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use bevy::app::AppExit;
use bevy::prelude::*;
use bevy::render::camera::Camera;
use std::fs::File;
use std::io::{BufRead, BufReader};
fn main() {
App::build()
.add_resource(WindowDescriptor {
title: "Advent of Code".to_string(),
width: 1920,
height: 1080,
..Default::default()
})
.add_resource(ClearColor(Color::rgb(0., 0., 0.)))
.add_startup_system(setup_camera.system())
.add_startup_stage("game_entities")
.add_startup_system_to_stage("game_entities", read_input_file.system())
.add_system(move_tobogganist.system())
.add_system(collide_with_trees.system())
.add_system(clear_finished_tobogganists.system())
.add_system(end_of_slope.system())
.add_system(translate_positions.system())
.add_system(tobogganist_cam.system())
.add_plugins(DefaultPlugins)
.run();
}
fn setup_camera(mut commands: Commands, mut materials: ResMut<Assets<ColorMaterial>>) {
commands.spawn(Camera2dComponents::default());
commands.insert_resource(Materials {
tobogganist_material: materials.add(Color::rgb(0., 0., 255.).into()),
tree_material: materials.add(Color::rgb(0., 255., 0.).into()),
});
}
struct Materials {
tobogganist_material: Handle<ColorMaterial>,
tree_material: Handle<ColorMaterial>,
}
struct Tobogganist;
struct Tree;
#[derive(PartialEq, Eq)]
struct Position {
x: usize,
y: usize,
}
struct Velocity {
x: usize,
y: usize,
}
struct MapSize {
width: usize,
height: usize,
}
struct TreeHitCount(usize);
struct Score(usize);
fn read_input_file(mut commands: Commands, materials: Res<Materials>) {
commands
.spawn(SpriteComponents {
sprite: Sprite::new(Vec2::new(10., 10.)),
material: materials.tobogganist_material.clone(),
..Default::default()
})
.with(Tobogganist)
.with(Position { x: 0, y: 0 })
.with(Velocity { x: 1, y: 1 })
.with(TreeHitCount(0));
commands
.spawn(SpriteComponents {
sprite: Sprite::new(Vec2::new(10., 10.)),
material: materials.tobogganist_material.clone(),
..Default::default()
})
.with(Tobogganist)
.with(Position { x: 0, y: 0 })
.with(Velocity { x: 3, y: 1 })
.with(TreeHitCount(0));
commands
.spawn(SpriteComponents {
sprite: Sprite::new(Vec2::new(10., 10.)),
material: materials.tobogganist_material.clone(),
..Default::default()
})
.with(Tobogganist)
.with(Position { x: 0, y: 0 })
.with(Velocity { x: 5, y: 1 })
.with(TreeHitCount(0));
commands
.spawn(SpriteComponents {
sprite: Sprite::new(Vec2::new(10., 10.)),
material: materials.tobogganist_material.clone(),
..Default::default()
})
.with(Tobogganist)
.with(Position { x: 0, y: 0 })
.with(Velocity { x: 7, y: 1 })
.with(TreeHitCount(0));
commands
.spawn(SpriteComponents {
sprite: Sprite::new(Vec2::new(10., 10.)),
material: materials.tobogganist_material.clone(),
..Default::default()
})
.with(Tobogganist)
.with(Position { x: 0, y: 0 })
.with(Velocity { x: 1, y: 2 })
.with(TreeHitCount(0));
let f = File::open("./inputs/day_3.txt").expect("Failed to read file"); // TODO: Use the asset loading system to load this rather?
let mut width = 0;
let mut height = 0;
for (y, line) in BufReader::new(f).lines().enumerate() {
let line = line.expect("Error reading file");
let line = line.trim();
width = width.max(line.len());
for (x, c) in line.chars().enumerate() {
if c == '#' {
commands
.spawn(SpriteComponents {
sprite: Sprite::new(Vec2::new(10., 10.)),
material: materials.tree_material.clone(),
..Default::default()
})
.with(Tree)
.with(Position { x, y })
.with(TreeHitCount(0));
}
}
height = y + 1;
}
commands.insert_resource(MapSize { width, height });
commands.insert_resource(Score(1));
}
fn translate_positions(mut transform: Mut<Transform>, position: &Position) {
transform.translation = Vec3::new(position.x as f32 * 10., position.y as f32 * -10., 0.);
}
fn tobogganist_cam(
tobogganist: Query<With<Tobogganist, &Transform>>,
mut camera: Query<With<Camera, &mut Transform>>,
) {
for mut camera_transform in camera.iter_mut() {
if let Some(tobogganist_transform) = tobogganist.iter().next() {
camera_transform.translation = Vec3::new(0., tobogganist_transform.translation.y(), 0.);
}
}
}
fn move_tobogganist(map_size: Res<MapSize>, mut position: Mut<Position>, velocity: &Velocity) {
position.x += velocity.x;
position.x %= map_size.width;
position.y += velocity.y;
}
fn collide_with_trees(
mut tobogganists: Query<With<Tobogganist, (&Position, &mut TreeHitCount)>>,
trees: Query<With<Tree, &Position>>,
) {
for (tobogganist_position, mut tree_hit_count) in tobogganists.iter_mut() {
for tree_position in trees.iter() {
if *tree_position == *tobogganist_position {
tree_hit_count.0 += 1;
}
}
}
}
fn clear_finished_tobogganists(
mut commands: Commands,
map_size: Res<MapSize>,
mut score: ResMut<Score>,
tobogganists: Query<With<Tobogganist, (Entity, &Position, &Velocity, &TreeHitCount)>>,
) {
for (entity, position, velocity, tree_hit_count) in tobogganists.iter() {
if position.y >= map_size.height {
println!(
"A tobogganist finished heading at incline {} x {}, after hitting {} trees",
velocity.x, velocity.y, tree_hit_count.0
);
score.0 *= tree_hit_count.0;
commands.despawn(entity);
}
}
}
fn end_of_slope(
score: Res<Score>,
mut exit_events: ResMut<Events<AppExit>>,
tobogganists: Query<&Tobogganist>,
) {
if tobogganists.iter().count() == 0 {
println!("All tobogganists finished. Total score: {}", score.0);
exit_events.send(AppExit);
}
}
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