laptopneedsnewversion

src/components.rs

@@ -22,5 +22,9 @@ pub struct Player {}
 #[derive(Component)]
 pub struct Viewshed {
     pub visible_tiles : Vec<rltk::Point>,
-    pub range : i32
+    pub range : i32,
+    pub dirty : bool
 }
+
+#[derive(Component, Debug)]
+pub struct Monster {}

src/main.rs

@@ -40,9 +40,11 @@ impl GameState for State {
 
         let positions = self.ecs.read_storage::<Position>();
         let renderables = self.ecs.read_storage::<Renderable>();
+        let map = self.ecs.fetch::<Map>();
 
         for (pos, render) in (&positions, &renderables).join() {
-            ctx.set(pos.x, pos.y, render.fg, render.bg, render.glyph);
+            let idx = map.xy_idx(pos.x, pos.y);
+            if map.visible_tiles[idx] {ctx.set(pos.x, pos.y, render.fg, render.bg, render.glyph) }
         }
     }
 }
@@ -57,10 +59,10 @@ fn main() -> rltk::BError {
     gs.ecs.register::<Renderable>();
     gs.ecs.register::<Player>();
     gs.ecs.register::<Viewshed>();
+    gs.ecs.register::<Monster>();
 
     let map = Map::new_map_rooms_and_corridors();
     let (player_x, player_y) = map.rooms[0].center();
-    gs.ecs.insert(map);
     
 
     gs.ecs
@@ -75,9 +77,33 @@ fn main() -> rltk::BError {
             bg: RGB::named(rltk::BLACK),
         })
         .with(Player {})
-        .with(Viewshed{ visible_tiles : Vec::new(), range : 8})
+        .with(Viewshed{ visible_tiles : Vec::new(), range : 8, dirty : true})
         .build();
 
+    let mut rng = rltk::RandomNumberGenerator::new();
+    for room in map.rooms.iter().skip(1) {
+        let (x,y) = room.center();
+
+        let glyph : rltk::FontCharType;
+        let roll = rng.roll_dice(1, 2);
+        match roll {
+            1 => { glyph = rltk::to_cp437('g') },
+            _ => { glyph = rltk::to_cp437('o') }
+        }
+
+        gs.ecs.create_entity()
+            .with(Position{ x, y })
+            .with(Renderable{
+                glyph: glyph,
+                fg: RGB::named(rltk::RED),
+                bg: RGB::named(rltk::BLACK),
+            })
+            .with(Viewshed{ visible_tiles : Vec::new(), range: 8, dirty: true})
+            .build();
+
+    }
+    gs.ecs.insert(map);
+
     // Main loop runner
     rltk::main_loop(context, gs)
 }

src/map.rs

@@ -9,12 +9,14 @@ pub enum TileType {
     Floor,
 }
 
+#[derive(Default)]
 pub struct Map {
     pub tiles : Vec::<TileType>,
     pub rooms : Vec::<Rect>,
     pub width : i32,
     pub height : i32,
-    pub revealed_tiles : Vec<bool>
+    pub revealed_tiles : Vec<bool>,
+    pub visible_tiles : Vec<bool>
 }
 
 impl Map {
@@ -55,7 +57,8 @@ impl Map {
             rooms : Vec::new(),
             width : 80,
             height : 50,
-            revealed_tiles : vec![false; 80*50]
+            revealed_tiles : vec![false; 80*50],
+            visible_tiles : vec![false; 80*50]
         };
     
         const MAX_ROOMS: i32 = 30;
@@ -148,29 +151,20 @@ pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
     let mut x = 0;
     for (idx, tile) in map.tiles.iter().enumerate() {
         if map.revealed_tiles[idx] {
+            let glyph;
+            let mut fg;
             match tile {
                 TileType::Floor => {
-                    ctx.set(
-                        x,
-                        y,
-                        RGB::from_f32(0.5, 0.5, 0.5),
-                        RGB::from_f32(0., 0., 0.),
-                        rltk::to_cp437('.'),
-                    );
+                    glyph = rltk::to_cp437('.');
+                    fg = RGB::from_f32(0.0, 0.5, 0.5);
                 }
                 TileType::Wall => {
-                    ctx.set(
-                        x,
-                        y,
-                        RGB::from_f32(0.0, 1.0, 0.0),
-                        RGB::from_f32(0., 0., 0.),
-                        rltk::to_cp437('#'),
-                    );
+                    glyph = rltk::to_cp437('#');
+                    fg = RGB::from_f32(0., 1.0, 0.);
                 }
             }
-    
-            
-            
+            if !map.visible_tiles[idx] { fg = fg.to_greyscale() }
+            ctx.set(x, y, fg, RGB::from_f32(0., 0., 0.), glyph);
         }
         x += 1;
             if x > 79 {

src/player.rs

@@ -1,18 +1,21 @@
 use rltk::{VirtualKeyCode, Rltk};
 use specs::prelude::*;
-use super::{Position, Player, TileType, Map, State};
+use super::{Position, Player, TileType, Map, State, Viewshed};
 use std::cmp::{min, max};
 
 pub fn try_move_player(delta_x: i32, delta_y: i32, ecs: &mut World) {
     let mut positions = ecs.write_storage::<Position>();
     let mut players = ecs.write_storage::<Player>();
+    let mut viewsheds = ecs.write_storage::<Viewshed>();
     let map = ecs.fetch::<Map>();
 
-    for (_player, pos) in (&mut players, &mut positions).join() {
+    for (_player, pos, viewshed) in (&mut players, &mut positions, &mut viewsheds).join() {
         let destination_idx = map.xy_idx(pos.x + delta_x, pos.y + delta_y);
         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));
+
+            viewshed.dirty = true
         }
     }
 }

src/visibility_system.rs

@@ -16,17 +16,23 @@ impl<'a> System<'a> for VisibilitySystem {
         let (mut map, entities, mut viewshed, pos, player) = data;
 
         for (ent, viewshed, pos) in (&entities, &mut viewshed, &pos).join() {
+            if viewshed.dirty {
+                viewshed.dirty = false;
                 viewshed.visible_tiles.clear();
                 viewshed.visible_tiles = field_of_view(Point::new(pos.x, pos.y), viewshed.range, &*map);
                 viewshed.visible_tiles.retain(|p| p.x >= 0 && p.x < map.width && p.y >= 0 && p.y < map.height);
     
                 let _p : Option<&Player> = player.get(ent);
                 if let Some(_p) = _p {
+                    for t in map.visible_tiles.iter_mut() { *t = false}
                     for vis in viewshed.visible_tiles.iter() {
                         let idx = map.xy_idx(vis.x, vis.y);
                         map.revealed_tiles[idx] = true;
+                        map.visible_tiles[idx] = true;
                     }
                 }
             }
+            
+        }
     }
 }