some getters and setters

src/lib.rs

@@ -52,6 +52,25 @@ impl Universe{
         }
         count
     }
+
+    fn regenerate_cells(&mut self) {
+        let size = (self.width * self.height) as usize;
+        self.cells = FixedBitSet::with_capacity(size);
+        for i in 0..size {
+            self.cells.set(i, false);
+        }
+    }
+
+    pub fn get_cells(&self) -> &FixedBitSet {
+        &self.cells
+    }
+
+    pub fn set_cells(&mut self, cells: &[(u32, u32)]) {
+        for (row, col) in cells.iter().cloned() {
+            let i = self.get_index(row, col);
+            self.cells.set(i, true);
+        }
+    }
 }
 
 #[wasm_bindgen]
@@ -76,6 +95,16 @@ impl Universe {
         self.cells = next;
     }
 
+    pub fn set_width(&mut self, width: u32) {
+        self.width = width;
+        self.regenerate_cells();
+    }
+
+    pub fn set_height(&mut self, height: u32) {
+        self.height = height;
+        self.regenerate_cells();
+    }
+
     pub fn new() -> Universe {
         let width = 64;
         let height = 64;