From b4e622daa5514799385393252a7cd7d00902777f Mon Sep 17 00:00:00 2001
From: mlangkabel <malte.langkabel@gmail.com>
Date: Mon, 3 Aug 2026 21:06:06 +0200
Subject: [PATCH] extract the shared Centroid helper into ai/Centroid.h

---
 src/lib/ecs/system/CMakeLists.txt         |  1 +
 src/lib/ecs/system/ai/AdvanceExecutor.cpp | 23 +-------------------
 src/lib/ecs/system/ai/Centroid.h          | 26 +++++++++++++++++++++++
 src/lib/ecs/system/ai/StandbyExecutor.cpp | 23 +-------------------
 4 files changed, 29 insertions(+), 44 deletions(-)
 create mode 100644 src/lib/ecs/system/ai/Centroid.h

diff --git a/src/lib/ecs/system/CMakeLists.txt b/src/lib/ecs/system/CMakeLists.txt
index f127656..ed99ca3 100644
--- a/src/lib/ecs/system/CMakeLists.txt
+++ b/src/lib/ecs/system/CMakeLists.txt
@@ -5,6 +5,7 @@ SET(HDRS
     ${CMAKE_CURRENT_SOURCE_DIR}/ai/AttackEvaluator.h
     ${CMAKE_CURRENT_SOURCE_DIR}/ai/AttackExecutor.h
     ${CMAKE_CURRENT_SOURCE_DIR}/ai/BehaviorTargeting.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/ai/Centroid.h
     ${CMAKE_CURRENT_SOURCE_DIR}/ai/DeliverScrapEvaluator.h
     ${CMAKE_CURRENT_SOURCE_DIR}/ai/DeliverScrapExecutor.h
     ${CMAKE_CURRENT_SOURCE_DIR}/ai/RallyEvaluator.h
diff --git a/src/lib/ecs/system/ai/AdvanceExecutor.cpp b/src/lib/ecs/system/ai/AdvanceExecutor.cpp
index 0c6095b..32da3c0 100644
--- a/src/lib/ecs/system/ai/AdvanceExecutor.cpp
+++ b/src/lib/ecs/system/ai/AdvanceExecutor.cpp
@@ -6,6 +6,7 @@
 
 #include "AdvanceBehavior.h"
 #include "BehaviorKind.h"
+#include "Centroid.h"
 #include "EntityAdmin.h"
 #include "FactionComponent.h"
 #include "HealthComponent.h"
@@ -16,28 +17,6 @@
 #include "StationBodyComponent.h"
 #include "tracing.h"
 
-namespace
-{
-// Accumulates positions to produce their centroid (the center between them).
-struct Centroid
-{
-    QVector2D sum;
-    int       count = 0;
-
-    void add(const QVector2D& point)
-    {
-        sum += point;
-        count += 1;
-    }
-
-    std::optional<QVector2D> value() const
-    {
-        if (count == 0) { return std::nullopt; }
-        return sum / static_cast<float>(count);
-    }
-};
-}
-
 void AdvanceExecutor::execute(EntityAdmin& admin)
 {
     TRACE();
diff --git a/src/lib/ecs/system/ai/Centroid.h b/src/lib/ecs/system/ai/Centroid.h
new file mode 100644
index 0000000..3396da8
--- /dev/null
+++ b/src/lib/ecs/system/ai/Centroid.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <optional>
+
+#include <QVector2D>
+
+// Accumulates positions to produce their centroid (the center between them).
+// Shared by the behavior executors that steer toward the middle of a group of
+// entities (AdvanceExecutor: defence stations; StandbyExecutor: friendly ships).
+struct Centroid
+{
+    QVector2D sum;
+    int       count = 0;
+
+    void add(const QVector2D& point)
+    {
+        sum += point;
+        count += 1;
+    }
+
+    std::optional<QVector2D> value() const
+    {
+        if (count == 0) { return std::nullopt; }
+        return sum / static_cast<float>(count);
+    }
+};
diff --git a/src/lib/ecs/system/ai/StandbyExecutor.cpp b/src/lib/ecs/system/ai/StandbyExecutor.cpp
index e29b11d..eff674c 100644
--- a/src/lib/ecs/system/ai/StandbyExecutor.cpp
+++ b/src/lib/ecs/system/ai/StandbyExecutor.cpp
@@ -5,6 +5,7 @@
 #include <QVector2D>
 
 #include "BehaviorKind.h"
+#include "Centroid.h"
 #include "EntityAdmin.h"
 #include "FactionComponent.h"
 #include "HealthComponent.h"
@@ -16,28 +17,6 @@
 #include "StationBodyComponent.h"
 #include "tracing.h"
 
-namespace
-{
-// Accumulates positions to produce their centroid (the center between them).
-struct Centroid
-{
-    QVector2D sum;
-    int       count = 0;
-
-    void add(const QVector2D& point)
-    {
-        sum += point;
-        count += 1;
-    }
-
-    std::optional<QVector2D> value() const
-    {
-        if (count == 0) { return std::nullopt; }
-        return sum / static_cast<float>(count);
-    }
-};
-}
-
 void StandbyExecutor::execute(EntityAdmin& admin)
 {
     TRACE();