add enemy ia

common/utils.ts

@@ -224,6 +224,14 @@ export class Vec2 {
 	public clone() {
 		return new Vec2(this.x(), this.y());
 	}
+
+	public normalize() {
+		return new Vec2(clamp(this.x(), -1, 1), clamp(this.y(), -1, 1));
+	}
+}
+
+export function clamp(x: number, min: number, max: number) {
+	return Math.max(min, Math.min(x, max));
 }
 
 export function v2(x: number, y: number) {