           elementsMap,
           elements,
+          zoom,
         )
       : null
     : null;
@@ -332,6 +345,7 @@ export const bindOrUnbindLinearElements = (
   scene: Scene,
   isBindingEnabled: boolean,
   draggingPoints: readonly number[] | null,
+  zoom?: AppState["zoom"],
 ): void => {
   selectedElements.forEach((selectedElement) => {
     const [start, end] = draggingPoints?.length
@@ -342,6 +356,7 @@ export const bindOrUnbindLinearElements = (
           draggingPoints ?? [],
           elementsMap,
           elements,
+          zoom,
         )
       : // The arrow itself (the shaft) or the inner joins are dragged
         getBindingStrategyForDraggingArrowOrJoints(
@@ -349,6 +364,7 @@ export const bindOrUnbindLinearElements = (
           elementsMap,
           elements,
           isBindingEnabled,
+          zoom,
         );
 
     bindOrUnbindLinearElement(selectedElement, start, end, elementsMap, scene);
@@ -358,6 +374,7 @@ export const bindOrUnbindLinearElements = (
 export const getSuggestedBindingsForArrows = (
   selectedElements: NonDeleted<ExcalidrawElement>[],
   elementsMap: NonDeletedSceneElementsMap,
+  zoom: AppState["zoom"],
 ): SuggestedBinding[] => {
   // HOT PATH: Bail out if selected elements list is too large
   if (selectedElements.length > 50) {
@@ -368,7 +385,7 @@ export const getSuggestedBindingsForArrows = (
     selectedElements
       .filter(isLinearElement)
       .flatMap((element) =>
-        getOriginalBindingsIfStillCloseToArrowEnds(element, elementsMap),
+        getOriginalBindingsIfStillCloseToArrowEnds(element, elementsMap, zoom),
       )
       .filter(
         (element): element is NonDeleted<ExcalidrawBindableElement> =>
@@ -406,6 +423,7 @@ export const maybeBindLinearElement = (
     pointerCoords,
     elements,
     elementsMap,
+    appState.zoom,
     isElbowArrow(linearElement) && isElbowArrow(linearElement),
   );
 
@@ -422,6 +440,26 @@ export const maybeBindLinearElement = (
   }
 };
 
+const normalizePointBinding = (
+  binding: { focus: number; gap: number },
+  hoveredElement: ExcalidrawBindableElement,
+) => {
+  let gap = binding.gap;
+  const maxGap = maxBindingGap(
+    hoveredElement,
+    hoveredElement.width,
+    hoveredElement.height,
+  );
+
+  if (gap > maxGap) {
+    gap = BINDING_HIGHLIGHT_THICKNESS + BINDING_HIGHLIGHT_OFFSET;
+  }
+  return {
+    ...binding,
+    gap,
+  };
+};
+
 export const bindLinearElement = (
   linearElement: NonDeleted<ExcalidrawLinearElement>,
   hoveredElement: ExcalidrawBindableElement,
@@ -433,11 +471,14 @@ export const bindLinearElement = (
   }
   const binding: PointBinding = {
     elementId: hoveredElement.id,
-    ...calculateFocusAndGap(
-      linearElement,
+    ...normalizePointBinding(
+      calculateFocusAndGap(
+        linearElement,
+        hoveredElement,
+        startOrEnd,
+        elementsMap,
+      ),
       hoveredElement,
-      startOrEnd,
-      elementsMap,
     ),
     ...(isElbowArrow(linearElement)
       ? calculateFixedPointForElbowArrowBinding(
@@ -462,6 +503,12 @@ export const bindLinearElement = (
       }),
     });
   }
+
+  // update bound elements to make sure the binding tips are in sync with
+  // the normalized gap from above
+  if (!isElbowArrow(linearElement)) {
+    updateBoundElements(hoveredElement, elementsMap);
+  }
 };
 
 // Don't bind both ends of a simple segment
@@ -514,6 +561,7 @@ export const getHoveredElementForBinding = (
   },
   elements: readonly NonDeletedExcalidrawElement[],
   elementsMap: NonDeletedSceneElementsMap,
+  zoom?: AppState["zoom"],
   fullShape?: boolean,
 ): NonDeleted<ExcalidrawBindableElement> | null => {
   const hoveredElement = getElementAtPosition(
@@ -524,11 +572,13 @@ export const getHoveredElementForBinding = (
         element,
         pointerCoords,
         elementsMap,
+        zoom,
         // disable fullshape snapping for frame elements so we
         // can bind to frame children
-        fullShape && !isFrameLikeElement(element),
+        fullShape,
       ),
   );
+
   return hoveredElement as NonDeleted<ExcalidrawBindableElement> | null;
 };
 
@@ -578,9 +628,11 @@ export const updateBoundElements = (
     simultaneouslyUpdated?: readonly ExcalidrawElement[];
     newSize?: { width: number; height: number };
     changedElements?: Map<string, OrderedExcalidrawElement>;
+    zoom?: AppState["zoom"];
   },
 ) => {
-  const { newSize, simultaneouslyUpdated, changedElements } = options ?? {};
+  const { newSize, simultaneouslyUpdated, changedElements, zoom } =
+    options ?? {};
   const simultaneouslyUpdatedElementIds = getSimultaneouslyUpdatedElementIds(
     simultaneouslyUpdated,
   );
@@ -670,6 +722,7 @@ export const updateBoundElements = (
       },
       {
         changedElements,
+        zoom,
       },
     );
 
@@ -703,6 +756,7 @@ export const getHeadingForElbowArrowSnap = (
   aabb: Bounds | undefined | null,
   elementsMap: ElementsMap,
   origPoint: GlobalPoint,
+  zoom?: AppState["zoom"],
 ): Heading => {
   const otherPointHeading = vectorToHeading(vectorFromPoint(otherPoint, p));
 
@@ -714,6 +768,7 @@ export const getHeadingForElbowArrowSnap = (
     origPoint,
     bindableElement,
     elementsMap,
+    zoom,
   );
 
   if (!distance) {
@@ -737,6 +792,7 @@ const getDistanceForBinding = (
   point: Readonly<GlobalPoint>,
   bindableElement: ExcalidrawBindableElement,
   elementsMap: ElementsMap,
+  zoom?: AppState["zoom"],
 ) => {
   const distance = distanceToBindableElement(
     bindableElement,
@@ -747,6 +803,7 @@ const getDistanceForBinding = (
     bindableElement,
     bindableElement.width,
     bindableElement.height,
+    zoom,
   );
 
   return distance > bindDistance ? null : distance;
@@ -1174,11 +1231,13 @@ const getElligibleElementForBindingElement = (
   startOrEnd: "start" | "end",
   elementsMap: NonDeletedSceneElementsMap,
   elements: readonly NonDeletedExcalidrawElement[],
+  zoom?: AppState["zoom"],
 ): NonDeleted<ExcalidrawBindableElement> | null => {
   return getHoveredElementForBinding(
     getLinearElementEdgeCoors(linearElement, startOrEnd, elementsMap),
     elements,
     elementsMap,
+    zoom,
   );
 };
 
@@ -1341,9 +1400,11 @@ export const bindingBorderTest = (
   element: NonDeleted<ExcalidrawBindableElement>,
   { x, y }: { x: number; y: number },
   elementsMap: NonDeletedSceneElementsMap,
+  zoom?: AppState["zoom"],
   fullShape?: boolean,
 ): boolean => {
-  const threshold = maxBindingGap(element, element.width, element.height);
+  const threshold = maxBindingGap(element, element.width, element.height, zoom);
+
   const shape = getElementShape(element, elementsMap);
   return (
     isPointOnShape(pointFrom(x, y), shape, threshold) ||
@@ -1356,12 +1417,21 @@ export const maxBindingGap = (
   element: ExcalidrawElement,
   elementWidth: number,
   elementHeight: number,
+  zoom?: AppState["zoom"],
 ): number => {
+  const zoomValue = zoom?.value && zoom.value < 1 ? zoom.value : 1;
+
   // Aligns diamonds with rectangles
   const shapeRatio = element.type === "diamond" ? 1 / Math.sqrt(2) : 1;
   const smallerDimension = shapeRatio * Math.min(elementWidth, elementHeight);
-  // We make the bindable boundary bigger for bigger elements
-  return Math.max(16, Math.min(0.25 * smallerDimension, 32));
+
+  return Math.max(
+    16,
+    // bigger bindable boundary for bigger elements
+    Math.min(0.25 * smallerDimension, 32),
+    // keep in sync with the zoomed highlight
+    BINDING_HIGHLIGHT_THICKNESS / zoomValue + BINDING_HIGHLIGHT_OFFSET,
+  );
 };
 
 export const distanceToBindableElement = (

packages/excalidraw/element/linearElementEditor.ts

@@ -448,6 +448,7 @@ export class LinearElementEditor {
                 ),
                 elements,
                 elementsMap,
+                appState.zoom,
               )
             : null;
 
@@ -787,6 +788,7 @@ export class LinearElementEditor {
           scenePointer,
           elements,
           elementsMap,
+          app.state.zoom,
         ),
       };
 
@@ -911,6 +913,7 @@ export class LinearElementEditor {
           element,
           [points.length - 1],
           elementsMap,
+          app.state.zoom,
         );
       }
       return {
@@ -964,6 +967,7 @@ export class LinearElementEditor {
         element,
         [{ point: newPoint }],
         elementsMap,
+        app.state.zoom,
       );
     }
     return {
@@ -1218,6 +1222,7 @@ export class LinearElementEditor {
     element: NonDeleted<ExcalidrawLinearElement>,
     pointIndices: readonly number[],
     elementsMap: NonDeletedSceneElementsMap | SceneElementsMap,
+    zoom: AppState["zoom"],
   ) {
     let offsetX = 0;
     let offsetY = 0;
@@ -1260,6 +1265,7 @@ export class LinearElementEditor {
     element: NonDeleted<ExcalidrawLinearElement>,
     targetPoints: { point: LocalPoint }[],
     elementsMap: NonDeletedSceneElementsMap | SceneElementsMap,
+    zoom: AppState["zoom"],
   ) {
     const offsetX = 0;
     const offsetY = 0;
@@ -1285,6 +1291,7 @@ export class LinearElementEditor {
     options?: {
       changedElements?: Map<string, OrderedExcalidrawElement>;
       isDragging?: boolean;
+      zoom?: AppState["zoom"];
     },
   ) {
     const { points } = element;
@@ -1337,6 +1344,7 @@ export class LinearElementEditor {
           false,
         ),
         changedElements: options?.changedElements,
+        zoom: options?.zoom,
       },
     );
   }
@@ -1451,6 +1459,7 @@ export class LinearElementEditor {
     options?: {
       changedElements?: Map<string, OrderedExcalidrawElement>;
       isDragging?: boolean;
+      zoom?: AppState["zoom"];
     },
   ) {
     if (isElbowArrow(element)) {
@@ -1487,6 +1496,7 @@ export class LinearElementEditor {
         bindings,
         {
           isDragging: options?.isDragging,
+          zoom: options?.zoom,
         },
       );
     } else {

packages/excalidraw/element/routing.ts

@@ -14,6 +14,7 @@ import {
 import BinaryHeap from "../binaryheap";
 import { getSizeFromPoints } from "../points";
 import { aabbForElement, pointInsideBounds } from "../shapes";
+import type { AppState } from "../types";
 import { isAnyTrue, toBrandedType, tupleToCoors } from "../utils";
 import {
   bindPointToSnapToElementOutline,
@@ -79,6 +80,7 @@ export const mutateElbowArrow = (
   options?: {
     isDragging?: boolean;
     informMutation?: boolean;
+    zoom?: AppState["zoom"];
   },
 ) => {
   const update = updateElbowArrow(
@@ -112,6 +114,7 @@ export const updateElbowArrow = (
     isDragging?: boolean;
     disableBinding?: boolean;
     informMutation?: boolean;
+    zoom?: AppState["zoom"];
   },
 ): ElementUpdate<ExcalidrawElbowArrowElement> | null => {
   const origStartGlobalPoint: GlobalPoint = pointTranslate(
@@ -136,7 +139,12 @@ export const updateElbowArrow = (
     arrow.endBinding &&
     getBindableElementForId(arrow.endBinding.elementId, elementsMap);
   const [hoveredStartElement, hoveredEndElement] = options?.isDragging
-    ? getHoveredElements(origStartGlobalPoint, origEndGlobalPoint, elementsMap)
+    ? getHoveredElements(
+        origStartGlobalPoint,
+        origEndGlobalPoint,
+        elementsMap,
+        options?.zoom,
+      )
     : [startElement, endElement];
   const startGlobalPoint = getGlobalPoint(
     arrow.startBinding?.fixedPoint,
@@ -1072,6 +1080,7 @@ const getHoveredElements = (
   origStartGlobalPoint: GlobalPoint,
   origEndGlobalPoint: GlobalPoint,
   elementsMap: NonDeletedSceneElementsMap | SceneElementsMap,
+  zoom?: AppState["zoom"],
 ) => {
   // TODO: Might be a performance bottleneck and the Map type
   // remembers the insertion order anyway...
@@ -1084,12 +1093,14 @@ const getHoveredElements = (
       tupleToCoors(origStartGlobalPoint),
       elements,
       nonDeletedSceneElementsMap,
+      zoom,
       true,
     ),
     getHoveredElementForBinding(
       tupleToCoors(origEndGlobalPoint),
       elements,
       nonDeletedSceneElementsMap,
+      zoom,
       true,
     ),
   ];

packages/excalidraw/renderer/interactiveScene.ts

@@ -43,7 +43,11 @@ import type {
   SuggestedBinding,
   SuggestedPointBinding,
 } from "../element/binding";
-import { maxBindingGap } from "../element/binding";
+import {
+  BINDING_HIGHLIGHT_OFFSET,
+  BINDING_HIGHLIGHT_THICKNESS,
+  maxBindingGap,
+} from "../element/binding";
 import { LinearElementEditor } from "../element/linearElementEditor";
 import {
   bootstrapCanvas,
@@ -217,17 +221,18 @@ const renderBindingHighlightForBindableElement = (
   context: CanvasRenderingContext2D,
   element: ExcalidrawBindableElement,
   elementsMap: ElementsMap,
+  zoom: InteractiveCanvasAppState["zoom"],
 ) => {
   const [x1, y1, x2, y2] = getElementAbsoluteCoords(element, elementsMap);
   const width = x2 - x1;
   const height = y2 - y1;
-  const thickness = 10;
 
-  // So that we don't overlap the element itself
-  const strokeOffset = 4;
   context.strokeStyle = "rgba(0,0,0,.05)";
-  context.lineWidth = thickness - strokeOffset;
-  const padding = strokeOffset / 2 + thickness / 2;
+  // When zooming out, make line width greater for visibility
+  const zoomValue = zoom.value < 1 ? zoom.value : 1;
+  context.lineWidth = BINDING_HIGHLIGHT_THICKNESS / zoomValue;
+  // To ensure the binding highlight doesn't overlap the element itself
+  const padding = context.lineWidth / 2 + BINDING_HIGHLIGHT_OFFSET;
 
   const radius = getCornerRadius(
     Math.min(element.width, element.height),
@@ -285,6 +290,7 @@ const renderBindingHighlightForSuggestedPointBinding = (
   context: CanvasRenderingContext2D,
   suggestedBinding: SuggestedPointBinding,
   elementsMap: ElementsMap,
+  zoom: InteractiveCanvasAppState["zoom"],
 ) => {
   const [element, startOrEnd, bindableElement] = suggestedBinding;
 
@@ -292,6 +298,7 @@ const renderBindingHighlightForSuggestedPointBinding = (
     bindableElement,
     bindableElement.width,
     bindableElement.height,
+    zoom,
   );
 
   context.strokeStyle = "rgba(0,0,0,0)";
@@ -390,7 +397,7 @@ const renderBindingHighlight = (
 
   context.save();
   context.translate(appState.scrollX, appState.scrollY);
-  renderHighlight(context, suggestedBinding as any, elementsMap);
+  renderHighlight(context, suggestedBinding as any, elementsMap, appState.zoom);
 
   context.restore();
 };

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

@@ -197,7 +197,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "fillStyle": "solid",
   "frameId": null,
   "groupIds": [],
-  "height": 99,
+  "height": 125,
   "id": "id166",
   "index": "a2",
   "isDeleted": false,
@@ -211,8 +211,8 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
       0,
     ],
     [
-      "98.20800",
-      99,
+      125,
+      125,
     ],
   ],
   "roughness": 1,
@@ -226,9 +226,9 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 40,
-  "width": "98.20800",
-  "x": 1,
+  "version": 47,
+  "width": 125,
+  "x": 0,
   "y": 0,
 }
 `;
@@ -298,7 +298,7 @@ History {
                 "focus": "0.00990",
                 "gap": 1,
               },
-              "height": "0.98017",
+              "height": "0.98000",
               "points": [
                 [
                   0,
@@ -306,7 +306,7 @@ History {
                 ],
                 [
                   98,
-                  "-0.98017",
+                  "-0.98000",
                 ],
               ],
               "startBinding": {
@@ -320,10 +320,10 @@ History {
               "endBinding": {
                 "elementId": "id165",
                 "fixedPoint": null,
-                "focus": "-0.02000",
+                "focus": "-0.02040",
                 "gap": 1,
               },
-              "height": "0.00169",
+              "height": "0.02000",
               "points": [
                 [
                   0,
@@ -331,13 +331,13 @@ History {
                 ],
                 [
                   98,
-                  "0.00169",
+                  "0.02000",
                 ],
               ],
               "startBinding": {
                 "elementId": "id164",
                 "fixedPoint": null,
-                "focus": "0.02000",
+                "focus": "0.01959",
                 "gap": 1,
               },
             },
@@ -393,18 +393,20 @@ History {
                 "focus": 0,
                 "gap": 1,
               },
-              "height": 99,
+              "height": 125,
               "points": [
                 [
                   0,
                   0,
                 ],
                 [
-                  "98.20800",
-                  99,
+                  125,
+                  125,
                 ],
               ],
               "startBinding": null,
+              "width": 125,
+              "x": 0,
               "y": 0,
             },
             "inserted": {
@@ -414,7 +416,7 @@ History {
                 "focus": "0.00990",
                 "gap": 1,
               },
-              "height": "0.98161",
+              "height": "0.98000",
               "points": [
                 [
                   0,
@@ -422,7 +424,7 @@ History {
                 ],
                 [
                   98,
-                  "-0.98161",
+                  "-0.98000",
                 ],
               ],
               "startBinding": {
@@ -431,7 +433,9 @@ History {
                 "focus": "0.02970",
                 "gap": 1,
               },
-              "y": "0.99245",
+              "width": 98,
+              "x": 1,
+              "y": "0.99000",
             },
           },
           "id169" => Delta {
@@ -823,9 +827,9 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 30,
-  "width": 0,
-  "x": 200,
+  "version": 37,
+  "width": 100,
+  "x": 150,
   "y": 0,
 }
 `;
@@ -862,6 +866,8 @@ History {
                   0,
                 ],
               ],
+              "width": 0,
+              "x": 149,
             },
             "inserted": {
               "points": [
@@ -870,10 +876,12 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
+              "width": "98.00000",
+              "x": "1.00000",
             },
           },
         },
@@ -930,6 +938,8 @@ History {
                 ],
               ],
               "startBinding": null,
+              "width": 100,
+              "x": 150,
             },
             "inserted": {
               "endBinding": {
@@ -954,6 +964,8 @@ History {
                 "focus": 0,
                 "gap": 1,
               },
+              "width": 0,
+              "x": 149,
             },
           },
         },
@@ -2363,9 +2375,9 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 10,
+  "version": 12,
   "width": 498,
-  "x": 1,
+  "x": "1.00000",
   "y": 0,
 }
 `;
@@ -2504,7 +2516,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -2523,8 +2535,8 @@ History {
               "strokeStyle": "solid",
               "strokeWidth": 2,
               "type": "arrow",
-              "width": 100,
-              "x": 0,
+              "width": "98.00000",
+              "x": 1,
               "y": 0,
             },
             "inserted": {
@@ -15167,9 +15179,9 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 10,
+  "version": 12,
   "width": "98.00000",
-  "x": 1,
+  "x": "1.00000",
   "y": 0,
 }
 `;
@@ -15208,7 +15220,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -15221,7 +15233,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -15517,7 +15529,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -15536,8 +15548,8 @@ History {
               "strokeStyle": "solid",
               "strokeWidth": 2,
               "type": "arrow",
-              "width": 100,
-              "x": 0,
+              "width": "98.00000",
+              "x": 1,
               "y": 0,
             },
             "inserted": {
@@ -15866,9 +15878,9 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 10,
+  "version": 12,
   "width": "98.00000",
-  "x": 1,
+  "x": "1.00000",
   "y": 0,
 }
 `;
@@ -16140,7 +16152,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -16159,8 +16171,8 @@ History {
               "strokeStyle": "solid",
               "strokeWidth": 2,
               "type": "arrow",
-              "width": 100,
-              "x": 0,
+              "width": "98.00000",
+              "x": 1,
               "y": 0,
             },
             "inserted": {
@@ -16489,9 +16501,9 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 10,
+  "version": 12,
   "width": "98.00000",
-  "x": 1,
+  "x": "1.00000",
   "y": 0,
 }
 `;
@@ -16763,7 +16775,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -16782,8 +16794,8 @@ History {
               "strokeStyle": "solid",
               "strokeWidth": 2,
               "type": "arrow",
-              "width": 100,
-              "x": 0,
+              "width": "98.00000",
+              "x": 1,
               "y": 0,
             },
             "inserted": {
@@ -17110,9 +17122,9 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 10,
+  "version": 12,
   "width": "98.00000",
-  "x": 1,
+  "x": "1.00000",
   "y": 0,
 }
 `;
@@ -17168,7 +17180,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -17186,7 +17198,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -17455,7 +17467,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -17474,8 +17486,8 @@ History {
               "strokeStyle": "solid",
               "strokeWidth": 2,
               "type": "arrow",
-              "width": 100,
-              "x": 0,
+              "width": "98.00000",
+              "x": 1,
               "y": 0,
             },
             "inserted": {
@@ -17828,9 +17840,9 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 11,
+  "version": 13,
   "width": "98.00000",
-  "x": 1,
+  "x": "1.00000",
   "y": 0,
 }
 `;
@@ -17901,7 +17913,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -17920,7 +17932,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -18189,7 +18201,7 @@ History {
                   0,
                 ],
                 [
-                  100,
+                  "98.00000",
                   0,
                 ],
               ],
@@ -18208,8 +18220,8 @@ History {
               "strokeStyle": "solid",
               "strokeWidth": 2,
               "type": "arrow",
-              "width": 100,
-              "x": 0,
+              "width": "98.00000",
+              "x": 1,
               "y": 0,
             },
             "inserted": {

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

@@ -173,7 +173,7 @@ exports[`move element > rectangles with binding arrow 6`] = `
   "type": "rectangle",
   "updated": 1,
   "version": 7,
-  "versionNonce": 745419401,
+  "versionNonce": 2066753033,
   "width": 300,
   "x": 201,
   "y": 2,
@@ -232,8 +232,8 @@ exports[`move element > rectangles with binding arrow 7`] = `
   "strokeWidth": 2,
   "type": "arrow",
   "updated": 1,
-  "version": 11,
-  "versionNonce": 1996028265,
+  "version": 15,
+  "versionNonce": 271613161,
   "width": 81,
   "x": 110,
   "y": 50,

packages/excalidraw/tests/history.test.tsx

@@ -4785,21 +4785,17 @@ describe("history", () => {
             expect.objectContaining({ id: rect2.id, boundElements: [] }),
             expect.objectContaining({
               id: arrowId,
-              points: [
-                [0, 0],
-                [100, 0],
-              ],
               startBinding: expect.objectContaining({
                 elementId: rect1.id,
                 fixedPoint: null,
-                focus: expect.toBeNonNaNNumber(),
-                gap: expect.toBeNonNaNNumber(),
+                focus: 0,
+                gap: 1,
               }),
               endBinding: expect.objectContaining({
                 elementId: rect2.id,
                 fixedPoint: null,
-                focus: expect.toBeNonNaNNumber(),
-                gap: expect.toBeNonNaNNumber(),
+                focus: 0,
+                gap: 1,
               }),
               isDeleted: true,
             }),