fiirst

js/vector.js

@@ -0,0 +1,24 @@
+(function () {
+  'use strict';
+
+  const root = window.PixelIslandModules ||= {};
+
+  root.Vec2 = {
+    add(a, b) {
+      return { x: a.x + b.x, y: a.y + b.y };
+    },
+    sub(a, b) {
+      return { x: a.x - b.x, y: a.y - b.y };
+    },
+    scale(v, amount) {
+      return { x: v.x * amount, y: v.y * amount };
+    },
+    length(v) {
+      return Math.hypot(v.x, v.y);
+    },
+    normalize(v) {
+      const length = Math.hypot(v.x, v.y) || 1;
+      return { x: v.x / length, y: v.y / length };
+    }
+  };
+})();