From 09c65f2822b99e43ccbc20a84998b1cc3e26eae8 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Tue, 28 Feb 2023 01:17:48 +0100
Subject: Added tracking to damage calculations

---
 universe/include/kurator/universe/TurretType.h |  6 +++++-
 universe/resources/universe/turret_types.json  | 18 ++++++++++++------
 universe/src/JsonRepository.cpp                |  3 +++
 universe/src/TurretType.cpp                    | 14 ++++++++++++--
 4 files changed, 32 insertions(+), 9 deletions(-)

(limited to 'universe')

diff --git a/universe/include/kurator/universe/TurretType.h b/universe/include/kurator/universe/TurretType.h
index c00c2ea..7b3ebdc 100644
--- a/universe/include/kurator/universe/TurretType.h
+++ b/universe/include/kurator/universe/TurretType.h
@@ -19,8 +19,12 @@ struct TurretType
 	double optimal_range = 0.0;
 	double falloff_modifier = 0.05;
 	double falloff_intensity = 0.2;
-	double effective_damage(double distance) const;
+	double tracking = 1000;
+	double tracking_factor = 3.0;
+	double tracking_exponent = 0.5;
+	double effective_damage(double distance, double speed) const;
 	double range_modifier(double distance) const;
+	double tracking_modifier(double distance, double speed) const;
 	double effective_range() const;
 	double damage_per_second() const;
 };
diff --git a/universe/resources/universe/turret_types.json b/universe/resources/universe/turret_types.json
index 0b4e3ca..0004ef1 100644
--- a/universe/resources/universe/turret_types.json
+++ b/universe/resources/universe/turret_types.json
@@ -6,7 +6,8 @@
 		"rate_of_fire": 4.5,
 		"reload": 0.0,
 		"optimal_range": 7000.0,
-		"falloff_modifier": 0.05
+		"falloff_modifier": 0.05,
+		"tracking": 150.0
 	},
 	{
 		"name": "BurstLaser",
@@ -15,7 +16,8 @@
 		"rate_of_fire": 0.25,
 		"reload": 2.75,
 		"optimal_range": 3500.0,
-		"falloff_modifier": 0.05
+		"falloff_modifier": 0.05,
+		"tracking": 260.0
 	},
 	{
 		"name": "GaussCannon",
@@ -24,7 +26,8 @@
 		"rate_of_fire": 0.0,
 		"reload": 5.5,
 		"optimal_range": 12000.0,
-		"falloff_modifier": 0.2
+		"falloff_modifier": 0.2,
+		"tracking": 35.0
 	},
 	{
 		"name": "Autocannon",
@@ -33,7 +36,8 @@
 		"rate_of_fire": 0.15,
 		"reload": 1.5,
 		"optimal_range": 2000,
-		"falloff_modifier": 0.8
+		"falloff_modifier": 0.8,
+		"tracking": 350.0
 	},
 	{
 		"name": "Howitzer",
@@ -42,7 +46,8 @@
 		"rate_of_fire": 7.5,
 		"reload": 0,
 		"optimal_range": 5600,
-		"falloff_modifier": 0.5
+		"falloff_modifier": 0.5,
+		"tracking": 60.0
 	},
 	{
 		"name": "Blaster",
@@ -51,6 +56,7 @@
 		"rate_of_fire": 0,
 		"reload": 2,
 		"optimal_range": 750,
-		"falloff_modifier": 0.45
+		"falloff_modifier": 0.45,
+		"tracking": 450.0
 	}
 ]
diff --git a/universe/src/JsonRepository.cpp b/universe/src/JsonRepository.cpp
index 5d15646..dbfb8ea 100644
--- a/universe/src/JsonRepository.cpp
+++ b/universe/src/JsonRepository.cpp
@@ -56,6 +56,9 @@ from_json(const json& item, TurretType& turret)
 	maybe_to(item, "optimal_range", turret.optimal_range);
 	maybe_to(item, "falloff_modifier", turret.falloff_modifier);
 	maybe_to(item, "falloff_intensity", turret.falloff_intensity);
+	maybe_to(item, "tracking", turret.tracking);
+	maybe_to(item, "tracking_factor", turret.tracking_factor);
+	maybe_to(item, "tracking_exponent", turret.tracking_exponent);
 }
 
 
diff --git a/universe/src/TurretType.cpp b/universe/src/TurretType.cpp
index b64efd4..4da47ef 100644
--- a/universe/src/TurretType.cpp
+++ b/universe/src/TurretType.cpp
@@ -11,9 +11,9 @@ namespace universe
 
 
 double
-TurretType::effective_damage(const double distance) const
+TurretType::effective_damage(const double distance, const double speed) const
 {
-	return base_damage * std::round(range_modifier(distance) * 1000) / 1000;
+	return base_damage * std::round(range_modifier(distance) * tracking_modifier(distance, speed) * 1000) / 1000;
 }
 
 
@@ -27,6 +27,16 @@ TurretType::range_modifier(const double distance) const
 
 
 double
+TurretType::tracking_modifier(const double distance, const double speed) const
+{
+	const auto simplified_falloff = optimal_range + optimal_range * falloff_modifier;
+	const auto by_distance = (distance + 1.0) / simplified_falloff;
+	const auto by_speed = tracking / (speed + 1.0);
+	return std::min(1.0, std::pow(tracking_factor * by_distance * by_speed, tracking_exponent));
+}
+
+
+double
 TurretType::effective_range() const
 {
 	const double one_point = 1.0 / base_damage;
-- 
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