@map-gesture-controls/leaflet

Control Leaflet maps with hand gestures. No mouse, no touch, no backend. Point your webcam and use a fist or pinch to pan, zoom, and rotate. Powered by MediaPipe hand-tracking running entirely in the browser. Your camera feed never leaves the device.

Part of the map-gesture-controls monorepo.

Demo

Try it live at sanderdesnaijer.github.io/map-gesture-controls

Install

npm install @map-gesture-controls/leaflet leaflet

leaflet is a peer dependency. You must install it separately.

For TypeScript support:

npm install -D @types/leaflet

Quick start

import L from 'leaflet';
import 'leaflet/dist/leaflet.css';
import { GestureMapController } from '@map-gesture-controls/leaflet';
import '@map-gesture-controls/leaflet/style.css';

const map = L.map('map').setView([52.37, 4.9], 10);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
  attribution:
    '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
}).addTo(map);

const controller = new GestureMapController({ map });

// Must be called from a user gesture (e.g. button click) for webcam permission
document.getElementById('start-btn')!.addEventListener('click', async () => {
  await controller.start();
});

document.getElementById('stop-btn')!.addEventListener('click', () => {
  controller.stop();
});

Important: consumers must import Leaflet's own CSS separately: leaflet/dist/leaflet.css.

How it works

1. Webcam capture - GestureController opens the camera and feeds each frame to MediaPipe Hand Landmarker, returning 21 3D landmarks per hand.
2. Gesture classification - GestureStateMachine classifies frames in real time: left fist or pinch = pan, right fist or pinch = zoom (vertical movement), both hands active = rotate, anything else is idle. Dwell timers and grace periods prevent accidental triggers.
3. Map integration - LeafletGestureInteraction translates hand movement deltas into Leaflet panBy() calls for pan, Leaflet's continuous zoom update path for zoom, and a CSS transform on a dedicated rotate pane for rotation. During gesture zoom, the current tile level stays stretched while the next tiles load. Pan direction is counter-rotated by the current bearing so gesture direction always matches what you see on screen.

Gestures

Both fist and pinch (thumb and index finger touching) trigger the same actions, use whichever feels more comfortable.

Rotation is implemented via CSS transforms on a dedicated pane inside .leaflet-map-pane since Leaflet core has no native rotation API. Only tile and overlay panes rotate; marker, shadow, tooltip, and popup panes remain axis-aligned.

Configuration

All options are optional. Defaults work well out of the box.

const controller = new GestureMapController({
  map,
  webcam: {
    position: 'bottom-left',
    width: 200,
    height: 150,
    opacity: 0.6,
  },
  tuning: {
    actionDwellMs: 40,
    releaseGraceMs: 80,
    panDeadzonePx: 0,
    smoothingAlpha: 0.35,
  },
  debug: true,
});

See the full configuration reference for all webcam and tuning options.

Exports

This package re-exports the entire @map-gesture-controls/core API, so you only need one import. On top of core, it adds:

Use cases

• Museum and exhibit kiosks - visitors explore maps without touching a shared screen
• Accessibility - hands-free map navigation for users with limited mobility
• Live presentations - control a projected map from across the room
• Public displays - touchless interaction in medical, retail, or transit environments

Requirements

• Leaflet 1.x (leaflet as a peer dependency)
• A modern browser with WebGL, getUserMedia, and WASM support
• Chrome 111+, Edge 111+, Firefox 115+, Safari 17+

Related packages

Documentation

Full docs, live demos, and API reference at sanderdesnaijer.github.io/map-gesture-controls

Privacy

All gesture processing runs locally in the browser. No video data is sent to any server. MediaPipe WASM and model files are loaded from public CDNs.

Built by Sander de Snaijer.

License

MIT