allow multi-select for ships/stations, mixable with scrap

src/test/ScrapTest.cpp

@@ -1,5 +1,6 @@
 #include "catch.hpp"
 
+#include <QSize>
 #include <QVector2D>
 
 #include <algorithm>
@@ -226,3 +227,45 @@ TEST_CASE("scrapInBox returns exactly the piles inside the tile rectangle", "[sc
     REQUIRE(contains(hit, inB));
     REQUIRE_FALSE(contains(hit, outX));
 }
+
+TEST_CASE("actorsInBox returns living ships and stations, excluding scrap and dead actors",
+          "[actor]")
+{
+    EntityAdmin admin;
+
+    // Two living ships inside the box: one player, one enemy.
+    const entt::entity playerShip = admin.spawnShip(
+        QVector2D(1.5f, 2.5f), 100.0f, 100.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 5.0f,
+        "fighter", false);                                  // tile (1,2)
+    const entt::entity enemyShip = admin.spawnShip(
+        QVector2D(4.2f, 5.8f), 100.0f, 100.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 5.0f,
+        "raider", true);                                    // tile (4,5)
+
+    // A dead ship inside the box is excluded.
+    const entt::entity deadShip = admin.spawnShip(
+        QVector2D(3.0f, 3.0f), 0.0f, 100.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 5.0f,
+        "fighter", false);
+
+    // A ship outside the box is excluded.
+    const entt::entity outsideShip = admin.spawnShip(
+        QVector2D(20.0f, 20.0f), 100.0f, 100.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 5.0f,
+        "fighter", false);
+
+    // A station is included when any body cell lies inside the box.
+    const std::vector<QPoint> stationCells{ QPoint(2, 2), QPoint(3, 2) };
+    const entt::entity station = admin.spawnStation(
+        QPoint(2, 2), QSize(2, 1), stationCells, 200.0f, 200.0f, true);
+
+    // Scrap and the HQ proxy are never actors.
+    admin.spawnScrap(QVector2D(1.0f, 1.0f), 5, Tick(1000));
+    admin.spawnHqProxy(QVector2D(0.5f, 0.5f), 500.0f, 500.0f);
+
+    const std::vector<entt::entity> hit = actorsInBox(admin, QPoint(5, 5), QPoint(0, 0));
+
+    REQUIRE(hit.size() == 3);
+    REQUIRE(contains(hit, playerShip));
+    REQUIRE(contains(hit, enemyShip));
+    REQUIRE(contains(hit, station));
+    REQUIRE_FALSE(contains(hit, deadShip));
+    REQUIRE_FALSE(contains(hit, outsideShip));
+}