defaut constructor generate a blank grid

src/lib.rs

@@ -112,6 +112,24 @@ impl Universe {
 
         let mut cells = FixedBitSet::with_capacity(size);
 
+        for i in 0..size {
+            cells.set(i, false);
+        }
+
+        Universe {
+            width,
+            height,
+            cells,
+        }
+    }
+
+    pub fn new_modulo() -> Universe {
+        let width = 64;
+        let height = 64;
+        let size = (width * height) as usize;
+
+        let mut cells = FixedBitSet::with_capacity(size);
+
         for i in 0..size {
             cells.set(i, i % 2 == 0 || i % 7 == 0);
         }
@@ -142,28 +160,17 @@ impl Universe {
     }
 
     pub fn new_space_ship() -> Universe {
-        let width : u32 = 64;
-        let height : u32 = 64;
-        let size = (width * height) as usize;
-
-        let mut cells = FixedBitSet::with_capacity(size);
-
-        for i in 0..size {
-            cells.set(i, false);
-        }
-
-        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.set(i, true);
-        }
-
-        Universe {
-            width,
-            height,
-            cells,
-        }
+        let mut univese = Universe::new();
+        const X0: u32 = 32;
+        const Y0: u32 = 32;
+        let cells = &(
+            [(0, 2), (1, 0), (1, 2), (2, 1), (2, 2)]
+            .iter()
+            .map(|(x, y)| (X0+x, Y0+y))
+            .collect::<Vec<(u32, u32)>>()
+        );
+        univese.set_cells(cells);
+        univese
     }
 
     pub fn render(&self) -> String {

www

@@ -1 +1 @@
-Subproject commit f6fa2759a6dce5379554d7294f00487bb1565004
+Subproject commit 38933c4a49773b2c7acd9bdd9d398da278186ac3