@@ -13,6 +13,7 @@ ADD_DEFINITIONS(-std=c++11)
 find_package(Qt5Widgets)
 find_package(Qt5Core)
 find_package(Qt5Gui)
+find_package(Qt5OpenGL)
 
 add_definitions(${Qt5Widgets_DEFINITIONS})
 set(CMAKE_CXX_FLAGS "${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS}")
@@ -25,11 +26,12 @@ add_executable(blocks
 )
 
 # Use the Widgets module from Qt 5.
-qt5_use_modules(blocks Widgets Gui Core)
+qt5_use_modules(blocks Widgets Gui Core OpenGL)
 
 
 target_link_libraries(blocks
   ${Qt5Widgets_LIBRARIES}
   ${Qt5Core_LIBRARIES}
   ${QtGui_LIBRARIES}
+  ${QtOpenGL_LIBRARIES}
   )
@@ -68,12 +68,12 @@ onItemMoved(QUuid id, QPointF const &offset)
 }
 
 
-//QPainterPath
-//ConnectionGraphicsObject::
-//shape() const
-//{
-  //return _connectionPainter.painterPath();
-//}
+QPainterPath
+ConnectionGraphicsObject::
+shape() const
+{
+  return _connectionPainter.cubicPath();
+}
 
 
 void
 
@@ -27,7 +27,7 @@ class ConnectionGraphicsObject
 public slots:
   void onItemMoved(QUuid id, QPointF const &offset);
 
-  //QPainterPath shape() const override;
+  QPainterPath shape() const override;
 
 protected:
   void paint(QPainter* painter,
 
@@ -16,10 +16,8 @@ class ConnectionPainter
 
 public:
 
-  QPainterPath painterPath() const
+  QPainterPath cubicPath() const
   {
-    QPainterPath path;
-
     QPointF const& source = _connectionGeometry.source();
     QPointF const& sink   = _connectionGeometry.sink();
 
@@ -30,7 +28,7 @@ class ConnectionPainter
 
     double const defaultOffset = 200;
 
-    double const lineWidth     = _connectionGeometry.lineWidth();
+    double const lineWidth = _connectionGeometry.lineWidth();
 
     double const ratio1 = 0.5;
 
@@ -44,19 +42,29 @@ class ConnectionPainter
     QPointF c1(source.x() + defaultOffset * ratio1, source.y() + 2 * verticalOffset);
     QPointF c2(sink.x() - defaultOffset * ratio1, sink.y() + verticalOffset);
 
-    QPen p;
-
-    p.setWidth(2 * lineWidth);
-
     // cubic spline
     QPainterPath cubic(source);
     cubic.cubicTo(c1, c2, sink);
 
-    path.addPath(cubic);
+    QPainterPath result(source);
+
+    unsigned segments = 20;
+
+    for (auto i = 0ul; i < segments; ++i)
+    {
+      result.lineTo(cubic.pointAtPercent( double(i + 1) / segments ));
+    }
 
-    return path;
+    QPainterPathStroker stroker; stroker.setWidth(10.0);
+
+    return stroker.createStroke(result);
   }
 
+  //QPainterPath painterPath() const
+  //{
+  //return cubicPath();
+  //}
+
   inline
   void paint(QPainter* painter) const
   {
@@ -101,6 +109,10 @@ class ConnectionPainter
       painter->drawLine(QLineF(c2, sink));
       painter->drawEllipse(c1, 4, 4);
       painter->drawEllipse(c2, 4, 4);
+
+      painter->setBrush(Qt::NoBrush);
+
+      painter->drawPath(cubicPath());
     }
 #endif
 
 
@@ -7,10 +7,13 @@
 #include <QtGui/QWheelEvent>
 #include <QtCore/QRectF>
 
+
+#include <QtOpenGL>
+#include <QtWidgets>
+
 #include <QDebug>
 #include <iostream>
 
-
 FlowGraphicsView::
 FlowGraphicsView(QGraphicsScene *scene)
   : QGraphicsView(scene)
@@ -19,7 +22,7 @@ FlowGraphicsView(QGraphicsScene *scene)
   setRenderHint(QPainter::Antialiasing);
   setBackgroundBrush(QColor(Qt::gray).darker(300));
 
-  //setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
+  setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
 
   setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
 }