diff --git a/src/common/QskIntervalF.cpp b/src/common/QskIntervalF.cpp
index 7dbae1d1..42fa5b21 100644
--- a/src/common/QskIntervalF.cpp
+++ b/src/common/QskIntervalF.cpp
@@ -159,6 +159,26 @@ bool QskIntervalF::fuzzyContains( qreal value ) const
     return true;
 }
 
+bool QskIntervalF::fuzzyContains( const QskIntervalF& interval ) const
+{
+    if ( !isValid() || !interval.isValid() )
+        return false;
+
+    if ( ( interval.m_lowerBound < m_lowerBound )
+        && !qskFuzzyCompare( interval.m_lowerBound, m_lowerBound ) )
+    {
+        return false;
+    }
+
+    if ( ( interval.m_upperBound > m_upperBound )
+        && !qskFuzzyCompare( interval.m_upperBound, m_upperBound ) )
+    {
+        return false;
+    }
+
+    return true;
+}
+
 #ifndef QT_NO_DEBUG_STREAM
 
 #include <qdebug.h>
diff --git a/src/common/QskIntervalF.h b/src/common/QskIntervalF.h
index 8bf3c8d3..f8c2074b 100644
--- a/src/common/QskIntervalF.h
+++ b/src/common/QskIntervalF.h
@@ -39,7 +39,10 @@ class QSK_EXPORT QskIntervalF
     void setWidth( qreal ) noexcept;
 
     constexpr bool contains( qreal value ) const noexcept;
+    constexpr bool contains( const QskIntervalF& ) const noexcept;
+
     bool fuzzyContains( qreal value ) const;
+    bool fuzzyContains( const QskIntervalF& ) const;
 
     static constexpr QskIntervalF normalized( qreal value1, qreal value2 ) noexcept;
 
@@ -150,6 +153,12 @@ inline constexpr bool QskIntervalF::contains( qreal value ) const noexcept
     return ( value >= m_lowerBound ) && ( value <= m_upperBound );
 }
 
+inline constexpr bool QskIntervalF::contains( const QskIntervalF& interval ) const noexcept
+{
+    return interval.isValid() && contains( interval.m_lowerBound )
+        && contains( interval.m_upperBound );
+}
+
 inline void QskIntervalF::translate( qreal offset ) noexcept
 {
     m_lowerBound += offset;