Fix errors in guide

guide/master/src/learn-by-example/breather.md

@@ -50,7 +50,6 @@ fn collision(mut player: UniqueViewMut<Player>, v_friend: View<Friend>) {
 We can also handle the game over a little cleaner.
 
 ```rust,noplaypen
-
 enum GameOver {
     Defeat,
 }

guide/master/src/learn-by-example/friends.md

@@ -21,7 +21,10 @@ use shipyard::{Component, World};
 
 #[macroquad::main("Square Eater")]
 async fn main() {
+    rand::srand(macroquad::miniquad::date::now() as u64);
+
     // -- SNIP --
+
     let mut world = World::new();
 
     for _ in 0..5 {
@@ -48,8 +51,6 @@ fn render(player: &Player, world: &World) {
 
 impl Friend {
     fn new() -> Friend {
-        rand::srand(macroquad::miniquad::date::now() as u64);
-
         let width = screen_width();
         let height = screen_height();
 
@@ -115,7 +116,7 @@ fn render(world: &World) {
         friend.0.render(GREEN);
     }
 
-    let player = world.get_unique::<Player>().unwrap();
+    let player = world.get_unique::<&Player>().unwrap();
 
     player.square.render(BLUE);
 }
@@ -124,7 +125,7 @@ fn move_player(world: &World) {
     let width = screen_width();
     let height = screen_height();
     let (x, y) = mouse_position();
-    let mut player = world.get_unique_mut::<Player>().unwrap();
+    let mut player = world.get_unique::<&mut Player>().unwrap();
 
     player.square.x = x.clamp(0.0, width - player.square.size);
     player.square.y = y.clamp(0.0, height - player.square.size);

guide/master/src/learn-by-example/spark.md

@@ -5,6 +5,9 @@ Let's infuse a bit of life into our friends.
 ```rust,noplaypen
 use shipyard::{Component, IntoIter, Unique, UniqueView, UniqueViewMut, View, ViewMut, World};
 
+const GROWTH_RATE: f32 = 0.15;
+const MAX_SIZE: f32 = 25.0;
+
 async fn main() {
     // -- SNIP --
 
@@ -31,6 +34,8 @@ fn grow(mut vm_friend: ViewMut<Friend>) {
 It appears our `Friend`s want to come close to the `Player`, likely to give them a hug.
 
 ```rust,noplaypen
+const SPEED: f32 = 1.5;
+
 async fn main() {
     // -- SNIP --
 
@@ -104,7 +109,7 @@ async fn main() {
         world.run(move_player);
         world.run(move_friends);
         world.run(grow);
-        world.run(collide);
+        world.run(collision);
         world.run(render);
 
     // -- SNIP --

guide/master/src/learn-by-example/true-victory.md

@@ -47,6 +47,17 @@ Let's give the `Player` a little bit of help and a way to win again.
 In many games whenever the player is hit they'll turn invincible for a few frames.
 
 ```rust,noplaypen
+async fn main() {
+    // -- SNIP --
+
+    let player = Player {
+        // -- SNIP --
+        i_counter: 0,
+    };
+
+    // -- SNIP --
+}
+
 struct Player {
     // -- SNIP --
     i_counter: u32,
@@ -64,16 +75,17 @@ impl Player {
     }
 }
 
-
 fn collision(
     entities: EntitiesView,
     mut player: UniqueViewMut<Player>,
     v_friend: View<Friend>,
     v_power_pellets: View<PowerPellet>,
     mut vm_to_delete: ViewMut<ToDelete>,
 ) -> Result<(), GameOver> {
-            // -- SNIP --
+        // -- SNIP --
 
+            if player.powered_up() {
+                // -- SNIP --
             } else if player.is_invincible() {
                 continue;
             }
@@ -102,6 +114,10 @@ use shipyard::{
 async fn main() {
     // -- SNIP --
 
+    for _ in 0..5 {
+        let _entity_id = world.add_entity(Friend::new());
+    }
+
     world.add_workload(main_loop);
 
     loop {