Improve drawing with segments

src/index.ts

@@ -2,7 +2,10 @@ import './index.scss';
 import Renderer from './renderer';
 import './utils/mulberry32';
 
-const canvas = document.querySelector('canvas') as HTMLCanvasElement;
-canvas.width = canvas.height = 640;
-const renderer = new Renderer(canvas);
-renderer.start();
+const main = () => {
+  const canvas = document.querySelector('canvas');
+  const renderer = new Renderer(canvas);
+  renderer.start();
+};
+
+main();