Do not compute the battle graph in case of a single kart in debug

mode in an arena: in debug mode computing the distance matrix
takes a LONG time (approximately 12 minutes on my machine). In
release mode it's fast enough for now.

src/modes/three_strikes_battle.cpp

@@ -453,10 +453,18 @@ void ThreeStrikesBattle::updateKartNodes()
     {
         if (m_karts[i]->isEliminated()) continue;
 
-        m_kart_info[i].m_on_node = BattleGraph::get()
+#ifdef DEBUG
-            ->pointToNode(m_kart_info[i].m_on_node,
+        // Battle map not loaded in debug mode with a single kart
-                          m_karts[i]->getXYZ(), false/*ignore_vertical*/);
+        // since the graph creation is very expensive.
-    }
+        if(race_manager->getNumberOfKarts()>1)
+#endif
+        {
+            m_kart_info[i].m_on_node = BattleGraph::get()
+                                     ->pointToNode(m_kart_info[i].m_on_node,
+                                                   m_karts[i]->getXYZ(),
+                                                   false/*ignore_vertical*/);
+        } 
+    }   // for i < n
 }
 
 //-----------------------------------------------------------------------------

src/states_screens/race_gui.cpp

@@ -335,6 +335,14 @@ void RaceGUI::drawGlobalTimer()
  */
 void RaceGUI::drawGlobalMiniMap()
 {
+#ifdef DEBUG
+    // Battle map not loaded in debug mode with a single kart due to slowness
+    if(race_manager->getNumberOfKarts()==1 &&
+        ( World::getWorld()->getTrack()->isArena() ||
+          World::getWorld()->getTrack()->isSoccer()   )  )
+        return;
+#endif
+
     World *world = World::getWorld();
     // draw a map when arena has a navigation mesh.
     if ((world->getTrack()->isArena() || world->getTrack()->isSoccer()) &&

src/tracks/track.cpp

@@ -671,6 +671,14 @@ void Track::startMusic() const
  */
 void Track::loadBattleGraph()
 {
+#ifdef DEBUG
+    // This must be a testing race with just one player. Do not load the
+    // battle graph since it can be VERY slow in debug mode - temple
+    // needs in the order of minutes.
+    if(race_manager->getNumberOfKarts()==1)
+        return;
+#endif
+
     BattleGraph::create(m_root+"navmesh.xml");
 
     if(BattleGraph::get()->getNumNodes()==0)
@@ -1870,8 +1878,16 @@ void Track::loadTrackModel(bool reverse_track, unsigned int mode_id)
 
     delete root;
 
-    if ((m_is_arena || m_is_soccer) && !m_is_cutscene && m_has_navmesh && !arena_random_item_created)
+#ifdef DEBUG
+    // Don't use battle graph in debug mode with a single kart (i.e. testing
+    // only). Loading can be VERY slow.
+    if(race_manager->getNumberOfKarts()>1)
+#endif
+    {
+        if ((m_is_arena || m_is_soccer) && !m_is_cutscene && m_has_navmesh &&
+            !arena_random_item_created )
         BattleGraph::get()->findItemsOnGraphNodes();
+    }
 
     if (UserConfigParams::m_track_debug &&
         race_manager->getMinorMode()!=RaceManager::MINOR_MODE_3_STRIKES &&