From aea639a6b24beafc7920cb36fd50b2e823bafcbf Mon Sep 17 00:00:00 2001
From: Alexander Baranov <baranovas@vtb.ru>
Date: Mon, 1 Jun 2026 17:59:17 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9F=D1=80=D0=BE=D0=B5=D0=BA=D1=82=D0=BD?=
 =?UTF-8?q?=D0=B0=D1=8F=20=D1=80=D0=B0=D0=B1=D0=BE=D1=82=D0=B0=20-=20WIP?=
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---
 snake-game/src/domain.rs   |  4 ++
 snake-game/src/gameplay.rs | 76 --------------------------------------
 snake-game/src/lib.rs      |  2 +-
 snake-game/src/main.rs     |  4 +-
 snake-game/src/startup.rs  | 51 ++++++++++++++++++++-----
 5 files changed, 48 insertions(+), 89 deletions(-)

diff --git a/snake-game/src/domain.rs b/snake-game/src/domain.rs
index df5f17b..3572b2b 100644
--- a/snake-game/src/domain.rs
+++ b/snake-game/src/domain.rs
@@ -9,6 +9,10 @@ pub const SNAKE_VELOCITY: u8 = (GRID_SIZE as f32 / 1.0) as u8;
 #[derive(Component)]
 pub struct Head;
 
+/// Сегмент змеиного хвоста
+#[derive(Component)]
+pub struct Tail(pub u16);
+
 /// Направление движения
 #[derive(Component, PartialEq, Clone, Copy)]
 pub enum Direction {
diff --git a/snake-game/src/gameplay.rs b/snake-game/src/gameplay.rs
index d89d85a..acfe660 100644
--- a/snake-game/src/gameplay.rs
+++ b/snake-game/src/gameplay.rs
@@ -40,42 +40,6 @@ pub fn moving(time: Res<Time>, query: Query<(&mut Transform, &mut Inert, &Direct
     }
 }
 
-fn get_overflow(grid: f32, coord: f32, delta: f32) -> f32 {
-    let rem = coord % grid;
-    let rem = if rem < 0.0 { grid + rem } else { rem };
-    let new = rem + delta;
-    if new >= 0.0 && new <= grid {
-        0.0
-    } else {
-        new % grid
-    }
-}
-
-/// Найти значение значение на границе сетки, если она находится между значениями old и new
-fn find_grid_bound(old: f32, new: f32, grid: f32) -> f32 {
-    use std::f32::NAN;
-
-    if grid <= 0.0 {
-        return NAN;
-    };
-
-    let old_grid = old / grid;
-    let new_grid = new / grid;
-
-    let old_grid_left = old_grid.floor();
-    let old_grid_right = old_grid.ceil();
-    let new_grid_left = new_grid.floor();
-    let new_grid_right = new_grid.ceil();
-
-    if old_grid_right == new_grid_left {
-        old_grid_right * grid
-    } else if old_grid_left == new_grid_right {
-        old_grid_left * grid
-    } else {
-        NAN
-    }
-}
-
 /// Разбиение изменения координаты по границам сетки
 fn split_by_grid(src: f32, dst: f32, grid: f32) -> Vec<(f32, f32)> {
     if grid <= 0.0 {
@@ -114,46 +78,6 @@ fn split_by_grid(src: f32, dst: f32, grid: f32) -> Vec<(f32, f32)> {
 mod test {
     use crate::gameplay::*;
 
-    #[test]
-    fn test_get_overflow() {
-        assert_eq!(get_overflow(5.0, -6.0, 3.0), 2.0);
-        assert_eq!(get_overflow(5.0, 6.0, 3.0), 0.0);
-        assert_eq!(get_overflow(5.0, -6.0, -3.0), 0.0);
-        assert_eq!(get_overflow(5.0, 6.0, -3.0), -2.0);
-    }
-
-    #[test]
-    fn test_find_grid_bound() {
-        // проверка с положительными значениями old и new
-        assert!(find_grid_bound(1.0, 4.0, 5.0).is_nan());
-        assert!(find_grid_bound(4.0, 1.0, 5.0).is_nan());
-        assert_eq!(find_grid_bound(4.0, 6.0, 5.0), 5.0);
-        assert_eq!(find_grid_bound(6.0, 4.0, 5.0), 5.0);
-        assert!(find_grid_bound(1.0, 11.0, 5.0).is_nan());
-        assert!(find_grid_bound(11.0, 1.0, 5.0).is_nan());
-
-        // проверка с отрицательными значениями old и new
-        assert!(find_grid_bound(-1.0, -4.0, 5.0).is_nan());
-        assert!(find_grid_bound(-4.0, -1.0, 5.0).is_nan());
-        assert_eq!(find_grid_bound(-4.0, -6.0, 5.0), -5.0);
-        assert_eq!(find_grid_bound(-6.0, -4.0, 5.0), -5.0);
-        assert!(find_grid_bound(-1.0, -11.0, 5.0).is_nan());
-        assert!(find_grid_bound(-11.0, -1.0, 5.0).is_nan());
-
-        // проверка перехода через 0
-        assert_eq!(find_grid_bound(-1.0, 1.0, 5.0), 0.0);
-        assert_eq!(find_grid_bound(1.0, -1.0, 5.0), 0.0);
-        assert_eq!(find_grid_bound(-1.0, 1.0, 10.0), 0.0);
-        assert_eq!(find_grid_bound(1.0, -1.0, 10.0), 0.0);
-        assert!(find_grid_bound(-1.0, 10.0, 5.0).is_nan());
-        assert!(find_grid_bound(-10.0, 1.0, 5.0).is_nan());
-
-        // проверка при grid <= 0
-        assert!(find_grid_bound(1.0, 2.0, 0.0).is_nan());
-        assert!(find_grid_bound(1.0, 2.0, -0.0).is_nan());
-        assert!(find_grid_bound(1.0, 2.0, -0.1).is_nan());
-    }
-
     #[test]
     fn test_split_by_grid() {
         // движение вправо
diff --git a/snake-game/src/lib.rs b/snake-game/src/lib.rs
index b985ecb..39e28f4 100644
--- a/snake-game/src/lib.rs
+++ b/snake-game/src/lib.rs
@@ -42,4 +42,4 @@ mod gameplay;
 mod startup;
 
 pub use gameplay::{head_rotation, moving};
-pub use startup::startup;
+pub use startup::{setup_frame_rate, startup};
diff --git a/snake-game/src/main.rs b/snake-game/src/main.rs
index 006df56..4f3a876 100644
--- a/snake-game/src/main.rs
+++ b/snake-game/src/main.rs
@@ -1,5 +1,5 @@
 use bevy::prelude::*;
-use snake_game::{head_rotation, moving, startup};
+use snake_game::{head_rotation, moving, setup_frame_rate, startup};
 
 fn main() {
     App::new()
@@ -18,7 +18,7 @@ fn main() {
         )
         .insert_resource(bevy::winit::WinitSettings::desktop_app())
         .insert_resource(ClearColor(Color::srgb(0.3, 0.6, 0.8)))
-        .add_systems(Startup, startup)
+        .add_systems(Startup, (startup, setup_frame_rate))
         .add_systems(Update, (head_rotation, moving))
         .run();
 }
diff --git a/snake-game/src/startup.rs b/snake-game/src/startup.rs
index a755d16..ab937c9 100644
--- a/snake-game/src/startup.rs
+++ b/snake-game/src/startup.rs
@@ -1,17 +1,29 @@
 use std::time::Duration;
 
-use bevy::{ecs::spawn, prelude::*, winit::WinitSettings};
+use bevy::{prelude::*, winit::WinitSettings};
 
-use crate::domain::{Direction, FRAMES_PER_SECOND, GRID_SIZE, Inert, SNAKE_VELOCITY, Velocity};
+use crate::domain::Tail;
 
-/// Инициализация игрового мира
-pub fn startup(mut commands: Commands, mut winit: ResMut<WinitSettings>) {
-    use crate::domain::{HEAD_SIZE, Head};
+/// Настройка частоты кадров
+pub fn setup_frame_rate(mut winit: ResMut<WinitSettings>) {
+    use crate::domain::FRAMES_PER_SECOND;
 
     winit.focused_mode =
         bevy::winit::UpdateMode::reactive(Duration::from_secs_f32(1. / FRAMES_PER_SECOND as f32));
     winit.unfocused_mode =
         bevy::winit::UpdateMode::reactive(Duration::from_secs_f32(1. / FRAMES_PER_SECOND as f32));
+}
+
+/// Инициализация игрового мира
+pub fn startup(mut commands: Commands) {
+    spawn_snake(&mut commands);
+    spawn_grid(&mut commands);
+    commands.spawn(Camera2d);
+}
+
+/// Создать голову змеи
+fn spawn_snake(commands: &mut Commands) {
+    use crate::domain::{Direction, HEAD_SIZE, Head, Inert, SNAKE_VELOCITY, Velocity};
 
     let head = commands
         .spawn((
@@ -24,7 +36,7 @@ pub fn startup(mut commands: Commands, mut winit: ResMut<WinitSettings>) {
                 vec2(HEAD_SIZE as f32, HEAD_SIZE as f32),
             ),
             Transform {
-                translation: vec3(0., 0., 0.),
+                translation: vec3(0.0, 0.0, 1.0),
                 ..Default::default()
             },
         ))
@@ -35,7 +47,7 @@ pub fn startup(mut commands: Commands, mut winit: ResMut<WinitSettings>) {
             vec2(HEAD_SIZE as f32 * 0.3, HEAD_SIZE as f32 * 0.3),
         ),
         Transform {
-            translation: vec3(HEAD_SIZE as f32 * -0.25, HEAD_SIZE as f32 * 0.25, 0.),
+            translation: vec3(HEAD_SIZE as f32 * -0.25, HEAD_SIZE as f32 * 0.25, 0.0),
             ..Default::default()
         },
         ChildOf(head),
@@ -46,12 +58,33 @@ pub fn startup(mut commands: Commands, mut winit: ResMut<WinitSettings>) {
             vec2(HEAD_SIZE as f32 * 0.2, HEAD_SIZE as f32 * 0.2),
         ),
         Transform {
-            translation: vec3(HEAD_SIZE as f32 * 0.25, HEAD_SIZE as f32 * 0.25, 0.),
+            translation: vec3(HEAD_SIZE as f32 * 0.25, HEAD_SIZE as f32 * 0.25, 0.0),
             ..Default::default()
         },
         ChildOf(head),
     ));
 
+    commands.spawn((
+        Tail(0),
+        Direction::default(),
+        Inert::default(),
+        Velocity(0.0),
+        Sprite::from_color(
+            Color::srgb(0.7, 0.7, 0.7),
+            vec2(HEAD_SIZE as f32 * 0.8, HEAD_SIZE as f32 * 0.8),
+        ),
+        Transform {
+            translation: vec3(0.0, 0.0, 0.0),
+            ..Default::default()
+        },
+        // ChildOf(head),
+    ));
+}
+
+/// Создать координатную сетку
+fn spawn_grid(commands: &mut Commands) {
+    use crate::domain::GRID_SIZE;
+
     for x in -20..=20 {
         commands.spawn((
             Sprite::from_color(Color::srgb(1.0, 1.0, 0.5), vec2(1.0, 2000.0)),
@@ -70,6 +103,4 @@ pub fn startup(mut commands: Commands, mut winit: ResMut<WinitSettings>) {
             },
         ));
     }
-
-    commands.spawn(Camera2d);
 }