From cb3693f6648df798c53c481b3e561ecfdbc2838e Mon Sep 17 00:00:00 2001
From: ulteq <ulteq@web.de>
Date: Wed, 16 Nov 2016 14:20:44 +0100
Subject: [PATCH] ATragMX - Fixes possible divison through zero

---
 .../fnc_recalculate_c1_ballistic_coefficient.sqf     | 12 ++++++++----
 .../functions/fnc_recalculate_muzzle_velocity.sqf    | 12 ++++++++----
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/addons/atragmx/functions/fnc_recalculate_c1_ballistic_coefficient.sqf b/addons/atragmx/functions/fnc_recalculate_c1_ballistic_coefficient.sqf
index 3ad4f26845..028a06fa4a 100644
--- a/addons/atragmx/functions/fnc_recalculate_c1_ballistic_coefficient.sqf
+++ b/addons/atragmx/functions/fnc_recalculate_c1_ballistic_coefficient.sqf
@@ -37,16 +37,20 @@ private ["_lowerIndex", "_upperIndex"];
 for "_index" from 1 to (_lookupTableSize - 1) do {
     _upperIndex = _index;
     _lowerIndex = _upperIndex - 1;
-    if (((_lookupTable select _index) select 0) >= (GVAR(targetRange) select GVAR(currentTarget))) exitWith {}
+    if (((_lookupTable select _index) select 0) >= (GVAR(targetRange) select GVAR(currentTarget))) exitWith {};
 };
 
-private ["_lowerDistance", "_upperDistance", "_lowerC1", "_upperC1", "_slope", "_c1"];
+private ["_lowerDistance", "_upperDistance", "_lowerC1", "_upperC1", "_c1"];
 _lowerDistance = (_lookupTable select _lowerIndex) select 0;
 _upperDistance = (_lookupTable select _upperIndex) select 0;
 _lowerC1       = (_lookupTable select _lowerIndex) select 1;
 _upperC1       = (_lookupTable select _upperIndex) select 1;
-_slope = (_upperC1 - _lowerC1) / (_upperDistance - _lowerDistance);
-_c1 = 0.1 max (_lowerC1 + ((GVAR(targetRange) select GVAR(currentTarget)) - _lowerDistance) * _slope) min 2.0;
+_c1 = _lowerC1;
+if (_lowerDistance != _upperDistance) then {
+    private _slope = (_upperC1 - _lowerC1) / (_upperDistance - _lowerDistance);
+    _c1 = _lowerC1 + ((GVAR(targetRange) select GVAR(currentTarget)) - _lowerDistance) * _slope;
+};
+_c1 = 0.1 max _c1 min 2.0;
 
 if (_c1 != GVAR(workingMemory) select 15) then {
     GVAR(workingMemory) set [15, _c1];
diff --git a/addons/atragmx/functions/fnc_recalculate_muzzle_velocity.sqf b/addons/atragmx/functions/fnc_recalculate_muzzle_velocity.sqf
index 430e8ecc68..5830ba7683 100644
--- a/addons/atragmx/functions/fnc_recalculate_muzzle_velocity.sqf
+++ b/addons/atragmx/functions/fnc_recalculate_muzzle_velocity.sqf
@@ -37,16 +37,20 @@ private ["_lowerIndex", "_upperIndex"];
 for "_index" from 1 to (_lookupTableSize - 1) do {
     _upperIndex = _index;
     _lowerIndex = _upperIndex - 1;
-    if (((_lookupTable select _index) select 0) >= GVAR(temperature)) exitWith {}
+    if (((_lookupTable select _index) select 0) >= GVAR(temperature)) exitWith {};
 };
 
-private ["_lowerTemperature", "_upperTemperature", "_lowerMuzzleVelocity", "_upperMuzzleVelocity", "_slope", "_muzzleVelocity"];
+private ["_lowerTemperature", "_upperTemperature", "_lowerMuzzleVelocity", "_upperMuzzleVelocity", "_muzzleVelocity"];
 _lowerTemperature    = (_lookupTable select _lowerIndex) select 0;
 _upperTemperature    = (_lookupTable select _upperIndex) select 0;
 _lowerMuzzleVelocity = (_lookupTable select _lowerIndex) select 1;
 _upperMuzzleVelocity = (_lookupTable select _upperIndex) select 1;
-_slope = (_upperMuzzleVelocity - _lowerMuzzleVelocity) / (_upperTemperature - _lowerTemperature);
-_muzzleVelocity = _lowerMuzzleVelocity + (GVAR(temperature) - _lowerTemperature) * _slope;
+_muzzleVelocity = _lowerMuzzleVelocity;
+if (_lowerTemperature != _upperTemperature) then {
+    private _slope = (_upperMuzzleVelocity - _lowerMuzzleVelocity) / (_upperTemperature - _lowerTemperature);
+    _muzzleVelocity = _lowerMuzzleVelocity + (GVAR(temperature) - _lowerTemperature) * _slope;
+};
+_muzzleVelocity = 100 max _muzzleVelocity min 1400;
 
 if (_muzzleVelocity != GVAR(workingMemory) select 1) then {
     GVAR(workingMemory) set [1, _muzzleVelocity];