movingai-rust

Map/Scenario Parser for the MovingAI benchmark format. It offers a quick way to parse scenario and map files, plus some map utility to manage and query information from them.

Map Features

The create not only parse a map and scene file, it also provide an object for easy interacting with it.

Some of the functionalities are:

• Easy idiomatic access to the map date, such as width, height and tiles at specific coordinate.
• Check if a tile is traversable or not according the MovingAI format rules.
• Get the list of neighbors coordinates of a specific tile.
• [TO DO] Convert bitmaps into .map files.
• And more things I still need to decide. :D
• Serialize/Deserialzie .map and .scen files into JSON/YAML using serde (activate --features serde)

How to use

extern crate movingai;

use std::path::Path;
use movingai::parser::parse_map_file;

fn main() {
    let map = parse_map_file(Path::new("./test/arena.map")).unwrap();
    let width = map.width();
    let tile = map[(4,5)]; // Access map location at row 4 and column 5.
}

With this library is to use for implementing pathfinding algorithms:

// A* shortest path algorithm.

fn shortest_path(map: &MovingAiMap, start: Coords2D, goal: Coords2D) -> Option<f64> {

    let mut heap = BinaryHeap::new();
    let mut visited = Vec::<Coords2D>::new();

    // We're at `start`, with a zero cost
    heap.push(SearchNode { f: 0.0, g:0.0, h: distance(start, goal), current: start });

    while let Some(SearchNode { f: _f, g, h: _h, current }) = heap.pop() {

        if current == goal { return Some(g); }

        if visited.contains(&current) {
            continue;
        }

        visited.push(current);

        for neigh in map.neighbors(current) {
            let new_h = distance(neigh, goal);
            let i = distance(neigh, current);
            let next = SearchNode { f: g+i+new_h, g: g+i, h: new_h, current: neigh };
            heap.push(next);
        }
    }

    // Goal not reachable
    None
}

and to write benchmark over a scen file!

fn main() {
    let map = parse_map_file(Path::new("./tests/arena.map")).unwrap();
    let scenes = parse_scen_file(Path::new("./tests/arena.map.scen")).unwrap();
    for scene in scenes {
        let start = scene.start_pos;
        let goal = scene.goal_pos;
        let t = Instant::now();
        match shortest_path(&map, (1,3), (4,3)) {
            Some(x) => {
                let duration = t.elapsed();
                let seconds = duration.as_secs();
                let ms = (duration.subsec_nanos() as f64) / 1_000_000.0;
                println!("{:?} -> {:?} \tin {:?} seconds and {:?} ms", start, goal, seconds, ms);
            }
            None => println!("None"),
        }
    }
}