add off_map

src/main.rs

@@ -9,6 +9,7 @@ mod input;
 mod camera;
 mod map;
 mod player;
+mod off_map;
 
 #[derive(PhysicsLayer)]
 pub enum Layer {
@@ -33,6 +34,7 @@ fn main() {
         .add_system(map::collide)
         .add_system(player::spawn_player)
         .add_system(player::input.after("input"))
+        .add_system(off_map::check)
         .add_system(exit_on_escape)
         // .add_system(log_collisions)
         .run();

src/off_map.rs

@@ -0,0 +1,17 @@
+use bevy::prelude::*;
+
+#[derive(Component)]
+pub struct CanFallOffMap;
+
+const MIN_Y: f32 = -20.0;
+
+pub fn check(
+    mut commands: Commands,
+    entities: Query<(Entity, &Transform), With<CanFallOffMap>>,
+) {
+    for (entity, transform) in entities.iter() {
+        if transform.translation.y < MIN_Y {
+            commands.entity(entity).despawn_recursive();
+        }
+    }
+}

src/player.rs

@@ -5,6 +5,7 @@ use rand::prelude::*;
 use crate::{
     input::{InputState, Key, Source as InputSource},
     map::GroundContact,
+    off_map::CanFallOffMap,
     Layer,
 };
 
@@ -63,6 +64,7 @@ pub fn spawn_player(
             input_source: input_source.clone(),
             rotation: 0.0,
         })
+        .insert(CanFallOffMap)
         .insert(GroundContact::default())
         .insert(GlobalTransform::default())
         .insert(transform)