split main

also:

- update dependencies
- clippy fixes
- metadata

Cargo.lock

@@ -2,15 +2,6 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "aho-corasick"
-version = "1.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "anstream"
 version = "0.6.14"
@@ -202,29 +193,6 @@ dependencies = [
  "litrs",
 ]
 
-[[package]]
-name = "env_filter"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a009aa4810eb158359dda09d0c87378e4bbb89b5a801f016885a4707ba24f7ea"
-dependencies = [
- "log",
- "regex",
-]
-
-[[package]]
-name = "env_logger"
-version = "0.11.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38b35839ba51819680ba087cd351788c9a3c476841207e0b8cee0b04722343b9"
-dependencies = [
- "anstream",
- "anstyle",
- "env_filter",
- "humantime",
- "log",
-]
-
 [[package]]
 name = "errno"
 version = "0.3.11"
@@ -258,12 +226,6 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
-[[package]]
-name = "humantime"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
-
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.0"
@@ -304,12 +266,6 @@ version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
 
-[[package]]
-name = "memchr"
-version = "2.7.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
-
 [[package]]
 name = "mio"
 version = "1.0.3"
@@ -426,35 +382,6 @@ dependencies = [
  "bitflags",
 ]
 
-[[package]]
-name = "regex"
-version = "1.10.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-automata",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-automata"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86b83b8b9847f9bf95ef68afb0b8e6cdb80f498442f5179a29fad448fcc1eaea"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adad44e29e4c806119491a7f06f03de4d1af22c3a680dd47f1e6e179439d1f56"
-
 [[package]]
 name = "rust-lzma"
 version = "0.6.0"
@@ -503,8 +430,6 @@ version = "0.2.0"
 dependencies = [
  "clap",
  "crossterm",
- "env_logger",
- "log",
  "rand",
  "servicepoint",
 ]

Cargo.toml

@@ -12,9 +12,7 @@ rust-version = "1.70.0"
 [dependencies]
 clap = { version = "4.5", features = ["derive"] }
 rand = "0.8"
-env_logger = "0.11"
 crossterm = "0.29"
-log = "0.4"
 
 [dependencies.servicepoint]
 package = "servicepoint"

src/app.rs

@@ -0,0 +1,153 @@
+use crate::{
+    print::{println_debug, println_info, println_warning},
+    simulation::{Simulation, SimulationEvent},
+    Cli,
+};
+use crossterm::{
+    event,
+    event::{Event, KeyCode, KeyEvent, KeyEventKind},
+    execute,
+    terminal::{
+        disable_raw_mode, enable_raw_mode, EnableLineWrap, EnterAlternateScreen,
+        LeaveAlternateScreen,
+    },
+};
+use servicepoint::{
+    Bitmap, BitmapCommand, BrightnessGrid, BrightnessGridCommand, SendCommandExt, UdpSocketExt,
+    FRAME_PACING, TILE_HEIGHT, TILE_WIDTH,
+};
+use std::{
+    io::stdout,
+    net::UdpSocket,
+    thread,
+    time::{Duration, Instant},
+};
+
+pub(crate) struct App {
+    connection: UdpSocket,
+    sim: Simulation,
+    target_duration: Duration,
+    pixels: Bitmap,
+    luma: BrightnessGrid,
+    terminated: bool,
+}
+
+impl App {
+    pub fn new(cli: Cli) -> Self {
+        let connection = UdpSocket::bind_connect(cli.destination)
+            .expect("Could not connect. Did you forget `--destination`?");
+
+        execute!(stdout(), EnterAlternateScreen, EnableLineWrap)
+            .expect("could not enter alternate screen");
+        enable_raw_mode().expect("could not enable raw terminal mode");
+
+        Self {
+            connection,
+            sim: Simulation::new(),
+            terminated: false,
+            target_duration: FRAME_PACING,
+            pixels: Bitmap::max_sized(),
+            luma: BrightnessGrid::new(TILE_WIDTH, TILE_HEIGHT),
+        }
+    }
+
+    pub(crate) fn run_iteration(&mut self) {
+        let start = Instant::now();
+        self.sim.run_iteration();
+
+        self.sim.draw_state(&mut self.pixels, &mut self.luma);
+        let cmd: BitmapCommand = self.pixels.clone().into();
+        self.connection.send_command(cmd).unwrap();
+        let cmd: BrightnessGridCommand = self.luma.clone().into();
+        self.connection.send_command(cmd).unwrap();
+
+        self.poll_events();
+
+        let tick_time = start.elapsed();
+        if tick_time < self.target_duration {
+            thread::sleep(self.target_duration - tick_time);
+        }
+    }
+
+    pub(crate) fn terminated(&self) -> bool {
+        self.terminated
+    }
+
+    fn poll_events(&mut self) -> bool {
+        while event::poll(Duration::from_secs(0)).expect("could not poll") {
+            let event = event::read().expect("could not read event");
+
+            if let Event::Key(KeyEvent {
+                kind: KeyEventKind::Press,
+                code,
+                ..
+            }) = event
+            {
+                if let Some(sim_event) = self.handle_key(code) {
+                    self.sim.handle_event(sim_event);
+                };
+            } else {
+                println_debug(format!("unhandled event {event:?}"));
+            }
+        }
+        false
+    }
+
+    fn handle_key(&mut self, code: KeyCode) -> Option<SimulationEvent> {
+        match code {
+            KeyCode::Char('d') => Some(SimulationEvent::RandomizeLeftPixels),
+            KeyCode::Char('e') => Some(SimulationEvent::RandomizeLeftLuma),
+            KeyCode::Char('f') => Some(SimulationEvent::RandomizeRightPixels),
+            KeyCode::Char('r') => Some(SimulationEvent::RandomizeRightLuma),
+            KeyCode::Right => Some(SimulationEvent::SeparatorAccelerate),
+            KeyCode::Left => Some(SimulationEvent::SeparatorDecelerate),
+            KeyCode::Char('h') => {
+                println_info("[h] help");
+                println_info("[q] quit");
+                println_info("[d] randomize left pixels");
+                println_info("[e] randomize left luma");
+                println_info("[r] randomize right pixels");
+                println_info("[f] randomize right luma");
+                println_info("[→] accelerate divider right");
+                println_info("[←] accelerate divider left");
+                None
+            }
+            KeyCode::Char('q') => {
+                println_warning("terminating");
+                self.terminated = true;
+                None
+            }
+            KeyCode::Up => {
+                self.target_duration = self
+                    .target_duration
+                    .saturating_sub(Duration::from_millis(1));
+                println_info(format!(
+                    "increased simulation speed to {} ups",
+                    1f64 / self.target_duration.as_secs_f64()
+                ));
+                None
+            }
+            KeyCode::Down => {
+                self.target_duration = self
+                    .target_duration
+                    .saturating_add(Duration::from_millis(1));
+                println_info(format!(
+                    "decreased simulation speed to {} ups",
+                    1f64 / self.target_duration.as_secs_f64()
+                ));
+                None
+            }
+            key_code => {
+                println_debug(format!("unhandled KeyCode {key_code:?}"));
+                None
+            }
+        }
+    }
+}
+
+impl Drop for App {
+    fn drop(&mut self) {
+        disable_raw_mode().expect("could not disable raw terminal mode");
+        execute!(stdout(), LeaveAlternateScreen).expect("could not leave alternate screen");
+    }
+}

src/main.rs

@@ -1,39 +1,11 @@
-use std::{
+use crate::app::App;
-    io::stdout,
-    net::UdpSocket,
-    num::Wrapping,
-    thread,
-    time::{Duration, Instant},
-};
-use crate::{
-    game::Game,
-    print::{println_debug, println_info, println_warning},
-    rules::{generate_bb3, generate_u8b3},
-};
 use clap::Parser;
-use crossterm::{
-    event,
-    event::{Event, KeyCode, KeyEventKind},
-    execute,
-    terminal::{
-        disable_raw_mode, enable_raw_mode, EnableLineWrap, EnterAlternateScreen,
-        LeaveAlternateScreen,
-    },
-};
-use log::LevelFilter;
-use rand::{
-    distributions::{Distribution, Standard},
-    Rng,
-};
-use servicepoint::{
-    Bitmap, BitmapCommand, Brightness, BrightnessGrid, BrightnessGridCommand, ByteGrid, Grid,
-    SendCommandExt, UdpSocketExt, ValueGrid, FRAME_PACING, PIXEL_HEIGHT, PIXEL_WIDTH, TILE_HEIGHT,
-    TILE_WIDTH,
-};
 
+mod app;
 mod game;
 mod print;
 mod rules;
+mod simulation;
 
 #[derive(Parser, Debug)]
 struct Cli {
@@ -42,263 +14,8 @@ struct Cli {
 }
 
 fn main() {
-    let connection = init();
+    let mut app = App::new(Cli::parse());
-
+    while !app.terminated() {
-    let mut left_pixels = Game {
+        app.run_iteration();
-        rules: generate_bb3(),
-        field: ValueGrid::new(PIXEL_WIDTH, PIXEL_HEIGHT),
-    };
-    let mut right_pixels = Game {
-        rules: generate_bb3(),
-        field: ValueGrid::new(PIXEL_WIDTH, PIXEL_HEIGHT),
-    };
-    let mut left_luma = Game {
-        rules: generate_u8b3(),
-        field: ByteGrid::new(TILE_WIDTH, TILE_HEIGHT),
-    };
-    let mut right_luma = Game {
-        rules: generate_u8b3(),
-        field: ByteGrid::new(TILE_WIDTH, TILE_HEIGHT),
-    };
-
-    randomize(&mut left_luma.field);
-    randomize(&mut left_pixels.field);
-    randomize(&mut right_luma.field);
-    randomize(&mut right_pixels.field);
-
-    let mut pixels = Bitmap::max_sized();
-    let mut luma = BrightnessGrid::new(TILE_WIDTH, TILE_HEIGHT);
-
-    let mut split_pixel = 0;
-    let mut split_speed: i32 = 1;
-
-    let mut iteration = Wrapping(0u8);
-
-    let mut target_duration = FRAME_PACING;
-
-    loop {
-        let start = Instant::now();
-
-        left_pixels.step();
-        right_pixels.step();
-
-        if iteration % Wrapping(10) == Wrapping(0) {
-            left_luma.step();
-            right_luma.step();
-        }
-
-        iteration += Wrapping(1u8);
-
-        if split_speed > 0 && split_pixel == pixels.width() {
-            split_pixel = 0;
-
-            (left_luma, right_luma) = (right_luma, left_luma);
-            (left_pixels, right_pixels) = (right_pixels, left_pixels);
-
-            randomize(&mut left_pixels.field);
-            randomize(&mut left_luma.field);
-            left_pixels.rules = generate_bb3();
-            left_luma.rules = generate_u8b3();
-        } else if split_speed < 0 && split_pixel == 0 {
-            split_pixel = pixels.width();
-
-            (left_luma, right_luma) = (right_luma, left_luma);
-            (left_pixels, right_pixels) = (right_pixels, left_pixels);
-
-            randomize(&mut right_pixels.field);
-            randomize(&mut right_luma.field);
-            right_pixels.rules = generate_bb3();
-            right_luma.rules = generate_u8b3();
-        }
-
-        split_pixel =
-            i32::clamp(split_pixel as i32 + split_speed, 0, pixels.width() as i32) as usize;
-
-        draw_pixels(
-            &mut pixels,
-            &left_pixels.field,
-            &right_pixels.field,
-            split_pixel,
-        );
-        draw_luma(
-            &mut luma,
-            &left_luma.field,
-            &right_luma.field,
-            split_pixel / 8,
-        );
-        send_to_screen(&connection, &pixels, &luma);
-
-        while event::poll(Duration::from_secs(0)).expect("could not poll") {
-            match event::read().expect("could not read event").try_into() {
-                Err(_) => {}
-                Ok(AppEvent::RandomizeLeftPixels) => {
-                    randomize(&mut left_pixels.field);
-                    println_debug("randomized left pixels");
-                }
-                Ok(AppEvent::RandomizeRightPixels) => {
-                    randomize(&mut right_pixels.field);
-                    println_info("randomized right pixels");
-                }
-                Ok(AppEvent::RandomizeLeftLuma) => {
-                    randomize(&mut left_luma.field);
-                    println_info("randomized left luma");
-                }
-                Ok(AppEvent::RandomizeRightLuma) => {
-                    randomize(&mut right_luma.field);
-                    println_info("randomized right luma");
-                }
-                Ok(AppEvent::SeparatorAccelerate) => {
-                    split_speed += 1;
-                    println_info(format!("increased separator speed to {split_speed}"));
-                }
-                Ok(AppEvent::SeparatorDecelerate) => {
-                    split_speed -= 1;
-                    println_info(format!("decreased separator speed to {split_speed}"));
-                }
-                Ok(AppEvent::Close) => {
-                    println_warning("terminating");
-                    de_init();
-                    return;
-                }
-                Ok(AppEvent::SimulationSpeedUp) => {
-                    target_duration = target_duration.saturating_sub(Duration::from_millis(1));
-                    println_info(format!(
-                        "increased simulation speed to {} ups",
-                        1f64 / target_duration.as_secs_f64()
-                    ));
-                }
-                Ok(AppEvent::SimulationSpeedDown) => {
-                    target_duration = target_duration.saturating_add(Duration::from_millis(1));
-                    println_info(format!(
-                        "decreased simulation speed to {} ups",
-                        1f64 / target_duration.as_secs_f64()
-                    ));
-                }
-            }
-        }
-
-        let tick_time = start.elapsed();
-        if tick_time < target_duration {
-            thread::sleep(target_duration - tick_time);
-        }
     }
 }
-
-enum AppEvent {
-    Close,
-    RandomizeLeftPixels,
-    RandomizeRightPixels,
-    RandomizeLeftLuma,
-    RandomizeRightLuma,
-    SeparatorAccelerate,
-    SeparatorDecelerate,
-    SimulationSpeedUp,
-    SimulationSpeedDown,
-}
-
-impl TryFrom<Event> for AppEvent {
-    type Error = ();
-
-    fn try_from(event: Event) -> Result<Self, Self::Error> {
-        match event {
-            Event::Key(key_event) if key_event.kind == KeyEventKind::Press => {
-                match key_event.code {
-                    KeyCode::Char('h') => {
-                        println_info("[h] help");
-                        println_info("[q] quit");
-                        println_info("[d] randomize left pixels");
-                        println_info("[e] randomize left luma");
-                        println_info("[r] randomize right pixels");
-                        println_info("[f] randomize right luma");
-                        println_info("[→] accelerate divider right");
-                        println_info("[←] accelerate divider left");
-                        Err(())
-                    }
-                    KeyCode::Char('q') => Ok(AppEvent::Close),
-                    KeyCode::Char('d') => Ok(AppEvent::RandomizeLeftPixels),
-                    KeyCode::Char('e') => Ok(AppEvent::RandomizeLeftLuma),
-                    KeyCode::Char('f') => Ok(AppEvent::RandomizeRightPixels),
-                    KeyCode::Char('r') => Ok(AppEvent::RandomizeRightLuma),
-                    KeyCode::Right => Ok(AppEvent::SeparatorAccelerate),
-                    KeyCode::Left => Ok(AppEvent::SeparatorDecelerate),
-                    KeyCode::Up => Ok(AppEvent::SimulationSpeedUp),
-                    KeyCode::Down => Ok(AppEvent::SimulationSpeedDown),
-                    key_code => {
-                        println_debug(format!("unhandled KeyCode {key_code:?}"));
-                        Err(())
-                    }
-                }
-            }
-            event => {
-                println_debug(format!("unhandled event {event:?}"));
-                Err(())
-            }
-        }
-    }
-}
-
-fn draw_pixels(
-    pixels: &mut Bitmap,
-    left: &ValueGrid<bool>,
-    right: &ValueGrid<bool>,
-    split_index: usize,
-) {
-    for x in 0..pixels.width() {
-        let left_or_right = if x < split_index { left } else { right };
-        for y in 0..pixels.height() {
-            let set = x == split_index || left_or_right.get(x, y);
-            pixels.set(x, y, set);
-        }
-    }
-}
-
-fn draw_luma(luma: &mut BrightnessGrid, left: &ByteGrid, right: &ByteGrid, split_tile: usize) {
-    for x in 0..luma.width() {
-        let left_or_right = if x < split_tile { left } else { right };
-        for y in 0..luma.height() {
-            let set: u8 = left_or_right.get(x, y) / u8::MAX * u8::from(Brightness::MAX);
-            let set = Brightness::try_from(set).unwrap();
-            luma.set(x, y, set);
-        }
-    }
-}
-
-fn send_to_screen(connection: &UdpSocket, pixels: &Bitmap, luma: &BrightnessGrid) {
-    let cmd: BitmapCommand = pixels.clone().into();
-    connection.send_command(cmd).unwrap();
-    let cmd: BrightnessGridCommand = luma.clone().into();
-    connection.send_command(cmd).unwrap();
-}
-
-fn randomize<TGrid, TValue>(field: &mut TGrid)
-where
-    TGrid: Grid<TValue>,
-    Standard: Distribution<TValue>,
-{
-    let mut rng = rand::thread_rng();
-
-    for y in 0..field.height() {
-        for x in 0..field.width() {
-            field.set(x, y, rng.gen());
-        }
-    }
-}
-
-fn init() -> UdpSocket {
-    env_logger::builder()
-        .filter_level(LevelFilter::Info)
-        .parse_default_env()
-        .init();
-
-    execute!(stdout(), EnterAlternateScreen, EnableLineWrap)
-        .expect("could not enter alternate screen");
-    enable_raw_mode().expect("could not enable raw terminal mode");
-
-    UdpSocket::bind_connect(Cli::parse().destination)
-        .expect("Could not connect. Did you forget `--destination`?")
-}
-
-fn de_init() {
-    disable_raw_mode().expect("could not disable raw terminal mode");
-    execute!(stdout(), LeaveAlternateScreen).expect("could not leave alternate screen");
-}

src/simulation.rs

@@ -0,0 +1,180 @@
+use crate::{
+    game::Game,
+    print::{println_debug, println_info},
+    rules::{generate_bb3, generate_u8b3},
+};
+use rand::{distributions::Standard, prelude::Distribution, Rng};
+use servicepoint::{
+    Bitmap, Brightness, BrightnessGrid, Grid, Value, ValueGrid, PIXEL_HEIGHT, PIXEL_WIDTH,
+    TILE_HEIGHT, TILE_SIZE, TILE_WIDTH,
+};
+use std::num::Wrapping;
+
+pub(crate) struct Simulation {
+    pub(crate) left_pixels: Game<bool, bool, 3>,
+    pub(crate) right_pixels: Game<bool, bool, 3>,
+    pub(crate) left_luma: Game<u8, bool, 3>,
+    pub(crate) right_luma: Game<u8, bool, 3>,
+    split_pixel: usize,
+    pub(crate) split_speed: i32,
+    iteration: Wrapping<u8>,
+}
+
+pub enum SimulationEvent {
+    RandomizeLeftPixels,
+    RandomizeRightPixels,
+    RandomizeLeftLuma,
+    RandomizeRightLuma,
+    SeparatorAccelerate,
+    SeparatorDecelerate,
+}
+
+impl Simulation {
+    pub fn new() -> Simulation {
+        let left_pixels = Game {
+            rules: generate_bb3(),
+            field: make_randomized(PIXEL_WIDTH, PIXEL_HEIGHT),
+        };
+        let right_pixels = Game {
+            rules: generate_bb3(),
+            field: make_randomized(PIXEL_WIDTH, PIXEL_HEIGHT),
+        };
+        let left_luma = Game {
+            rules: generate_u8b3(),
+            field: make_randomized(TILE_WIDTH, TILE_HEIGHT),
+        };
+        let right_luma = Game {
+            rules: generate_u8b3(),
+            field: make_randomized(TILE_WIDTH, TILE_HEIGHT),
+        };
+
+        Self {
+            left_pixels,
+            right_pixels,
+            left_luma,
+            right_luma,
+            split_pixel: 0,
+            split_speed: 1,
+            iteration: Wrapping(0u8),
+        }
+    }
+
+    fn swap_left_right(&mut self) {
+        std::mem::swap(&mut self.left_luma, &mut self.right_luma);
+        std::mem::swap(&mut self.left_pixels, &mut self.right_pixels);
+    }
+
+    fn regenerate(pixels: &mut Game<bool, bool, 3>, luma: &mut Game<u8, bool, 3>) {
+        randomize(&mut pixels.field);
+        randomize(&mut luma.field);
+        pixels.rules = generate_bb3();
+        luma.rules = generate_u8b3();
+    }
+
+    pub(crate) fn run_iteration(&mut self) {
+        self.left_pixels.step();
+        self.right_pixels.step();
+
+        if self.iteration % Wrapping(10) == Wrapping(0) {
+            self.left_luma.step();
+            self.right_luma.step();
+        }
+
+        self.iteration += Wrapping(1u8);
+
+        if self.split_speed > 0 && self.split_pixel == self.left_pixels.field.width() {
+            self.split_pixel = 0;
+            self.swap_left_right();
+            Self::regenerate(&mut self.left_pixels, &mut self.left_luma);
+        } else if self.split_speed < 0 && self.split_pixel == 0 {
+            self.split_pixel = self.left_pixels.field.width();
+            self.swap_left_right();
+            Self::regenerate(&mut self.right_pixels, &mut self.right_luma);
+        }
+
+        self.split_pixel = i32::clamp(
+            self.split_pixel as i32 + self.split_speed,
+            0,
+            self.left_pixels.field.width() as i32,
+        ) as usize;
+    }
+
+    pub(crate) fn draw_state(&self, pixels: &mut Bitmap, luma: &mut BrightnessGrid) {
+        for x in 0..pixels.width() {
+            let left_or_right = if x < self.split_pixel {
+                &self.left_pixels.field
+            } else {
+                &self.right_pixels.field
+            };
+            for y in 0..pixels.height() {
+                let set = x == self.split_pixel || left_or_right.get(x, y);
+                pixels.set(x, y, set);
+            }
+        }
+
+        let split_tile = self.split_pixel / TILE_SIZE;
+        for x in 0..luma.width() {
+            let left_or_right = if x < split_tile {
+                &self.left_luma.field
+            } else {
+                &self.right_luma.field
+            };
+            for y in 0..luma.height() {
+                let set: u8 = left_or_right.get(x, y) / u8::MAX * u8::from(Brightness::MAX);
+                let set = Brightness::try_from(set).unwrap();
+                luma.set(x, y, set);
+            }
+        }
+    }
+
+    pub(crate) fn handle_event(&mut self, event: SimulationEvent) {
+        match event {
+            SimulationEvent::RandomizeLeftPixels => {
+                randomize(&mut self.left_pixels.field);
+                println_debug("randomized left pixels");
+            }
+            SimulationEvent::RandomizeRightPixels => {
+                randomize(&mut self.right_pixels.field);
+                println_info("randomized right pixels");
+            }
+            SimulationEvent::RandomizeLeftLuma => {
+                randomize(&mut self.left_luma.field);
+                println_info("randomized left luma");
+            }
+            SimulationEvent::RandomizeRightLuma => {
+                randomize(&mut self.right_luma.field);
+                println_info("randomized right luma");
+            }
+            SimulationEvent::SeparatorAccelerate => {
+                self.split_speed += 1;
+                println_info(format!("increased separator speed to {}", self.split_speed));
+            }
+            SimulationEvent::SeparatorDecelerate => {
+                self.split_speed -= 1;
+                println_info(format!("decreased separator speed to {}", self.split_speed));
+            }
+        }
+    }
+}
+
+fn make_randomized<T: Value>(width: usize, height: usize) -> ValueGrid<T>
+where
+    Standard: Distribution<T>,
+{
+    let mut pixels = ValueGrid::new(width, height);
+    randomize(&mut pixels);
+    pixels
+}
+
+fn randomize<T: Value>(field: &mut ValueGrid<T>)
+where
+    Standard: Distribution<T>,
+{
+    let mut rng = rand::thread_rng();
+
+    for y in 0..field.height() {
+        for x in 0..field.width() {
+            field.set(x, y, rng.gen());
+        }
+    }
+}