refactor(edges): siplify edge path / label position handling, repair edge labels

examples/vite-app/src/examples/EdgeRouting/index.tsx

@@ -77,10 +77,6 @@ const edges: Edge[] = [
     id: 'e1-2',
     source: '1',
     target: '2',
-    type: 'smoothstep',
-    markerEnd: {
-      type: MarkerType.ArrowClosed,
-    },
     pathOptions: {
       offset: 30,
     },
@@ -90,10 +86,6 @@ const edges: Edge[] = [
     id: 'e3-4',
     source: '3',
     target: '4',
-    type: 'smoothstep',
-    markerEnd: {
-      type: MarkerType.ArrowClosed,
-    },
     pathOptions: {
       borderRadius: 2,
     },
@@ -104,24 +96,21 @@ const edges: Edge[] = [
     id: 'e4-5',
     source: '5',
     target: '6',
-    type: 'smoothstep',
-    markerEnd: {
-      type: MarkerType.ArrowClosed,
-    },
   },
 
   {
     id: 'e7-8',
     source: '7',
     target: '8',
-    type: 'smoothstep',
-    markerEnd: {
-      type: MarkerType.ArrowClosed,
-    },
   },
 ];
 
 const defaultEdgeOptions = {
+  label: 'Edge Label',
+  type: 'default',
+  markerEnd: {
+    type: MarkerType.ArrowClosed,
+  },
   style: {
     strokeWidth: 1,
   },

examples/vite-app/src/examples/Edges/CustomEdge.tsx

@@ -1,4 +1,4 @@
-import React, { FC } from 'react';
+import { FC } from 'react';
 import { EdgeProps, getBezierPath } from 'reactflow';
 
 const CustomEdge: FC<EdgeProps> = ({
@@ -11,7 +11,7 @@ const CustomEdge: FC<EdgeProps> = ({
   targetPosition,
   data,
 }) => {
-  const edgePath = getBezierPath({
+  const [edgePath] = getBezierPath({
     sourceX,
     sourceY,
     sourcePosition,

examples/vite-app/src/examples/Edges/CustomEdge2.tsx

@@ -1,5 +1,5 @@
-import React, { FC } from 'react';
-import { EdgeProps, getBezierPath, EdgeText, getBezierEdgeCenter } from 'reactflow';
+import { FC } from 'react';
+import { EdgeProps, getBezierPath, EdgeText } from 'reactflow';
 
 const CustomEdge: FC<EdgeProps> = ({
   id,
@@ -11,7 +11,7 @@ const CustomEdge: FC<EdgeProps> = ({
   targetPosition,
   data,
 }) => {
-  const edgePath = getBezierPath({
+  const [edgePath, labelX, labelY] = getBezierPath({
     sourceX,
     sourceY,
     sourcePosition,
@@ -19,19 +19,13 @@ const CustomEdge: FC<EdgeProps> = ({
     targetY,
     targetPosition,
   });
-  const [centerX, centerY] = getBezierEdgeCenter({
-    sourceX,
-    sourceY,
-    targetX,
-    targetY,
-  });
 
   return (
     <>
       <path id={id} className="react-flow__edge-path" d={edgePath} />
       <EdgeText
-        x={centerX}
-        y={centerY}
+        x={labelX}
+        y={labelY}
         label={data.text}
         labelStyle={{ fill: 'white' }}
         labelShowBg

packages/core/src/components/ConnectionLine/index.tsx

@@ -97,16 +97,16 @@ const ConnectionLine = ({
 
   if (connectionLineType === ConnectionLineType.Bezier) {
     // we assume the destination position is opposite to the source position
-    dAttr = getBezierPath(pathParams);
+    [dAttr] = getBezierPath(pathParams);
   } else if (connectionLineType === ConnectionLineType.Step) {
-    dAttr = getSmoothStepPath({
+    [dAttr] = getSmoothStepPath({
       ...pathParams,
       borderRadius: 0,
     });
   } else if (connectionLineType === ConnectionLineType.SmoothStep) {
-    dAttr = getSmoothStepPath(pathParams);
+    [dAttr] = getSmoothStepPath(pathParams);
   } else if (connectionLineType === ConnectionLineType.SimpleBezier) {
-    dAttr = getSimpleBezierPath(pathParams);
+    [dAttr] = getSimpleBezierPath(pathParams);
   } else {
     dAttr = `M${fromX},${fromY} ${toX},${toY}`;
   }

packages/core/src/components/Edges/BaseEdge.tsx

@@ -3,8 +3,8 @@ import { BaseEdgeProps } from '../../types';
 
 const BaseEdge = ({
   path,
-  centerX,
-  centerY,
+  labelX,
+  labelY,
   label,
   labelStyle,
   labelShowBg,
@@ -29,8 +29,8 @@ const BaseEdge = ({
       {interactionWidth && <path d={path} fill="none" strokeOpacity={0} strokeWidth={interactionWidth} />}
       {label ? (
         <EdgeText
-          x={centerX}
-          y={centerY}
+          x={labelX}
+          y={labelY}
           label={label}
           labelStyle={labelStyle}
           labelShowBg={labelShowBg}

packages/core/src/components/Edges/BezierEdge.tsx

@@ -1,6 +1,7 @@
 import { memo } from 'react';
 import { BezierEdgeProps, Position } from '../../types';
 import BaseEdge from './BaseEdge';
+import { getBezierEdgeCenter } from './utils';
 
 export interface GetBezierPathParams {
   sourceX: number;
@@ -68,7 +69,7 @@ export function getBezierPath({
   targetY,
   targetPosition = Position.Top,
   curvature = 0.25,
-}: GetBezierPathParams): string {
+}: GetBezierPathParams): [string, number, number, number, number] {
   const [sourceControlX, sourceControlY] = getControlWithCurvature({
     pos: sourcePosition,
     x1: sourceX,
@@ -85,45 +86,24 @@ export function getBezierPath({
     y2: sourceY,
     c: curvature,
   });
-  return `M${sourceX},${sourceY} C${sourceControlX},${sourceControlY} ${targetControlX},${targetControlY} ${targetX},${targetY}`;
-}
+  const [centerX, centerY, offsetX, offsetY] = getBezierEdgeCenter({
+    sourceX,
+    sourceY,
+    targetX,
+    targetY,
+    sourceControlX,
+    sourceControlY,
+    targetControlX,
+    targetControlY,
+  });
 
-// @TODO: this function will recalculate the control points
-// one option is to let getXXXPath() return center points
-// but will introduce breaking changes
-// the getCenter() of other types of edges might need to change, too
-export function getBezierCenter({
-  sourceX,
-  sourceY,
-  sourcePosition = Position.Bottom,
-  targetX,
-  targetY,
-  targetPosition = Position.Top,
-  curvature = 0.25,
-}: GetBezierPathParams): [number, number, number, number] {
-  const [sourceControlX, sourceControlY] = getControlWithCurvature({
-    pos: sourcePosition,
-    x1: sourceX,
-    y1: sourceY,
-    x2: targetX,
-    y2: targetY,
-    c: curvature,
-  });
-  const [targetControlX, targetControlY] = getControlWithCurvature({
-    pos: targetPosition,
-    x1: targetX,
-    y1: targetY,
-    x2: sourceX,
-    y2: sourceY,
-    c: curvature,
-  });
-  // cubic bezier t=0.5 mid point, not the actual mid point, but easy to calculate
-  // https://stackoverflow.com/questions/67516101/how-to-find-distance-mid-point-of-bezier-curve
-  const centerX = sourceX * 0.125 + sourceControlX * 0.375 + targetControlX * 0.375 + targetX * 0.125;
-  const centerY = sourceY * 0.125 + sourceControlY * 0.375 + targetControlY * 0.375 + targetY * 0.125;
-  const xOffset = Math.abs(centerX - sourceX);
-  const yOffset = Math.abs(centerY - sourceY);
-  return [centerX, centerY, xOffset, yOffset];
+  return [
+    `M${sourceX},${sourceY} C${sourceControlX},${sourceControlY} ${targetControlX},${targetControlY} ${targetX},${targetY}`,
+    centerX,
+    centerY,
+    offsetX,
+    offsetY,
+  ];
 }
 
 const BezierEdge = memo(
@@ -146,7 +126,7 @@ const BezierEdge = memo(
     pathOptions,
     interactionWidth,
   }: BezierEdgeProps) => {
-    const params = {
+    const [path, labelX, labelY] = getBezierPath({
       sourceX,
       sourceY,
       sourcePosition,
@@ -154,15 +134,13 @@ const BezierEdge = memo(
       targetY,
       targetPosition,
       curvature: pathOptions?.curvature,
-    };
-    const path = getBezierPath(params);
-    const [centerX, centerY] = getBezierCenter(params);
+    });
 
     return (
       <BaseEdge
         path={path}
-        centerX={centerX}
-        centerY={centerY}
+        labelX={labelX}
+        labelY={labelY}
         label={label}
         labelStyle={labelStyle}
         labelShowBg={labelShowBg}

packages/core/src/components/Edges/SimpleBezierEdge.tsx

@@ -1,6 +1,7 @@
 import { memo } from 'react';
 import { EdgeProps, Position } from '../../types';
 import BaseEdge from './BaseEdge';
+import { getBezierEdgeCenter } from './utils';
 
 export interface GetSimpleBezierPathParams {
   sourceX: number;
@@ -47,7 +48,7 @@ export function getSimpleBezierPath({
   targetX,
   targetY,
   targetPosition = Position.Top,
-}: GetSimpleBezierPathParams): string {
+}: GetSimpleBezierPathParams): [string, number, number, number, number] {
   const [sourceControlX, sourceControlY] = getControl({
     pos: sourcePosition,
     x1: sourceX,
@@ -62,42 +63,24 @@ export function getSimpleBezierPath({
     x2: sourceX,
     y2: sourceY,
   });
-  return `M${sourceX},${sourceY} C${sourceControlX},${sourceControlY} ${targetControlX},${targetControlY} ${targetX},${targetY}`;
-}
+  const [centerX, centerY, offsetX, offsetY] = getBezierEdgeCenter({
+    sourceX,
+    sourceY,
+    targetX,
+    targetY,
+    sourceControlX,
+    sourceControlY,
+    targetControlX,
+    targetControlY,
+  });
 
-// @TODO: this function will recalculate the control points
-// one option is to let getXXXPath() return center points
-// but will introduce breaking changes
-// the getCenter() of other types of edges might need to change, too
-export function getSimpleBezierCenter({
-  sourceX,
-  sourceY,
-  sourcePosition = Position.Bottom,
-  targetX,
-  targetY,
-  targetPosition = Position.Top,
-}: GetSimpleBezierPathParams): [number, number, number, number] {
-  const [sourceControlX, sourceControlY] = getControl({
-    pos: sourcePosition,
-    x1: sourceX,
-    y1: sourceY,
-    x2: targetX,
-    y2: targetY,
-  });
-  const [targetControlX, targetControlY] = getControl({
-    pos: targetPosition,
-    x1: targetX,
-    y1: targetY,
-    x2: sourceX,
-    y2: sourceY,
-  });
-  // cubic bezier t=0.5 mid point, not the actual mid point, but easy to calculate
-  // https://stackoverflow.com/questions/67516101/how-to-find-distance-mid-point-of-bezier-curve
-  const centerX = sourceX * 0.125 + sourceControlX * 0.375 + targetControlX * 0.375 + targetX * 0.125;
-  const centerY = sourceY * 0.125 + sourceControlY * 0.375 + targetControlY * 0.375 + targetY * 0.125;
-  const xOffset = Math.abs(centerX - sourceX);
-  const yOffset = Math.abs(centerY - sourceY);
-  return [centerX, centerY, xOffset, yOffset];
+  return [
+    `M${sourceX},${sourceY} C${sourceControlX},${sourceControlY} ${targetControlX},${targetControlY} ${targetX},${targetY}`,
+    centerX,
+    centerY,
+    offsetX,
+    offsetY,
+  ];
 }
 
 const SimpleBezierEdge = memo(
@@ -119,22 +102,20 @@ const SimpleBezierEdge = memo(
     markerStart,
     interactionWidth,
   }: EdgeProps) => {
-    const params = {
+    const [path, labelX, labelY] = getSimpleBezierPath({
       sourceX,
       sourceY,
       sourcePosition,
       targetX,
       targetY,
       targetPosition,
-    };
-    const path = getSimpleBezierPath(params);
-    const [centerX, centerY] = getSimpleBezierCenter(params);
+    });
 
     return (
       <BaseEdge
         path={path}
-        centerX={centerX}
-        centerY={centerY}
+        labelX={labelX}
+        labelY={labelY}
         label={label}
         labelStyle={labelStyle}
         labelShowBg={labelShowBg}

packages/core/src/components/Edges/SmoothStepEdge.tsx

@@ -1,8 +1,8 @@
 import { memo } from 'react';
 
-import { getCenter } from './utils';
 import { SmoothStepEdgeProps, Position, XYPosition } from '../../types';
 import BaseEdge from './BaseEdge';
+import { getSimpleEdgeCenter } from './utils';
 
 export interface GetSmoothStepPathParams {
   sourceX: number;
@@ -55,9 +55,9 @@ function getPoints({
   sourcePosition: Position;
   target: XYPosition;
   targetPosition: Position;
-  center: XYPosition;
+  center: Partial<XYPosition>;
   offset: number;
-}): XYPosition[] {
+}): [XYPosition[], number, number, number, number] {
   const sourceDir = handleDirections[sourcePosition];
   const targetDir = handleDirections[targetPosition];
   const sourceGapped: XYPosition = { x: source.x + sourceDir.x * offset, y: source.y + sourceDir.y * offset };
@@ -71,22 +71,31 @@ function getPoints({
   const currDir = dir[dirAccessor];
 
   let points: XYPosition[] = [];
+  let centerX, centerY;
+  const [defaultCenterX, defaultCenterY, defaultOffsetX, defaultOffsetY] = getSimpleEdgeCenter({
+    sourceX: source.x,
+    sourceY: source.y,
+    targetX: target.x,
+    targetY: target.y,
+  });
 
   // opposite handle positions, default case
   if (sourceDir[dirAccessor] * targetDir[dirAccessor] === -1) {
+    centerX = center.x || defaultCenterX;
+    centerY = center.y || defaultCenterY;
     //    --->
     //    |
     // >---
     const verticalSplit: XYPosition[] = [
-      { x: center.x, y: sourceGapped.y },
-      { x: center.x, y: targetGapped.y },
+      { x: centerX, y: sourceGapped.y },
+      { x: centerX, y: targetGapped.y },
     ];
     //    |
     //  ---
     //  |
     const horizontalSplit: XYPosition[] = [
-      { x: sourceGapped.x, y: center.y },
-      { x: targetGapped.x, y: center.y },
+      { x: sourceGapped.x, y: centerY },
+      { x: targetGapped.x, y: centerY },
     ];
 
     if (sourceDir[dirAccessor] === currDir) {
@@ -119,9 +128,14 @@ function getPoints({
         points = dirAccessor === 'x' ? sourceTarget : targetSource;
       }
     }
+
+    centerX = points[0].x;
+    centerY = points[0].y;
   }
 
-  return [source, sourceGapped, ...points, targetGapped, target];
+  const pathPoints = [source, sourceGapped, ...points, targetGapped, target];
+
+  return [pathPoints, centerX, centerY, defaultOffsetX, defaultOffsetY];
 }
 
 function getBend(a: XYPosition, b: XYPosition, c: XYPosition, size: number): string {
@@ -156,21 +170,17 @@ export function getSmoothStepPath({
   centerX,
   centerY,
   offset = 20,
-}: GetSmoothStepPathParams): string {
-  const [_centerX, _centerY] = getCenter({ sourceX, sourceY, targetX, targetY });
-  const cX = typeof centerX !== 'undefined' ? centerX : _centerX;
-  const cY = typeof centerY !== 'undefined' ? centerY : _centerY;
-
-  const points = getPoints({
+}: GetSmoothStepPathParams): [string, number, number, number, number] {
+  const [points, labelX, labelY, offsetX, offsetY] = getPoints({
     source: { x: sourceX, y: sourceY },
     sourcePosition,
     target: { x: targetX, y: targetY },
     targetPosition,
-    center: { x: cX, y: cY },
+    center: { x: centerX, y: centerY },
     offset,
   });
 
-  return points.reduce<string>((res, p, i) => {
+  const path = points.reduce<string>((res, p, i) => {
     let segment = '';
 
     if (i > 0 && i < points.length - 1) {
@@ -183,6 +193,8 @@ export function getSmoothStepPath({
 
     return res;
   }, '');
+
+  return [path, labelX, labelY, offsetX, offsetY];
 }
 
 const SmoothStepEdge = memo(
@@ -205,9 +217,7 @@ const SmoothStepEdge = memo(
     pathOptions,
     interactionWidth,
   }: SmoothStepEdgeProps) => {
-    const [centerX, centerY] = getCenter({ sourceX, sourceY, targetX, targetY, sourcePosition, targetPosition });
-
-    const path = getSmoothStepPath({
+    const [path, labelX, labelY] = getSmoothStepPath({
       sourceX,
       sourceY,
       sourcePosition,
@@ -221,8 +231,8 @@ const SmoothStepEdge = memo(
     return (
       <BaseEdge
         path={path}
-        centerX={centerX}
-        centerY={centerY}
+        labelX={labelX}
+        labelY={labelY}
         label={label}
         labelStyle={labelStyle}
         labelShowBg={labelShowBg}

packages/core/src/components/Edges/StraightEdge.tsx

@@ -2,6 +2,30 @@ import { memo } from 'react';
 
 import BaseEdge from './BaseEdge';
 import { EdgeProps } from '../../types';
+import { getSimpleEdgeCenter } from './utils';
+
+export type GetStraightPathParams = {
+  sourceX: number;
+  sourceY: number;
+  targetX: number;
+  targetY: number;
+};
+
+export function getStraightPath({
+  sourceX,
+  sourceY,
+  targetX,
+  targetY,
+}: GetStraightPathParams): [string, number, number, number, number] {
+  const [centerX, centerY, offsetX, offsetY] = getSimpleEdgeCenter({
+    sourceX,
+    sourceY,
+    targetX,
+    targetY,
+  });
+
+  return [`M ${sourceX},${sourceY}L ${targetX},${targetY}`, centerX, centerY, offsetX, offsetY];
+}
 
 const StraightEdge = memo(
   ({
@@ -20,17 +44,13 @@ const StraightEdge = memo(
     markerStart,
     interactionWidth,
   }: EdgeProps) => {
-    const yOffset = Math.abs(targetY - sourceY) / 2;
-    const centerY = targetY < sourceY ? targetY + yOffset : targetY - yOffset;
-
-    const xOffset = Math.abs(targetX - sourceX) / 2;
-    const centerX = targetX < sourceX ? targetX + xOffset : targetX - xOffset;
+    const [path, labelX, labelY] = getStraightPath({ sourceX, sourceY, targetX, targetY });
 
     return (
       <BaseEdge
-        path={`M ${sourceX},${sourceY}L ${targetX},${targetY}`}
-        centerX={centerX}
-        centerY={centerY}
+        path={path}
+        labelX={labelX}
+        labelY={labelY}
         label={label}
         labelStyle={labelStyle}
         labelShowBg={labelShowBg}

packages/core/src/components/Edges/utils.ts

@@ -1,7 +1,7 @@
 import { MouseEvent as ReactMouseEvent } from 'react';
 import { StoreApi } from 'zustand';
 
-import { Edge, MarkerType, Position, ReactFlowState } from '../../types';
+import { Edge, MarkerType, ReactFlowState } from '../../types';
 
 export const getMarkerEnd = (markerType?: MarkerType, markerEndId?: string): string => {
   if (typeof markerEndId !== 'undefined' && markerEndId) {
@@ -11,51 +11,6 @@ export const getMarkerEnd = (markerType?: MarkerType, markerEndId?: string): str
   return typeof markerType !== 'undefined' ? `url(#react-flow__${markerType})` : 'none';
 };
 
-export interface GetCenterParams {
-  sourceX: number;
-  sourceY: number;
-  targetX: number;
-  targetY: number;
-  sourcePosition?: Position;
-  targetPosition?: Position;
-}
-
-const LeftOrRight = [Position.Left, Position.Right];
-
-export const getCenter = ({
-  sourceX,
-  sourceY,
-  targetX,
-  targetY,
-  sourcePosition = Position.Bottom,
-  targetPosition = Position.Top,
-}: GetCenterParams): [number, number, number, number] => {
-  const sourceIsLeftOrRight = LeftOrRight.includes(sourcePosition);
-  const targetIsLeftOrRight = LeftOrRight.includes(targetPosition);
-
-  // we expect flows to be horizontal or vertical (all handles left or right respectively top or bottom)
-  // a mixed edge is when one the source is on the left and the target is on the top for example.
-  const mixedEdge = (sourceIsLeftOrRight && !targetIsLeftOrRight) || (targetIsLeftOrRight && !sourceIsLeftOrRight);
-
-  if (mixedEdge) {
-    const xOffset = sourceIsLeftOrRight ? Math.abs(targetX - sourceX) : 0;
-    const centerX = sourceX > targetX ? sourceX - xOffset : sourceX + xOffset;
-
-    const yOffset = sourceIsLeftOrRight ? 0 : Math.abs(targetY - sourceY);
-    const centerY = sourceY < targetY ? sourceY + yOffset : sourceY - yOffset;
-
-    return [centerX, centerY, xOffset, yOffset];
-  }
-
-  const xOffset = Math.abs(targetX - sourceX) / 2;
-  const centerX = targetX < sourceX ? targetX + xOffset : targetX - xOffset;
-
-  const yOffset = Math.abs(targetY - sourceY) / 2;
-  const centerY = targetY < sourceY ? targetY + yOffset : targetY - yOffset;
-
-  return [centerX, centerY, xOffset, yOffset];
-};
-
 export function getMouseHandler(
   id: string,
   getState: StoreApi<ReactFlowState>['getState'],
@@ -71,3 +26,53 @@ export function getMouseHandler(
         }
       };
 }
+
+// this is used for straight edges and simple smoothstep edges (LTR, RTL, BTT, TTB)
+export function getSimpleEdgeCenter({
+  sourceX,
+  sourceY,
+  targetX,
+  targetY,
+}: {
+  sourceX: number;
+  sourceY: number;
+  targetX: number;
+  targetY: number;
+}): [number, number, number, number] {
+  const xOffset = Math.abs(targetX - sourceX) / 2;
+  const centerX = targetX < sourceX ? targetX + xOffset : targetX - xOffset;
+
+  const yOffset = Math.abs(targetY - sourceY) / 2;
+  const centerY = targetY < sourceY ? targetY + yOffset : targetY - yOffset;
+
+  return [centerX, centerY, xOffset, yOffset];
+}
+
+export function getBezierEdgeCenter({
+  sourceX,
+  sourceY,
+  targetX,
+  targetY,
+  sourceControlX,
+  sourceControlY,
+  targetControlX,
+  targetControlY,
+}: {
+  sourceX: number;
+  sourceY: number;
+  targetX: number;
+  targetY: number;
+  sourceControlX: number;
+  sourceControlY: number;
+  targetControlX: number;
+  targetControlY: number;
+}): [number, number, number, number] {
+  // cubic bezier t=0.5 mid point, not the actual mid point, but easy to calculate
+  // https://stackoverflow.com/questions/67516101/how-to-find-distance-mid-point-of-bezier-curve
+  const centerX = sourceX * 0.125 + sourceControlX * 0.375 + targetControlX * 0.375 + targetX * 0.125;
+  const centerY = sourceY * 0.125 + sourceControlY * 0.375 + targetControlY * 0.375 + targetY * 0.125;
+  const offsetX = Math.abs(centerX - sourceX);
+  const offsetY = Math.abs(centerY - sourceY);
+
+  return [centerX, centerY, offsetX, offsetY];
+}

packages/core/src/index.ts

@@ -1,18 +1,10 @@
 export { default as ReactFlow } from './container/ReactFlow';
 export { default as Handle } from './components/Handle';
 export { default as EdgeText } from './components/Edges/EdgeText';
-export { default as StraightEdge } from './components/Edges/StraightEdge';
+export { default as StraightEdge, getStraightPath } from './components/Edges/StraightEdge';
 export { default as StepEdge } from './components/Edges/StepEdge';
-export {
-  default as BezierEdge,
-  getBezierPath,
-  getBezierCenter as getBezierEdgeCenter,
-} from './components/Edges/BezierEdge';
-export {
-  default as SimpleBezierEdge,
-  getSimpleBezierPath,
-  getSimpleBezierCenter as getSimpleBezierEdgeCenter,
-} from './components/Edges/SimpleBezierEdge';
+export { default as BezierEdge, getBezierPath } from './components/Edges/BezierEdge';
+export { default as SimpleBezierEdge, getSimpleBezierPath } from './components/Edges/SimpleBezierEdge';
 export { default as SmoothStepEdge, getSmoothStepPath } from './components/Edges/SmoothStepEdge';
 export { default as BaseEdge } from './components/Edges/BaseEdge';
 
@@ -29,7 +21,7 @@ export {
   getRectOfNodes,
 } from './utils/graph';
 export { applyNodeChanges, applyEdgeChanges } from './utils/changes';
-export { getMarkerEnd, getCenter as getEdgeCenter } from './components/Edges/utils';
+export { getMarkerEnd } from './components/Edges/utils';
 export { default as ReactFlowProvider } from './components/ReactFlowProvider';
 export { default as Panel } from './components/Panel';
 

packages/core/src/types/edges.ts

@@ -104,8 +104,8 @@ export type BaseEdgeProps = Pick<
   | 'markerEnd'
   | 'interactionWidth'
 > & {
-  centerX: number;
-  centerY: number;
+  labelX: number;
+  labelY: number;
   path: string;
 };