Initial commit.

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Moridius 2020-06-13 02:37:38 +02:00
commit 24fa3e4586
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10
Cargo.toml Normal file
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[package]
name = "gol"
version = "0.1.0"
authors = ["Moridius <moridius-github@posteo.hu>"]
edition = "2018"
[dependencies]
png = "0.15.0"
rand = "0.6.5"
structopt = "0.3"

238
src/main.rs Normal file
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use png;
use rand::Rng;
use std::collections::HashSet;
use std::fmt;
use std::fs::File;
use std::io::prelude::*;
use std::io::{BufRead, BufReader, BufWriter};
use std::path::Path;
use std::result::Result;
use structopt::StructOpt;
/// Generates Game Of Life wallpapers.
#[derive(StructOpt, Debug)]
#[structopt(name = "gol")]
struct Opt {
/// Width of the wallpaper
#[structopt(name = "width")]
width: u32,
/// Height of the wallpaper
#[structopt(name = "height")]
height: u32,
// /// bla
// #[structopt(name = "pixelsize")]
// pixel_size: u32,
}
#[derive(Debug)]
pub enum FormatError {
ParserError,
}
impl fmt::Display for FormatError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
_ => f.write_str("Error while parsing."),
}
}
}
impl std::error::Error for FormatError {
fn description(&self) -> &str {
match *self {
_ => "Error while parsing.",
}
}
}
struct Field {
width: u32,
height: u32,
tmp_path: std::string::String,
data: HashSet<(u32, u32)>,
}
impl Field {
fn with_size(width: u32, height: u32) -> Self {
//fn with_size(width: u32, height: u32, pixel_size: u32) -> Self {
Field {
width,
height,
tmp_path: "/tmp/wallpaper.gol".to_string(),
data: HashSet::new(),
}
}
fn write_file(&self) {
let mut output = "".to_string();
for coords in &self.data {
output.push_str(&format!("{}/{}\n", coords.0, coords.1));
}
let mut file = File::create(&self.tmp_path).unwrap();
write!(file, "{}", output).unwrap();
}
fn read_file(&mut self) -> Result<(), FormatError> {
let file = File::open(&self.tmp_path);
if file.is_err() {
return Err(FormatError::ParserError);
}
let file = BufReader::new(file.unwrap());
self.data = HashSet::new();
for line in file.lines() {
if line.is_err() {
return Err(FormatError::ParserError);
}
let line = line.unwrap();
let parts: Vec<_> = line.split('/').collect();
let x = parts[0].parse();
let y = parts[1].parse();
if x.is_err() || y.is_err() {
return Err(FormatError::ParserError);
}
let x: u32 = x.unwrap();
let y: u32 = y.unwrap();
self.data.insert((x, y));
}
Ok(())
}
fn write_image(&self, path: &str) {
let path = Path::new(&path);
let file = File::create(path).unwrap();
let ref mut w = BufWriter::new(file);
let mut encoder = png::Encoder::new(w, self.width, self.height);
encoder.set_color(png::ColorType::RGB);
encoder.set_depth(png::BitDepth::Eight);
let mut writer = encoder.write_header().unwrap();
let mut pixels = Vec::<u8>::new();
for y in 0..self.height {
for x in 0..self.width {
if self.data.contains(&(x, y)) {
pixels.push(255);
pixels.push(0);
pixels.push(0);
} else {
pixels.push(0);
pixels.push(0);
pixels.push(0);
}
}
}
// println!("{:?}", pixels);
//let data = [255, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0];
writer.write_image_data(pixels.as_slice()).unwrap(); // Save
}
fn fill_random(&mut self) {
let mut rng = rand::thread_rng();
for x in 0..self.width {
for y in 0..self.height {
let r = rng.gen_range(0, 100);
if r < 15 {
self.data.insert((x, y));
}
}
}
}
fn count_neighbours(&self, x: u32, y: u32) -> u8 {
let mut neighbours = 0;
if x > 0 && y > 0 {
neighbours += self.is_alive(x - 1, y - 1);
}
if x > 0 {
neighbours += self.is_alive(x - 1, y);
neighbours += self.is_alive(x - 1, y + 1);
}
if y > 0 {
neighbours += self.is_alive(x, y - 1);
neighbours += self.is_alive(x + 1, y - 1);
}
neighbours += self.is_alive(x + 1, y);
neighbours += self.is_alive(x, y + 1);
neighbours += self.is_alive(x + 1, y + 1);
//if x == 2 && (y == 0 || y == 2) {
//println!("{}/{}: {}", x, y, neighbours);
//}
neighbours
}
fn is_alive(&self, x: u32, y: u32) -> u8 {
if self.data.contains(&(x, y)) {
return 1;
} else {
return 0;
}
}
fn step(&mut self) {
let mut new_data = HashSet::new();
for x in 0..self.width {
for y in 0..self.height {
let n = self.count_neighbours(x, y);
if self.is_alive(x, y) == 1 {
if n < 2 || n > 3 {
// die
new_data.remove(&(x, y));
} else {
// stay alive
new_data.insert((x, y));
}
} else if n == 3 {
// become alive
new_data.insert((x, y));
}
}
}
self.data = new_data;
}
/*
fn print(&self) {
print!("{}", "+");
for _ in 0..self.width {
print!("{}", "-");
}
println!("{}", "+");
for y in 0..self.height {
print!("{}", "|");
for x in 0..self.width {
if self.data.contains(&(x, y)) {
print!("{}", "O");
} else {
print!("{}", " ");
}
}
println!("{}", "|");
}
print!("{}", "+");
for _ in 0..self.width {
print!("{}", "-");
}
println!("{}", "+");
}
*/
}
fn main() {
let opt = Opt::from_args();
let mut field = Field::with_size(opt.width, opt.height); //, opt.pixel_size);
if field.read_file().is_ok() {
field.step();
} else {
field.fill_random();
}
field.write_file();
field.write_image(&"/tmp/gol.png");
}