Deploying your Rust WASM Game to Web with Shuttle & Axum 🚀 # Deploying your Rust WASM Game to Web with Shuttle & Axum 🚀 #

    
// Based on code from https://github.com/leudz/shipyard
//
// Original LICENSE:
//
// Copyright 2019 Dylan Ancel
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
use macroquad::{
    color::colors::{BLACK, BLUE, GRAY, GREEN, RED, WHITE, YELLOW},
    input::{is_mouse_button_pressed, mouse_position, show_mouse, MouseButton},
    logging::debug,
    math::{Rect, Vec2},
    rand,
    shapes::draw_rectangle,
    text::{draw_text, measure_text},
    window::{clear_background, next_frame, Conf},
};
use shipyard::{
    AddComponent, AllStoragesViewMut, Component, EntitiesViewMut, IntoIter, IntoWithId,
    IntoWorkload, IntoWorkloadTrySystem, SparseSet, Unique, UniqueView, UniqueViewMut, View,
    ViewMut, Workload, World,
};
 
const WIDTH: i32 = 640;
const HEIGHT: i32 = 360;
const INIT_SIZE: f32 = 5.;
const MAX_SIZE: f32 = 25.;
const GROWTH_RATE: f32 = 0.15;
const SPEED: f32 = 1.5;
const ACCELERATION_RATE: f32 = 0.01;
const SQUARE_SPAWN_RATE: u32 = 25;
const SQUAGUM_SPAWN_RATE: u32 = 150;
 
#[derive(Component)]
struct MyRect(macroquad::prelude::Rect);
 
#[derive(Unique)]
struct Player {
    is_invincible: bool,
    i_counter: u32,
    squagum: bool,
    squagum_counter: u32,
    rect: Rect,
}
 
#[derive(Component)]
struct Squagum(Vec2);
 
#[derive(Component)]
struct Acceleration(f32);
 
#[derive(Component)]
struct ToDelete;
 
#[derive(Debug, Component)]
enum GameOver {
    Lose,
    Victory,
}
 
impl std::error::Error for GameOver {}
 
impl std::fmt::Display for GameOver {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        std::fmt::Debug::fmt(self, f)
    }
}
 
/// generates a new, random square
#[allow(clippy::cast_precision_loss)]
fn new_square() -> (MyRect, Acceleration) {
    (
        MyRect(Rect {
            x: rand::gen_range(MAX_SIZE / 2.0, WIDTH as f32 - MAX_SIZE / 2.),
            y: rand::gen_range(MAX_SIZE / 2.0, WIDTH as f32 - MAX_SIZE / 2.),
            w: INIT_SIZE,
            h: INIT_SIZE,
        }),
        Acceleration(0.),
    )
}
 
fn window_conf() -> Conf {
    Conf {
        window_title: "Square Eater".to_owned(),
        window_width: WIDTH,
        window_height: HEIGHT,
        ..Default::default()
    }
}
 
fn init_world(world: &mut World) {
    let _ = world.remove_unique::<Player>();
 
    world.add_unique(Player {
        is_invincible: false,
        i_counter: 0,
        squagum: false,
        squagum_counter: 0,
        rect: Rect::new(0., 0., INIT_SIZE * 3., INIT_SIZE * 3.),
    });
 
    world.bulk_add_entity((0..7).map(|_| new_square()));
}
 
fn main_loop() -> Workload {
    (
        counters,
        move_player,
        move_square,
        grow_square,
        new_squares,
        collision,
        clean_up.into_workload_try_system().unwrap(),
        render,
    )
        .into_workload()
}
 
// Entry point of the program
#[macroquad::main(window_conf)]
async fn main() {
    let mut world = World::new();
 
    init_world(&mut world);
 
    // seed the random number generator with a random value
    #[allow(clippy::cast_sign_loss, clippy::cast_possible_truncation)]
    rand::srand(macroquad::miniquad::date::now() as u64);
 
    world.add_workload(main_loop);
 
    let mut is_started = false;
    loop {
        if is_started {
            clear_background(WHITE);
 
            if let Err(Some(err)) = world
                .run_default()
                .map_err(shipyard::error::RunWorkload::custom_error)
            {
                match err.downcast_ref::<GameOver>().unwrap() {
                    GameOver::Lose => debug!("GameOver"),
                    GameOver::Victory => debug!("Victory"),
                }
 
                is_started = false;
                world.clear();
                init_world(&mut world);
            }
        } else {
            if is_mouse_button_pressed(MouseButton::Left) {
                is_started = true;
 
                show_mouse(false);
            }
 
            clear_background(BLACK);
 
            let text_dimensions = measure_text("Click to start", None, 40, 1.);
            #[allow(clippy::cast_precision_loss)]
            draw_text(
                "Click to start",
                WIDTH as f32 / 2. - text_dimensions.width / 2.,
                HEIGHT as f32 / 2. - text_dimensions.height / 2.,
                40.,
                WHITE,
            );
        }
        next_frame().await;
    }
}
 
fn counters(mut player: UniqueViewMut<Player>) {
    if player.is_invincible {
        player.i_counter += 1;
 
        if player.i_counter >= 10 {
            player.is_invincible = false;
            player.i_counter = 0;
        }
    }
 
    if player.squagum {
        player.squagum_counter += 1;
 
        if player.squagum_counter >= 120 {
            player.squagum = false;
            player.squagum_counter = 0;
        }
    }
}
 
#[allow(clippy::cast_precision_loss)]
fn move_player(mut player: UniqueViewMut<Player>) {
    let (x, y) = mouse_position();
    player.rect.x = x.clamp(player.rect.w / 2., WIDTH as f32 - player.rect.w / 2.);
    player.rect.y = y.clamp(player.rect.h / 2., HEIGHT as f32 - player.rect.h / 2.);
}
 
fn move_square(
    player: UniqueView<Player>,
    mut rects: ViewMut<MyRect>,
    mut accelerations: ViewMut<Acceleration>,
) {
    for acceleration in (&mut accelerations).iter() {
        acceleration.0 += ACCELERATION_RATE;
    }
 
    let mut dirs = vec![Vec2::ZERO; rects.len()];
 
    for ((id, MyRect(rect)), dir) in rects.iter().with_id().zip(&mut dirs) {
        if rect.w > player.rect.w && rect.h > player.rect.h {
            let player_dir = player.rect.point()
                - Vec2::new(player.rect.w / 2., player.rect.h / 2.)
                - Vec2::new(rect.x - rect.w / 2., rect.y - rect.h / 2.);
 
            *dir = player_dir.normalize();
 
            if player.squagum {
                *dir = -*dir;
            }
 
            let mut neighbourg_dir = Vec2::ZERO;
 
            for MyRect(neighbourg) in rects.iter() {
                if rect.point().distance_squared(neighbourg.point()) < rect.w * rect.h / 1.5 {
                    neighbourg_dir += Vec2::new(rect.x - neighbourg.x, rect.y - neighbourg.y);
                }
            }
 
            if rect.w == MAX_SIZE && rect.h == MAX_SIZE {
                *dir *= SPEED + accelerations[id].0;
            } else {
                *dir *= SPEED;
            }
 
            *dir += rect.point() + neighbourg_dir + 0.05;
 
            #[allow(clippy::cast_precision_loss)]
            {
                dir.x = dir.x.clamp(INIT_SIZE / 2., WIDTH as f32 - INIT_SIZE / 2.);
                dir.y = dir.y.clamp(INIT_SIZE / 2., HEIGHT as f32 - INIT_SIZE / 2.);
            }
        }
    }
 
    for (rect, dir) in (&mut rects).iter().zip(dirs) {
        if dir != Vec2::ZERO {
            rect.0.move_to(dir);
        }
    }
}
 
fn grow_square(mut rects: ViewMut<MyRect>) {
    for rect in (&mut rects).iter() {
        rect.0.w = (rect.0.w + GROWTH_RATE).min(MAX_SIZE);
        rect.0.h = (rect.0.h + GROWTH_RATE).min(MAX_SIZE);
    }
}
 
fn new_squares(
    mut entities: EntitiesViewMut,
    mut rects: ViewMut<MyRect>,
    mut accelerations: ViewMut<Acceleration>,
    mut squagums: ViewMut<Squagum>,
) {
    if rand::gen_range(0, SQUARE_SPAWN_RATE) == 0 {
        entities.add_entity((&mut rects, &mut accelerations), new_square());
    }
 
    #[allow(clippy::cast_precision_loss)]
    if rand::gen_range(0, SQUAGUM_SPAWN_RATE) == 0 {
        entities.add_entity(
            &mut squagums,
            Squagum(Vec2::new(
                rand::gen_range(0.0, WIDTH as f32),
                rand::gen_range(0.0, HEIGHT as f32),
            )),
        );
    }
}
 
fn collision(
    mut player: UniqueViewMut<Player>,
    rects: View<MyRect>,
    squagums: View<Squagum>,
    mut to_delete: ViewMut<ToDelete>,
) {
    for (id, squagum) in squagums.iter().with_id() {
        if player.rect.contains(squagum.0)
            || player
                .rect
                .contains(squagum.0 + Vec2::new(INIT_SIZE, INIT_SIZE))
        {
            player.squagum = true;
            to_delete.add_component_unchecked(id, ToDelete);
        }
    }
 
    for (id, rect) in rects.iter().with_id() {
        if rect.0.w == MAX_SIZE
            && rect.0.h == MAX_SIZE
            && rect.0.x - rect.0.w / 2. <= player.rect.x + player.rect.w / 2.
            && rect.0.x + rect.0.w / 2. >= player.rect.x - player.rect.w / 2.
            && rect.0.y - rect.0.h / 2. <= player.rect.y + player.rect.h / 2.
            && rect.0.y + rect.0.h / 2. >= player.rect.y - player.rect.h / 2.
        {
            if player.squagum {
                player.rect.w = (player.rect.w + INIT_SIZE / 4.).min(MAX_SIZE - 0.01);
                player.rect.h = (player.rect.h + INIT_SIZE / 4.).min(MAX_SIZE - 0.01);
                to_delete.add_component_unchecked(id, ToDelete);
            }
            if !player.is_invincible {
                player.is_invincible = true;
                player.rect.w -= INIT_SIZE / 2.;
                player.rect.h -= INIT_SIZE / 2.;
            }
        } else if player.rect.x >= rect.0.w
            && player.rect.h >= rect.0.h
            && player.rect.x - player.rect.w / 2. <= rect.0.x + rect.0.w / 2.
            && player.rect.x + player.rect.w / 2. >= rect.0.x - rect.0.w / 2.
            && player.rect.y - player.rect.h / 2. <= rect.0.y + rect.0.h / 2.
            && player.rect.y + player.rect.h / 2. >= rect.0.y - rect.0.h / 2.
        {
            player.rect.w = (player.rect.w + INIT_SIZE / 2.).min(MAX_SIZE - 0.01);
            player.rect.h = (player.rect.h + INIT_SIZE / 2.).min(MAX_SIZE - 0.01);
            to_delete.add_component_unchecked(id, ToDelete);
        }
    }
}
 
fn clean_up(mut all_storages: AllStoragesViewMut) -> Result<(), GameOver> {
    all_storages.delete_any::<SparseSet<ToDelete>>();
 
    let (player, rects) = all_storages
        .borrow::<(UniqueView<Player>, View<MyRect>)>()
        .unwrap();
 
    if player.rect.w < INIT_SIZE || player.rect.h < INIT_SIZE {
        Err(GameOver::Lose)
    } else if rects.is_empty() {
        Err(GameOver::Victory)
    } else {
        Ok(())
    }
}
 
fn render(player: UniqueView<Player>, rects: View<MyRect>, squagums: View<Squagum>) {
    for MyRect(rect) in rects.iter() {
        draw_rectangle(
            rect.x - rect.w / 2.,
            rect.y - rect.h / 2.,
            rect.w,
            rect.h,
            if rect.h == MAX_SIZE && rect.w == MAX_SIZE {
                RED
            } else if rect.w > player.rect.w && rect.h > player.rect.h {
                GRAY
            } else {
                GREEN
            },
        );
    }
 
    for squagum in squagums.iter() {
        draw_rectangle(squagum.0.x, squagum.0.y, INIT_SIZE, INIT_SIZE, YELLOW);
    }
 
    draw_rectangle(
        player.rect.x - player.rect.w / 2.,
        player.rect.y - player.rect.h / 2.,
        player.rect.w,
        player.rect.h,
        if player.squagum { YELLOW } else { BLUE },
    );
}