some improve game ui and bugfixes

towers.h

@@ -5,21 +5,26 @@
 
 class Towers : public QObject
 {
-Q_OBJECT
+    Q_OBJECT
 public:
     explicit Towers(Game_Data * gd, QObject *parent = 0);
     bool addTower(int playerId, int srcId, QPoint pos);
     void delTower(QPoint pos);
     bool morphTower(QPoint id, int index);
     bool canBuild(int id, int player) {return gameData->players[player]->money >= gameData->players[player]->srcTowers[id].cost;}
-    bool canMorph(QPoint id, int index) {return gameData->players[gameData->curTowers[id].PlayerId]->money >= gameData->curTowers[id].src->morphs[index].cost &&
-                                                gameData->curTowers[id].experience >= gameData->curTowers[id].src->morphs[index].expRequired;}
+    bool canMorph(QPoint id, int index)
+    {
+        TowerType * t = &(gameData->curTowers[id]);
+        return gameData->players[t->PlayerId]->money >= t->src->morphs[index].cost &&
+                t->experience >= t->src->morphs[index].expRequired &&
+                !t->isBilding;
+    }
     void update();
     void setScene(QGraphicsScene * scene_) {scene = scene_;}
 
 signals:
     void shot(const TowerType &tow);
-//    void tower_killed(QPoint id);
+    //    void tower_killed(QPoint id);
 
 public slots: