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|
use bevy::math::Vec3;
use bevy::prelude::*;
use rand::{
distributions::{Distribution, Standard},
Rng,
};
#[derive(Debug, PartialEq, Clone)]
enum Occupant {
None,
Green,
Yellow,
Red,
Diamond,
}
impl Occupant {
pub fn to_index(&self) -> u32 {
match self {
Occupant::Green => 0,
Occupant::Yellow => 1,
Occupant::Red => 2,
Occupant::Diamond => 3,
Occupant::None => 13,
}
}
}
impl Distribution<Occupant> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Occupant {
match rng.gen_range(0..=3) {
0 => Occupant::Green,
1 => Occupant::Yellow,
2 => Occupant::Diamond,
3 => Occupant::Red,
_ => Occupant::None,
}
}
}
#[derive(Debug, Clone)]
struct Cell {
x: u8,
y: u8,
occupant: Occupant,
}
impl Cell {
pub fn new(x: u8, y: u8) -> Cell {
Cell {
x,
y,
occupant: Occupant::None,
}
}
}
fn cell_insert_system(mut cell_query: Query<(&mut Cell, &mut TextureAtlasSprite)>) {
for (mut cell, mut sprite) in cell_query.iter_mut() {
if cell.occupant == Occupant::None {
if cell.y == 7 {
cell.occupant = rand::random();
sprite.index = cell.occupant.to_index();
}
}
}
}
fn cell_falling_system(mut cell_query: Query<(&mut Cell, &mut TextureAtlasSprite)>) {
let mut have_gems = Vec::new();
for (cell, _sprite) in cell_query.iter_mut() {
if cell.occupant != Occupant::None {
have_gems.push(cell.clone());
}
}
let mut moved_gems = Vec::new();
for (mut cell, mut sprite) in cell_query.iter_mut() {
if cell.occupant == Occupant::None {
if let Some(c) = have_gems
.iter()
.find(|&c| (c.x, c.y) == (cell.x, cell.y + 1))
{
cell.occupant = c.occupant.clone();
sprite.index = cell.occupant.to_index();
moved_gems.push(c.clone());
}
}
}
for (mut cell, mut sprite) in cell_query.iter_mut() {
if moved_gems.iter().any(|c| (c.x, c.y) == (cell.x, cell.y)) {
cell.occupant = Occupant::None;
sprite.index = cell.occupant.to_index();
}
}
}
pub fn setup(
commands: &mut Commands,
asset_server: Res<AssetServer>,
mut materials: ResMut<Assets<ColorMaterial>>,
mut texture_atlases: ResMut<Assets<TextureAtlas>>,
) {
let background = asset_server.load("background.png");
let tileset = asset_server.load("tileset.png");
let atlas = TextureAtlas::from_grid(tileset, Vec2::new(16.0, 16.0), 4, 4);
let atlas_handle = texture_atlases.add(atlas);
commands
.spawn(Camera2dBundle::default())
.spawn(SpriteBundle {
material: materials.add(background.into()),
transform: Transform {
translation: Vec3 {
x: 50.0,
y: 0.0,
z: 0.0,
},
scale: Vec3::splat(3.5),
..Default::default()
},
..Default::default()
})
.spawn(SpriteSheetBundle {
sprite: TextureAtlasSprite::new(8),
texture_atlas: atlas_handle.clone(),
transform: Transform {
translation: Vec3 {
x: 225.0,
y: -200.0,
z: 0.0,
},
scale: Vec3::splat(3.5),
..Default::default()
},
..Default::default()
})
.spawn(SpriteSheetBundle {
sprite: TextureAtlasSprite::new(12),
texture_atlas: atlas_handle.clone(),
transform: Transform {
translation: Vec3 {
x: 225.0,
y: -200.0 + (-16.0) * 3.5,
z: 0.0,
},
scale: Vec3::splat(3.5),
..Default::default()
},
..Default::default()
});
for i in 0..8 {
for j in 0..8 {
commands
.spawn(SpriteSheetBundle {
texture_atlas: atlas_handle.clone(),
sprite: TextureAtlasSprite::new(11),
transform: Transform {
translation: Vec3 {
x: ((i as f32) * 16.0 * 3.5) - 320.0,
y: ((j as f32) * 16.0 * 3.5) - 160.0,
z: 0.0,
},
scale: Vec3::splat(3.5),
..Default::default()
},
..Default::default()
})
.with(Cell::new(i, j));
}
}
}
pub struct GemsPlugin;
impl Plugin for GemsPlugin {
fn build(&self, app: &mut AppBuilder) {
app.add_startup_system(setup.system());
app.add_system(cell_insert_system.system());
app.add_system(cell_falling_system.system());
}
}
pub fn main() {
App::build()
.add_resource(WindowDescriptor {
title: "gems".to_string(),
width: 800.0,
height: 600.0,
resizable: false,
..Default::default()
})
.add_plugins(DefaultPlugins)
.add_plugin(GemsPlugin)
.run();
}
|
