can move around

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "tilewalk"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bevy = "0.8.1"
+
+# apparently the dynamic linking doesn't work on Windows?
+# bevy = { version "0.8.1", features = ["dynamic"] }
+
+[profile.dev]
+opt-level = 1
+
+# enable optimizations for dependencies (bevy) but not for our own app code
+[profile.dev.package."*"]
+opt-level = 3

src/main.rs

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+use bevy::{
+    input::{keyboard::KeyCode, Input},
+    prelude::*,
+};
+
+#[derive(Component)]
+struct Player;
+
+const BACKGROUND_COLOR: Color = Color::rgb(1.0, 1.0, 1.0);
+
+fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+    commands.spawn_bundle(Camera2dBundle{
+        transform: Transform::from_xyz(0.0, 0.0, 0.0),
+        ..default()
+    });
+
+    commands.spawn()
+        .insert(Player)
+        .insert_bundle(SpriteBundle{
+            texture: asset_server.load("icon.png"),
+            transform: Transform::from_xyz(0.0, 0.0, 0.0),
+            ..default()
+        });
+}
+
+
+fn map_key(now: &Res<Input<KeyCode>>, key: KeyCode, handler: &mut bool) {
+    if now.just_pressed(key)  { *handler = true; }
+    if now.just_released(key) { *handler = false; }
+}
+
+fn keyboard_input(now: Res<Input<KeyCode>>, mut input_state: ResMut<PlayerInput>) {
+    map_key(&now, KeyCode::A, &mut input_state.left);
+    map_key(&now, KeyCode::W, &mut input_state.up);
+    map_key(&now, KeyCode::S, &mut input_state.down);
+    map_key(&now, KeyCode::D, &mut input_state.right);
+}
+
+fn player_movement(
+    mut query: Query<&mut Transform, With<Player>>,
+    input_state: Res<PlayerInput>
+) {
+    let mut player_t = query.single_mut();
+    if input_state.up    { player_t.translation.y += 1.0; }
+    if input_state.down  { player_t.translation.y -= 1.0; }
+    if input_state.left  { player_t.translation.x -= 1.0; }
+    if input_state.right { player_t.translation.x += 1.0; }
+}
+
+#[derive(Default, Debug)]
+struct PlayerInput {
+    up:    bool,
+    down:  bool,
+    left:  bool,
+    right: bool,
+}
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .insert_resource(ClearColor(BACKGROUND_COLOR))
+        .add_startup_system(setup)
+        .insert_resource(PlayerInput::default())
+        .add_system(keyboard_input)
+        .add_system(player_movement)
+        .add_system(bevy::window::close_on_esc)
+        .run();
+}