Complete Chapter 2

src/components.rs

@@ -21,6 +21,12 @@ pub struct Renderable {
     pub path: String,
 }
 
+impl Renderable {
+    pub fn new(path: &str) -> Self {
+        Renderable { path: path.to_string() }
+    }
+}
+
 #[derive(Component)]
 #[storage(VecStorage)]
 pub struct Wall {}

src/entities.rs

@@ -5,9 +5,7 @@ pub fn create_wall(world: &mut World, position: Position) {
     world
         .create_entity()
         .with(Position { z: 10, ..position })
-        .with(Renderable {
-            path: "/images/wall.png".to_string(),
-        })
+        .with(Renderable::new("/images/wall.png"))
         .with(Wall {})
         .with(Immovable)
         .build();
@@ -17,9 +15,7 @@ pub fn create_floor(world: &mut World, position: Position) {
     world
         .create_entity()
         .with(Position { z: 5, ..position })
-        .with(Renderable {
-            path: "/images/floor.png".to_string(),
-        })
+        .with(Renderable::new("/images/floor.png"))
         .build();
 }
 
@@ -27,9 +23,7 @@ pub fn create_box(world: &mut World, position: Position) {
     world
         .create_entity()
         .with(Position { z: 10, ..position })
-        .with(Renderable {
-            path: "/images/box.png".to_string(),
-        })
+        .with(Renderable::new("/images/box.png"))
         .with(Box {})
         .with(Movable)
         .build();
@@ -39,9 +33,7 @@ pub fn create_box_spot(world: &mut World, position: Position) {
     world
         .create_entity()
         .with(Position { z: 9, ..position })
-        .with(Renderable {
-            path: "/images/box_spot.png".to_string(),
-        })
+        .with(Renderable::new("/images/box_spot.png"))
         .with(BoxSpot {})
         .build();
 }
@@ -50,9 +42,7 @@ pub fn create_player(world: &mut World, position: Position) {
     world
         .create_entity()
         .with(Position { z: 10, ..position })
-        .with(Renderable {
-            path: "/images/player.png".to_string(),
-        })
+        .with(Renderable::new("/images/player.png"))
         .with(Player {})
         .with(Movable)
         .build();

src/resources.rs

@@ -1,12 +1,42 @@
 use ggez::event::KeyCode;
 use specs::World;
+use std::fmt;
+use std::fmt::Display;
 
-// Resources
 #[derive(Default)]
 pub struct InputQueue {
     pub keys_pressed: Vec<KeyCode>,
 }
 
-pub fn register_resources(world: &mut World) {
-    world.insert(InputQueue::default())
+#[derive(Default)]
+pub struct Gameplay {
+    pub state: GameplayState,
+    pub moves_count: usize,
+}
+
+pub enum GameplayState {
+    Playing,
+    Won,
+}
+
+impl Default for GameplayState {
+    fn default() -> Self {
+        Self::Playing
+    }
+}
+
+impl Display for GameplayState {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt.write_str(match self {
+            GameplayState::Playing => "Playing",
+            GameplayState::Won => "Won",
+        })?;
+
+        Ok(())
+    }
+}
+
+pub fn register_resources(world: &mut World) {
+    world.insert(InputQueue::default());
+    world.insert(Gameplay::default());
 }

src/systems/input_system.rs

@@ -5,9 +5,9 @@ use specs::{Entities, ReadStorage, System, Write, WriteStorage};
 
 use std::collections::HashMap;
 
-use crate::components::{Immovable, Movable, Player, Position};
-use crate::constants::{MAP_HEIGHT, MAP_WIDTH};
-use crate::resources::InputQueue;
+use crate::components::*;
+use crate::constants::*;
+use crate::resources::{Gameplay, InputQueue};
 
 pub struct InputSystem {}
 
@@ -15,6 +15,7 @@ impl<'a> System<'a> for InputSystem {
     // Data
     type SystemData = (
         Write<'a, InputQueue>,
+        Write<'a, Gameplay>,
         Entities<'a>,
         WriteStorage<'a, Position>,
         ReadStorage<'a, Player>,
@@ -23,7 +24,8 @@ impl<'a> System<'a> for InputSystem {
     );
 
     fn run(&mut self, data: Self::SystemData) {
-        let (mut input_queue, entities, mut positions, players, movables, immovables) = data;
+        let (mut input_queue, mut gameplay, entities, mut positions, players, movables, immovables) =
+            data;
 
         let mut to_move = Vec::new();
 
@@ -82,6 +84,11 @@ impl<'a> System<'a> for InputSystem {
             }
         }
 
+        // We've just moved, so let's increase the number of moves
+        if to_move.len() > 0 {
+            gameplay.moves_count += 1;
+        }
+
         // Now actually move what needs to be moved
         for (key, id) in to_move {
             let position = positions.get_mut(entities.entity(id));

src/systems/mod.rs

@@ -1,5 +1,7 @@
+mod gameplay_state_sytem;
 mod input_system;
 mod rendering_system;
 
+pub use self::gameplay_state_sytem::GameplayStateSystem;
 pub use self::input_system::InputSystem;
 pub use self::rendering_system::RenderingSystem;

src/systems/rendering_system.rs

@@ -1,21 +1,44 @@
-use ggez::graphics::DrawParam;
 use ggez::graphics::Image;
+use ggez::graphics::{Color, DrawParam};
 use ggez::nalgebra as na;
 use ggez::{graphics, Context};
-use specs::{Join, ReadStorage, System};
+use specs::{Join, Read, ReadStorage, System};
 
 use crate::components::{Position, Renderable};
 use crate::constants::TILE_WIDTH;
+use crate::resources::Gameplay;
 
 pub struct RenderingSystem<'a> {
     pub context: &'a mut Context,
 }
 
+impl RenderingSystem<'_> {
+    pub fn draw_text(&mut self, text_string: &str, x: f32, y: f32) {
+        let text = graphics::Text::new(text_string);
+        let destination = na::Point2::new(x, y);
+        let color = Some(Color::new(0.0, 0.0, 0.0, 1.0));
+        let dimensions = na::Point2::new(0.0, 20.0);
+
+        graphics::queue_text(self.context, &text, dimensions, color);
+        graphics::draw_queued_text(
+            self.context,
+            graphics::DrawParam::new().dest(destination),
+            None,
+            graphics::FilterMode::Linear,
+        )
+        .expect("expected drawing queued text");
+    }
+}
+
 impl<'a> System<'a> for RenderingSystem<'a> {
-    type SystemData = (ReadStorage<'a, Position>, ReadStorage<'a, Renderable>);
+    type SystemData = (
+        Read<'a, Gameplay>,
+        ReadStorage<'a, Position>,
+        ReadStorage<'a, Renderable>,
+    );
 
     fn run(&mut self, data: Self::SystemData) {
-        let (positions, renderables) = data;
+        let (gameplay, positions, renderables) = data;
 
         // Clear the screen/set the background
         graphics::clear(self.context, graphics::Color::new(0.95, 0.95, 0.95, 1.0));
@@ -38,6 +61,10 @@ impl<'a> System<'a> for RenderingSystem<'a> {
             graphics::draw(self.context, &image, draw_params).expect("expected render");
         }
 
+        // Render any text
+        self.draw_text(&gameplay.state.to_string(), 525.0, 80.0);
+        self.draw_text(&gameplay.moves_count.to_string(), 525.0, 100.0);
+
         // Finally, present the context, this will actually display everything
         // on the screen.
         graphics::present(self.context).expect("expected to present");