Recreate OSM viewer with Bevy

.cargo/config.toml

@@ -0,0 +1,3 @@
+[target.x86_64-unknown-linux-gnu]
+linker = "clang"
+rustflags = ["-C", "link-arg=-fuse-ld=/usr/bin/mold"]

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-
+resolver = "2"
 members = [
   "abstio",
   "abstutil",

apps/osm_viewer_bevy/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "osm_viewer_bevy"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bevy_pancam = "0.7.0"
+map_model = { path = "../../map_model" }
+abstutil = { path = "../../abstutil" }
+bevy-earcutr = "0.7.0"
+
+[dependencies.bevy]
+version = "0.9.1"
+default-features = true

apps/osm_viewer_bevy/src/main.rs

@@ -0,0 +1,57 @@
+use abstutil;
+use bevy::{prelude::*, sprite::MaterialMesh2dBundle};
+use bevy_earcutr::*;
+use bevy_pancam::{PanCam, PanCamPlugin};
+use map_model::Map;
+
+#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+enum AppState {
+    Loading,
+    Running,
+}
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugin(PanCamPlugin::default())
+        .add_startup_system(setup)
+        .run();
+}
+
+fn setup(
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<ColorMaterial>>,
+) {
+    let mut timer = abstutil::time::Timer::new("load_map");
+    let map_model = Map::load_synchronously(
+        "../../data/system/us/seattle/maps/montlake.bin".to_string(),
+        &mut timer,
+    );
+
+    for road in map_model.all_roads().iter() {
+        let poly = road.get_thick_polygon();
+
+        let mut builder = PolygonMeshBuilder::new();
+        // Call `add_earcutr_input` or each polygon you want in the mesh.
+        builder.add_earcutr_input(EarcutrInput {
+            vertices: poly
+                .get_outer_ring()
+                .points()
+                .iter()
+                .flat_map(|p| vec![p.x(), p.y()])
+                .collect::<Vec<f64>>(),
+            interior_indices: vec![],
+        });
+
+        if let Some(mesh) = builder.build() {
+            commands.spawn(MaterialMesh2dBundle {
+                mesh: meshes.add(Mesh::from(mesh)).into(),
+                material: materials.add(ColorMaterial::from(Color::PURPLE)),
+                ..default()
+            });
+        };
+    }
+
+    commands.spawn((Camera2dBundle::default(), PanCam::default()));
+}