feat(entities): derivar collision_radius del shape + scale/collision_factor al YAML

source/game/entities/ship.cpp

@@ -26,18 +26,22 @@ Ship::Ship(Rendering::Renderer* renderer, PlayerConfig config, const char* shape
       config_(std::move(config)) {
     brightness_ = Defaults::Brightness::NAU;
 
-    body_.setMass(config_.physics.mass);
-    body_.radius = config_.physics.collision_radius;
-    body_.restitution = config_.physics.restitution;
-    body_.linear_damping = config_.physics.linear_damping;
-    body_.angular_damping = config_.physics.angular_damping;
-
     // El shape pot venir del YAML o ser overridden (ex: P2 amb "ship2.shp").
     const std::string SHAPE_PATH = (shape_override != nullptr) ? shape_override : config_.shape.path;
     shape_ = Graphics::ShapeLoader::load(SHAPE_PATH);
     if (!shape_ || !shape_->isValid()) {
         std::cerr << "[Ship] Error: no se ha podido cargar " << SHAPE_PATH << '\n';
     }
+
+    // Radi de col·lisió derivat del cercle circumscrit de la shape * scale * collision_factor.
+    const float BOUNDING = (shape_ != nullptr) ? shape_->getBoundingRadius() : 0.0F;
+    collision_radius_ = BOUNDING * config_.shape.scale * config_.shape.collision_factor;
+
+    body_.setMass(config_.physics.mass);
+    body_.radius = collision_radius_;
+    body_.restitution = config_.physics.restitution;
+    body_.linear_damping = config_.physics.linear_damping;
+    body_.angular_damping = config_.physics.angular_damping;
 }
 
 void Ship::init(const Vec2* spawn_point, bool activar_invulnerabilitat) {
@@ -144,10 +148,11 @@ void Ship::draw() const {
         return;
     }
 
-    // Efecto visual de empuje: escala proporcional a la velocidad.
+    // Efecte visual d'empenta (modulador sobre l'escala base del YAML).
     const float SPEED = getSpeed();
     const float VISUAL_PUSH = SPEED / config_.visual_thrust.push_divisor;
-    const float SCALE = 1.0F + (VISUAL_PUSH / config_.visual_thrust.scale_divisor);
+    const float THRUST_MODULATOR = 1.0F + (VISUAL_PUSH / config_.visual_thrust.scale_divisor);
+    const float SCALE = config_.shape.scale * THRUST_MODULATOR;
 
     // Parpelleig daurat mentre està ferida: alterna color normal ↔ color hurt.
     SDL_Color color = config_.colors.normal;