Finish 2.3, Pushing boxes

Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 name = "rust-sokoban"
 version = "0.1.0"
-authors = ["Timothy Warren <twarren@nabancard.com>"]
+authors = ["Timothy Warren <tim@timshomepage.net>"]
 edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 ggez = "0.5.1"
-specs = { version="0.15.0", features=["specs-derive"] }
+specs = { version="0.16.1", features=["specs-derive"] }

src/main.rs

@@ -5,14 +5,19 @@ use ggez::graphics::DrawParam;
 use ggez::graphics::Image;
 use ggez::nalgebra as na;
 use ggez::{conf, event, Context, GameResult};
+use specs::world::Index;
+use specs::Entities;
+use specs::NullStorage;
+use specs::WriteStorage;
 use specs::{
-    join::Join, Builder, Component, Read, ReadStorage, RunNow, System, VecStorage, World, WorldExt,
-    Write, WriteStorage,
+    join::Join, Builder, Component, ReadStorage, RunNow, System, VecStorage, World, WorldExt, Write,
 };
-
+use std::collections::HashMap;
 use std::path;
 
 const TILE_WIDTH: f32 = 32.0;
+const MAP_WIDTH: u8 = 8;
+const MAP_HEIGHT: u8 = 9;
 
 // Components
 #[derive(Debug, Component, Clone, Copy)]
@@ -51,6 +56,14 @@ pub struct Box {}
 #[storage(VecStorage)]
 pub struct BoxSpot {}
 
+#[derive(Component, Default)]
+#[storage(NullStorage)]
+pub struct Movable;
+
+#[derive(Component, Default)]
+#[storage(NullStorage)]
+pub struct Immovable;
+
 // Resources
 #[derive(Default)]
 pub struct InputQueue {
@@ -101,17 +114,77 @@ impl<'a> System<'a> for InputSystem {
     // Data
     type SystemData = (
         Write<'a, InputQueue>,
+        Entities<'a>,
         WriteStorage<'a, Position>,
         ReadStorage<'a, Player>,
+        ReadStorage<'a, Movable>,
+        ReadStorage<'a, Immovable>,
     );
 
     fn run(&mut self, data: Self::SystemData) {
-        let (mut input_queue, mut positions, players) = data;
+        let (mut input_queue, entities, mut positions, players, movables, immovables) = data;
 
-        for (position, _player) in (&mut positions, &players).join() {
+        let mut to_move = Vec::new();
+
+        for (position, _player) in (&positions, &players).join() {
             // Get the first key pressed
             if let Some(key) = input_queue.keys_pressed.pop() {
-                // Apply the key to the position
+                // get all the movables and immovables
+                let mov: HashMap<(u8, u8), Index> = (&entities, &movables, &positions)
+                    .join()
+                    .map(|t| ((t.2.x, t.2.y), t.0.id()))
+                    .collect();
+                let immov: HashMap<(u8, u8), Index> = (&entities, &immovables, &positions)
+                    .join()
+                    .map(|t| ((t.2.x, t.2.y), t.0.id()))
+                    .collect();
+
+                // Now iterate through current position to the end of the map
+                // on the correct axis and check what needs to move.
+                let (start, end, is_x) = match key {
+                    KeyCode::Up => (position.y, 0, false),
+                    KeyCode::Down => (position.y, MAP_HEIGHT, false),
+                    KeyCode::Left => (position.x, 0, true),
+                    KeyCode::Right => (position.x, MAP_WIDTH, true),
+                    _ => continue,
+                };
+
+                let range: Vec<_> = if start < end {
+                    (start..=end).collect()
+                } else {
+                    (end..=start).rev().collect()
+                };
+
+                for x_or_y in range {
+                    let pos = if is_x {
+                        (x_or_y, position.y)
+                    } else {
+                        (position.x, x_or_y)
+                    };
+
+                    // find a movable
+                    // if it exists, we try to move it and continue
+                    // if it doesn't exist, we continue and try to find an immovable instead
+                    match mov.get(&pos) {
+                        Some(id) => to_move.push((key, id.clone())),
+                        None => {
+                            // find an immovable
+                            // if it exists, we need to stop and not move anything
+                            // if it doesn't exist, we stop because we found a gap
+                            match immov.get(&pos) {
+                                Some(_) => to_move.clear(),
+                                None => break,
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        // Now actually move what needs to be moved
+        for (key, id) in to_move {
+            let position = positions.get_mut(entities.entity(id));
+            if let Some(position) = position {
                 match key {
                     KeyCode::Up => position.y -= 1,
                     KeyCode::Down => position.y += 1,
@@ -171,6 +244,8 @@ pub fn register_components(world: &mut World) {
     world.register::<Wall>();
     world.register::<Box>();
     world.register::<BoxSpot>();
+    world.register::<Movable>();
+    world.register::<Immovable>();
 }
 
 pub fn register_resources(world: &mut World) {
@@ -185,6 +260,7 @@ pub fn create_wall(world: &mut World, position: Position) {
             path: "/images/wall.png".to_string(),
         })
         .with(Wall {})
+        .with(Immovable)
         .build();
 }
 
@@ -205,6 +281,8 @@ pub fn create_box(world: &mut World, position: Position) {
         .with(Renderable {
             path: "/images/box.png".to_string(),
         })
+        .with(Box {})
+        .with(Movable)
         .build();
 }
 
@@ -227,6 +305,7 @@ pub fn create_player(world: &mut World, position: Position) {
             path: "/images/player.png".to_string(),
         })
         .with(Player {})
+        .with(Movable)
         .build();
 }