From cacfa0098a98db057f48fa34fadb7e31fcd08c65 Mon Sep 17 00:00:00 2001
From: Elijah Voigt <elijah.caine.mv@gmail.com>
Date: Tue, 12 Aug 2025 20:45:30 -0700
Subject: [PATCH] Added trail to physics bird

---
 src/bin/flappy/main.rs | 32 ++++++++++++++++++++++++++++----
 src/lib.rs             |  1 +
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/src/bin/flappy/main.rs b/src/bin/flappy/main.rs
index 43fa7ad..0e92933 100644
--- a/src/bin/flappy/main.rs
+++ b/src/bin/flappy/main.rs
@@ -1,6 +1,7 @@
 // Bevy basically forces "complex types" with Querys
 #![allow(clippy::type_complexity)]
 
+use bevy::color::palettes::tailwind::FUCHSIA_950;
 use bevy::render::view::{ColorGrading, ColorGradingGlobal};
 use games::physics2d::*;
 use games::*;
@@ -83,7 +84,10 @@ fn main() {
                     sync_resource_to_ui::<Deaths>.run_if(resource_changed::<Deaths>),
                     sync_resource_to_ui::<RewindFrames>.run_if(resource_changed::<RewindFrames>),
                 ),
-                update_tooltip.run_if(in_state(DebuggingState::On)),
+                (
+                    update_tooltip,
+                    debug_trail,
+                ).run_if(in_state(DebuggingState::On)),
                 // TODO: Add run_if to this system
                 update_batch_position.run_if(any_component_changed::<Batch>),
                 move_batches.run_if(on_event::<CollisionStarted>),
@@ -135,10 +139,7 @@ struct Tape {
 
 fn init_bird(
     mut commands: Commands,
-    server: Res<AssetServer>,
     bird_assets: Res<BirdAssets>,
-    mut meshes: ResMut<Assets<Mesh>>,
-    mut materials: ResMut<Assets<ColorMaterial>>,
 ) {
     let name = Name::new("bird");
 
@@ -893,3 +894,26 @@ fn update_tooltip(
         })
     });
 }
+
+fn debug_trail(
+    mut physics_objects: Query<(Entity ,&Transform), With<Mass>>,
+    mut gizmos: Gizmos,
+    mut positions: Local<HashMap<Entity, VecDeque<Vec3>>>,
+) {
+    physics_objects.iter_mut().for_each(|(e, obj)| {
+        if let Some(mut list) = positions.get_mut(&e) {
+            list.push_front(obj.translation);
+            if list.len() > 60 {
+                list.pop_back();
+            }
+        } else {
+            positions.insert(e, vec![obj.translation].into());
+        }
+
+        positions.iter().for_each(|(_e, list)| {
+            list.iter().for_each(|v| {
+                gizmos.cross_2d(Vec2::new(v.x, v.y), 12., FUCHSIA);
+            });
+        });
+    })
+}
diff --git a/src/lib.rs b/src/lib.rs
index c26b2d2..82127f0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,6 +13,7 @@ mod version;
 // Rust stdlib
 pub use std::f32::consts::PI;
 pub use std::fmt::Display;
+pub use std::collections::VecDeque;
 
 // Community libraries
 pub use bevy::{