init: set your eyes

.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# Configuration file 
+settings.*
+
+.idea

Cargo.toml

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+[package]
+name = "lj_templates_rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+
+[dependencies]
+chrono = "0.4.26"
+config = "0.13.3"
+ctrlc = "3.4.0"
+env_logger = "0.10.0"
+log = "0.4.18"
+redis = "0.23.0"
+toml = "0.7.4"
+serde = { version = "1.0.163", features = ["derive"] }

README.md

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+# LJ Template for Rust
+
+**This project is a basic program for building rust programs compatible with the protonphoton LJ project.** 
+
+Use this code as a basis and let the laser points be with you.
+
+**Crash course**
+
+```
+
+$ git clone https://git.interhacker.space/protonphoton/lj_templates_rust && cd lj_templates_rust
+
+# Create a settings file, see the content for more details including redis server url 
+$ cp copyme.settings.toml settings.toml && $EDITOR settings.toml
+
+# Run the projet
+$ cargo run
+
+```
+
+## Associate projects
+
+**The LJ rust tracer projet and the nannou visualiser might be of help to simulate your project.**
+
+Todo: make a full tutorial for that

copyme.settings.toml

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+# file: settings.toml
+# Rename me !
+
+# The main key of your laser in LJ
+laser_id = 0
+
+# Your client id in LJ
+client_id = 0
+
+# Activate for more debug 
+debug = true
+
+# How many Frames Per Second
+framerate = 20
+
+# Redis URL as redis://IP:port/
+redis_url = "redis://127.0.0.1:6379/"

src/conf.rs

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+use std::error::Error;
+use config::Config;
+use serde::{Serialize, Deserialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct Conf {
+	pub debug: bool,
+	pub laser_id: u8,
+	pub client_id: u8,
+	pub redis_url: String,
+	pub framerate: u8,
+}
+
+
+impl Conf {
+	pub fn new(path: &str) -> Result<Conf, Box<dyn Error>> {
+		let settings = Config::builder()
+			.add_source(config::File::with_name(path))
+			.build()?;
+		let conf: Conf = settings.try_deserialize()?;
+		Ok(conf)
+	}
+
+}

src/draw.rs

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+// This is where you can put your custom code
+
+use crate::{Color, Point};
+
+const RADIUS: f32 = 2000.0;
+const X_CENTER: f32 = 2047.0;
+const Y_CENTER: f32 = 2047.0;
+
+pub fn draw() -> Result<Vec<Point>, Box<dyn std::error::Error>> {
+	let mut v: Vec<Point> = vec![];
+	for i in 0..128 {
+		let a = i as f32 / 128.0 * std::f32::consts::PI * 2.0;
+		v.push(Point {
+			x: (X_CENTER + a.cos() * RADIUS) as f32,
+			y: (Y_CENTER + a.sin() * RADIUS) as f32,
+			color: Color { r: 255, g: 255, b: 255 },
+		});
+	}
+	Ok(v)
+}

src/framerate.rs

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+use log::{debug, warn};
+use std::time::{Duration, Instant};
+use std::{thread};
+
+/// Converts helios Geometry to Helios
+#[derive(Debug, Clone, Copy)]
+pub struct Framerate {
+	prev_trace_time: Instant,
+	framerate: u8,
+}
+
+impl Framerate {
+	pub fn new(framerate: u8) -> Result<Self, Box<dyn std::error::Error>> {
+		Ok(Framerate {
+			prev_trace_time: Instant::now(),
+			framerate,
+		})
+	}
+	pub fn handle_time(&mut self) -> Result<(), Box<dyn std::error::Error>> {
+		let frame_time = 1000000000 / self.framerate as u128;
+		let now = Instant::now();
+		// How long since last loop ?
+		let nanotime_spent = self.prev_trace_time.elapsed().as_nanos();
+		// Diw it go too fast? If so : sleep a bit
+		if frame_time > nanotime_spent {
+			let nanotime_towait = frame_time - nanotime_spent;
+			let dur = Duration::new(0, (nanotime_towait as f32 * 0.9) as u32);
+			// debug!("{:?} - {:?} : {:?}", nanotime_towait, self.prev_trace_time, now );
+			thread::sleep(dur);
+			// debug!("Framerate OK");
+		} else {
+			warn!("Frame slower than expected {:?} > {:?}", nanotime_spent, frame_time, );
+		}
+
+		self.prev_trace_time = now;
+		Ok(())
+	}
+}

src/logs.rs

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+use env_logger::Builder;
+use log::LevelFilter;
+use crate::Conf;
+
+pub fn init_logging(config: &Result<Conf, Box<dyn std::error::Error>>) {
+	if let Ok(ref config) = config {
+		let level = if config.debug {
+			LevelFilter::Debug
+		} else {
+			LevelFilter::Info
+		};
+		let mut builder = Builder::from_default_env();
+		builder
+			.filter(None, level)
+			.init();
+		return;
+	}
+	env_logger::init();
+}

src/main.rs

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+///
+/// Configure udev:
+/// https://github.com/Grix/helios_dac/blob/master/docs/udev_rules_for_linux.md
+///
+mod conf;
+mod point;
+mod draw;
+mod logs;
+mod framerate;
+
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+use conf::Conf;
+use point::{Point, Color};
+use log::{info, /* warn, */ error};
+use redis::{Client, Commands, Connection};
+use logs::init_logging;
+
+const DEFAULT_CONF_FILE: &str = "settings.toml";
+
+pub fn main() {
+	match run_all() {
+		Ok(()) => {}
+		Err(err) => {
+			error!("Error: {}", err);
+		}
+	}
+}
+
+
+fn run_all() -> Result<(), Box<dyn std::error::Error>> {
+	// Setup handler for interrupt Signals
+	let running = Arc::new(AtomicBool::new(true));
+	let r = running.clone();
+	ctrlc::set_handler(move || {
+		r.store(false, Ordering::SeqCst);
+	})?;
+
+	// Setup configuration file and set up logs
+	let filename = std::env::args().nth(1).unwrap_or_else(|| { DEFAULT_CONF_FILE.to_string() });
+	let config = Conf::new(&filename);
+	init_logging(&config);
+	let config = config?;
+
+	let client = Client::open(config.redis_url.clone())?;
+	let mut con: Connection = client.get_connection()?;
+
+	let mut framerate_handler = framerate::Framerate::new( config.framerate )?;
+
+	info!("*** Starting up ***");
+	info!("{:?}", config);
+
+	// Dispatch based on redis requests
+	while running.load(Ordering::SeqCst) {
+		let _ = framerate_handler.handle_time();
+		let points_list: Vec<Point> = draw::draw()?;
+		let v: Vec<(f32, f32, u32)> = points_list.iter().map(|pt| {
+			(pt.x, pt.y, u32::from(pt.color))
+		}
+		).collect();
+		// println!("{:?}", v);
+		let _ = con.set(format!("/pl/{}/{}", config.client_id, config.laser_id), format!("{:?}", v))?;
+	}
+	Ok(())
+}
+

src/point.rs

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+pub type Line = Vec<(f32, f32, u32)>;
+
+#[derive(Debug, Clone, Copy, Default, PartialEq)]
+pub struct Point {
+	pub x: f32,
+	pub y: f32,
+	pub color: Color,
+}
+
+#[derive(Debug, Clone, Copy, Default, PartialEq)]
+pub struct Color {
+	pub r: u8,
+	pub g: u8,
+	pub b: u8,
+}
+
+impl From<Color> for u32 {
+	fn from(value: Color) -> Self {
+		let r = value.r as u32;
+		let g = value.g as u32;
+		let b = (value.b) as u32;
+		(r << 16) + (g << 8) + b
+	}
+}
+
+
+impl From<(f32, f32, u32)> for Point {
+	fn from((x, y, color): (f32, f32, u32)) -> Point {
+		let r = (color >> 16) as u8;
+		let g = ((color >> 8) & 255) as u8;
+		let b = (color & 255) as u8;
+		Point { x, y, color: Color { r, g, b } }
+	}
+}
+
+impl From<Point>  for (f32, f32, u32) {
+	fn from(pt : Point  ) -> (f32, f32, u32) {
+		(pt.x,pt.y,pt.color.into())
+	}
+}