Walkers, a map widget for Rust

Walkers is a slippy maps widget for egui, similar to very popular Leaflet, but written in Rust. It compiles to native applications as well as WASM. See the online demo here.

It supports OpenStreetMap, mapbox, and compatible tile servers. There is also experimental support for off-line vector tiles using the PMTiles format.

Before deploying your application, please get yourself familiar with the OpenStreetMap usage policy, and consider donating to the OpenStreetMap Foundation.

Quick start

Walkers has three main objects. Tiles downloads images from a tile map provider such as OpenStreetMap and stores them in a cache, MapMemory keeps track of the widget's state and Map is the widget itself.

use walkers::{HttpTiles, Map, MapMemory, Position, sources::OpenStreetMap, lon_lat};
use egui::{Context, CentralPanel};
use eframe::{App, Frame};

struct MyApp {
    tiles: HttpTiles,
    map_memory: MapMemory,
}

impl MyApp {
    fn new(egui_ctx: Context) -> Self {
        Self {
            tiles: HttpTiles::new(OpenStreetMap, egui_ctx),
            map_memory: MapMemory::default(),
        }
    }
}

impl App for MyApp {
    fn update(&mut self, ctx: &Context, _frame: &mut Frame) {
        CentralPanel::default().show(ctx, |ui| {
            ui.add(Map::new(
                Some(&mut self.tiles),
                &mut self.map_memory,
                lon_lat(17.03664, 51.09916)
            ));
        });
    }
}

You can see a more complete example here.

Running demos

Walkers supports numerous build options, such as Android and WASM. They all share a common library - demo, but require a different build workflow, not necessarily compatible with Cargo alone.

Native

cargo run

To see vector maps support in action, you need to obtain some .pmtiles files and put them into the directory from where you run the demo. One way of doing that is to download an extract from Protonmaps.

pmtiles extract https://build.protomaps.com/20250928.pmtiles --bbox 16.802768,51.036355,17.209205,51.180686 wroclaw.pmtiles

To enable mapbox layers, you need to define MAPBOX_ACCESS_TOKEN environment variable before building. You can get one by creating a mapbox account.

Web / WASM

cd demo_web
trunk serve --release

Android

You need to have Android SDK and cargo-ndk installed.

cd demo_android
make run-on-device