Очищение памяти у params

Canvas.cpp

@@ -117,7 +117,9 @@ void Canvas::mousePressEvent(QMouseEvent* event)
 
 				points.pop_back();
 				points.pop_back();
+				delete params.back();
 				params.pop_back();
+				delete params.back();
 				params.pop_back();
 
 				mode = Mode::None;