Add unified movement system

src/components.rs

@@ -14,3 +14,9 @@ pub struct Enemy;
 
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub struct MovingRandomly;
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct WantsToMove {
+    pub entity: Entity,
+    pub destination: Point,
+}

src/systems/mod.rs

@@ -2,6 +2,7 @@ mod collisions;
 mod end_turn;
 mod entity_render;
 mod map_render;
+mod movement;
 mod player_input;
 mod random_move;
 
@@ -18,6 +19,8 @@ pub fn build_input_scheduler() -> Schedule {
 
 pub fn build_player_scheduler() -> Schedule {
     Schedule::builder()
+        .add_system(movement::movement_system())
+        .flush()
         .add_system(collisions::collisions_system())
         .flush()
         .add_system(map_render::map_render_system())
@@ -30,7 +33,7 @@ pub fn build_monster_scheduler() -> Schedule {
     Schedule::builder()
         .add_system(random_move::random_move_system())
         .flush()
-        .add_system(collisions::collisions_system())
+        .add_system(movement::movement_system())
         .flush()
         .add_system(map_render::map_render_system())
         .add_system(entity_render::entity_render_system())

src/systems/player_input.rs

@@ -1,36 +1,35 @@
 use crate::prelude::*;
 
 #[system]
-#[write_component(Point)]
+#[read_component(Point)]
 #[read_component(Player)]
 pub fn player_input(
     ecs: &mut SubWorld,
-    #[resource] map: &Map,
+    commands: &mut CommandBuffer,
     #[resource] key: &Option<VirtualKeyCode>,
-    #[resource] camera: &mut Camera,
     #[resource] turn_state: &mut TurnState,
 ) {
-    if let Some(key) = key {
+    let mut players = <(Entity, &Point)>::query().filter(component::<Player>());
+    if let Some(key) = *key {
         let delta = match key {
             VirtualKeyCode::Left | VirtualKeyCode::A => Point::new(-1, 0),
             VirtualKeyCode::Right | VirtualKeyCode::D => Point::new(1, 0),
             VirtualKeyCode::Up | VirtualKeyCode::W => Point::new(0, -1),
             VirtualKeyCode::Down | VirtualKeyCode::S => Point::new(0, 1),
-            _ => Point::zero(),
+            _ => Point::new(0, 0),
         };
 
-        if delta.x != 0 || delta.y != 0 {
-            let mut players = <&mut Point>::query().filter(component::<Player>());
-
-            players.iter_mut(ecs).for_each(|pos| {
+        players.iter_mut(ecs).for_each(|(entity, pos)| {
             let destination = *pos + delta;
 
-                if map.can_enter_tile(destination) {
-                    *pos = destination;
-                    camera.on_player_move(destination);
+            commands.push((
+                (),
+                WantsToMove {
+                    entity: *entity,
+                    destination,
+                },
+            ));
+        });
         *turn_state = TurnState::PlayerTurn;
     }
-            });
-        }
-    }
 }