some improve game ui and bugfixes

ad_graphics.cpp

@@ -73,7 +73,9 @@ void AD_Graphics::mousePressEvent(QMouseEvent *event)
 //    scene->clearSelection();
     if (event->button() == Qt::LeftButton)
     {
-        if (m_building) emit add_tow((QPointF(event->pos())/cellSize).toPoint());
+        if (m_building)
+            emit add_tow((QPointF(event->pos())/cellSize).toPoint(),
+                         event->modifiers().testFlag(Qt::ShiftModifier));
         else
         {
             QList<QGraphicsItem*> list = scene->items(event->pos(), Qt::IntersectsItemBoundingRect, Qt::AscendingOrder);
@@ -126,7 +128,7 @@ void AD_Graphics::timerEvent(QTimerEvent * )
     } else selection_tow->hide();
     selection_tow->next();
     selection_al->next();
-    if (!core->isWaveEnd())
+    if (core->isWaveEnd())
         scene->update();
 }
 
@@ -185,6 +187,7 @@ void AD_Graphics::alienKilled(int id)
 {
     if (select_al != 0) if (select_al->id() == id) select_al = 0;
     QPainter p(mapimg);
+    p.setCompositionMode(QPainter::CompositionMode_Plus);
     p.translate((core->addata->aliens->curAliens[id].pos+QPointF(0.5,0.5))*cellSize);
     p.drawImage(core->addata->bloodrect, *(core->addata->blood));
     p.end();