From ebb926e7b052572decb40d259062a3c08ddbf8df Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Sat, 9 Dec 2017 17:38:34 +0200
Subject: [PATCH] Added free space margin aka safe frame for automap

am_freespacemargin CVAR and corresponding menu options can set empty space margin for automap in percentage of zoomed out size
https://forum.zdoom.org/viewtopic.php?t=58653
---
 src/am_map.cpp             | 19 +++++++++++++++++--
 wadsrc/static/language.enu |  1 +
 wadsrc/static/menudef.txt  |  1 +
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/am_map.cpp b/src/am_map.cpp
index d5c6a05f0..5ab41cd09 100644
--- a/src/am_map.cpp
+++ b/src/am_map.cpp
@@ -98,6 +98,20 @@ CVAR (Bool,  am_showkeys,			true,		CVAR_ARCHIVE);
 CVAR (Int,   am_showtriggerlines,	0,			CVAR_ARCHIVE);
 CVAR (Int,   am_showthingsprites,		0,		CVAR_ARCHIVE);
 
+CUSTOM_CVAR (Int, am_emptyspacemargin, 0, CVAR_ARCHIVE)
+{
+	if (self < 0)
+	{
+		self = 0;
+	}
+	else if (self > 50)
+	{
+		self = 50;
+	}
+
+	AM_NewResolution();
+}
+
 //=============================================================================
 //
 // Automap colors
@@ -1063,8 +1077,9 @@ static void AM_findMinMaxBoundaries ()
 
 static void AM_calcMinMaxMtoF()
 {
-	double a = SCREENWIDTH / max_w;
-	double b = StatusBar->GetTopOfStatusbar() / max_h;
+	const double safe_frame = 1.0 - am_emptyspacemargin / 100.0;
+	double a = safe_frame * (SCREENWIDTH / max_w);
+	double b = safe_frame * (StatusBar->GetTopOfStatusbar() / max_h);
 
 	min_scale_mtof = a < b ? a : b;
 	max_scale_mtof = SCREENHEIGHT / (2*PLAYERRADIUS);
diff --git a/wadsrc/static/language.enu b/wadsrc/static/language.enu
index c66c97612..a147eeb80 100644
--- a/wadsrc/static/language.enu
+++ b/wadsrc/static/language.enu
@@ -1941,6 +1941,7 @@ AUTOMAPMNU_SHOWKEYS				= "Show keys (cheat)";
 AUTOMAPMNU_SHOWTRIGGERLINES		= "Show trigger lines";
 AUTOMAPMNU_SHOWTHINGSPRITES		= "Show things as sprites";
 AUTOMAPMNU_PTOVERLAY			= "Overlay portals";
+AUTOMAPMNU_EMPTYSPACEMARGIN		= "Empty space margin";
 
 // Automap Controls
 MAPCNTRLMNU_TITLE 			= "CUSTOMIZE MAP CONTROLS";
diff --git a/wadsrc/static/menudef.txt b/wadsrc/static/menudef.txt
index 9e45f4137..9574608f3 100644
--- a/wadsrc/static/menudef.txt
+++ b/wadsrc/static/menudef.txt
@@ -1091,6 +1091,7 @@ OptionMenu AutomapOptions protected
 	Option "$AUTOMAPMNU_TEXTURED",				"am_textured", "OnOff"
 	Option "$AUTOMAPMNU_FOLLOW",				"am_followplayer", "OnOff"
 	Option "$AUTOMAPMNU_PTOVERLAY",				"am_portaloverlay", "OnOff"
+	Slider "$AUTOMAPMNU_EMPTYSPACEMARGIN",		"am_emptyspacemargin", 0, 50, 5, 0
 	StaticText " "
 	Option "$AUTOMAPMNU_SHOWITEMS",				"am_showitems", "OnOff"
 	Option "$AUTOMAPMNU_SHOWMONSTERS",			"am_showmonsters", "OnOff"