Refactor codebase

src/core/math.ts

@@ -0,0 +1,17 @@
+import type { Vec2 } from "./types";
+
+export function seededRandom(seed: number): () => number {
+  let state = seed;
+  return () => {
+    state = (state * 1103515245 + 12345) & 0x7fffffff;
+    return state / 0x7fffffff;
+  };
+}
+
+export function manhattan(a: Vec2, b: Vec2): number {
+  return Math.abs(a.x - b.x) + Math.abs(a.y - b.y);
+}
+
+export function lerp(a: number, b: number, t: number): number {
+  return a + (b - a) * t;
+}