snake/src/main.rs

use std::default::Default;

use bevy::core::FixedTimestep;
use bevy::prelude::*;
use bevy::render::pass::ClearColor;

pub mod components;
use crate::components as c;
pub mod game;
pub mod snake;

fn main() {
    App::build()
        .insert_resource(WindowDescriptor {
            title: "Snake!".to_string(),
            width: 500.0,
            height: 500.0,
            ..Default::default()
        })
        .insert_resource(ClearColor(Color::rgb(0.04, 0.04, 0.04)))
        .insert_resource(c::SnakeSegments::default())
        .insert_resource(c::LastTailPosition::default())
        .add_startup_system(game::setup.system())
        .add_startup_stage("game_setup", SystemStage::single(snake::spawn.system()))
        .add_plugins(DefaultPlugins)
        .add_system(
            snake::input
                .system()
                .label(c::SnakeMovement::Input)
                .before(c::SnakeMovement::Movement),
        )
        .add_system(snake::die.system().after(c::SnakeMovement::Movement))
        .add_system_set(
            SystemSet::new()
                .with_run_criteria(FixedTimestep::step(0.3))
                .with_system(snake::movement.system().label(c::SnakeMovement::Movement))
                .with_system(
                    snake::eating
                        .system()
                        .label(c::SnakeMovement::Eating)
                        .after(c::SnakeMovement::Movement),
                )
                .with_system(
                    snake::growth
                        .system()
                        .label(c::SnakeMovement::Growth)
                        .after(c::SnakeMovement::Eating),
                ),
        )
        .add_system_set_to_stage(
            CoreStage::PostUpdate,
            SystemSet::new()
                .with_system(game::position_translation.system())
                .with_system(game::size_scaling.system()),
        )
        .add_system_set(
            SystemSet::new()
                .with_run_criteria(FixedTimestep::step(0.9))
                .with_system(snake::food.system()),
        )
        .add_event::<c::GrowthEvent>()
        .add_event::<c::GameOverEvent>()
        .run();
}