protostar/examples/hexagon_launcher.rs

use color_eyre::eyre::Result;
use glam::Quat;
use manifest_dir_macros::directory_relative_path;
use mint::Vector3;
use protostar::{
	protostar::ProtoStar,
	xdg::{get_desktop_files, parse_desktop_file, DesktopFile},
};
use stardust_xr_molecules::fusion::{
	client::{Client, FrameInfo, RootHandler},
	spatial::Spatial, drawable::{Text, TextStyle, Bounds, TextFit, Alignment}, core::values::Transform,
};
use tween::TweenTime;

const APP_SIZE: f32 = 0.065;
#[derive(Clone)]
struct Hex {
	q: isize,
	r: isize,
	s: isize,
}

const HEX_CENTER: Hex = Hex{q:0,r:0,s:0};
const HEX_DIRECTION_VECTORS: [Hex; 6] = [
    Hex{q:1, r:0, s:-1}, Hex{q:1, r:-1, s:0}, Hex{q:0, r:-1, s:1}, 
    Hex{q:-1, r:0, s:1}, Hex{q:-1, r:1, s:0}, Hex{q:0, r:1, s:-1}, 
];

impl Hex {
	fn new(q:isize, r:isize, s:isize) -> Self{
		Hex{q:q, r:r, s:s}
	}

	fn get_coords(&self) -> [f32; 3]{
		let x = 3.0/2.0 * APP_SIZE/2.0 * (-self.q-self.s).to_f32();
        let y = 3.0_f32.sqrt() * APP_SIZE/2.0 * ( (-self.q-self.s).to_f32()/2.0 + self.s.to_f32());
		[x,y,0.0]
	}

	fn add(self, vec:&Hex) -> Self{
		Hex::new(self.q + vec.q, self.r + vec.r, self.s + vec.s)
	}

	fn neighbor(self, direction:usize) -> Self{
		self.add(&HEX_DIRECTION_VECTORS[direction])
	}

	fn scale(self, factor:isize) -> Self {
		Hex::new(self.q * factor, self.r * factor, self.s * factor)
	}
}

#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<()> {
	color_eyre::install().unwrap();
	tracing_subscriber::fmt()
		.with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
		.pretty()
		.init();
	let (client, event_loop) = Client::connect_with_async_loop().await?;
	client.set_base_prefixes(&[directory_relative_path!("res")]);

	let _root = client.wrap_root(AppHexGrid::new(&client))?;

	tokio::select! {
		_ = tokio::signal::ctrl_c() => (),
		e = event_loop => e??,
	};
	Ok(())
}

struct AppHexGrid {
	apps: Vec<App>,
}
impl AppHexGrid {

	fn new(client: &Client) -> Self {
		let mut desktop_files: Vec<DesktopFile> = get_desktop_files()
			.into_iter()
			.filter_map(|d| parse_desktop_file(d).ok())
			.filter(|d| !d.no_display)
			.collect();

		desktop_files.sort_by_key(|d| d.clone().name.unwrap());

		let mut apps = Vec::new();
        let mut radius = 1;
		while !desktop_files.is_empty() {
			let mut hex = HEX_CENTER.add(&HEX_DIRECTION_VECTORS[4].clone().scale(radius));
            for i in 0..6{
				if desktop_files.is_empty() {break};
				for _ in 0..radius{
					if desktop_files.is_empty() {break};
	        		apps.push(App::new(client.get_root(),hex.get_coords(),desktop_files.pop().unwrap()).unwrap());
                    hex = hex.neighbor(i);
				}	
			}
			radius += 1;
    	}
		AppHexGrid { apps }
	}
}
impl RootHandler for AppHexGrid {
	fn frame(&mut self, info: FrameInfo) {
		for app in &mut self.apps {
			app.frame(info);
		}
	}
}
struct App {
	_text: Text,
	_desktop_file: DesktopFile,
	protostar: ProtoStar,
}

impl App {
	fn new(
		parent: &Spatial,
		position: impl Into<Vector3<f32>>,
		desktop_file: DesktopFile,
	) -> Option<Self> {
		let position = position.into();
		let style= TextStyle {
			character_height: APP_SIZE * 0.1,
			bounds: Some(Bounds {
				bounds: [APP_SIZE; 2].into(),
				fit: TextFit::Wrap,
				bounds_align: Alignment::XCenter | Alignment::YCenter,
			}),
			text_align: Alignment::XCenter | Alignment::YCenter,
			..Default::default()
		};
		let protostar = ProtoStar::create_from_desktop_file(parent, desktop_file.clone()).ok()?;
		let text = Text::create(
		 	protostar.content_parent(),
		 	Transform::from_position_rotation(
		 		[0.0, 0.0, 0.004],
		 		Quat::from_rotation_y(3.14),
		 	),
		 	desktop_file.name.as_deref().unwrap_or("Unknown"),
		 	style,
		 )
		 .unwrap();
		protostar
			.content_parent()
			.set_position(None, position)
			.unwrap();
		Some(App {
			_text: text,
			_desktop_file: desktop_file,
			protostar,
		})
	}
}
impl RootHandler for App {
	fn frame(&mut self, info: FrameInfo) {
		self.protostar.frame(info);
	}
}