From 01251d735abda4fd8f0a4377c7c180463ba6533f Mon Sep 17 00:00:00 2001
From: Daniel Flanagan <daniel@lyte.dev>
Date: Wed, 24 Jul 2024 17:03:22 -0500
Subject: [PATCH] Someday

---
 src/camera.rs | 68 ++++++++++++++++++++++++++++++++++++++++++++++++---
 src/main.rs   |  2 +-
 src/player.rs |  2 +-
 3 files changed, 66 insertions(+), 6 deletions(-)

diff --git a/src/camera.rs b/src/camera.rs
index 965a7bf..cec1154 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -1,15 +1,21 @@
-use bevy::prelude::*;
+use bevy::{
+    prelude::*,
+    sprite::{MaterialMesh2dBundle, Mesh2dHandle},
+    window::PrimaryWindow,
+};
 
 use crate::player::Player;
 use bevy::render::camera::Camera as BevyCamera;
 
-pub struct Camera;
+pub struct CameraPlugin;
 
-impl Plugin for Camera {
+impl Plugin for CameraPlugin {
     fn build(&self, app: &mut App) {
         app.add_systems(Startup, spawn)
             .add_systems(PostUpdate, focus)
-            .add_systems(Update, y_sort);
+            .add_systems(Update, y_sort)
+            .add_systems(Startup, spawn_crosshair)
+            .add_systems(Update, rotate_crosshair);
     }
 }
 
@@ -19,6 +25,42 @@ fn spawn(mut commands: Commands) {
     commands.spawn(bundle);
 }
 
+#[derive(Component, Debug)]
+pub struct Crosshair;
+
+fn spawn_crosshair(
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<ColorMaterial>>,
+) {
+    let mesh = Mesh2dHandle(meshes.add(Capsule2d::new(3.0, 25.0)));
+    let material = materials.add(Color::hsl(360. * 1 as f32 / 3 as f32, 0.95, 0.7));
+    // let global_transform = GlobalTransform::from_xyz(
+    //     0.0, 20.0,
+    //     // TODO: need some way to ensure this draws above everything else?
+    //     // a UI layer or something?
+    //     1000.,
+    // );
+
+    let transform = Transform::from_xyz(
+        0.0, 0.0,
+        // TODO: need some way to ensure this draws above everything else?
+        // a UI layer or something?
+        1000.,
+    );
+
+    commands.spawn((
+        Crosshair,
+        MaterialMesh2dBundle {
+            // global_transform,
+            mesh,
+            material,
+            transform,
+            ..default()
+        },
+    ));
+}
+
 fn focus(
     player: Query<&Transform, With<Player>>,
     mut camera: Query<&mut Transform, (With<BevyCamera>, Without<Player>)>,
@@ -32,3 +74,21 @@ fn y_sort(mut q: Query<&mut Transform>) {
     q.iter_mut()
         .for_each(|mut tf| tf.translation.z = -tf.translation.y)
 }
+
+fn rotate_crosshair(
+    mut q: Query<&mut Transform, With<Crosshair>>,
+    win: Query<&Window, With<PrimaryWindow>>,
+    q_cam: Query<(&Camera, &GlobalTransform), With<Camera>>,
+) {
+    let (camera, camera_transform) = q_cam.single();
+    if let Some(world_position) = win
+        .single()
+        .cursor_position()
+        .and_then(|cursor| camera.viewport_to_world(&GlobalTransform::from_xyz(0., 0., 0.), cursor))
+        .map(|ray| ray.origin.truncate())
+    {
+        let mut t = q.single_mut();
+        t.look_at(Vec3::ZERO, world_position.extend(0.));
+        t.translation = camera_transform.translation();
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 0559e75..49cf346 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -30,7 +30,7 @@ fn main() {
     )
     .add_plugins((
         statue::Statue,
-        camera::Camera,
+        camera::CameraPlugin,
         assets::AssetPlugin,
         player::Player,
         main_menu::MainMenu,
diff --git a/src/player.rs b/src/player.rs
index 495e650..418c139 100644
--- a/src/player.rs
+++ b/src/player.rs
@@ -29,7 +29,7 @@ fn spawn_player(mut commands: Commands, assets: Res<AssetLoader>, asset_server:
                 texture,
                 atlas: assets.images.player.clone().into(),
                 sprite: Sprite::default(),
-                ..Default::default()
+                ..default()
             },
             Mover {
                 velocity: Velocity(Vec2::ZERO),