initial

.gitignore

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+/target
+
+.cargo

Cargo.toml

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+[package]
+name = "lily"
+version = "0.1.0"
+authors = ["marisa <mokou@fastmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bevy = "0.5.0"

src/main.rs

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+use bevy::prelude::*;
+
+const VERSION: &'static str = "0.0-a1";
+
+mod setup;
+
+fn main() {
+    App::build()
+        .insert_resource(WindowDescriptor {
+            width: 500.,
+            height: 300.,
+            title: format!("Lily {}", VERSION),
+            vsync: false,
+            ..Default::default()
+        })
+        .add_startup_system(setup::system.system())
+        .run();
+}

src/setup.rs

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+use bevy::prelude::*;
+
+pub fn system(mut commands: Commands, asset_server: Res<AssetServer>, mut materials: ResMut<Assets<ColorMaterial>) {
+  // ui camera
+  commands.spawn_bundle(UiCameraBundle::default());
+  // root node
+  commands
+    .spawn_bundle(NodeBundle {
+      style: Style {
+        size: Size::new(Val::Percent(100.0), Val::Percent(100)),
+        justify_content: JustifyContent::SpaceBetween,
+        ..Default::default()
+      },
+      material: materials.add(Color::NONE.into()),
+      ..Default::default()
+    })
+}