You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/amethyst/examples/sprite_camera_follow
    
    the code of the file until where you have to start completion: use amethyst::{
    assets::{DefaultLoader, Handle, Loader, LoaderBundle, ProcessingQueue},
    core::{
        transform::{Parent, Transform, TransformBundle},
        Named,
    },
    input::{is_close_requested, is_key_down, InputBundle, InputHandler, VirtualKeyCode},
    prelude::*,
    renderer::{
        plugins::{RenderFlat2D, RenderToWind
    
    fn on_start(&mut self, data: StateData<'_, GameData>) {
        let world = data.world;

        let circle_sprite_sheet_handle = load_sprite_sheet(
            data.resources,
            "texture/Circle_Spritesheet.png",
            "texture/Circle_Spritesheet.ron",
        );
        let background_sprite_sheet_handle = load_sprite_sheet(
            data.resources,
            "texture/Background.png",
            "texture/Background.ron",
        );

        init_background_sprite(world, &background_sprite_sheet_handle);
        init_reference_sprite(world, &circle_sprite_sheet_handle);
        let player = init_player(world, &circle_sprite_sheet_handle);
        initialize_camera(world, data.resources, player);
        init_screen_reference_sprite(world, &circle_sprite_sheet_handle);
    }