From dd8551746ee0a1fd6e4a82d1b60fd2df70d8f7ab Mon Sep 17 00:00:00 2001
From: Alexander Baranov <baranovas@vtb.ru>
Date: Sun, 31 May 2026 15:05:28 +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          |  6 +--
 snake-game/src/gameplay.rs        | 63 +++++++++++++++++++++++++++++--
 snake-game/tests/rust_learning.rs | 24 ++++++++++++
 3 files changed, 87 insertions(+), 6 deletions(-)

diff --git a/snake-game/src/domain.rs b/snake-game/src/domain.rs
index f06be59..678291a 100644
--- a/snake-game/src/domain.rs
+++ b/snake-game/src/domain.rs
@@ -1,6 +1,6 @@
 use bevy::prelude::*;
 
-pub const FRAMES_PER_SECOND: u8 = 2;
+pub const FRAMES_PER_SECOND: u8 = 24;
 pub const GRID_SIZE: u8 = 48;
 pub const HEAD_SIZE: u8 = (GRID_SIZE as f32 * 1.1) as u8;
 pub const SNAKE_VELOCITY: u8 = (GRID_SIZE as f32 / 1.0) as u8;
@@ -40,9 +40,9 @@ impl Direction {
     pub fn vector(&self) -> Vec2 {
         match self {
             Direction::Up => vec2(0., 1.),
-            Direction::Right => vec2(-1., 0.),
+            Direction::Right => vec2(1., 0.),
             Direction::Down => vec2(0., -1.),
-            Direction::Left => vec2(1., 0.),
+            Direction::Left => vec2(-1., 0.),
         }
     }
 }
diff --git a/snake-game/src/gameplay.rs b/snake-game/src/gameplay.rs
index 14f2753..6a670df 100644
--- a/snake-game/src/gameplay.rs
+++ b/snake-game/src/gameplay.rs
@@ -38,11 +38,11 @@ pub fn moving(time: Res<Time>, query: Query<(&mut Transform, &mut Inert, &Direct
             if ovf_vec.x != 0. && ovf_vec.y != 0. {
                 transform.translation -= ovf_vec.extend(0.0);
                 let delta = ovf_vec.x + ovf_vec.y;
-                inert.0 = *direction;
-                let inert_vec = inert.0.vector();
+                let inert_vec = direction.vector();
                 let delta_vec = inert_vec * delta;
                 transform.translation += delta_vec.extend(0.0);
             }
+            inert.0 = *direction;
         }
     }
 }
@@ -58,9 +58,34 @@ fn get_overflow(grid: f32, coord: f32, delta: f32) -> f32 {
     }
 }
 
+/// 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
+    }
+}
+
 #[cfg(test)]
 mod test {
-    use crate::gameplay::get_overflow;
+    use crate::gameplay::*;
 
     #[test]
     fn test_get_overflow() {
@@ -69,4 +94,36 @@ mod test {
         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());
+    }
 }
diff --git a/snake-game/tests/rust_learning.rs b/snake-game/tests/rust_learning.rs
index a395fb9..a8252e7 100644
--- a/snake-game/tests/rust_learning.rs
+++ b/snake-game/tests/rust_learning.rs
@@ -12,3 +12,27 @@ fn test_remainder() {
     dbg!(6 % 5);
     dbg!(6.3 % 5.0);
 }
+
+#[test]
+fn test_ceil() {
+    dbg!(0.1_f32.ceil());
+    dbg!(-0.1_f32.ceil());
+    dbg!(5.9_f32.ceil());
+    dbg!(-5.9_f32.ceil());
+}
+
+#[test]
+fn test_floor() {
+    dbg!(0.1_f32.floor());
+    dbg!((-0.1_f32).floor());
+    dbg!((-0.2_f32).floor());
+    dbg!((-0.3_f32).floor());
+    dbg!((-1.0_f32 / 5.0_f32).floor());
+    dbg!(5.9_f32.floor());
+    dbg!(-5.9_f32.floor());
+}
+
+#[test]
+fn test_zero() {
+    dbg!(-0.0_f32 == 0.0_f32);
+}