diff --git a/src/MainWindow.cpp b/src/MainWindow.cpp
index 1403ac7..a46f72d 100644
--- a/src/MainWindow.cpp
+++ b/src/MainWindow.cpp
@@ -139,6 +139,9 @@ MainWindow::MainWindow(ApplicationController* appController, QWidget *parent)
     connect(m_appController, &ApplicationController::sketchModeStarted, m_viewport, &ViewportWidget::onSketchModeStarted);
     connect(m_appController, &ApplicationController::sketchModeEnded, m_viewport, &ViewportWidget::onSketchModeEnded);
     connect(m_appController, &ApplicationController::currentFileChanged, this, &MainWindow::updateWindowTitle);
+    connect(m_appController, &ApplicationController::activeToolChanged, m_viewport, &ViewportWidget::onActiveToolChanged);
+
+    connect(m_viewport, &ViewportWidget::lineAdded, m_appController, &ApplicationController::addLine);
 
     updateWindowTitle(QString());
 }