make selection box sub-tile aware

src/lib/sim/EntityHitTest.h

@@ -3,6 +3,7 @@
 #include <vector>
 
 #include <QPoint>
+#include <QRectF>
 #include <QVector2D>
 
 #include "entt/entity/entity.hpp"
@@ -16,13 +17,13 @@ entt::entity entityAtWorldPos(EntityAdmin& admin, QVector2D worldPos);
 // after actors: entityAtWorldPos never returns debris (debris has no HealthComponent).
 entt::entity debrisAtWorldPos(EntityAdmin& admin, QVector2D worldPos);
 
-// Returns every piece of debris whose position falls within the inclusive tile rectangle
-// spanned by tileA and tileB, in any corner order (REQ-UI-DEBRIS-MULTI-SELECT).
-std::vector<entt::entity> debrisInBox(EntityAdmin& admin, QPoint tileA, QPoint tileB);
+// Returns every piece of debris the selection box covers — that is, whose position it
+// contains, per boxCoversPoint (REQ-UI-DEBRIS-MULTI-SELECT). `worldBox` is in world
+// coordinates and normalized; it is not snapped to tiles.
+std::vector<entt::entity> debrisInBox(EntityAdmin& admin, const QRectF& worldBox);
 
-// Returns every living actor (ship or defence station, player or enemy) that falls
-// within the inclusive tile rectangle spanned by tileA and tileB, in any corner order
-// (REQ-UI-MULTI-SELECT, REQ-UI-ENTITY-CLICK-SELECT). A ship is included when its floored
-// position tile lies in the box; a station is included when any of its body cells does.
-// Dead actors (hp <= 0) and the HQ proxy are excluded.
-std::vector<entt::entity> actorsInBox(EntityAdmin& admin, QPoint tileA, QPoint tileB);
+// Returns every living actor (ship or defence station, player or enemy) the selection
+// box covers (REQ-UI-MULTI-SELECT, REQ-UI-ENTITY-CLICK-SELECT): a ship when the box
+// contains its position, a station when the box overlaps any of its body cells — the
+// two rules of SelectionBox.h. Dead actors (hp <= 0) and the HQ proxy are excluded.
+std::vector<entt::entity> actorsInBox(EntityAdmin& admin, const QRectF& worldBox);