From 9bc33ae74b4b63c6c29765457747b0e3086957c3 Mon Sep 17 00:00:00 2001
From: Christian Nieves <cnieves@google.com>
Date: Mon, 9 Dec 2024 21:34:34 -0600
Subject: [PATCH] background grid

---
 src/bin/snake.rs  |   3 +-
 src/bin/tetris.rs | 144 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 146 insertions(+), 1 deletion(-)
 create mode 100644 src/bin/tetris.rs

diff --git a/src/bin/snake.rs b/src/bin/snake.rs
index ea36aae..fc2d603 100644
--- a/src/bin/snake.rs
+++ b/src/bin/snake.rs
@@ -196,6 +196,7 @@ fn spawn_segment(commands: &mut Commands, pos: Position) -> Entity {
         })
         .insert(SnakeSegment)
         .insert(Name::new(String::from("SnakeSegment")))
+        .insert(Name::new(String::from("SnakeSegmentTest")))
         .insert(pos)
         .insert(Size::square(0.77))
         .id()
@@ -287,7 +288,7 @@ impl Plugin for SnakePlugin {
                 FixedUpdate,
                 (snake_movement, snake_eating, snake_growth, game_over)
                     .chain()
-                    .run_if(on_timer(Duration::from_millis(500))),
+                    .run_if(on_timer(Duration::from_millis(1500))),
             )
             .add_systems(PostUpdate, (scale_translation, position_translation));
 
diff --git a/src/bin/tetris.rs b/src/bin/tetris.rs
new file mode 100644
index 0000000..9d05383
--- /dev/null
+++ b/src/bin/tetris.rs
@@ -0,0 +1,144 @@
+use bevy::window::PrimaryWindow;
+use bevy::{prelude::*, window::WindowResolution};
+use std::fmt::{self, Display, Formatter};
+use std::ops::{Add, Sub};
+
+use glite::debug_plugin;
+
+const GRID_X: f32 = 0.0;
+const GRID_Y: f32 = 0.0;
+const GRID_WIDTH: u32 = 15;
+const GRID_HEIGHT: u32 = 10;
+
+const WINDOW_WIDTH: f32 = 800.0;
+const WINDOW_HEIGHT: f32 = WINDOW_WIDTH * (GRID_HEIGHT as f32 / GRID_WIDTH as f32);
+
+#[cfg_attr(feature = "debug", derive(bevy_inspector_egui::InspectorOptions))]
+#[derive(Component, Debug, Default, Copy, Clone, Eq, PartialEq)]
+struct Position {
+    pub x: u32,
+    pub y: u32,
+}
+
+impl Add for Position {
+    type Output = Self;
+    fn add(self, other: Self) -> Self {
+        Self {
+            x: self.x + other.x,
+            y: self.y + other.y,
+        }
+    }
+}
+
+impl Sub for Position {
+    type Output = Self;
+    fn sub(self, other: Self) -> Self {
+        Self {
+            x: self.x.saturating_sub(other.x),
+            y: self.y.saturating_sub(other.y),
+        }
+    }
+}
+
+impl Display for Position {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(f, "({}, {})", self.x, self.y)
+    }
+}
+
+#[derive(Component)]
+struct Size {
+    width: f32,
+    height: f32,
+}
+
+impl Size {
+    pub fn square(x: f32) -> Self {
+        Self {
+            width: x,
+            height: x,
+        }
+    }
+}
+
+fn spawn_tile(commands: &mut Commands, color: Color, size: f32, position: Position) {
+    commands
+        .spawn(Sprite {
+            color,
+            ..Default::default()
+        })
+        .insert(position)
+        .insert(Size::square(size));
+}
+
+fn scale_translation(
+    mut windows: Query<&mut Window, With<PrimaryWindow>>,
+    mut q: Query<(&Size, &mut Transform)>,
+) {
+    let window = windows.single_mut();
+    for (sprite_size, mut transform) in q.iter_mut() {
+        transform.scale = Vec3::new(
+            sprite_size.width / GRID_WIDTH as f32 * window.width(),
+            sprite_size.height / GRID_HEIGHT as f32 * window.height(),
+            1.0,
+        );
+    }
+}
+
+fn position_translation(
+    mut windows: Query<&mut Window, With<PrimaryWindow>>,
+    mut q: Query<(&Position, &mut Transform)>,
+) {
+    // We subtract half the window width because our coordinate system starts at the bottom left, and
+    // Translation starts from the center. We then add half the size of a single tile, because we want
+    // our sprites bottom left corner to be at the bottom left of a tile, not the center.
+    fn convert(pos: f32, bound_window: f32, bound_game: f32) -> f32 {
+        let tile_size = bound_window / bound_game;
+        pos / bound_game * bound_window - (bound_window / 2.) + (tile_size / 2.)
+    }
+
+    let window = windows.single_mut();
+    for (pos, mut transform) in q.iter_mut() {
+        transform.translation = Vec3::new(
+            convert(pos.x as f32, window.width(), GRID_WIDTH as f32) + GRID_X,
+            convert(pos.y as f32, window.height(), GRID_HEIGHT as f32) + GRID_Y,
+            0.0,
+        );
+    }
+}
+
+fn test_update() {}
+
+fn main() {
+    let mut app = App::new();
+    app.add_plugins(DefaultPlugins.set(WindowPlugin {
+        primary_window: Some(Window {
+            title: "Tetris".to_string(),
+            resolution: WindowResolution::new(WINDOW_WIDTH, WINDOW_HEIGHT),
+            ..default()
+        }),
+        ..default()
+    }));
+
+    app.add_systems(Startup, setup_scene)
+        .add_systems(Update, test_update)
+        .add_systems(PostUpdate, (scale_translation, position_translation));
+
+    app.add_plugins(debug_plugin::debug_plugin);
+
+    // Run the app
+    app.run();
+}
+
+fn setup_scene(mut commands: Commands) {
+    commands.spawn(Camera2d {});
+    for y in 0..GRID_HEIGHT {
+        for x in 0..GRID_WIDTH {
+            let color = match ((y * GRID_HEIGHT) + x + y) % 2 == 0 {
+                true => Color::srgb(0.5, 0.5, 0.5),
+                false => Color::srgb(0.55, 0.55, 0.55),
+            };
+            spawn_tile(&mut commands, color, 1.0, Position { x, y });
+        }
+    }
+}