diff --git a/index.html b/index.html index 3b66e61..35c065a 100644 --- a/index.html +++ b/index.html @@ -18,7 +18,7 @@ - 

+    
     
   
 
diff --git a/index.js b/index.js
index 41cc429..928c78c 100644
--- a/index.js
+++ b/index.js
@@ -1,12 +1,76 @@
-import { Universe } from "wasm-game-of-life";
+import { Universe, Cell } from "wasm-game-of-life";
+// Import wasm memory
+import { memory } from "wasm-game-of-life/wasm_game_of_life_bg";
+
+const CELL_SIZE = 5;
+const GRID_COLOR = "#CCCCCC";
+const DEAD_COLOR = "#FFFFFF";
+const ALIVE_COLOR = "#000000";
 
-const pre = document.getElementById("game-of-life-canvas");
 const universe = Universe.new();
+const width = universe.width();
+const height = universe.height();
+
+const canvas = document.getElementById("game-of-life-canvas");
+canvas.height = (CELL_SIZE + 1) * height + 1;
+canvas.width = (CELL_SIZE + 1) * width + 1;
+
+const ctx = canvas.getContext('2d');
 
 const renderLoop = () => {
-  pre.textContent = universe.render();
+  drawGrid();
+  drawCells();
+
   universe.tick();
+
   requestAnimationFrame(renderLoop);
 };
 
+const drawGrid = () => {
+  ctx.beginPath();
+  ctx.strokeStyle = GRID_COLOR;
+
+  for (let i = 0; i <= width; i++) {
+    ctx.moveTo(i * (CELL_SIZE + 1) + 1, 0);
+    ctx.lineTo(i * (CELL_SIZE + 1) + 1, (CELL_SIZE + 1) * height + 1);
+  }
+
+  for (let j = 0; j <= height; j++) {
+    ctx.moveTo(0,                           j * (CELL_SIZE + 1) + 1);
+    ctx.lineTo((CELL_SIZE + 1) * width + 1, j * (CELL_SIZE + 1) + 1);
+  }
+
+  ctx.stroke();
+}
+
+const getIndex = (row, column) => {
+  return row * width + column;
+}
+
+const drawCells = () => {
+  const cellsPtr = universe.cells();
+  const cells = new Uint8Array(memory.buffer, cellsPtr, width * height);
+
+  ctx.beginPath();
+
+  for (let row = 0; row < height; row++) {
+    for (let col = 0; col < width; col++) {
+      const i = getIndex(row, col);
+
+      ctx.fillStyle = cells[i] === Cell.Dead
+        ? DEAD_COLOR
+        : ALIVE_COLOR;
+
+      ctx.fillRect(
+        col * (CELL_SIZE + 1) + 1,
+        row * (CELL_SIZE + 1) + 1,
+        CELL_SIZE,
+        CELL_SIZE
+      );
+    }
+  }
+
+  ctx.stroke();
+}
+
 requestAnimationFrame(renderLoop);