[ADD] allow to change context width interactively

src/modules/sliceContext/WMSliceContext.cpp

@@ -73,8 +73,8 @@ const std::string WMSliceContext::getDescription() const
 void WMSliceContext::connectors()
 {
     // The input fiber dataset
-    m_fiberInput = boost::shared_ptr< WModuleInputData < WDataSetFibers > >(
-        new WModuleInputData< WDataSetFibers >( shared_from_this(), "fibers", "The fiber dataset to use as context." )
+    m_fiberInput = boost::shared_ptr< WModuleInputData < const WDataSetFibers > >(
+        new WModuleInputData< const WDataSetFibers >( shared_from_this(), "fibers", "The fiber dataset to use as context." )
     );
 
     // As properties, every connector needs to be added to the list of connectors.
@@ -128,7 +128,7 @@ void WMSliceContext::moduleMain()
 
         // To query whether an input was updated, simply ask the input:
         bool dataUpdated = m_fiberInput->updated();
-        boost::shared_ptr< WDataSetFibers > fibers = m_fiberInput->getData();
+        boost::shared_ptr< const WDataSetFibers > fibers( m_fiberInput->getData() );
         bool dataValid = fibers;
 
         if ( !( dataValid && dataUpdated ) )
@@ -226,7 +226,7 @@ osg::ref_ptr< osg::Geode > WMSliceContext::genTractGeode( const std::vector< siz
     for( size_t i = 0; i < vertices->size(); ++i )
     {
         double distance = fabs( m_crosshairProp->get()[0] - ( *vertices )[i][0] );
-        texCoords->push_back( wmath::WPosition( distance, 0.0, 0.0 ) );
+        texCoords->push_back( wmath::WPosition( distance, m_contextWidthProp->get(), 0.0 ) );
     }
     geometry->setTexCoordArray( 0, texCoords );
 

src/modules/sliceContext/WMSliceContext.h

@@ -135,7 +135,7 @@ private:
      */
     void checkContainment( std::vector< size_t >* selected, bool counting, double distance ) const;
 
-    boost::shared_ptr< WModuleInputData< WDataSetFibers > > m_fiberInput; //!< The fiber dataset which is going to be filtered.
+    boost::shared_ptr< WModuleInputData< const WDataSetFibers > > m_fiberInput; //!< The fiber dataset which is going to be filtered.
 
     WPropPosition m_crosshairProp; //!< position of the navigation
     WPropInt m_insideCountProp; //!< The number of positions of a fiber that have to be inside the context for the fiber to be considered.
@@ -144,7 +144,7 @@ private:
     boost::shared_ptr< WCondition > m_propCondition; //!< A condition used to notify about changes in several properties.
 
     wmath::WPosition m_current; //!< The current position of the slices.
-    boost::shared_ptr< WDataSetFibers > m_tracts; //!< The fiber data set used for the context.
+    boost::shared_ptr< const WDataSetFibers > m_tracts; //!< The fiber data set used for the context.
     osg::ref_ptr< WGEManagedGroupNode > m_osgNode; //!< OSG node for this module.
     osg::ref_ptr< osg::Group > m_rootNode; //!< OSG node for this module.
 

src/modules/sliceContext/shaders/WMSliceContext-fragment.glsl

@@ -3,14 +3,37 @@ varying vec4 myColor;
 /*
  * simple fragment shader that uses a texture on fibers
  */
+void onlyNearFibers()
+{
+    float distance = gl_TexCoord[0].x;
+    // float maxDist = gl_TexCoord[0].y;
+    // float normalizedDistance = distance / maxDist;
+    // normalizedDistance = clamp ( normalizedDistance, 0.0, 1.0 );
+    vec4 color = myColor;
+    color.a = .1;
+    if( distance > 1 )
+        color.a = 0;
+    gl_FragColor = color;
+}
+
+
 void main()
 {
     vec4 color = myColor;
-    float alpha = 1 - ( gl_TexCoord[0].x / 100. );
+    float distance = gl_TexCoord[0].x;
+    float maxDist = gl_TexCoord[0].y;
+    distance = clamp( distance, 0, maxDist);
+    float alpha = 1 - ( distance / maxDist);
+    alpha *= alpha;
+    alpha *= alpha;
+    alpha *= alpha;
+    alpha *= alpha;
+    alpha *= alpha;
     float darkness = clamp( alpha *.3, 0.0, 1.0);
-    alpha = clamp( pow( alpha, 100. ) +.1 , 0.0, 1.0);
-    color = vec4( darkness, clamp( .5 - darkness, 0.0, 1.0), 1.0, alpha );
+    //color = vec4( darkness, clamp( .5 - darkness, 0.0, 1.0), 1.0, .01 + alpha );
+    color.a = .01 + alpha;
 
     gl_FragColor = color;
-}
 
+//    onlyNearFibers();
+}