414 lines
13 KiB
Rust
414 lines
13 KiB
Rust
//! This example showcases an interactive version of the Game of Life, invented
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//! by John Conway. It leverages a `Canvas` together with other widgets.
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mod style;
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mod time;
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use grid::Grid;
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use iced::{
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button::{self, Button},
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executor,
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slider::{self, Slider},
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Align, Application, Column, Command, Container, Element, Length, Row,
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Settings, Subscription, Text,
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};
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use std::time::{Duration, Instant};
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pub fn main() {
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GameOfLife::run(Settings::default())
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}
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#[derive(Default)]
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struct GameOfLife {
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grid: Grid,
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is_playing: bool,
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speed: u64,
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next_speed: Option<u64>,
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toggle_button: button::State,
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next_button: button::State,
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clear_button: button::State,
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speed_slider: slider::State,
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}
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#[derive(Debug, Clone)]
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enum Message {
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Grid(grid::Message),
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Tick(Instant),
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Toggle,
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Next,
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Clear,
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SpeedChanged(f32),
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}
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impl Application for GameOfLife {
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type Message = Message;
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type Executor = executor::Default;
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type Flags = ();
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fn new(_flags: ()) -> (Self, Command<Message>) {
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(
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Self {
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speed: 1,
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..Self::default()
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},
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Command::none(),
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)
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}
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fn title(&self) -> String {
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String::from("Game of Life - Iced")
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}
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fn update(&mut self, message: Message) -> Command<Message> {
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match message {
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Message::Grid(message) => {
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self.grid.update(message);
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}
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Message::Tick(_) | Message::Next => {
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self.grid.tick();
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if let Some(speed) = self.next_speed.take() {
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self.speed = speed;
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}
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}
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Message::Toggle => {
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self.is_playing = !self.is_playing;
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}
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Message::Clear => {
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self.grid = Grid::default();
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}
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Message::SpeedChanged(speed) => {
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if self.is_playing {
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self.next_speed = Some(speed.round() as u64);
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} else {
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self.speed = speed.round() as u64;
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}
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}
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}
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Command::none()
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}
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fn subscription(&self) -> Subscription<Message> {
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if self.is_playing {
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time::every(Duration::from_millis(1000 / self.speed))
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.map(Message::Tick)
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} else {
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Subscription::none()
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}
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}
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fn view(&mut self) -> Element<Message> {
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let playback_controls = Row::new()
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.spacing(10)
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.push(
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Button::new(
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&mut self.toggle_button,
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Text::new(if self.is_playing { "Pause" } else { "Play" }),
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)
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.on_press(Message::Toggle)
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.style(style::Button),
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)
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.push(
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Button::new(&mut self.next_button, Text::new("Next"))
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.on_press(Message::Next)
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.style(style::Button),
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)
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.push(
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Button::new(&mut self.clear_button, Text::new("Clear"))
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.on_press(Message::Clear)
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.style(style::Button),
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);
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let selected_speed = self.next_speed.unwrap_or(self.speed);
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let speed_controls = Row::new()
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.spacing(10)
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.push(
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Slider::new(
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&mut self.speed_slider,
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1.0..=20.0,
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selected_speed as f32,
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Message::SpeedChanged,
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)
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.width(Length::Units(200))
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.style(style::Slider),
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)
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.push(Text::new(format!("x{}", selected_speed)).size(16))
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.align_items(Align::Center);
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let controls = Row::new()
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.padding(10)
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.spacing(20)
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.push(playback_controls)
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.push(speed_controls);
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let content = Column::new()
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.spacing(10)
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.align_items(Align::Center)
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.push(self.grid.view().map(Message::Grid))
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.push(controls);
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Container::new(content)
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.width(Length::Fill)
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.height(Length::Fill)
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.style(style::Container)
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.into()
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}
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}
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mod grid {
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use iced::{
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canvas::{self, Canvas, Cursor, Event, Frame, Geometry, Path},
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mouse, Color, Element, Length, MouseCursor, Point, Rectangle, Size,
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Vector,
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};
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use std::collections::{HashMap, HashSet};
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const CELL_SIZE: usize = 20;
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#[derive(Default)]
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pub struct Grid {
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alive_cells: HashSet<(isize, isize)>,
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interaction: Option<Interaction>,
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cache: canvas::Cache,
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translation: Vector,
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}
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#[derive(Debug, Clone, Copy)]
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pub enum Message {
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Populate { cell: (isize, isize) },
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}
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enum Interaction {
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Drawing,
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Panning { translation: Vector, start: Point },
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}
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impl Grid {
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fn with_neighbors(
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i: isize,
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j: isize,
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) -> impl Iterator<Item = (isize, isize)> {
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use itertools::Itertools;
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let rows = i.saturating_sub(1)..=i.saturating_add(1);
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let columns = j.saturating_sub(1)..=j.saturating_add(1);
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rows.cartesian_product(columns)
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}
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pub fn tick(&mut self) {
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use itertools::Itertools;
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let populated_neighbors: HashMap<(isize, isize), usize> = self
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.alive_cells
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.iter()
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.flat_map(|&(i, j)| Self::with_neighbors(i, j))
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.unique()
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.map(|(i, j)| ((i, j), self.populated_neighbors(i, j)))
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.collect();
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for (&(i, j), amount) in populated_neighbors.iter() {
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let is_populated = self.alive_cells.contains(&(i, j));
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match amount {
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2 | 3 if is_populated => {}
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3 => {
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let _ = self.alive_cells.insert((i, j));
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}
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_ if is_populated => {
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let _ = self.alive_cells.remove(&(i, j));
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}
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_ => {}
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}
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}
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self.cache.clear()
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}
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pub fn update(&mut self, message: Message) {
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match message {
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Message::Populate { cell } => {
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self.alive_cells.insert(cell);
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self.cache.clear()
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}
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}
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}
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pub fn view<'a>(&'a mut self) -> Element<'a, Message> {
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Canvas::new(self)
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.width(Length::Fill)
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.height(Length::Fill)
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.into()
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}
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fn populated_neighbors(&self, row: isize, column: isize) -> usize {
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let with_neighbors = Self::with_neighbors(row, column);
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let is_neighbor = |i: isize, j: isize| i != row || j != column;
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let is_populated =
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|i: isize, j: isize| self.alive_cells.contains(&(i, j));
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with_neighbors
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.filter(|&(i, j)| is_neighbor(i, j) && is_populated(i, j))
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.count()
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}
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fn cell_at(&self, position: Point) -> Option<(isize, isize)> {
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let i = (position.y / CELL_SIZE as f32).ceil() as isize;
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let j = (position.x / CELL_SIZE as f32).ceil() as isize;
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Some((i.saturating_sub(1), j.saturating_sub(1)))
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}
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}
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impl<'a> canvas::Program<Message> for Grid {
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fn update(
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&mut self,
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event: Event,
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bounds: Rectangle,
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cursor: Cursor,
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) -> Option<Message> {
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if let Event::Mouse(mouse::Event::ButtonReleased(_)) = event {
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self.interaction = None;
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}
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let cursor_position = cursor.position_in(&bounds)?;
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let cell = self.cell_at(cursor_position - self.translation)?;
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let populate = if self.alive_cells.contains(&cell) {
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None
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} else {
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Some(Message::Populate { cell })
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};
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match event {
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Event::Mouse(mouse_event) => match mouse_event {
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mouse::Event::ButtonPressed(button) => match button {
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mouse::Button::Left => {
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self.interaction = Some(Interaction::Drawing);
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populate
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}
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mouse::Button::Right => {
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self.interaction = Some(Interaction::Panning {
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translation: self.translation,
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start: cursor_position,
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});
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None
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}
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_ => None,
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},
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mouse::Event::CursorMoved { .. } => {
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match self.interaction {
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Some(Interaction::Drawing) => populate,
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Some(Interaction::Panning {
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translation,
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start,
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}) => {
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self.translation =
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translation + (cursor_position - start);
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self.cache.clear();
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None
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}
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_ => None,
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}
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}
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_ => None,
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},
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}
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}
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fn draw(&self, bounds: Rectangle, cursor: Cursor) -> Vec<Geometry> {
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let cell_size = Size::new(1.0, 1.0);
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let life = self.cache.draw(bounds.size(), |frame| {
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let background = Path::rectangle(Point::ORIGIN, frame.size());
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frame.fill(
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&background,
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Color::from_rgb(
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0x40 as f32 / 255.0,
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0x44 as f32 / 255.0,
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0x4B as f32 / 255.0,
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),
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);
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let first_row =
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(-self.translation.y / CELL_SIZE as f32).floor() as isize;
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let first_column =
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(-self.translation.x / CELL_SIZE as f32).floor() as isize;
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let visible_rows =
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(frame.height() / CELL_SIZE as f32).ceil() as isize;
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let visible_columns =
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(frame.width() / CELL_SIZE as f32).ceil() as isize;
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frame.with_save(|frame| {
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frame.translate(self.translation);
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frame.scale(CELL_SIZE as f32);
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let cells = Path::new(|p| {
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for i in first_row..=(first_row + visible_rows) {
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for j in
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first_column..=(first_column + visible_columns)
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{
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if self.alive_cells.contains(&(i, j)) {
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p.rectangle(
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Point::new(j as f32, i as f32),
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cell_size,
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);
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}
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}
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}
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});
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frame.fill(&cells, Color::WHITE);
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});
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});
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let hovered_cell = {
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let mut frame = Frame::new(bounds.size());
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frame.translate(self.translation);
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frame.scale(CELL_SIZE as f32);
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if let Some(cursor_position) = cursor.position_in(&bounds) {
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if let Some((i, j)) =
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self.cell_at(cursor_position - self.translation)
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{
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let interaction = Path::rectangle(
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Point::new(j as f32, i as f32),
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cell_size,
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);
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frame.fill(
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&interaction,
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Color {
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a: 0.5,
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..Color::BLACK
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},
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);
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}
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}
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frame.into_geometry()
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};
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vec![life, hovered_cell]
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}
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fn mouse_cursor(
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&self,
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bounds: Rectangle,
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cursor: Cursor,
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) -> MouseCursor {
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match self.interaction {
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Some(Interaction::Drawing) => MouseCursor::Crosshair,
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Some(Interaction::Panning { .. }) => MouseCursor::Grabbing,
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None if cursor.is_over(&bounds) => MouseCursor::Crosshair,
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_ => MouseCursor::default(),
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}
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}
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}
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}
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