GNS3 Grid center.patch

diff --git a/gns3/items/node_item.py b/gns3/items/node_item.py
index 128f6fc..a7a64b6 100644
--- a/gns3/items/node_item.py
+++ b/gns3/items/node_item.py
@@ -380,7 +380,9 @@ class NodeItem():
         # was causing infinite recursion loops when placed within the below if statements
         if change == QtWidgets.QGraphicsItem.ItemPositionHasChanged and self._main_window.uiSnapToGridAction.isChecked():
             GRID_SIZE = 75
-            self.setPos(float(GRID_SIZE * round(self.x() / GRID_SIZE)), float(GRID_SIZE * round(self.y() / GRID_SIZE)))
+            tmp_x = (GRID_SIZE * round(self.x() / GRID_SIZE)) - ((self.boundingRect().width() / 2) % GRID_SIZE)
+            tmp_y = (GRID_SIZE * round(self.y() / GRID_SIZE)) - ((self.boundingRect().height() / 2) % GRID_SIZE)
+            self.setPos(tmp_x, tmp_y)
 
         # dynamically change the renderer when this node item is selected/unselected.
         if change == QtWidgets.QGraphicsItem.ItemSelectedChange: