Fix positioning of qgritems

birdvisu/visualisation/annotators.py

@@ -140,9 +140,14 @@ def create_qgritems(at):
 		x = pos.x
 		y = pos.y
 
-		shape = QtWidgets.QGraphicsRectItem(x, y, size, size)
+		shape = QtWidgets.QGraphicsRectItem(-size/2, -size/2, size, size)
 		shape.setBrush(brush)
+		shape.setPos(x, y)
 		label = QtWidgets.QGraphicsSimpleTextItem(rk, parent=shape)
+		label.setY(size*0.8)
+		# Centering:
+		text_width = label.boundingRect().width()
+		label.setX(-text_width/2)
 		at.router_annotations[rk].append(shape)
 
 	for nk, n in topo.networks.items():
@@ -160,9 +165,14 @@ def create_qgritems(at):
 		x = pos.x
 		y = pos.y
 
-		shape = QtWidgets.QGraphicsRectItem(x, y, size, size)
+		shape = QtWidgets.QGraphicsRectItem(-size/2, -size/2, size, size)
 		shape.setBrush(brush)
+		shape.setPos(x, y)
 		label = QtWidgets.QGraphicsSimpleTextItem(nk, parent=shape)
+		label.setY(size*0.8)
+		# Centering:
+		text_width = label.boundingRect().width()
+		label.setX(-text_width/2)
 		at.network_annotations[nk].append(shape)
 
 	for lk, l in topo.links.items():