From dc6f9b65854e0d1560cabfcae5352fd7fee3ae8a Mon Sep 17 00:00:00 2001
From: Robin Eklind <rnd0x00@gmail.com>
Date: Mon, 13 Jul 2020 00:33:53 +0200
Subject: [PATCH] missiles: add BUGFIX comment for GetDirection16

---
 Source/missiles.cpp | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/Source/missiles.cpp b/Source/missiles.cpp
index d7bc2f976..42f87e3cb 100644
--- a/Source/missiles.cpp
+++ b/Source/missiles.cpp
@@ -311,9 +311,9 @@ int GetDirection16(int x1, int y1, int x2, int y2)
 		{ 4, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 		{ 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
 		{ 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0 },
-		{ 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
+		{ 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // BUGFIX: should be `{ 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },`
 		{ 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
-		{ 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1 },
+		{ 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1 }, // BUGFIX: should be `{ 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1 },`
 		{ 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1 },
 		{ 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1 },
 		{ 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1 },
@@ -324,6 +324,26 @@ int GetDirection16(int x1, int y1, int x2, int y2)
 		{ 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2 },
 		{ 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2 }
 	};
+	// The correct quadrant of direction indices is presented below:
+	/*
+		{ 99, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+		{ 4, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+		{ 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
+		{ 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0 },
+		{ 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
+		{ 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
+		{ 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1 },
+		{ 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1 },
+		{ 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1 },
+		{ 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1 },
+		{ 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1 },
+		{ 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1 },
+		{ 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2 },
+		{ 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2 },
+		{ 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2 },
+		{ 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2 }
+	*/
+
 	BYTE urtoll[5] = { 6, 7, 8, 9, 10 };
 	BYTE ultolr[5] = { 6, 5, 4, 3, 2 };
 	BYTE lltour[5] = { 14, 13, 12, 11, 10 };