add inverse pan to minimap

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

@@ -1,4 +1,4 @@
-import { MouseEvent, useCallback } from 'react';
+import { MouseEvent, useCallback, useState } from "react";
 import ReactFlow, {
   MiniMap,
   Background,
@@ -87,6 +87,7 @@ const defaultEdgeOptions = { zIndex: 0 };
 
 const BasicFlow = () => {
   const instance = useReactFlow();
+  const [inverse, setInverse] = useState(false);
 
   const updatePos = () => {
     instance.setNodes((nodes) =>
@@ -137,7 +138,8 @@ const BasicFlow = () => {
       fitView
     >
       <Background variant={BackgroundVariant.Dots} />
-      <MiniMap onClick={onMiniMapClick} onNodeClick={onMiniMapNodeClick} pannable zoomable />
+      <MiniMap onClick={onMiniMapClick} onNodeClick={onMiniMapNodeClick} pannable zoomable
+               inversePan={inverse}/>
       <Controls />
 
       <div style={{ position: 'absolute', right: 10, top: 10, zIndex: 4 }}>
@@ -151,6 +153,7 @@ const BasicFlow = () => {
           toggle classnames
         </button>
         <button onClick={logToObject}>toObject</button>
+        <button onClick={_ => setInverse(!inverse)}>{inverse ? 'un-inverse pan' : 'inverse pan'}</button>
       </div>
     </ReactFlow>
   );

packages/minimap/src/MiniMap.tsx

@@ -67,6 +67,7 @@ function MiniMap({
   pannable = false,
   zoomable = false,
   ariaLabel = 'React Flow mini map',
+  inversePan = false
 }: MiniMapProps) {
   const store = useStoreApi();
   const svg = useRef<SVGSVGElement>(null);
@@ -120,9 +121,10 @@ function MiniMap({
         }
 
         // @TODO: how to calculate the correct next position? Math.max(1, transform[2]) is a workaround.
+        const moveScale = viewScaleRef.current * Math.max(1, transform[2]) * (inversePan ? -1 : 1);
         const position = {
-          x: transform[0] - event.sourceEvent.movementX * viewScaleRef.current * Math.max(1, transform[2]),
-          y: transform[1] - event.sourceEvent.movementY * viewScaleRef.current * Math.max(1, transform[2]),
+          x: transform[0] - event.sourceEvent.movementX * moveScale,
+          y: transform[1] - event.sourceEvent.movementY * moveScale,
         };
         const extent: CoordinateExtent = [
           [0, 0],

packages/minimap/src/types.ts

@@ -20,6 +20,7 @@ export type MiniMapProps<NodeData = any> = Omit<HTMLAttributes<SVGSVGElement>, '
   pannable?: boolean;
   zoomable?: boolean;
   ariaLabel?: string | null;
+  inversePan?: boolean;
 };
 
 export interface MiniMapNodeProps {