1 files changed, 18 insertions, 0 deletions
diff --git a/tikzit/src/gui/nodeitem.cpp b/tikzit/src/gui/nodeitem.cpp
index d91bfd6..6e21ea4 100644
--- a/tikzit/src/gui/nodeitem.cpp
+++ b/tikzit/src/gui/nodeitem.cpp
@@ -1,7 +1,10 @@
 #include "tikzit.h"
 #include "nodeitem.h"
+#include "tikzscene.h"
+#include <cmath>
 
 #include <QPen>
+#include <QApplication>
 #include <QBrush>
 #include <QDebug>
 #include <QFont>
@@ -13,6 +16,7 @@ NodeItem::NodeItem(Node *node)
     _node = node;
     setFlag(QGraphicsItem::ItemIsSelectable);
     setFlag(QGraphicsItem::ItemIsMovable);
+    setFlag(QGraphicsItem::ItemSendsGeometryChanges);
     syncPos();
 }
 
@@ -91,3 +95,17 @@ QRectF NodeItem::boundingRect() const
 {
     return shape().boundingRect().adjusted(-4,-4,4,4);
 }
+
+QVariant NodeItem::itemChange(GraphicsItemChange change, const QVariant &value)
+{
+    if (change == ItemPositionChange) {
+        QPointF newPos = value.toPointF();
+        int gridSize = GLOBAL_SCALE / 8;
+        QPointF gridPos(round(newPos.x()/gridSize)*gridSize, round(newPos.y()/gridSize)*gridSize);
+        _node->setPoint(fromScreen(gridPos));
+
+        return gridPos;
+    } else {
+        return QGraphicsItem::itemChange(change, value);
+    }
+}