Проектная работа - WIP

2026-06-15 17:17:26 +03:00
parent eca6422f71
commit 6e91e293e7
9 changed files with 193 additions and 198 deletions
@@ -0,0 +1,74 @@
+use bevy::prelude::*;
+
+use crate::{domain::*, tools::split_by_grid};
+
+/// Общая механика движения
+fn moving(
+    velocity: &f32,
+    time: &Time<Fixed>,
+    direction: &mut Direction,
+    mut transform: &mut Transform,
+    entity: Entity,
+    commands: &mut Commands,
+    switch_direction: impl FnOnce(Position) -> Option<Direction>,
+) {
+    // первая часть движения - до границы сетки
+    let delta = velocity * time.delta_secs();
+    let src = direction.get_coord(&transform);
+    let sign = direction.get_change_sign();
+    let dst = src + sign * delta;
+    let mut splited = split_by_grid(src, dst, GRID_SIZE as f32).into_iter();
+    let first = splited.next().unwrap_or((0.0, 0.0));
+    direction.set_coord(&mut transform, first.0);
+
+    // вторая часть движения - после границы сетки
+    if let Some(second) = splited.next() {
+        let delta = second.1.abs();
+        let pos = Position::from(&*transform);
+        if let Some(dir) = switch_direction(pos) {
+            trace!("set new direction for {entity} in {pos} --> {dir}");
+            *direction = dir;
+        }
+        let src = direction.get_coord(&*transform);
+        let sign = direction.get_change_sign();
+        let dst = src + sign * delta;
+        direction.set_coord(&mut transform, dst);
+
+        // создать событие прохождения границы сетки
+        commands.entity(entity).trigger(|e| GridBarier::new(e, pos, (&*direction).clone()));
+    }
+}
+
+/// Система движения головы змеи
+pub fn head_moving(
+    query: Query<(&mut Transform, &mut Direction, &Velocity, &Head, Entity)>,
+    time: Res<Time<Fixed>>,
+    mut snake_path: ResMut<SnakePath>,
+    mut commands: Commands,
+) {
+    let _span = trace_span!("head_moving").entered();
+    for (mut transform, mut direction, Velocity(velocity), head, entity) in query.into_iter() {
+        let next_dir = head.0.clone();
+        let snake_path = &mut snake_path;
+        let switch_direction = move |pos: Position| {
+            snake_path.insert(pos.clone(), next_dir.clone());
+            Some(next_dir)
+        };
+        moving(velocity, &time, &mut direction, &mut transform, entity, &mut commands, switch_direction);
+    }
+}
+
+/// Система движения тела змеи
+pub fn snake_moving(
+    query: Query<(&mut Transform, &mut Direction, &Velocity, Entity), (With<Tail>, Without<Head>)>,
+    time: Res<Time<Fixed>>,
+    snake_path: Res<SnakePath>,
+    mut commands: Commands,
+) {
+    let _span = trace_span!("snake_moving").entered();
+    for (mut transform, mut direction, Velocity(velocity), entity) in query.into_iter() {
+        let snake_path = &snake_path;
+        let switch_direction = move |pos: Position| snake_path.get(&pos).cloned();
+        moving(velocity, &time, &mut direction, &mut transform, entity, &mut commands, switch_direction);
+    }
+}