initial commit

src/ui/crosshair.rs

@@ -0,0 +1,48 @@
+
+use bevy::prelude::*;
+
+pub struct CrosshairPlugin;
+
+impl Plugin for CrosshairPlugin
+{
+    fn build(&self, app: &mut App)
+    {
+        app.add_systems(Startup, setup_crosshair);
+    }
+}
+
+fn setup_crosshair(
+    mut commands: Commands,
+) {
+    const CROSSHAIR_THICKNESS: f32 = 2.0;
+    const CROSSHAIR_LENGTH: f32 = 10.0;
+
+    commands
+        .spawn(Node {
+            width: Val::Percent(100.0),
+            height: Val::Percent(100.0),
+            position_type: PositionType::Absolute,
+            justify_content: JustifyContent::Center,
+            align_items: AlignItems::Center,
+            ..default()
+        })
+        .with_child((
+            Node {
+                width: Val::Px(CROSSHAIR_THICKNESS),
+                height: Val::Px(CROSSHAIR_LENGTH),
+                position_type: PositionType::Absolute,
+                ..default()
+            },
+            BackgroundColor(Color::WHITE),
+        ))
+        .with_child((
+            Node {
+                width: Val::Px(CROSSHAIR_LENGTH),
+                height: Val::Px(CROSSHAIR_THICKNESS),
+                position_type: PositionType::Absolute,
+                ..default()
+            },
+            BackgroundColor(Color::WHITE),
+        ))
+        ;
+}

src/ui/mod.rs

@@ -0,0 +1,14 @@
+
+use bevy::prelude::*;
+
+mod crosshair;
+
+pub struct UiPlugin;
+
+impl Plugin for UiPlugin
+{
+    fn build(&self, app: &mut App)
+    {
+        app.add_plugins(crosshair::CrosshairPlugin);
+    }
+}