Split crate into shared logic library and binary crate (#52)

src/utils/trail.rs

@@ -1,70 +0,0 @@
-use crate::GameState;
-use bevy::prelude::*;
-
-#[derive(Component)]
-pub struct Trail {
-    points: Vec<Vec3>,
-    col_start: LinearRgba,
-    col_end: LinearRgba,
-}
-
-impl Trail {
-    pub fn new(points: usize, col_start: LinearRgba, col_end: LinearRgba) -> Self {
-        Self {
-            points: Vec::with_capacity(points),
-            col_start,
-            col_end,
-        }
-    }
-
-    pub fn with_pos(self, pos: Vec3) -> Self {
-        let mut trail = self;
-        trail.add(pos);
-        trail
-    }
-
-    pub fn add(&mut self, pos: Vec3) {
-        if self.points.len() >= self.points.capacity() {
-            self.points.pop();
-        }
-        self.points.insert(0, pos);
-    }
-}
-
-pub fn plugin(app: &mut App) {
-    app.add_systems(
-        FixedUpdate,
-        update_trail.run_if(in_state(GameState::Playing)),
-    );
-}
-
-fn update_trail(
-    mut query: Query<(Entity, &mut Trail, &Gizmo, &GlobalTransform)>,
-    global_transform: Query<&GlobalTransform>,
-    mut gizmo_assets: ResMut<Assets<GizmoAsset>>,
-) -> Result {
-    for (e, mut trail, gizmo, pos) in query.iter_mut() {
-        trail.add(pos.translation());
-
-        let parent_transform = global_transform.get(e)?;
-
-        let Some(gizmo) = gizmo_assets.get_mut(gizmo.handle.id()) else {
-            continue;
-        };
-
-        gizmo.clear();
-
-        let lerp_denom = trail.points.len() as f32;
-
-        gizmo.linestrip_gradient(trail.points.iter().enumerate().map(|(i, pos)| {
-            (
-                GlobalTransform::from_translation(*pos)
-                    .reparented_to(parent_transform)
-                    .translation,
-                trail.col_start.mix(&trail.col_end, i as f32 / lerp_denom),
-            )
-        }));
-    }
-
-    Ok(())
-}