[FIX] Fixed crashing of the EEG view module when trying to display values at invalid time positions

src/dataHandler/io/WPagerEEGLibeep.cpp

@@ -123,7 +123,7 @@ boost::shared_ptr< WEEGValueMatrix > WPagerEEGLibeep::getValues( std::size_t seg
     {
         std::ostringstream stream;
         stream << "Could not read sample number " << start + length - 1 << " of file " << m_fileName
-               << ", it has only " << m_nbSamples << " samples";
+               << ", it only has " << m_nbSamples << " samples";
         throw WOutOfBounds( stream.str() );
     }
 

src/modules/eegView/WLineStripCallback.cpp

@@ -68,12 +68,17 @@ void WLineStripCallback::update( osg::NodeVisitor* /*nv*/, osg::Drawable* drawab
         osg::Geometry* geometry = static_cast< osg::Geometry* >( drawable );
         if( geometry )
         {
-            const std::size_t startSample = timePos * m_samplingRate;
-            const std::size_t endSample = std::ceil( ( timePos + timeRange ) * m_samplingRate ) + 1;
-            const std::size_t currentStartSample = m_currentTimePos * m_samplingRate;
+            const std::size_t nbSamples = m_segment->getNumberOfSamples();
+            const std::size_t startSample = clampToRange( timePos * m_samplingRate, 0u, nbSamples - 1u );
+            const std::size_t endSample = clampToRange( std::ceil( ( timePos + timeRange ) * m_samplingRate ) + 1.0,
+                                                        startSample,
+                                                        nbSamples );
+            const std::size_t currentStartSample = clampToRange( m_currentTimePos * m_samplingRate, 0u, nbSamples - 1u );
             const std::size_t currentEndSample = ( 0.0 <= m_currentTimeRange ) ?
-                                                     std::ceil( ( m_currentTimePos + m_currentTimeRange ) * m_samplingRate ) + 1 :
-                                                     currentStartSample;
+                    clampToRange( std::ceil( ( m_currentTimePos + m_currentTimeRange ) * m_samplingRate ) + 1.0,
+                                  currentStartSample,
+                                  nbSamples ) :
+                    currentStartSample;
 
             osg::Vec3Array* vertices = new osg::Vec3Array();
             vertices->reserve( endSample - startSample );
@@ -125,3 +130,18 @@ void WLineStripCallback::update( osg::NodeVisitor* /*nv*/, osg::Drawable* drawab
         m_currentTimeRange = timeRange;
     }
 }
+
+std::size_t WLineStripCallback::clampToRange( double value, std::size_t min, std::size_t max ) const
+{
+    std::size_t out = ( value > 0.0 ) ? value : 0u;
+    if( out < min )
+    {
+        out = min;
+    }
+    else if( max < out )
+    {
+        out = max;
+    }
+
+    return out;
+}

src/modules/eegView/WLineStripCallback.h

@@ -106,6 +106,17 @@ private:
      * sampling rate used by the recording
      */
     double m_samplingRate;
+
+    /**
+     * Convert the given double value to std::size_t and clamp it into the given
+     * range
+     *
+     * \param value value to convert
+     * \param min   minimum of the valid range
+     * \param max   maximum of the valid range
+     * \return converted value
+     */
+    std::size_t clampToRange( double value, std::size_t min, std::size_t max ) const;
 };
 
 #endif  // WLINESTRIPCALLBACK_H