space ship

Cargo.toml

@@ -11,6 +11,7 @@ crate-type = ["cdylib", "rlib"]
 default = ["console_error_panic_hook"]
 
 [dependencies]
+js-sys = "0.3"
 wasm-bindgen = "0.2.63"
 
 # The `console_error_panic_hook` crate provides better debugging of panics by

src/lib.rs

@@ -3,6 +3,8 @@ mod utils;
 use std::fmt;
 use wasm_bindgen::prelude::*;
 
+extern crate js_sys;
+
 // When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
 // allocator.
 #[cfg(feature = "wee_alloc")]
@@ -101,6 +103,49 @@ impl Universe {
         }
     }
 
+    pub fn new_random() -> Universe {
+        let width = 64;
+        let height = 64;
+
+        let cells = (0..width * height)
+            .map(|_i| {
+                if js_sys::Math::random() < 0.5 {
+                    Cell::Alive
+                } else {
+                    Cell::Dead
+                }
+            })
+            .collect();
+
+        Universe {
+            width,
+            height,
+            cells,
+        }
+    }
+
+    pub fn new_space_ship() -> Universe {
+        let width : u32 = 64;
+        let height : u32 = 64;
+
+        let mut cells : Vec<Cell> = (0..width * height)
+            .map(|_i| { Cell::Dead })
+            .collect();
+
+        let x0 = 32;
+        let y0 = 32;
+        for (x, y) in [(0, 2), (1, 0), (1, 2), (2, 1), (2, 2)].iter().cloned() {
+            let i = ((y0 + y) * width + x0 + x) as usize;
+            cells[i] = Cell::Alive;
+        }
+
+        Universe {
+            width,
+            height,
+            cells,
+        }
+    }
+
     pub fn render(&self) -> String {
         self.to_string()
     }

www

@@ -1 +1 @@
-Subproject commit 645cf7d32c691bf9c156d34c5b18c0ea5f85e767
+Subproject commit b0799ea316d590cd432fee5f53914287e2a328d6