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 and compatible tile servers.

Before deploying your application, please get yourself familiar with the OpenStreetMap usage policy, and consider donating 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::{Tiles, Map, MapMemory, Position, providers::OpenStreetMap};
use egui::{Context, CentralPanel};
use eframe::{App, Frame};

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

impl MyApp {
    fn new(egui_ctx: Context) -> Self {
        Self {
            tiles: Tiles::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,
                Position::new(17.03664, 51.09916)
            ));
        });
    }
}

You can see a more complete example here.

Running demos

In the future, Walkers will suport numerous build options, such as Android and WASM. They all will share a common library - demo, but most will probably require a different build workflow, not necessarily compatible with Cargo workspaces.

Native

cd demo_native
cargo run

Web / WASM

cargo install trunk
cd demo_web
trunk serve --release