From 90f1df9da446505e05b03113182de324e987e9de Mon Sep 17 00:00:00 2001
From: "Elijah C. Voigt" <elijah.caine.mv@gmail.com>
Date: Wed, 12 Jun 2024 23:05:55 -0700
Subject: [PATCH] Fly camera is improving... but not done

---
 src/camera.rs    | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/editor.rs    | 28 ++++++++++++++--
 src/game/dice.rs |  1 -
 src/main.rs      |  4 +++
 src/prelude.rs   |  1 +
 5 files changed, 115 insertions(+), 4 deletions(-)
 create mode 100644 src/camera.rs

diff --git a/src/camera.rs b/src/camera.rs
new file mode 100644
index 0000000..db441f1
--- /dev/null
+++ b/src/camera.rs
@@ -0,0 +1,85 @@
+use crate::prelude::*;
+
+/// Menu Plugin; empty struct for Plugin impl
+pub(crate) struct CameraPlugin;
+
+impl Plugin for CameraPlugin {
+    fn build(&self, app: &mut App) {
+		app.add_systems(Update, editor_fly_camera);
+	}
+}
+
+#[derive(Component)]
+pub(crate) struct FlyCamera;
+
+/// Fly camera system for moving around like a drone
+fn editor_fly_camera(
+	mut cameras: Query<(&Camera, &mut Transform), With<FlyCamera>>,
+	windows: Query<&Window>,
+	primary_window: Query<Entity, With<PrimaryWindow>>,
+	keys: Res<ButtonInput<KeyCode>>,
+	mut cursor_events: EventReader<CursorMoved>,
+	time: Res<Time>,
+) {
+	let any_keys_pressed = keys.any_pressed([ KeyCode::KeyW, KeyCode::KeyS, KeyCode::KeyA, KeyCode::KeyD, KeyCode::KeyQ, KeyCode::KeyE ]);
+	let cursor_movement = cursor_events.len() > 0;
+
+	(any_keys_pressed || cursor_movement).then(|| {
+		// Iterate over all cameras
+		cameras.iter_mut().for_each(|(c, mut t)| {
+			// Determine which window this camera is attached to
+			let target_window = match c.target {
+				RenderTarget::Window(wr) => match wr {
+					WindowRef::Entity(e) => Some(e),
+					WindowRef::Primary => Some(primary_window.get_single().unwrap()),
+				},
+				_ => None,
+			};
+			// If the target window is focused
+			windows.get(target_window.unwrap()).unwrap().focused.then(|| {
+				let move_speed = 4.0;
+				let mut delta = Vec3::ZERO;
+				if keys.pressed(KeyCode::KeyW) {
+					delta += t.forward() * move_speed * time.delta_seconds()
+				}
+				if keys.pressed(KeyCode::KeyS) {
+					delta += t.back() * move_speed * time.delta_seconds()
+				}
+				if keys.pressed(KeyCode::KeyA) {
+					delta += t.left() * move_speed * time.delta_seconds()
+				}
+				if keys.pressed(KeyCode::KeyD) {
+					delta += t.right() * move_speed * time.delta_seconds()
+				}
+				if keys.pressed(KeyCode::KeyE) {
+					delta += Vec3::Y * move_speed * time.delta_seconds()
+				}
+				if keys.pressed(KeyCode::KeyQ) {
+					delta += Vec3::NEG_Y * move_speed * time.delta_seconds()
+				}
+				t.translation += delta;
+			});
+
+			cursor_events.read().filter_map(|CursorMoved { delta, window, .. }| {
+				(*window == target_window.unwrap()).then_some(delta)
+			}).for_each(|delta| {
+				// If there was actual movement, unpack those values
+				if let Some(Vec2 { x, y }) = delta {
+					if x > y {
+						// Find the horizontal angle of movement
+						let width = 1280.0;
+						let ratio_width = x / width;
+						let angle_width = ratio_width * std::f32::consts::PI;
+						t.rotate_local_y(-angle_width);
+					} else {
+						// Find the vertical angle of movement
+						let height = 720.0;
+						let ratio_height = y / height;
+						let angle_height = ratio_height * std::f32::consts::PI;
+						t.rotate_local_x(-angle_height);
+					}
+				}
+			});
+		});
+	});
+}
\ No newline at end of file
diff --git a/src/editor.rs b/src/editor.rs
index c1270d2..069f5e2 100644
--- a/src/editor.rs
+++ b/src/editor.rs
@@ -11,6 +11,7 @@ impl Plugin for EditorPlugin {
 		app.add_systems(OnEnter(EditorState::Open), open_editor);
 		app.add_systems(OnExit(EditorState::Open), close_editor);
 		app.add_systems(Update, origin_directions.run_if(in_state(EditorState::Open)));
+		app.add_systems(Update, world_plane.run_if(in_state(EditorState::Open)));
 	}
 }
 
@@ -46,11 +47,13 @@ fn init_editor(
 			// Spawn editor camera
 			let _editor_camera = parent.spawn((
 				Editor,
+				FlyCamera,
 				Camera3dBundle {
 					camera: Camera {
 						target: RenderTarget::Window(WindowRef::Entity(editor_window)),
 						..default()
 					},
+					transform: Transform::from_xyz(1.0, 1.0, 1.0).looking_at(Vec3::ZERO, Vec3::Y),
 					..default()
 				},
 			)).id();
@@ -59,7 +62,6 @@ fn init_editor(
 
 fn open_editor(
 	mut ws: Query<&mut Window, With<Editor>>,
-	state: Res<State<EditorState>>,
 ) {
 	ws.iter_mut().for_each(|mut w| {
 		w.visible = true;
@@ -68,7 +70,6 @@ fn open_editor(
 
 fn close_editor(
 	mut ws: Query<&mut Window, With<Editor>>,
-	state: Res<State<EditorState>>,
 ) {
 	ws.iter_mut().for_each(|mut w| {
 		w.visible = false;
@@ -95,5 +96,26 @@ fn toggle_editor(
 fn origin_directions(
 	mut gizmos: Gizmos
 ) {
-	gizmos.arrow(Vec3::ZERO, Vec3::ONE, Color::GREEN);
+	gizmos.arrow(Vec3::ZERO, Vec3::X, Color::RED);
+	gizmos.arrow(Vec3::ZERO, Vec3::Y, Color::GREEN);
+	gizmos.arrow(Vec3::ZERO, Vec3::Z, Color::BLUE);
+}
+
+fn world_plane(
+	mut gizmos: Gizmos
+) {
+	(-10..10).into_iter().for_each(|x| {
+		(-10..10).into_iter().for_each(|z| {
+			{
+				let start = Vec3::new(x as f32, 0.0, -10.0);
+				let end = Vec3::new(x as f32, 0.0, 10.0);
+				gizmos.line(start, end, Color::GRAY);
+			}
+			{
+				let start = Vec3::new(-10.0, 0.0, z as f32);
+				let end = Vec3::new(10.0, 0.0, z as f32);
+				gizmos.line(start, end, Color::GRAY);
+			}
+		});
+	});
 }
\ No newline at end of file
diff --git a/src/game/dice.rs b/src/game/dice.rs
index 36054b7..47a531f 100644
--- a/src/game/dice.rs
+++ b/src/game/dice.rs
@@ -50,7 +50,6 @@ fn init_dice_cuboid(mut commands: Commands, mut meshes: ResMut<Assets<Mesh>>) {
             [1.0, e], [0.0, e], [0.0, f], [1.0, f],
         ],
     );
-    info!("Adding cuboid {:?}", cuboid);
     commands.insert_resource(DiceCuboid { mesh: meshes.add(cuboid) });
 }
 
diff --git a/src/main.rs b/src/main.rs
index 6a7018c..b4843a3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,6 +22,9 @@ pub(crate) mod game;
 /// Debugger/Editor for inspecting the game
 pub(crate) mod editor;
 
+/// Camera control, mostly used in debug editor
+pub(crate) mod camera;
+
 use crate::prelude::*;
 
 fn main() {
@@ -39,6 +42,7 @@ fn main() {
     app.add_plugins(ui::UiPlugin);
     app.add_plugins(game::GamePlugin);
     app.add_plugins(editor::EditorPlugin);
+    app.add_plugins(camera::CameraPlugin);
     app.add_systems(Update, 
         handle_window_close.run_if(on_event::<WindowCloseRequested>())
     );
diff --git a/src/prelude.rs b/src/prelude.rs
index ae55eab..c35f949 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -30,3 +30,4 @@ pub(crate) use crate::ui::style::UiStyle;
 pub(crate) use crate::ui::title::UiTitle;
 pub(crate) use crate::ui::EmitEvent;
 pub(crate) use crate::ui::SetState;
+pub(crate) use crate::camera::FlyCamera;