From 9f1d3f9c27ae3dc717ec781e14fd44626f223641 Mon Sep 17 00:00:00 2001
From: Bardur Arantsson <bardur@scientician.net>
Date: Sat, 7 Mar 2015 16:55:42 +0100
Subject: Move GRID, GRID_{X,Y} macros to spells1.cc

---
 src/spells1.cc | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/spells1.cc')

diff --git a/src/spells1.cc b/src/spells1.cc
index 180fdd75..a619c002 100644
--- a/src/spells1.cc
+++ b/src/spells1.cc
@@ -50,6 +50,23 @@ using std::chrono::milliseconds;
 /* Maximum number of tries for teleporting */
 #define MAX_TRIES 100
 
+/*
+ * Convert a "location" (Y,X) into a "grid" (G)
+ */
+#define GRID(Y,X) \
+	(256 * (Y) + (X))
+
+/*
+ * Convert a "grid" (G) into a "location" (Y)
+ */
+#define GRID_Y(G) \
+	((int)((G) / 256U))
+
+/*
+ * Convert a "grid" (G) into a "location" (X)
+ */
+#define GRID_X(G) \
+	((int)((G) % 256U))
 
 /*
  * Helper function -- return a "nearby" race for polymorphing
-- 
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