use bevy::prelude::*;

pub struct BuildScenePlugin;

impl Plugin for BuildScenePlugin {
    fn build(&self, app: &mut App) {
        app
        .add_startup_system(build_scene)
        .add_system(print_positions);
    }
}


#[derive(Component)]
struct Person;

#[derive(Component)]
struct Position { x: f32, y: f32 }


fn build_scene(mut commands: Commands)  {
    commands.spawn()
    .insert(Person)
    .insert(Position{ x: 10.0, y: 10.0 });
}

fn print_positions(query : Query<&Position>) {
    for position in query.iter() {
        println!("position {:?} {:?}", position.x, position.y)
    }
}