commit 503989109661dd5318aa7824f1eee6bf0df5a3ab
Author: tilman <tilmanhoffbauer@gmail.com>
Date:   Wed Sep 11 17:15:46 2019 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e4b63ef
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
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+**/*.rs.bk
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..81363b4
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "wolframs-universe"
+version = "0.1.0"
+
+[[bin]]
+name = "wolframs-universe"
+
+[dependencies]
+piston = "0.37.0"
+piston2d-graphics = "0.26.0"
+pistoncore-glutin_window = "0.47.0"
+piston2d-opengl_graphics = "0.53.0"
+
+rand = "0.5.5"
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..28a7307
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,262 @@
+extern crate piston;
+extern crate graphics;
+extern crate glutin_window;
+extern crate opengl_graphics;
+extern crate rand;
+
+use piston::window::WindowSettings;
+use piston::event_loop::*;
+use piston::input::*;
+use glutin_window::GlutinWindow as Window;
+use opengl_graphics::{ GlGraphics, OpenGL };
+use rand::Rng;
+
+pub struct App<T: Game> {
+    gl: GlGraphics, // OpenGL drawing backend.
+    field: Field,
+    game: T,
+    tile_size: i32,
+    shift_float: f64
+}
+
+type Color = [f32; 4];
+
+pub struct Field {
+    default_color: Color,
+    field: Vec<Vec<Color>>,
+    width: usize,
+    height: usize,
+    shift: usize
+}
+
+pub trait Game {
+    fn init(&mut self, field: &mut Field);
+    fn step(&mut self, field: &mut Field);
+}
+
+impl Field {
+    fn new(width: usize, height: usize) -> Field {
+        let default_color: Color = [0.0, 0.0, 0.0, 0.0];
+        let mut data = Vec::with_capacity(width);
+        for _ in 0..width {
+            let mut row = Vec::with_capacity(height);
+            for _ in 0..height {
+                row.push(default_color)
+            }
+            data.push(row);
+        }
+        Field {
+            default_color,
+            field: data,
+            width,
+            height,
+            shift: 0
+        }
+    }
+
+    fn assert_range(&self, x: usize, y: usize) {
+        assert!(x < self.width, "X is not in range!");
+        assert!(y < self.height, "Y is not in range!");
+    }
+
+    fn shift(&mut self) {
+        let height = self.height;
+        let default_color = self.default_color;
+        let mut new_shift = (self.shift as isize + 1) % height as isize;
+        if new_shift < 0 {
+            new_shift = height as isize + new_shift;
+        }
+        self.shift = new_shift as usize;
+        for x in 0..self.width {
+            self.set_data(x as i64, height - 1, default_color);
+        }
+    }
+
+    fn get_shifted(&self, y: usize) -> usize {
+        (y + self.shift) % self.height
+    }
+
+    fn get_cylindric(&self, x: i64) -> usize {
+        //match x {
+        //    0 ... (self.width - 1) => x,
+        //    (-self.width) ... (-1) => self.width - x,
+        //    _ => panic!("Value for x out of bounds!")
+        //}
+        if x >= 0 && x < self.width as i64 {
+            x as usize
+        } else if x < 0 && x >= -(self.width as i64) {
+            (self.width as i64 + x) as usize
+        } else {
+            panic!("Value of x ({}) out of range!", x)
+        }
+    }
+
+    fn set_data(&mut self, x: i64, y: usize, data: Color) {
+        let y_shifted = self.get_shifted(y);
+        let x_cylindric = self.get_cylindric(x);
+        self.assert_range(x_cylindric, y_shifted);
+        self.field[x_cylindric][y_shifted] = data
+    }
+
+    fn get_data(&self, x: i64, y: usize) -> Color {
+        let y_shifted = self.get_shifted(y);
+        let x_cylindric = self.get_cylindric(x);
+        self.assert_range(x_cylindric, y_shifted);
+        self.field[x_cylindric][y_shifted]
+    }
+}
+
+impl<T: Game> App<T> {
+    fn render(&mut self, args: &RenderArgs) {
+        use graphics::*;
+
+        let square = rectangle::square(0.0, 0.0, self.tile_size as f64);
+        let tile_size = self.tile_size;
+        let field = &self.field;
+
+        self.gl.draw(args.viewport(), |c, gl| {
+            // Clear the screen.
+            clear([0.0, 0.0, 0.0, 1.0], gl);
+
+            for y in 0..field.height {
+                for x in 0..field.width {
+
+                    let transform = c.transform
+                        .trans(x as f64 * tile_size as f64, y as f64 * tile_size as f64);
+
+                    rectangle(field.get_data(x as i64, y), square, transform, gl);
+
+                }
+            }
+        });
+    }
+
+    fn update(&mut self, args: &UpdateArgs) {
+        self.shift_float += args.dt * 4.0;
+        if self.shift_float >= 1.0 {
+            let shift = self.shift_float as usize;
+            for i in 0..shift {
+                self.game.step(&mut self.field);
+            }
+            self.shift_float = self.shift_float % 1.0;
+        }
+    }
+}
+
+pub struct WolframsUniverse {
+    init_prob: f64,
+    alive_rules: [u8; 2],
+    last_row: usize
+}
+
+impl WolframsUniverse {
+    fn new() -> WolframsUniverse {
+        WolframsUniverse {
+            init_prob: 0.5,
+            alive_rules: [2, 4],
+            last_row: 0
+        }
+    }
+}
+
+impl Game for WolframsUniverse {
+    fn init(&mut self, field: &mut Field) {
+        for x in 0..field.width {
+            if rand::thread_rng().gen_bool(0.5) {
+                field.set_data(x as i64, 0, [1.0, 1.0, 1.0, 1.0]);
+            }
+        }
+    }
+
+    fn step(&mut self, field: &mut Field) {
+        if self.last_row == field.height - 1 {
+            field.shift();
+        } else {
+            self.last_row += 1;
+        }
+        /*for x in 0..field.width as i64 {
+
+            let mut count: u8 = 0;
+            for parent_x in (x as i64 - 2)..(x as i64 + 2 + 1) {
+                if field.get_data(parent_x % field.width as i64, self.last_row - 1) != field.default_color {
+                    count += 1;
+                }
+            }
+            for alive_rule in self.alive_rules.iter() {
+                if count == *alive_rule {
+                    field.set_data(x, self.last_row, [1.0, 1.0, 1.0, 1.0]);
+                    break;
+                }
+            }
+        }*/
+        let parent_y = self.last_row - 1;
+        let mut count = 0;
+        for parent_x in -2..3 {
+            if field.get_data(parent_x, parent_y) != field.default_color {
+                count += 1
+            }
+        }
+        for x in 0..field.width as i64 {
+            for alive_rule in self.alive_rules.iter() {
+                if count == *alive_rule {
+                    field.set_data(x, self.last_row, [1.0, 1.0, 1.0, 1.0]);
+                    break;
+                }
+            }
+            if count > 0 && field.get_data(x - 2, parent_y) != field.default_color {
+                count -= 1;
+            }
+            if field.get_data((x + 3) % field.width as i64, parent_y) != field.default_color {
+                count += 1;
+            }
+        }
+    }
+}
+
+fn main() {
+
+    // Change this to OpenGL::V2_1 if not working.
+    let opengl = OpenGL::V3_2;
+
+    let width_pixel = 1600;
+    let height_pixel = 1200;
+    let tile_size = 10;
+
+    // Create an Glutin window.
+    let mut window: Window = WindowSettings::new(
+        "Wolfram's Universe",
+        [width_pixel, height_pixel]
+    )
+        .opengl(opengl)
+        .exit_on_esc(true)
+        .build()
+        .unwrap();
+
+    // Create a new game and run it.
+    let mut app = App {
+        gl: GlGraphics::new(opengl),
+        field: Field::new((width_pixel / tile_size) as usize, (height_pixel / tile_size) as usize),
+        game: WolframsUniverse::new(),
+        tile_size: tile_size as i32,
+        shift_float: 0.0
+    };
+    app.game.init(&mut app.field);
+
+    // Debug
+    println!("{} {}", 4.7654321 % 1.0, 4.7654321 as usize);
+    //app.field.set_data(2, 0, [1.0, 1.0, 0.0, 1.0]);
+    //println!("Data at (2,0) {:?}", app.field.get_data(2, 0));
+    println!("Shift: {}", app.field.shift);
+
+    // Event handling and main thread
+    let mut events = Events::new(EventSettings::new());
+    while let Some(e) = events.next(&mut window) {
+        if let Some(r) = e.render_args() {
+            app.render(&r);
+        }
+
+        if let Some(u) = e.update_args() {
+            app.update(&u);
+        }
+    }
+}