feat: 基于 World 和 Schedule 的原始框架构建

Cargo.toml

@@ -16,6 +16,10 @@ path = "src/bin/resource.rs"
 name = "move1"
 path = "src/bin/physics_in_fixed_timestep.rs"
 
+[[bin]]
+name = "world"
+path = "src/bin/world.rs"
+
 [workspace]
 resolver = "2" # Important! wgpu/Bevy needs this!
 

src/bin/world.rs

@@ -0,0 +1,77 @@
+use bevy::prelude::*;
+use std::time::Duration;
+
+#[derive(Component)]
+struct Person;
+
+#[derive(Component)]
+struct Name(String);
+
+// add people to our World using a "startup system".
+// startup systems are just like normal systems, but they run exactly once, before all other systems, right when our app starts.
+// use Commands to spawn some entities into our World:
+fn add_people(mut commands: Commands) {
+    println!("adding people");
+    commands.spawn((Person, Name("Elaina Proctor".to_string())));
+    commands.spawn((Person, Name("Renzo Hume".to_string())));
+    commands.spawn((Person, Name("Zayna Nieves".to_string())));
+}
+
+// make query mutable, and use a mutable reference (&mut) to the components we want to change
+fn update_people(mut query: Query<&mut Name, With<Person>>) {
+    println!("update people");
+    for mut name in &mut query {
+        if name.0 == "Elaina Proctor" {
+            name.0 = "New Name Elaina Hume".to_string();
+            break; // We don't need to change any other names.
+        }
+    }
+}
+
+#[derive(Resource)]
+struct GreetTimer(Timer);
+
+// customize some Resource
+#[derive(Resource)]
+struct CalledTimes(i32);
+
+fn greet_people(
+    mut time: ResMut<Time>,
+    mut timer: ResMut<GreetTimer>,
+    mut demo: ResMut<CalledTimes>,
+    query: Query<&Name, With<Person>>,
+) {
+    // Update the timer with the elapsed time since the last frame
+    time.advance_to(Duration::from_secs(3));
+    loop {
+        println!("{:?}", time.delta());
+        if timer.0.tick(time.delta()).just_finished() {
+            demo.0 += 1;
+            for name in query.iter() {
+                println!("hello {}! called {} times", name.0, demo.0);
+            }
+        }
+    }
+}
+
+#[derive(SystemSet, Debug, Clone, PartialEq, Eq, Hash)]
+enum SimulationSet {
+    Spawn,
+    Age,
+}
+
+fn main() {
+    let mut world = World::new();
+    world.insert_resource(CalledTimes { 0: 0 });
+    world.insert_resource(GreetTimer(Timer::from_seconds(2.0, TimerMode::Repeating)));
+    world.init_resource::<Time>();
+
+    let mut schedule = Schedule::default();
+    schedule.add_systems((
+        add_people.in_set(SimulationSet::Spawn),
+        (update_people, greet_people)
+            .chain()
+            .after(SimulationSet::Spawn),
+    ));
+    schedule.run(&mut world);
+}