use mouse wheel to change fov

openglcanvas.cpp

@@ -608,6 +608,13 @@ void OpenGLCanvas::mouseMoveEvent(QMouseEvent *event){
     }
 }
 
+void OpenGLCanvas::wheelEvent(QWheelEvent *event){
+    if(event->orientation()==Qt::Vertical){
+        fov+=((double)event->delta())/60;
+        updateGL();
+    }
+}
+
 void OpenGLCanvas::paintGL(){
 
     float fov_rads = (fov/180.f)*1.5708f;

openglcanvas.h

@@ -57,6 +57,7 @@ protected:
     void setShaders();
     void mousePressEvent(QMouseEvent *event);
     void mouseMoveEvent(QMouseEvent *event);
+    void wheelEvent(QWheelEvent *event);
 
 signals:
     void fps(QString newFPS);