From 175652456b67e8dc874be025dcbf25b7a5e7e0ec Mon Sep 17 00:00:00 2001
From: Brandon Danyluk <brandondanyluk366@gmail.com>
Date: Sat, 8 May 2021 02:49:16 -0600
Subject: [PATCH] add the ability to see a light trail

---
 addons/hot/CfgAmmo.hpp                        |  2 ++
 addons/metis/CfgAmmo.hpp                      |  2 ++
 .../functions/fnc_guidancePFH.sqf             | 30 +++++++++++++++++--
 .../missileguidance/functions/fnc_onFired.sqf |  8 +++--
 4 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/addons/hot/CfgAmmo.hpp b/addons/hot/CfgAmmo.hpp
index 4a957cc551..f9debedbde 100644
--- a/addons/hot/CfgAmmo.hpp
+++ b/addons/hot/CfgAmmo.hpp
@@ -62,6 +62,8 @@ class CfgAmmo {
 
             canVanillaLock = 0;          // Can this default vanilla lock? Only applicable to non-cadet mode
 
+            showTrail = 1;
+
             // Guidance type for munitions
             defaultSeekerType = "SACLOS";
             seekerTypes[] = { "SACLOS" };
diff --git a/addons/metis/CfgAmmo.hpp b/addons/metis/CfgAmmo.hpp
index bb22e72190..1d544edc85 100644
--- a/addons/metis/CfgAmmo.hpp
+++ b/addons/metis/CfgAmmo.hpp
@@ -15,6 +15,8 @@ class CfgAmmo {
 
             canVanillaLock = 0;          // Can this default vanilla lock? Only applicable to non-cadet mode
 
+            showTrail = 1;
+
             // Guidance type for munitions
             defaultSeekerType = "SACLOS";
             seekerTypes[] = { "SACLOS" };
diff --git a/addons/missileguidance/functions/fnc_guidancePFH.sqf b/addons/missileguidance/functions/fnc_guidancePFH.sqf
index d2a31072e5..b4a67b53d6 100644
--- a/addons/missileguidance/functions/fnc_guidancePFH.sqf
+++ b/addons/missileguidance/functions/fnc_guidancePFH.sqf
@@ -15,6 +15,7 @@
  *
  * Public: No
  */
+#define TRAIL_COLOUR(multiplier) [1 * multiplier, 1 * multiplier, 0.3 * multiplier, 0.7 * multiplier]
 
 BEGIN_COUNTER(guidancePFH);
 
@@ -24,15 +25,40 @@ _firedEH params ["_shooter","","","","_ammo","","_projectile"];
 _launchParams params ["","_targetLaunchParams","","","","","_navigationType"];
 _stateParams params ["_lastRunTime", "_seekerStateParams", "_attackProfileStateParams", "_lastKnownPosState", "_navigationParameters", "_guidanceParameters"];
 _navigationStateParams params ["_currentState", "_navigationStateData"];
+_flightParams params ["_pitchRate", "_yawRate", "_isBangBangGuidance", "_stabilityCoefficient", "_showTrail"];
 
 if (!alive _projectile || isNull _projectile || isNull _shooter) exitWith {
     [_pfID] call CBA_fnc_removePerFrameHandler;
     END_COUNTER(guidancePFH);
 };
 
-private _timestep = diag_deltaTime * accTime;
+if (_showTrail) then {
+    drop [
+        "\a3\data_f\kouleSvetlo", "", "Billboard", 
+        100,
+        0.03,
+        _projectile modelToWorld [0, 0, 0],
+        [0, 0, 0],
+        0,
+        1.25,
+        1,
+        0.05,
+        [0.5],
+        [TRAIL_COLOUR(1)],
+        [0],
+        0,
+        0,
+        "",
+        "",
+        "",
+        0,
+        false,
+        -1,
+        [TRAIL_COLOUR(10000)]
+    ];
+};
 
-_flightParams params ["_pitchRate", "_yawRate", "_isBangBangGuidance", "_stabilityCoefficient"];
+private _timestep = diag_deltaTime * accTime;
 
 // Run seeker function:
 private _seekerTargetPos = [[0,0,0], _args, _seekerStateParams, _lastKnownPosState, _timestep] call FUNC(doSeekerSearch);
diff --git a/addons/missileguidance/functions/fnc_onFired.sqf b/addons/missileguidance/functions/fnc_onFired.sqf
index 8018cae9eb..c594f29a7e 100644
--- a/addons/missileguidance/functions/fnc_onFired.sqf
+++ b/addons/missileguidance/functions/fnc_onFired.sqf
@@ -113,12 +113,15 @@ private _bangBang = false;
 if (isNumber (_config >> "pitchRate")) then {
     _pitchRate = getNumber ( _config >> "pitchRate" );
     _yawRate = getNumber ( _config >> "yawRate" );
-    _bangBang = 1 == getNumber (_config >> "bangBangGuidance");
+    _bangBang = (1 == getNumber (_config >> "bangBangGuidance"));
 };
 
 // How much this projectile likes to stay toward current velocity
 private _stabilityCoefficient = getNumber (_config >> "stabilityCoefficient");
 
+// show a light trail in flight
+private _showTrail = (1 == getNumber (_config >> "showTrail"));
+
 private _navigationStateSubclass = _config >> "navigationStates";
 private _states = getArray (_navigationStateSubclass >> "states");
 
@@ -153,7 +156,8 @@ private _args = [_this,
                 _pitchRate,
                 _yawRate,
                 _bangBang,
-                _stabilityCoefficient
+                _stabilityCoefficient,
+                _showTrail
             ],
             [
                 getNumber ( _config >> "seekerAngle" ),