diff --git a/src/domain.cpp b/src/domain.cpp
index d874ea9..2516cbd 100644
--- a/src/domain.cpp
+++ b/src/domain.cpp
@@ -26,6 +26,11 @@ qreal Domain::spanY() const
 	return m_maxY - m_minY;
 }
 
+bool Domain::isEmpty() const
+{
+    return spanX()==0 || spanY()==0;
+}
+
 Domain Domain::subDomain(const QRectF& rect, qreal maxWidth,qreal maxHeight) const
 {
   Domain domain;
diff --git a/src/domain_p.h b/src/domain_p.h
index db0c5ca..23fb103 100644
--- a/src/domain_p.h
+++ b/src/domain_p.h
@@ -12,6 +12,7 @@ public:
 
 	qreal spanX() const;
 	qreal spanY() const;
+	bool isEmpty() const;
 
 	friend bool operator== (const Domain &domain1, const Domain &domain2);
 	friend bool operator!= (const Domain &domain1, const Domain &domain2);