From 35774c0f0b1b1bb88fb7fa670c75e087f002f888 Mon Sep 17 00:00:00 2001
From: Lukas | AstroGD <lukas@astrogd.eu>
Date: Mon, 10 Jun 2024 18:02:39 +0200
Subject: [PATCH] Add coordinate-value-reverse function

---
 src/util.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/util.ts b/src/util.ts
index 682e43f..af318b3 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -8,4 +8,14 @@ export function v(x: number, y: number, w: number): number {
   return x + 9 * (y - 1) + 81 * (w - 1);
 }
 
+export function getXYW(v: number): { x: number; y: number; w: number } {
+  assert(1 <= v && v <= 729);
+
+  const w = Math.floor((v - 1) / 81) + 1;
+  const y = (Math.floor((v - 1) / 9) % 9) + 1;
+  const x = ((v - 1) % 9) + 1;
+
+  return { x, y, w };
+}
+
 export type N = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9;