Introduces public methods for starting and stopping the display refresh timer to osciwidget

osciwidget.cpp

@@ -132,15 +132,21 @@ void OsciWidget::resizeEvent(QResizeEvent *event)
     resizePixmap();
 }
 
-void OsciWidget::restartTimer()
+void OsciWidget::stop()
 {
     if (m_timerId != -1)
         killTimer(m_timerId);
+}
 
+void OsciWidget::start()
+{
     m_timerId = startTimer(1000/m_framerate);
 }
 
+void OsciWidget::restartTimer()
 {
+    stop();
+    start();
 }
 
 void OsciWidget::resizePixmap()

osciwidget.h

@@ -22,6 +22,8 @@ public:
     int framerate() const;
     int blend() const;
     float factor() const;
+    void start();
+    void stop();
 
 public slots:
     void setFramerate(int framerate);