meshviewerwidgett.cc

penMesh is a generic and efficient data structure for representing and manipulating polygonal meshes

    glBegin(GL_TRIANGLES);
    for (; fIt!=fEnd; ++fIt)
    {
      fvIt = mesh_.cfv_iter(fIt.handle()); 
      glArrayElement(fvIt.handle().idx());
      ++fvIt;
      glArrayElement(fvIt.handle().idx());
      ++fvIt;
      glArrayElement(fvIt.handle().idx());
    }
    glEnd();
    
    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_NORMAL_ARRAY);
    glDisableClientState(GL_COLOR_ARRAY);
  }  


  else if (_draw_mode == "Solid Colored Faces") // -----------------------------
  {
    glEnableClientState(GL_VERTEX_ARRAY);
    glVertexPointer(3, GL_FLOAT, 0, mesh_.points());

    glEnableClientState(GL_NORMAL_ARRAY);
    glNormalPointer(GL_FLOAT, 0, mesh_.vertex_normals());

    glBegin(GL_TRIANGLES);
    for (; fIt!=fEnd; ++fIt)
    {
      glColor( fIt.handle() );

      fvIt = mesh_.cfv_iter(fIt.handle()); 
      glArrayElement(fvIt.handle().idx());
      ++fvIt;
      glArrayElement(fvIt.handle().idx());
      ++fvIt;
      glArrayElement(fvIt.handle().idx());
    }
    glEnd();
    
    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_NORMAL_ARRAY);
  }  


  else if (_draw_mode == "Smooth Colored Faces") // ---------------------------
  {
    glEnableClientState(GL_VERTEX_ARRAY);
    glVertexPointer(3, GL_FLOAT, 0, mesh_.points());

    glEnableClientState(GL_NORMAL_ARRAY);
    glNormalPointer(GL_FLOAT, 0, mesh_.vertex_normals());

    glBegin(GL_TRIANGLES);
    for (; fIt!=fEnd; ++fIt)
    {
      glMaterial( fIt.handle() );

      fvIt = mesh_.cfv_iter(fIt.handle()); 
      glArrayElement(fvIt.handle().idx());
      ++fvIt;
      glArrayElement(fvIt.handle().idx());
      ++fvIt;
      glArrayElement(fvIt.handle().idx());
    }
    glEnd();
    
    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_NORMAL_ARRAY);
  }  


  else if ( _draw_mode == "Strips'n VertexArrays" ) // ------------------------
  {
    glEnableClientState(GL_VERTEX_ARRAY);
    glVertexPointer(3, GL_FLOAT, 0, mesh_.points());

    glEnableClientState(GL_NORMAL_ARRAY);
    glNormalPointer(GL_FLOAT, 0, mesh_.vertex_normals());

    if ( tex_id_ && mesh_.has_vertex_texcoords2D() )
    {
      glEnableClientState(GL_TEXTURE_COORD_ARRAY);
      glTexCoordPointer(2, GL_FLOAT, 0, mesh_.texcoords2D());
      glEnable(GL_TEXTURE_2D);
      glBindTexture(GL_TEXTURE_2D, tex_id_);
      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, tex_mode_);
    }

    typename MyStripifier::StripsIterator strip_it = strips_.begin();
    typename MyStripifier::StripsIterator strip_last = strips_.end();

    // Draw all strips
    for (; strip_it!=strip_last; ++strip_it)
    {
      glDrawElements(GL_TRIANGLE_STRIP, 
		     strip_it->size(), GL_UNSIGNED_INT, &(*strip_it)[0] );
    }

    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_NORMAL_ARRAY);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
  }


  else if (_draw_mode == "Show Strips" && strips_.is_valid() ) // -------------
  {
    typename MyStripifier::StripsIterator strip_it = strips_.begin();
    typename MyStripifier::StripsIterator strip_last = strips_.end();

    float cmax  = 256.0f;
    int   range = 220;
    int   base  = (int)cmax-range;
    int   drcol  = 13;
    int   dgcol  = 31;
    int   dbcol  = 17;
    
    int rcol=0, gcol=dgcol, bcol=dbcol+dbcol;
         
    // Draw all strips
    for (; strip_it!=strip_last; ++strip_it)
    {
      typename MyStripifier::IndexIterator idx_it   = strip_it->begin();
      typename MyStripifier::IndexIterator idx_last = strip_it->end();
      
      rcol = (rcol+drcol) % range;
      gcol = (gcol+dgcol) % range;
      bcol = (bcol+dbcol) % range;
      
      glBegin(GL_TRIANGLE_STRIP);
      glColor3f((rcol+base)/cmax, (gcol+base)/cmax, (bcol+base)/cmax);
      for ( ;idx_it != idx_last; ++idx_it )
        glVertex3fv(&mesh_.point( OM_TYPENAME Mesh::VertexHandle(*idx_it))[0]);
      glEnd();
    }
    glColor3f(1.0, 1.0, 1.0);
  }


  else if( _draw_mode == "Points" ) // -----------------------------------------
  {
    glEnableClientState(GL_VERTEX_ARRAY);
    glVertexPointer(3, GL_FLOAT, 0, mesh_.points());

    if (mesh_.has_vertex_colors() && use_color_)
    {
      glEnableClientState(GL_COLOR_ARRAY);
      glColorPointer(3, GL_UNSIGNED_BYTE, 0, mesh_.vertex_colors());
    }

    glDrawArrays( GL_POINTS, 0, mesh_.n_vertices() );
    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_COLOR_ARRAY);
  }


}


//-----------------------------------------------------------------------------


template <typename M>
void 
MeshViewerWidgetT<M>::draw_scene(const std::string& _draw_mode)
{
  
  if ( ! mesh_.n_vertices() )
    return;
   
#if defined(OM_USE_OSG) && OM_USE_OSG
  else if ( _draw_mode == "OpenSG Indices")
  {     
    glEnable(GL_LIGHTING);
    glShadeModel(GL_SMOOTH);
    draw_openmesh( _draw_mode );
  }     
  else
#endif
  if ( _draw_mode == "Points" )
  {
    glDisable(GL_LIGHTING);
    draw_openmesh(_draw_mode);
  }
  else if (_draw_mode == "Wireframe")
  {
    glDisable(GL_LIGHTING);
    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
    draw_openmesh(_draw_mode);
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  }
  
  else if ( _draw_mode == "Hidden-Line" )
  {
    glDisable(GL_LIGHTING);
    glShadeModel(GL_FLAT);
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    glColor4f( 0.0f, 0.0f, 0.0f, 1.0f );
    glDepthRange(0.01, 1.0);
    draw_openmesh( "Wireframe" );
    
    glPolygonMode( GL_FRONT_AND_BACK, GL_LINE);
    glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
    glDepthRange( 0.0, 1.0 );
    draw_openmesh( "Wireframe" );
    
    glPolygonMode( GL_FRONT_AND_BACK, GL_FILL);          
  }
  
  else if (_draw_mode == "Solid Flat")
  {
    glEnable(GL_LIGHTING);
    glShadeModel(GL_FLAT);
    draw_openmesh(_draw_mode);
  }
  
  else if (_draw_mode == "Solid Smooth"        ||
	   _draw_mode == "Strips'n VertexArrays" )
  {
    glEnable(GL_LIGHTING);
    glShadeModel(GL_SMOOTH);
    draw_openmesh(_draw_mode);
  }
  
  else if (_draw_mode == "Show Strips")
  {
    glDisable(GL_LIGHTING);
    draw_openmesh(_draw_mode);
  }
  
  else if (_draw_mode == "Colored Vertices" )
  {
    glDisable(GL_LIGHTING);
    glShadeModel(GL_SMOOTH);
    draw_openmesh(_draw_mode);
  }

  else if (_draw_mode == "Solid Colored Faces")
  {
    glDisable(GL_LIGHTING);
    glShadeModel(GL_FLAT);
    draw_openmesh(_draw_mode);
    setDefaultMaterial();
  }
  
  else if (_draw_mode == "Smooth Colored Faces" )
  {
    glEnable(GL_LIGHTING);
    glShadeModel(GL_SMOOTH);
    draw_openmesh(_draw_mode);
    setDefaultMaterial();
  }

  if (show_vnormals_)
  {
    typename Mesh::VertexIter vit;
    glDisable(GL_LIGHTING);
    glBegin(GL_LINES);
    glColor3f(1.000f, 0.803f, 0.027f); // orange
    for(vit=mesh_.vertices_begin(); vit!=mesh_.vertices_end(); ++vit)
    {
      glVertex( vit );
      glVertex( mesh_.point( vit ) + normal_scale_*mesh_.normal( vit ) );
    }
    glEnd();
  }

  if (show_fnormals_)
  {
    typename Mesh::FaceIter fit;
    glDisable(GL_LIGHTING);
    glBegin(GL_LINES);
    glColor3f(0.705f, 0.976f, 0.270f); // greenish
    for(fit=mesh_.faces_begin(); fit!=mesh_.faces_end(); ++fit)
    {
      glVertex( mesh_.property(fp_normal_base_, fit) );
      glVertex( mesh_.property(fp_normal_base_, fit) + 
                normal_scale_*mesh_.normal( fit ) );
    }
    glEnd();
  }
}


//-----------------------------------------------------------------------------

template <typename M>
void 
MeshViewerWidgetT<M>::enable_strips() 
{ 
  if (!f_strips_)
  {
    f_strips_ = true;  
    add_draw_mode("Strips'n VertexArrays");
    add_draw_mode("Show Strips");
  }
}

//-----------------------------------------------------------------------------

template <typename M>
void 
MeshViewerWidgetT<M>::disable_strips() 
{ 
  if (f_strips_)
  {
    f_strips_ = false; 
    del_draw_mode("Show Strips");
    del_draw_mode("Strip'n VertexArrays");
  }
}


//-----------------------------------------------------------------------------

#define TEXMODE( Mode ) \
   tex_mode_ = Mode; std::cout << "Texture mode set to " << #Mode << std::endl

template <typename M>
void 
MeshViewerWidgetT<M>::keyPressEvent( QKeyEvent* _event)
{
  switch( _event->key() )
  {
    case Key_D:
      if ( mesh_.has_vertex_colors() && (current_draw_mode()=="Points") )
      {
        use_color_ = !use_color_;
        std::cout << "use color: " << (use_color_?"yes\n":"no\n");
        if (!use_color_)
          glColor3f(1.0f, 1.0f, 1.0f);
        updateGL();
      }
      break;

    case Key_N:
      if ( _event->state() & ShiftButton )
      {
        show_fnormals_ = !show_fnormals_;
        std::cout << "show face normals: " << (show_fnormals_?"yes\n":"no\n");
      }
      else
      {
        show_vnormals_ = !show_vnormals_;
        std::cout << "show vertex normals: " << (show_vnormals_?"yes\n":"no\n");
      }
      updateGL();
      break;

    case Key_I:
      std::cout << "\n# Vertices     : " << mesh_.n_vertices() << std::endl;
      std::cout << "# Edges        : " << mesh_.n_edges()    << std::endl;
      std::cout << "# Faces        : " << mesh_.n_faces()    << std::endl;
      std::cout << "binary  input  : " << opt_.check(opt_.Binary) << std::endl;
      std::cout << "swapped input  : " << opt_.check(opt_.Swap) << std::endl;
      std::cout << "vertex normal  : " 
                << opt_.check(opt_.VertexNormal) << std::endl;
      std::cout << "vertex texcoord: " 
                << opt_.check(opt_.VertexTexCoord) << std::endl;
      std::cout << "vertex color   : " 
                << opt_.check(opt_.VertexColor) << std::endl;
      std::cout << "face normal    : " 
                << opt_.check(opt_.FaceNormal) << std::endl;
      std::cout << "face color     : " 
                << opt_.check(opt_.FaceColor) << std::endl;
      this->QGLViewerWidget::keyPressEvent( _event );
      break;

    case Key_T:
      switch( tex_mode_ )
      {
        case GL_MODULATE: TEXMODE(GL_DECAL); break;
        case GL_DECAL:    TEXMODE(GL_BLEND); break;
        case GL_BLEND:    TEXMODE(GL_REPLACE); break;
        case GL_REPLACE:  TEXMODE(GL_MODULATE); break;
      }
      updateGL();
      break;

    default:
      this->QGLViewerWidget::keyPressEvent( _event );
  }
}

#undef TEXMODE

//=============================================================================