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Vinzenz Schroeter 2024-05-18 22:00:33 +02:00
commit 879ecde430
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12
Cargo.toml Normal file
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[package]
name = "servicepoint-life"
version = "0.1.0"
edition = "2021"
[dependencies]
clap = { version = "4.5.4", features = ["derive"] }
rand = "0.9.0-alpha.1"
env_logger = "0.11.3"
servicepoint2 = "0.4.1"
crossterm = "0.27.0"
log = "0.4.21"

3
README.md Normal file
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# servicepoint-life
More fully featured game of life for the servicepoint display based on the example in the repo.

4
shell.nix Normal file
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{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
nativeBuildInputs = with pkgs.buildPackages; [ rustup cargo pkg-config xe lzma ];
}

167
src/app.rs Normal file
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use std::time::Duration;
use crossterm::event;
use crossterm::event::KeyCode::Modifier;
use crossterm::event::{Event, KeyCode, KeyEvent, KeyEventKind};
use log::{debug, info, warn};
use rand::{distributions, Rng};
use servicepoint2::Command::CharBrightness;
use servicepoint2::{
ByteGrid, Command, CompressionCode, Connection, Origin, PixelGrid, TILE_HEIGHT, TILE_WIDTH,
};
use crate::Cli;
pub(crate) struct App {
connection: Connection,
probability: f64,
field: PixelGrid,
}
impl App {
#[must_use]
pub fn new(connection: Connection, cli: &Cli) -> Self {
Self {
connection,
probability: cli.probability,
field: Self::make_random_field(cli.probability),
}
}
pub fn step(&mut self) -> bool {
self.send_image();
self.change_brightness();
self.field = self.game_iteration();
self.handle_events()
}
fn game_iteration(&self) -> PixelGrid {
let mut next = self.field.clone();
for x in 0..self.field.width() {
for y in 0..self.field.height() {
let old_state = self.field.get(x, y);
let neighbors = self.count_neighbors(x, y);
let new_state =
matches!((old_state, neighbors), (true, 2) | (true, 3) | (false, 3));
next.set(x, y, new_state);
}
}
next
}
fn send_image(&self) {
let command = Command::BitmapLinearWin(
Origin(0, 0),
self.field.clone(),
CompressionCode::Uncompressed,
);
self.connection
.send(command.into())
.expect("could not send");
}
fn count_neighbors(&self, x: usize, y: usize) -> u8 {
let x = x as i32;
let y = y as i32;
let mut count = 0;
for nx in x - 1..=x + 1 {
for ny in y - 1..=y + 1 {
if nx == x && ny == y {
continue; // the cell itself does not count
}
if nx < 0
|| ny < 0
|| nx >= self.field.width() as i32
|| ny >= self.field.height() as i32
{
continue; // pixels outside the grid do not count
}
if !self.field.get(nx as usize, ny as usize) {
continue; // dead cells do not count
}
count += 1;
}
}
count
}
fn make_random_field(probability: f64) -> PixelGrid {
let mut field = PixelGrid::max_sized();
let mut rng = rand::thread_rng();
let d = distributions::Bernoulli::new(probability).unwrap();
for x in 0..field.width() {
for y in 0..field.height() {
field.set(x, y, rng.sample(d));
}
}
field
}
fn handle_events(&mut self) -> bool {
if !event::poll(Duration::from_secs(0)).expect("could not poll") {
return true;
}
match event::read().expect("could not read event") {
Event::Key(key_event) if key_event.kind == KeyEventKind::Press => {
self.handle_key_press(key_event)
}
event => {
debug!("unhandled event {event:?}");
return true;
}
}
}
fn handle_key_press(&mut self, event: KeyEvent) -> bool {
match event.code {
KeyCode::Char('q') => {
warn!("q pressed, terminating");
return false;
}
KeyCode::Char(' ') => {
info!("generating new random field");
self.field = Self::make_random_field(self.probability);
}
key_code => {
debug!("unhandled KeyCode {key_code:?}");
}
}
true
}
fn change_brightness(&self) {
let mut rng = rand::thread_rng();
if !rng.gen_ratio(1, 10) {
return;
}
let min_size = 1;
let x = rng.gen_range(0..TILE_WIDTH - min_size);
let y = rng.gen_range(0..TILE_HEIGHT - min_size);
let w = rng.gen_range(min_size..=TILE_WIDTH - x);
let h = rng.gen_range(min_size..=TILE_HEIGHT - y);
let origin = Origin(x, y);
let mut luma = ByteGrid::new(w as usize, h as usize);
for y in 0..h as usize {
for x in 0..w as usize {
luma.set(x, y, rng.gen());
}
}
self.connection
.send(CharBrightness(origin, luma).into())
.expect("could not send brightness");
}
}

46
src/main.rs Normal file
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use std::time::Duration;
use std::{io, thread};
use clap::Parser;
use crossterm::execute;
use crossterm::terminal::{EnterAlternateScreen, LeaveAlternateScreen};
use log::LevelFilter;
use servicepoint2::Connection;
use crate::app::App;
mod app;
#[derive(Parser, Debug)]
struct Cli {
#[arg(short, long, default_value = "localhost:2342")]
destination: String,
#[arg(short, long, default_value_t = 0.5f64)]
probability: f64,
}
fn main() {
env_logger::builder()
.filter_level(LevelFilter::Info)
.parse_default_env()
.init();
let cli = Cli::parse();
let connection = Connection::open(&cli.destination)
.expect("Could not connect. Did you forget `--destination`?");
let entered_alternate = execute!(io::stdout(), EnterAlternateScreen).is_ok();
crossterm::terminal::enable_raw_mode().expect("could not enable raw terminal mode");
let mut app = App::new(connection, &cli);
while app.step() {
thread::sleep(Duration::from_millis(30));
}
crossterm::terminal::disable_raw_mode().expect("could not disable raw terminal mode");
if entered_alternate {
execute!(io::stdout(), LeaveAlternateScreen).expect("could not leave alternate screen");
}
}