turn based actions and monsters react on sight only

src/components.rs

@@ -27,3 +27,9 @@ pub struct Viewshed {
 
 #[derive(Component, Debug)]
 pub struct Monster {}
+
+
+#[derive(Component, Debug)]
+pub struct Name {
+    pub name : String
+}

src/main.rs

@@ -1,4 +1,4 @@
-use rltk::{Console, GameState, Rltk, VirtualKeyCode, RGB};
+use rltk::{Console, GameState, Point, Rltk, VirtualKeyCode, RGB};
 use specs::prelude::*;
 use std::cmp::{max, min};
 mod rect;
@@ -15,8 +15,15 @@ pub use monster_ai_system::MonsterAI;
 #[macro_use]
 extern crate specs_derive;
 
+#[derive(PartialEq, Copy, Clone)]
+pub enum RunState {
+    Paused,
+    Running,
+}
+
 pub struct State {
     ecs: World,
+    runstate: RunState,
 }
 
 pub fn try_move_player(delta_x: i32, delta_y: i32, ecs: &mut World) {
@@ -30,16 +37,18 @@ pub fn try_move_player(delta_x: i32, delta_y: i32, ecs: &mut World) {
         if map.tiles[destination_idx] != TileType::Wall {
             pos.x = min(79, max(0, pos.x + delta_x));
             pos.y = min(49, max(0, pos.y + delta_y));
-
+            let mut ppos = ecs.write_resource::<Point>();
+            ppos.x = pos.x;
+            ppos.y = pos.y;
             viewshed.dirty = true;
         }
     }
 }
 
-pub fn player_input(gs: &mut State, ctx: &mut Rltk) {
+pub fn player_input(gs: &mut State, ctx: &mut Rltk) -> RunState {
     // Player movement
     match ctx.key {
-        None => {} // Nothing happened
+        None => return RunState::Paused, // Nothing happened
         Some(key) => match key {
             VirtualKeyCode::Left => try_move_player(-1, 0, &mut gs.ecs),
             VirtualKeyCode::Numpad4 => try_move_player(-1, 0, &mut gs.ecs),
@@ -53,9 +62,10 @@ pub fn player_input(gs: &mut State, ctx: &mut Rltk) {
             VirtualKeyCode::Down => try_move_player(0, 1, &mut gs.ecs),
             VirtualKeyCode::Numpad2 => try_move_player(0, 1, &mut gs.ecs),
             VirtualKeyCode::J => try_move_player(0, 1, &mut gs.ecs),
-            _ => {}
+            _ => return RunState::Paused,
         },
     }
+    RunState::Running
 }
 
 impl State {
@@ -71,8 +81,12 @@ impl State {
 impl GameState for State {
     fn tick(&mut self, ctx: &mut Rltk) {
         ctx.cls();
-        self.run_systems();
-        player_input(self, ctx);
+        if self.runstate == RunState::Running {
+            self.run_systems();
+            self.runstate = RunState::Paused;
+        } else {
+            self.runstate = player_input(self, ctx);
+        }
         draw_map(&self.ecs, ctx);
         let positions = self.ecs.read_storage::<Position>();
         let renderables = self.ecs.read_storage::<Renderable>();
@@ -126,7 +140,10 @@ fn main() {
     let context = RltkBuilder::simple80x50()
         .with_title("Roguelike Tutorial")
         .build();
-    let mut gs = State { ecs: World::new() };
+    let mut gs = State {
+        ecs: World::new(),
+        runstate: RunState::Running,
+    };
     let map = Map::new_map_rooms_and_corridors();
     let (player_x, player_y) = map.rooms[0].center();
 
@@ -135,6 +152,7 @@ fn main() {
     gs.ecs.register::<Player>();
     gs.ecs.register::<Viewshed>();
     gs.ecs.register::<Monster>();
+    gs.ecs.register::<Name>();
 
     gs.ecs
         .create_entity()
@@ -157,17 +175,17 @@ fn main() {
 
     let mut rng = rltk::RandomNumberGenerator::new();
 
-    for room in map.rooms.iter().skip(1) {
+    for (idx, room) in map.rooms.iter().skip(1).enumerate() {
         let (x, y) = room.center();
-        let glyph = match rng.roll_dice(1, 2) {
-            1 => rltk::to_cp437('g'),
-            _ => rltk::to_cp437('o'),
+        let (glyph, name): (u8, String) = match rng.roll_dice(1, 2) {
+            1 => (rltk::to_cp437('g'), "Goblin".to_string()),
+            _ => (rltk::to_cp437('o'), "Orc".to_string()),
         };
         gs.ecs
             .create_entity()
             .with(Position { x, y })
             .with(Renderable {
-                glyph: glyph,
+                glyph,
                 fg: RGB::named(rltk::RED),
                 bg: RGB::named(rltk::BLACK),
             })
@@ -177,10 +195,12 @@ fn main() {
                 dirty: true,
             })
             .with(Monster {})
+            .with(Name { name: format!("{} #{}", &name, idx) })
             .build();
     }
 
     gs.ecs.insert(map);
+    gs.ecs.insert(Point::new(player_x, player_y));
 
     rltk::main_loop(context, gs);
 }

src/monster_ai_system.rs

@@ -1,21 +1,24 @@
-use super::{Map, Monster, Position, Viewshed};
-use rltk::{console, field_of_view, Point};
+use super::{Monster, Name, Viewshed};
+use rltk::{console, Point};
 use specs::prelude::*;
 
 pub struct MonsterAI {}
 
 impl<'a> System<'a> for MonsterAI {
     type SystemData = (
+        ReadExpect<'a, Point>,
         ReadStorage<'a, Viewshed>,
-        ReadStorage<'a, Position>,
         ReadStorage<'a, Monster>,
+        ReadStorage<'a, Name>,
     );
 
-    fn run(&mut self, data : Self::SystemData) {
-        let (viewshed, pos, monster) = data;
+    fn run(&mut self, data: Self::SystemData) {
+        let (player_pos, viewshed, monster, name) = data;
 
-        for (viewshed, pos, monster) in (&viewshed, &pos, &monster).join() {
-            console::log("Monster considers their own existence")
+        for (viewshed, _monster, name) in (&viewshed, &monster, &name).join() {
+            if viewshed.visible_tiles.contains(&*player_pos) {
+                console::log(format!("Monster {} shouts insults", name.name));
+            }
         }
     }
 }