X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=www%2Findex.cgi;h=64314fa6520ff70122f3b54af9e6c473c8ee0665;hb=2f0fd91b461033529a4a72e161bd133252a22eb6;hp=4d833cc8005b76570bf35b3089f02983f0aa60b6;hpb=9b767a39d8f1ebed19fdd0e896a30fe058ec88e1;p=biopieces.git

diff --git a/www/index.cgi b/www/index.cgi
index 4d833cc..64314fa 100755
--- a/www/index.cgi
+++ b/www/index.cgi
@@ -26,13 +26,14 @@ use warnings;
 use lib $ENV{ 'BP_PERL' };
 
 use CGI;
+use URI::Escape;
 use Data::Dumper;
 use Digest::MD5;
+use Time::HiRes;
 use Maasha::Common;
 use Maasha::Filesys;
 use Maasha::Calc;
 use Maasha::XHTML;
-use Maasha::KISS;
 use Maasha::BGB::Session;
 use Maasha::BGB::Track;
 use Maasha::BGB::Draw;
@@ -44,10 +45,10 @@ $cookie = cookie_default( $cgi );;
 
 push @html, Maasha::XHTML::html_header(
     cgi_header  => 1,
-    title       => "Biopieces Genome Browser",
-    css_file    => "bgb.css",
-    author      => "Martin A. Hansen, mail\@maasha.dk",
-    description => "Biopieces Genome Browser",
+    title       => 'Biopieces Genome Browser',
+    css_file    => 'bgb.css',
+    author      => 'Martin A. Hansen, mail@maasha.dk',
+    description => 'Biopieces Genome Browser',
     keywords    => [ qw( Biopieces biopiece genome browser viewer bacterium bacteria prokaryote prokaryotes ) ],
     no_cache    => 1,
 );
@@ -61,13 +62,12 @@ push @html, Maasha::XHTML::form_end;
 push @html, Maasha::XHTML::body_end;
 push @html, Maasha::XHTML::html_end;
 
-# push @html, Maasha::XHTML::hdump( [ $cgi->Vars ] );  # DEBUG
-# push @html, Maasha::XHTML::hdump( \%ENV );           # DEBUG
+# push @html, Maasha::XHTML::hdump( { $cgi->Vars } );  # DEBUG
 # push @html, Maasha::XHTML::hdump( $cookie );         # DEBUG
+# push @html, Maasha::XHTML::hdump( \%ENV );           # DEBUG
 
 print "$_\n" foreach @html;
 
-
 # >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> SUBROUTINES <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 
 
@@ -85,7 +85,7 @@ sub cookie_default
 
     # Returns a hash.
 
-    my ( $cookie, $path );
+    my ( $cookie, $session );
 
     $cookie = {};
 
@@ -104,27 +104,54 @@ sub cookie_default
         }
     }
 
-    $cookie->{ 'SCRIPT' }          = Maasha::Common::get_scriptname();
-    $cookie->{ 'DATA_DIR' }        = "Data";
-    $cookie->{ 'SESSION_DIR' }     = "Sessions";
-    $cookie->{ 'LIST_PAGES' }      = [ qw( clade genome assembly contig browse ) ];
+    $cookie->{ 'SCRIPT' }      = Maasha::Common::get_scriptname();
+    $cookie->{ 'DATA_DIR' }    = "Data";
+    $cookie->{ 'SESSION_DIR' } = "Sessions";
+    $cookie->{ 'LIST_PAGES' }  = [ qw( clade genome assembly contig browse ) ];
+    $cookie->{ 'USER' }        = $cgi->param( 'user' );
+    $cookie->{ 'PASSWORD' }    = $cgi->param( 'password' );
+    $cookie->{ 'SESSION_ID' }  = $cgi->param( 'session_id' );
 
-    $cookie->{ 'USER' }            = $cgi->param( 'user' ) || '';
-    $cookie->{ 'PASSWORD' }        = $cgi->param( 'password' );
-    $cookie->{ 'SESSION_ID' }      = $cgi->param( 'session_id' );
+    $session = session_restore( $cookie );
 
-    cookie_session( $cookie );
     cookie_login( $cookie );
 
-    $cookie->{ 'PAGE' }          ||= $cgi->param( 'page' )     || 'login';
-    $cookie->{ 'CLADE' }           = $cgi->param( 'clade' )    || '';
-    $cookie->{ 'GENOME' }          = $cgi->param( 'genome' )   || '';
-    $cookie->{ 'ASSEMBLY' }        = $cgi->param( 'assembly' ) || '';
-    $cookie->{ 'CONTIG' }          = $cgi->param( 'contig' )   || '';
-    $cookie->{ 'Q_ID' }            = $cgi->param( 'q_id' );
-    $cookie->{ 'S_BEG' }           = $cgi->param( 's_beg' );
-    $cookie->{ 'S_END' }           = $cgi->param( 's_end' );
-    $cookie->{ 'STRAND' }          = $cgi->param( 'strand' );
+    # session_id_check( $cookie, $session );
+
+    if ( $cookie->{ 'LOGIN_ERROR' } or $cookie->{ 'SESSION_ERROR' } )
+    {
+        $cookie->{ 'PAGE' } = 'login';
+    }
+    elsif ( $cookie->{ 'LOGIN' } )
+    {
+        if ( $cgi->param( 'genome' ) ) {
+            $cookie->{ 'PAGE' } = 'browse';
+        } else {
+            $cookie->{ 'PAGE' } = $session->{ 'PAGE' } || 'clade';
+        }
+    }
+    elsif ( not defined $cookie->{ 'USER' } )
+    {
+        $cookie->{ 'PAGE' } = 'login';
+    }
+    else
+    {
+         $cookie->{ 'PAGE' } = $cgi->param( 'page' ) || 'login';
+    }
+
+    $cookie->{ 'TRACK_STATUS' }    = $session->{ 'TRACK_STATUS' };
+    $cookie->{ 'CLADE' }           = $cgi->param( 'clade' )       || $session->{ 'CLADE' };
+    $cookie->{ 'GENOME' }          = $cgi->param( 'genome' )      || $session->{ 'GENOME' };
+    $cookie->{ 'ASSEMBLY' }        = $cgi->param( 'assembly' )    || $session->{ 'ASSEMBLY' };
+    $cookie->{ 'CONTIG' }          = $cgi->param( 'contig' )      || $session->{ 'CONTIG' };
+    $cookie->{ 'Q_ID' }            = $cgi->param( 'q_id' )        || $session->{ 'Q_ID' };
+    $cookie->{ 'NAV_START' }     ||= defined $cgi->param( 'nav_start' ) ? $cgi->param( 'nav_start' ) : $session->{ 'NAV_START' };
+    $cookie->{ 'NAV_END' }       ||= defined $cgi->param( 'nav_end' )   ? $cgi->param( 'nav_end' )   : $session->{ 'NAV_END' };
+    $cookie->{ 'NAV_CENTER' }      = $cgi->param( 'nav_center' );
+    $cookie->{ 'S_BEG' }           = defined $cgi->param( 's_beg' ) ? $cgi->param( 's_beg' ) : $session->{ 'S_BEG' };
+    $cookie->{ 'S_END' }           = defined $cgi->param( 's_end' ) ? $cgi->param( 's_end' ) : $session->{ 'S_END' };
+    $cookie->{ 'STRAND' }          = $cgi->param( 'strand' )      || $session->{ 'STRAND' };
+    $cookie->{ 'TRACK' }           = $cgi->param( 'track' );
     $cookie->{ 'ZOOM_IN1' }        = $cgi->param( 'zoom_in1' );
     $cookie->{ 'ZOOM_IN2' }        = $cgi->param( 'zoom_in2' );
     $cookie->{ 'ZOOM_IN3' }        = $cgi->param( 'zoom_in3' );
@@ -138,95 +165,164 @@ sub cookie_default
     $cookie->{ 'MOVE_RIGHT2' }     = $cgi->param( 'move_right2' );
     $cookie->{ 'MOVE_RIGHT3' }     = $cgi->param( 'move_right3' );
 
-    $cookie->{ 'IMG_WIDTH' }       = 1200;
-    $cookie->{ 'IMG_HEIGHT' }      = 800;
+    $cookie->{ 'IMG_WIDTH' }       = 1200;   # Width of browser image in pixels
+    $cookie->{ 'IMG_HEIGHT' }      = 800;    # Height of browser image in pixels  # TODO: Redundant?
+    $cookie->{ 'WIGGLE_HEIGHT' }   = 75;     # Height of Wiggle tracks in pixels
     $cookie->{ 'TRACK_OFFSET' }    = 20;
     $cookie->{ 'TRACK_SPACE' }     = 20;
-    $cookie->{ 'RULER_FONT_SIZE' } = 10;
+    $cookie->{ 'RULER_FONT_SIZE' } = 10;     # Size of ruler font in pixels
     $cookie->{ 'RULER_COLOR' }     = [ 0, 0, 0 ];
     $cookie->{ 'SEQ_FONT_SIZE' }   = 10;
     $cookie->{ 'SEQ_COLOR' }       = [ 0, 0, 0, ];
     $cookie->{ 'FEAT_WIDTH' }      = 5;
     $cookie->{ 'FEAT_COLOR' }      = [ 0, 0, 0 ];
-    $cookie->{ 'FEAT_MAX' }        = 5000;
+#    $cookie->{ 'FEAT_MAX' }        = 5000;   # TODO: Reduntant?
+
+#    $cookie->{ 'LIST_USER' }       = Maasha::BGB::Track::list_users();  # TODO: Redundant?
+
+    if ( $cookie->{ 'USER' } and not $cookie->{ 'LOGIN_ERROR' } )
+    {
+        $cookie->{ 'LIST_CLADE' }      = Maasha::BGB::Track::list_clades(     $cookie->{ 'USER' } );
+
+        if ( $cookie->{ 'CLADE' } )
+        {
+            $cookie->{ 'LIST_GENOME' }     = Maasha::BGB::Track::list_genomes(    $cookie->{ 'USER' }, $cookie->{ 'CLADE' } );
 
-    $path = "$cookie->{ 'DATA_DIR' }/Users";
+            if ( $cookie->{ 'GENOME' } )
+            {
+                $cookie->{ 'LIST_ASSEMBLY' }   = Maasha::BGB::Track::list_assemblies( $cookie->{ 'USER' }, $cookie->{ 'CLADE' }, $cookie->{ 'GENOME' } );
 
-    $cookie->{ 'LIST_USER' }       = Maasha::Filesys::ls_dirs_base( $path ) if -d $path;
+                if ( $cookie->{ 'ASSEMBLY' } )
+                {
+                    $cookie->{ 'LIST_CONTIG' }     = Maasha::BGB::Track::list_contigs(    $cookie->{ 'USER' }, $cookie->{ 'CLADE' }, $cookie->{ 'GENOME' }, $cookie->{ 'ASSEMBLY' } );
+                }
+            }
+        }
 
-    $path .= "/$cookie->{ 'USER' }";
+        if ( $cookie->{ 'CONTIG' } )
+        {
+            cookie_start( $cookie );
+            cookie_end( $cookie );
+            cookie_zoom( $cookie );
+            cookie_move( $cookie );
+            cookie_center( $cookie );
+            cookie_track_status( $cookie );
+        }
+    }
 
-    $cookie->{ 'LIST_CLADE' }      = Maasha::Filesys::ls_dirs_base( $path ) if -d $path;
+    $cookie->{ 'STRAND' } = '+' if defined $cookie->{ 'STRAND' } and $cookie->{ 'STRAND' } eq ' ';   # FIXME ugly HTML fix
 
-    $path .= "/$cookie->{ 'CLADE' }";
+    session_store( $cookie, $session );
 
-    $cookie->{ 'LIST_GENOME' }     = Maasha::Filesys::ls_dirs_base( $path ) if -d $path;
+    return wantarray ? %{ $cookie } : $cookie;
+}
 
-    $path .= "/$cookie->{ 'GENOME' }";
 
-    $cookie->{ 'LIST_ASSEMBLY' }   = Maasha::Filesys::ls_dirs_base( $path ) if -d $path;
+sub session_restore
+{
+    # Martin A. Hansen, March 2010.
 
-    $path .= "/$cookie->{ 'ASSEMBLY' }";
+    # Restores session and returns this.
 
-    $cookie->{ 'LIST_CONTIG' }     = Maasha::Filesys::ls_dirs_base( $path ) if -d $path;
+    my ( $cookie,   # cookie hash
+       ) = @_;
 
-    if ( $cookie->{ 'CONTIG' } )
-    {
-        cookie_start( $cookie );
-        cookie_end( $cookie );
-        cookie_zoom( $cookie );
-        cookie_move( $cookie );
-    }
+    # Returns hashref.
 
-    $cookie->{ 'STRAND' } = '+' if defined $cookie->{ 'STRAND' } and $cookie->{ 'STRAND' } eq ' ';   # FIXME ugly HTML fix
+    my ( $session );
 
-    return wantarray ? %{ $cookie } : $cookie;
+    if ( defined $cookie->{ 'USER' } and -d "$cookie->{ 'SESSION_DIR' }/$cookie->{ 'USER' }" ) {
+        $session = Maasha::BGB::Session::session_restore( "$cookie->{ 'SESSION_DIR' }/$cookie->{ 'USER' }/session.json" );
+    }
+
+    return wantarray ? %{ $session } : $session;
 }
 
 
-sub cookie_session
+sub session_store
 {
-    # Martin A. Hansen, December 2009.
+    # Martin A. Hansen, March 2010.
 
-    # Check cookie information against session information.
+    # Store a session updated with cookie information to session file.
 
-    my ( $cookie,   # cookie hash
+    my ( $cookie,    # cookie hash
+         $session,   # session hash
        ) = @_;
 
     # Returns nothing.
 
-    my ( $session );
+    my ( $new_session );
 
-    $session = Maasha::BGB::Session::session_restore( "$cookie->{ 'SESSION_DIR' }/sessions.txt" );
-
-    # if ( $cookie->{ 'SESSION_ID' } )
-    # {
-    #     if ( $cookie->{ 'SESSION_ID' } ne $ENV{ 'SSL_SESSION_ID' } ) {
-    #         $cookie->{ 'PAGE' } = 'login';
-    #         print STDERR "HER1"; # DEBUG
-    #     }
-    # }
-    # else
-    # {
-    #     $cookie->{ 'PAGE' } = 'login';
-    # 
-    #     print STDERR "HER2"; # DEBUG
-    # }
-
-    if ( exists $session->{ $cookie->{ 'USER' } } and $cookie->{ 'SESSION_ID' } )
+    if ( defined $cookie->{ 'USER' } and $cookie->{ 'USER' } ne '' and -d "$cookie->{ 'SESSION_DIR' }/$cookie->{ 'USER' }" )
     {
-        if ( $session->{ $cookie->{ 'USER' } }->{ 'SESSION_ID' } ne $cookie->{ 'SESSION_ID' } ) {
-            $cookie->{ 'PAGE' } = 'login';
-            print STDERR "HER3"; # DEBUG
+        $new_session->{ 'PASSWORD' }   = $session->{ 'PASSWORD' };
+        $new_session->{ 'SESSION_ID' } = $session->{ 'SESSION_ID' };
+        $new_session->{ 'TIME' }       = Maasha::Common::time_stamp();
+        $new_session->{ 'PAGE' }       = $cookie->{ 'PAGE' };
+
+        if ( $cookie->{ 'PAGE' } =~ /browse|export_pdf|export_svg/ )
+        {
+            $new_session->{ 'CLADE' }     = $cookie->{ 'CLADE' };
+            $new_session->{ 'GENOME' }    = $cookie->{ 'GENOME' };
+            $new_session->{ 'ASSEMBLY' }  = $cookie->{ 'ASSEMBLY' };
+            $new_session->{ 'CONTIG' }    = $cookie->{ 'CONTIG' };
+            $new_session->{ 'NAV_START' } = $cookie->{ 'NAV_START' };
+            $new_session->{ 'NAV_END' }   = $cookie->{ 'NAV_END' };
+        }
+        elsif ( $cookie->{ 'PAGE' } eq 'contig' )
+        {
+            $new_session->{ 'CLADE' }     = $cookie->{ 'CLADE' };
+            $new_session->{ 'GENOME' }    = $cookie->{ 'GENOME' };
+            $new_session->{ 'ASSEMBLY' }  = $cookie->{ 'ASSEMBLY' };
+        }
+        elsif ( $cookie->{ 'PAGE' } eq 'assembly' )
+        {
+            $new_session->{ 'CLADE' }     = $cookie->{ 'CLADE' };
+            $new_session->{ 'GENOME' }    = $cookie->{ 'GENOME' };
         }
+        elsif ( $cookie->{ 'PAGE' } eq 'genome' )
+        {
+            $new_session->{ 'CLADE' }     = $cookie->{ 'CLADE' };
+        }
+        elsif ( $cookie->{ 'PAGE' } =~ /export|dna/ )
+        {
+            $new_session->{ 'CLADE' }     = $cookie->{ 'CLADE' };
+            $new_session->{ 'GENOME' }    = $cookie->{ 'GENOME' };
+            $new_session->{ 'ASSEMBLY' }  = $cookie->{ 'ASSEMBLY' };
+            $new_session->{ 'CONTIG' }    = $cookie->{ 'CONTIG' };
+            $new_session->{ 'Q_ID' }      = $cookie->{ 'Q_ID' };
+            $new_session->{ 'S_BEG' }     = $cookie->{ 'S_BEG' };
+            $new_session->{ 'S_END' }     = $cookie->{ 'S_END' };
+            $new_session->{ 'STRAND' }    = $cookie->{ 'STRAND' };
+        }
+
+        $new_session->{ 'TRACK_STATUS' } = $cookie->{ 'TRACK_STATUS' };
+
+        Maasha::BGB::Session::session_store( "$cookie->{ 'SESSION_DIR' }/$cookie->{ 'USER' }/session.json", $new_session );
     }
-    else
+}
+
+
+sub session_id_check
+{
+    # Martin A. Hansen, March 2010.
+
+    # Check that the session id in the cookie and session match.
+    # Sets SESSION_ERROR flag in cookie if not matching.
+
+    my ( $cookie,    # cookie hash
+         $session,   # session hash
+       ) = @_;
+
+    # Returns nothing.
+
+    if ( defined $cookie->{ 'SESSION_ID' } and defined $session->{ 'SESSION_ID' } )
     {
-        $cookie->{ 'PAGE' } = 'login';
-        print STDERR "HER4"; # DEBUG
-        print STDERR "NO COOKIE SESSION ID\n" if not $cookie->{ 'SESSION_ID' }; # DEBUG
-        print STDERR "NO COOKIE SESSION ID\n" if not $cookie->{ 'USER' }; # DEBUG
-        print STDERR "NO SESSION USER\n"      if not exists $session->{ $cookie->{ 'USER' } }; # DEBUG
+        if ( $cookie->{ 'SESSION_ID' } ne $session->{ 'SESSION_ID' } ) {
+            $cookie->{ 'SESSION_ERROR' } = 1;
+        } else {
+            $cookie->{ 'SESSION_ERROR' } = 0;
+        }
     }
 }
 
@@ -245,26 +341,27 @@ sub cookie_login
 
     my ( $session );
 
-    if ( $cookie->{ 'USER' } and $cookie->{ 'PASSWORD' } )
+    if ( defined $cookie->{ 'PASSWORD' } )
     {
-        $session = Maasha::BGB::Session::session_restore( "$cookie->{ 'SESSION_DIR' }/sessions.txt" );
-    
-        if ( exists $session->{ $cookie->{ 'USER' } } and
-             $session->{ $cookie->{ 'USER' } }->{ 'PASSWORD' } eq Digest::MD5::md5_hex( $cookie->{ 'PASSWORD' } ) )
+        if ( defined $cookie->{ 'USER' } and -d "$cookie->{ 'SESSION_DIR' }/$cookie->{ 'USER' }" )
         {
-            $session->{ $cookie->{ 'USER' } }->{ 'SESSION_ID' } ||= Maasha::BGB::Session::session_new();
-            # $session->{ $cookie->{ 'USER' } }->{ 'SESSION_ID' }   = $ENV{ 'SSL_SESSION_ID' };
-            $session->{ $cookie->{ 'USER' } }->{ 'TIME' }         = Maasha::Common::time_stamp();
-
-            $cookie->{ 'SESSION_ID' } = $session->{ $cookie->{ 'USER' } }->{ 'SESSION_ID' };
-            $cookie->{ 'LOGIN' }      = "OK";
-            $cookie->{ 'PAGE' }       = 'clade'; 
-
-            Maasha::BGB::Session::session_store( "$cookie->{ 'SESSION_DIR' }/sessions.txt", $session );
+            $session = Maasha::BGB::Session::session_restore( "$cookie->{ 'SESSION_DIR' }/$cookie->{ 'USER' }/session.json" );
+
+            if ( $session->{ 'PASSWORD' } eq Digest::MD5::md5_hex( $cookie->{ 'PASSWORD' } ) )
+            {
+                $cookie->{ 'TIME' }          = Maasha::Common::time_stamp();
+                $cookie->{ 'SESSION_ID' }  ||= Maasha::BGB::Session::session_new();
+                $cookie->{ 'LOGIN' }         = 1;
+                $cookie->{ 'LOGIN_ERROR' }   = 0;
+            }
+            else
+            {
+                $cookie->{ 'LOGIN_ERROR' } = 1;
+            }
         }
         else
         {
-            $cookie->{ 'LOGIN' } = "ERROR";
+            $cookie->{ 'LOGIN_ERROR' } = 1;
         }
     }
 }
@@ -378,6 +475,8 @@ sub cookie_move
     my ( $cookie,   # cookie hash
        ) = @_;
 
+    # Returns nothing.
+    
     my ( $max, $dist, $shift, $new_start, $new_end );
 
     $max = Maasha::Filesys::file_size( Maasha::BGB::Track::path_seq( $cookie ) );
@@ -412,74 +511,60 @@ sub cookie_move
 }
 
 
-sub cookie_href
+sub cookie_center
 {
-    # Martin A. Hansen, November 2009.
-
-    # Returns the href for a taxonomy path terminated at a given
-    # page using information stored in a cookie.
+    # Martin A. Hansen, March 2010.
+   
+    # Adjust the cookie values for NAV_START and NAV_END based
+    # on cookie CENTER value if defined.
 
     my ( $cookie,   # cookie hash
-         $page,     # page
        ) = @_;
 
-    # Returns a string.
-
-    my ( @href_list, %href_hash, $href );
+    # Returns nothing.
 
-    $href_hash{ "user" } = $cookie->{ 'USER' } if $cookie->{ 'USER' };
+    my ( $l_dist, $r_dist );
 
-    while ( 1 )
+    if ( defined $cookie->{ 'NAV_CENTER' } )
     {
-        $href_hash{ "clade" } = $cookie->{ 'CLADE' }        if $cookie->{ 'CLADE' };
-        last if $page eq 'clade';
-        $href_hash{ "genome" } = $cookie->{ 'GENOME' }      if $cookie->{ 'GENOME' };
-        last if $page eq 'genome';
-        $href_hash{ "assembly" } = $cookie->{ 'ASSEMBLY' }  if $cookie->{ 'ASSEMBLY' };
-        last if $page eq 'assembly';
-        $href_hash{ "contig" } = $cookie->{ 'CONTIG' }      if $cookie->{ 'CONTIG' };
-        last if $page eq 'contig';
-        last;
-    }
+        $l_dist = $cookie->{ 'NAV_CENTER' } - $cookie->{ 'NAV_START' };
+        $r_dist = $cookie->{ 'NAV_END' } - $cookie->{ 'NAV_CENTER' };
 
-    if ( defined $cookie->{ 'NAV_START' } and defined $cookie->{ 'NAV_END' } ) {
-        $href_hash{ "nav_search" } = "$cookie->{ 'NAV_START' }-$cookie->{ 'NAV_END' }";
-    }
-
-    $href_hash{ "s_beg" }      = $cookie->{ 'S_BEG' }      if defined $cookie->{ 'S_BEG' };
-    $href_hash{ "s_end" }      = $cookie->{ 'S_END' }      if defined $cookie->{ 'S_END' };
-    $href_hash{ "q_id" }       = $cookie->{ 'Q_ID' }       if defined $cookie->{ 'Q_ID' };
-    $href_hash{ "strand" }     = $cookie->{ 'STRAND' }     if defined $cookie->{ 'STRAND' };
-    $href_hash{ "session_id" } = $cookie->{ 'SESSION_ID' } if defined $cookie->{ 'SESSION_ID' };
-
-    push @href_list, "$cookie->{ 'SCRIPT' }?page=$page";
-
-    foreach $href ( keys %href_hash ) {
-        push @href_list, "$href=$href_hash{ $href }";
+        if ( $l_dist > $r_dist ) {
+            $cookie->{ 'NAV_START' } = $cookie->{ 'NAV_END' } - 2 * $r_dist;
+        } else {
+            $cookie->{ 'NAV_END' } = $cookie->{ 'NAV_START' } + 2 * $l_dist;
+        }
     }
-
-    return join "&", @href_list;
 }
 
 
-sub cookie_page_next
+sub cookie_track_status
 {
-    # Martin A. Hansen, November 2009.
-    
-    # Returns the next page in the taxonomy path.
+    # Martin A. Hansen, March 2010.
 
+    #
+    
     my ( $cookie,   # cookie hash
        ) = @_;
 
-    # Returns a string.
+    # Returns nothing.
 
-    my ( $i );
+    my ( $clade, $genome, $assembly, $track );
 
-    for ( $i = 0; $i < @{ $cookie->{ 'LIST_PAGES' } }; $i++ ) {
-        last if $cookie->{ 'PAGE' } eq $cookie->{ 'LIST_PAGES' }->[ $i ];
-    }
+    $clade    = $cookie->{ 'CLADE' };
+    $genome   = $cookie->{ 'GENOME' };
+    $assembly = $cookie->{ 'ASSEMBLY' };
+    $track    = $cookie->{ 'TRACK' };
 
-    return $cookie->{ 'LIST_PAGES' }->[ $i + 1 ];
+    if ( $track )
+    {
+        if ( $cookie->{ 'TRACK_STATUS' }->{ $clade }->{ $genome }->{ $assembly }->{ $track } ) {
+            $cookie->{ 'TRACK_STATUS' }->{ $clade }->{ $genome }->{ $assembly }->{ $track } = 0;
+        } else {
+            $cookie->{ 'TRACK_STATUS' }->{ $clade }->{ $genome }->{ $assembly }->{ $track } = 1;
+        }
+    }
 }
 
 
@@ -500,6 +585,10 @@ sub page
 
     my ( @html );
 
+    if ( $cookie->{ 'SESSION_ID' } ) {
+        push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "session_id", value => $cookie->{ 'SESSION_ID' } ) );
+    }
+
     if ( $cookie->{ 'PAGE' } eq 'login' ) {
         push @html, page_login( $cookie );
     } elsif ( $cookie->{ 'PAGE' } eq 'search' ) {
@@ -510,12 +599,18 @@ sub page
         push @html, page_dna( $cookie );
     } elsif ( $cookie->{ 'PAGE' } eq 'export' ) {
         push @html, page_export( $cookie );
-    } else {
-        push @html, page_taxonomy( $cookie );
-    }
-
-    if ( $cookie->{ 'SESSION_ID' } ) {
-        push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "session_id", value => "$cookie->{ 'SESSION_ID' }" ) );
+    } elsif ( $cookie->{ 'PAGE' } eq 'export_pdf' ) {
+        push @html, page_export_pdf( $cookie );
+    } elsif ( $cookie->{ 'PAGE' } eq 'export_svg' ) {
+        push @html, page_export_svg( $cookie );
+    } elsif ( $cookie->{ 'PAGE' } eq 'clade' ) {
+        push @html, page_clade( $cookie );
+    } elsif ( $cookie->{ 'PAGE' } eq 'genome' ) {
+        push @html, page_genome( $cookie );
+    } elsif ( $cookie->{ 'PAGE' } eq 'assembly' ) {
+        push @html, page_assembly( $cookie );
+    } elsif ( $cookie->{ 'PAGE' } eq 'contig' ) {
+        push @html, page_contig( $cookie );
     }
 
     return wantarray ? @html : \@html;
@@ -577,6 +672,7 @@ sub page_browse
     push @html, section_taxonomy_table( $cookie );
     push @html, section_navigate( $cookie );
     push @html, section_browse( $cookie );
+    push @html, section_linkout( $cookie );
 
     return wantarray ? @html : \@html;
 }
@@ -622,7 +718,107 @@ sub page_export
 }
 
 
-sub page_taxonomy
+sub page_export_pdf
+{
+    # Martin A. Hansen, March 2010.
+
+    # Renders the export PDF page.
+
+    my ( $cookie,
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @html );
+
+    push @html, section_taxonomy_table( $cookie );
+    push @html, section_export_pdf( $cookie );
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub page_export_svg
+{
+    # Martin A. Hansen, March 2010.
+
+    # Renders the export SVG page.
+
+    my ( $cookie,
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @html );
+
+    push @html, section_taxonomy_table( $cookie );
+    push @html, section_export_svg( $cookie );
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub page_clade
+{
+    # Martin A. Hansen, March 2010.
+    
+    # Renders the clade selection page.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @html );
+
+    push @html, section_taxonomy_table( $cookie );
+    push @html, section_clade( $cookie );
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub page_genome
+{
+    # Martin A. Hansen, March 2010.
+    
+    # Renders the genome selection page.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @html );
+
+    push @html, section_taxonomy_table( $cookie );
+    push @html, section_genome( $cookie );
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub page_assembly
+{
+    # Martin A. Hansen, March 2010.
+    
+    # Renders the clade selection page.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @html );
+
+    push @html, section_taxonomy_table( $cookie );
+    push @html, section_assembly( $cookie );
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub page_contig
 {
     # Martin A. Hansen, November 2009.
     
@@ -636,7 +832,7 @@ sub page_taxonomy
     my ( @html );
 
     push @html, section_taxonomy_table( $cookie );
-    push @html, section_taxonomy_select( $cookie );
+    push @html, section_contig( $cookie );
 
     return wantarray ? @html : \@html;
 }
@@ -670,7 +866,23 @@ sub section_login
     push @html, Maasha::XHTML::table_row_simple( tr => [ "", $login ] );
     push @html, Maasha::XHTML::table_end;
 
-    if ( $cookie->{ 'LOGIN' } and $cookie->{ 'LOGIN' } eq 'ERROR' ) {
+    if ( defined $cookie->{ 'CLADE' }     and
+         defined $cookie->{ 'GENOME' }    and
+         defined $cookie->{ 'ASSEMBLY' }  and
+         defined $cookie->{ 'CONTIG' }    and
+         defined $cookie->{ 'NAV_START' } and
+         defined $cookie->{ 'NAV_END' }
+    )
+    {
+        push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "clade",     value => $cookie->{ 'CLADE' } ) );
+        push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "genome",    value => $cookie->{ 'GENOME' } ) );
+        push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "assembly",  value => $cookie->{ 'ASSEMBLY' } ) );
+        push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "contig",    value => $cookie->{ 'CONTIG' } ) );
+        push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "nav_start", value => $cookie->{ 'NAV_START' } ) );
+        push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "nav_end",   value => $cookie->{ 'NAV_END' } ) );
+    }
+
+    if ( $cookie->{ 'LOGIN_ERROR' } ) {
         push @html, Maasha::XHTML::h3( txt => "Bad user or password - please retry", class => 'error' );
     }
 
@@ -697,7 +909,13 @@ sub section_taxonomy_table
     {
         last if $page eq $cookie->{ 'PAGE' } or $page eq 'browse';
 
-        $href = cookie_href( $cookie, $page );
+        $href  = "$cookie->{ 'SCRIPT' }?page=$page";
+        $href .= "&session_id=$cookie->{ 'SESSION_ID' }";
+        $href .= "&user=$cookie->{ 'USER' }";
+        $href .= "&clade=$cookie->{ 'CLADE' }"       if $page !~ /clade/;
+        $href .= "&genome=$cookie->{ 'GENOME' }"     if $page !~ /clade|genome/;
+        $href .= "&assembly=$cookie->{ 'ASSEMBLY' }" if $page !~ /clade|genome|assembly/;
+        $href .= "&contig=$cookie->{ 'CONTIG' }"     if $page !~ /clade|genome|assembly|contig/;
 
         $txt = ": $cookie->{ uc $page }";
 
@@ -713,11 +931,45 @@ sub section_taxonomy_table
 }
 
 
-sub section_taxonomy_select
+sub section_clade
 {
-    # Martin A. Hansen, November 2009.
+    # Martin A. Hansen, March 2010.
+    
+    # Returns a HTML section with clade selection choices
+    # for navigating the taxonomy tree.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @html, $clade, $href );
+
+    push @html, Maasha::XHTML::h2( txt => "Select clade", class => 'center' );
+
+    push @html, Maasha::XHTML::table_beg( summary => "Taxonomy select table", align => 'center', cellpadding => '5px' );
+
+    foreach $clade ( @{ $cookie->{ 'LIST_CLADE' } } )
+    {
+        $href  = "$cookie->{ 'SCRIPT' }?page=genome";
+        $href .= "&session_id=$cookie->{ 'SESSION_ID' }";
+        $href .= "&user=$cookie->{ 'USER' }";
+        $href .= "&clade=$clade";
+
+        push @html, Maasha::XHTML::table_row_simple( tr => [ Maasha::XHTML::ln( txt => $clade, href => $href ) ] );
+    }
+
+    push @html, Maasha::XHTML::table_end;
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub section_genome
+{
+    # Martin A. Hansen, March 2010.
     
-    # Returns a HTML section with selection choices
+    # Returns a HTML section with genome selection choices
     # for navigating the taxonomy tree.
 
     my ( $cookie,   # cookie hash
@@ -725,21 +977,94 @@ sub section_taxonomy_select
 
     # Returns a list.
 
-    my ( $list, @html, $item, $href );
+    my ( @html, $genome, $href );
+
+    push @html, Maasha::XHTML::h2( txt => "Select genome", class => 'center' );
+
+    push @html, Maasha::XHTML::table_beg( summary => "Taxonomy select table", align => 'center', cellpadding => '5px' );
+
+    foreach $genome ( @{ $cookie->{ 'LIST_GENOME' } } )
+    {
+        $href  = "$cookie->{ 'SCRIPT' }?page=assembly";
+        $href .= "&session_id=$cookie->{ 'SESSION_ID' }";
+        $href .= "&user=$cookie->{ 'USER' }";
+        $href .= "&clade=$cookie->{ 'CLADE' }";
+        $href .= "&genome=$genome";
 
-    $list = "LIST_" . uc $cookie->{ 'PAGE' };
+        push @html, Maasha::XHTML::table_row_simple( tr => [ Maasha::XHTML::ln( txt => $genome, href => $href ) ] );
+    }
 
-    push @html, Maasha::XHTML::h2( txt => "Select $cookie->{ 'PAGE' }", class => 'center' );
+    push @html, Maasha::XHTML::table_end;
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub section_assembly
+{
+    # Martin A. Hansen, March 2010.
+    
+    # Returns a HTML section with assembly selection choices
+    # for navigating the taxonomy tree.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @html, $assembly, $href );
+
+    push @html, Maasha::XHTML::h2( txt => "Select assembly", class => 'center' );
 
     push @html, Maasha::XHTML::table_beg( summary => "Taxonomy select table", align => 'center', cellpadding => '5px' );
 
-    foreach $item ( @{ $cookie->{ $list } } )
+    foreach $assembly ( @{ $cookie->{ 'LIST_ASSEMBLY' } } )
     {
-        $cookie->{ uc $cookie->{ 'PAGE' } } = $item;
+        $href  = "$cookie->{ 'SCRIPT' }?page=contig";
+        $href .= "&session_id=$cookie->{ 'SESSION_ID' }";
+        $href .= "&user=$cookie->{ 'USER' }";
+        $href .= "&clade=$cookie->{ 'CLADE' }";
+        $href .= "&genome=$cookie->{ 'GENOME' }";
+        $href .= "&assembly=$assembly";
+
+        push @html, Maasha::XHTML::table_row_simple( tr => [ Maasha::XHTML::ln( txt => $assembly, href => $href ) ] );
+    }
+
+    push @html, Maasha::XHTML::table_end;
+
+    return wantarray ? @html : \@html;
+}
+
 
-        $href = cookie_href( $cookie, cookie_page_next( $cookie ) );
+sub section_contig
+{
+    # Martin A. Hansen, March 2010.
+    
+    # Returns a HTML section with contig selection choices
+    # for navigating the taxonomy tree.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
 
-        push @html, Maasha::XHTML::table_row_simple( tr => [ Maasha::XHTML::ln( txt => $item, href => $href ) ] );
+    # Returns a list.
+
+    my ( @html, $contig, $href );
+
+    push @html, Maasha::XHTML::h2( txt => "Select contig", class => 'center' );
+
+    push @html, Maasha::XHTML::table_beg( summary => "Taxonomy select table", align => 'center', cellpadding => '5px' );
+
+    foreach $contig ( @{ $cookie->{ 'LIST_CONTIG' } } )
+    {
+        $href  = "$cookie->{ 'SCRIPT' }?page=browse";
+        $href .= "&session_id=$cookie->{ 'SESSION_ID' }";
+        $href .= "&user=$cookie->{ 'USER' }";
+        $href .= "&clade=$cookie->{ 'CLADE' }";
+        $href .= "&genome=$cookie->{ 'GENOME' }";
+        $href .= "&assembly=$cookie->{ 'ASSEMBLY' }";
+        $href .= "&contig=$contig";
+
+        push @html, Maasha::XHTML::table_row_simple( tr => [ Maasha::XHTML::ln( txt => $contig, href => $href ) ] );
     }
 
     push @html, Maasha::XHTML::table_end;
@@ -792,11 +1117,73 @@ sub section_navigate
     push @html, Maasha::XHTML::table_end;
 
     push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "page",     value => "browse" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "user",     value => "$cookie->{ 'USER' }" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "clade",    value => "$cookie->{ 'CLADE' }" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "genome",   value => "$cookie->{ 'GENOME' }" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "assembly", value => "$cookie->{ 'ASSEMBLY' }" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "contig",   value => "$cookie->{ 'CONTIG' }" ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "user",     value => $cookie->{ 'USER' } ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "clade",    value => $cookie->{ 'CLADE' } ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "genome",   value => $cookie->{ 'GENOME' } ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "assembly", value => $cookie->{ 'ASSEMBLY' } ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "contig",   value => $cookie->{ 'CONTIG' } ) );
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub section_linkout
+{
+    # Martin A. Hansen, March 2010.
+
+    # Returns a HTML section for a static link based on information in the cookie.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
+
+    # Returns a list.
+
+    my ( $link_out, $link_pdf, $link_svg, @html );
+
+    $link_out = Maasha::XHTML::ln(
+        txt  => 'link',
+        href => join( "&", "$cookie->{ 'SCRIPT' }?page=browse",
+                           "clade=$cookie->{ 'CLADE' }",
+                           "genome=$cookie->{ 'GENOME' }",
+                           "assembly=$cookie->{ 'ASSEMBLY' }",
+                           "contig=$cookie->{ 'CONTIG' }",
+                           "nav_start=$cookie->{ 'NAV_START' }",
+                           "nav_end=$cookie->{ 'NAV_END' }",
+              ),
+        title  => "Static link to this view",
+    );
+
+    $link_pdf = Maasha::XHTML::ln(
+        txt  => 'PDF',
+        href => join( "&", "$cookie->{ 'SCRIPT' }?page=export_pdf",
+                           "session_id=$cookie->{ 'SESSION_ID' }",
+                           "user=$cookie->{ 'USER' }",
+                           "clade=$cookie->{ 'CLADE' }",
+                           "genome=$cookie->{ 'GENOME' }",
+                           "assembly=$cookie->{ 'ASSEMBLY' }",
+                           "contig=$cookie->{ 'CONTIG' }",
+                           "nav_start=$cookie->{ 'NAV_START' }",
+                           "nav_end=$cookie->{ 'NAV_END' }",
+              ),
+        title  => "Export view in PDF",
+    );
+    
+    $link_svg = Maasha::XHTML::ln(
+        txt  => 'SVG',
+        href => join( "&", "$cookie->{ 'SCRIPT' }?page=export_svg",
+                           "session_id=$cookie->{ 'SESSION_ID' }",
+                           "user=$cookie->{ 'USER' }",
+                           "clade=$cookie->{ 'CLADE' }",
+                           "genome=$cookie->{ 'GENOME' }",
+                           "assembly=$cookie->{ 'ASSEMBLY' }",
+                           "contig=$cookie->{ 'CONTIG' }",
+                           "nav_start=$cookie->{ 'NAV_START' }",
+                           "nav_end=$cookie->{ 'NAV_END' }",
+              ),
+        title  => "Export view in SVG",
+    );
+
+    push @html, Maasha::XHTML::p( txt => "$link_out $link_pdf $link_svg", class => 'center' );
 
     return wantarray ? @html : \@html;
 }
@@ -809,32 +1196,23 @@ sub section_browse
 
     # Returns a list.
 
-    my ( @tracks, $i, @features, $feat, $elem, $surface, $cr, $png_data, @html, @img );
+    my ( @track_list, $i, @tracks, $track, $elem, $png_data, @html, @img, $x1, $y1, $x2, $y2, $factor, $center );
 
-    push @features, [ Maasha::BGB::Track::track_ruler( $cookie ) ];
-    push @features, [ Maasha::BGB::Track::track_seq( $cookie ) ];
+    push @tracks, [ Maasha::BGB::Track::track_ruler( $cookie ) ];
+    push @tracks, [ Maasha::BGB::Track::track_seq( $cookie ) ];
 
-    @tracks = Maasha::BGB::Track::path_tracks( $cookie );
+    @track_list = Maasha::BGB::Track::list_track_dir( $cookie->{ 'USER' }, $cookie->{ 'CLADE' }, $cookie->{ 'GENOME' }, $cookie->{ 'ASSEMBLY' }, $cookie->{ 'CONTIG' } );
 
-    for ( $i = 0; $i < @tracks; $i++ )
+    for ( $i = 0; $i < @track_list; $i++ )
     {
         $cookie->{ 'FEAT_COLOR' } = Maasha::BGB::Draw::palette( $i );
 
-        push @features, [ Maasha::BGB::Track::track_feature( $tracks[ $i ], $cookie ) ];
+        push @tracks, [ Maasha::BGB::Track::track_feature( $track_list[ $i ], $cookie ) ];
     }
 
-    $surface = Cairo::ImageSurface->create( 'argb32', $cookie->{ 'IMG_WIDTH' }, $cookie->{ 'TRACK_OFFSET' } );
-    $cr      = Cairo::Context->create( $surface );
+    unshift @tracks, [ Maasha::BGB::Track::track_grid( $cookie ) ];
 
-    $cr->rectangle ( 0, 0, $cookie->{ 'IMG_WIDTH' },  $cookie->{ 'TRACK_OFFSET' } );
-    $cr->set_source_rgb ( 1, 1, 1 );
-    $cr->fill;
-
-    foreach $feat ( @features ) {
-        Maasha::BGB::Draw::draw_feature( $cr, $feat ) if $feat;
-    }
-
-    $png_data = Maasha::BGB::Draw::base64_png( $surface );
+    $png_data = Maasha::BGB::Draw::render_png( $cookie->{ 'IMG_WIDTH' }, $cookie->{ 'TRACK_OFFSET' }, \@tracks );
 
     push @img, Maasha::XHTML::img(
         src    => "data:image/png;base64,$png_data",
@@ -847,25 +1225,103 @@ sub section_browse
 
     push @img, Maasha::XHTML::map_beg( name => "browser_map", id => "browser_map" );
 
-    foreach $feat ( @features )
-    {
-        foreach $elem ( @{ $feat } )
-        {
-            next if $elem->{ 'type' } eq 'text';
-
-            #$elem->{ 'strand' } = '&#43' if $elem->{ 'strand' } eq '+';
+    $factor = ( $cookie->{ 'NAV_END' } - $cookie->{ 'NAV_START' } + 1 ) / $cookie->{ 'IMG_WIDTH' };
 
-            $cookie->{ 'Q_ID' }   = $elem->{ 'q_id' };
-            $cookie->{ 'S_BEG' }  = $elem->{ 's_beg' };
-            $cookie->{ 'S_END' }  = $elem->{ 's_end' };
-            $cookie->{ 'STRAND' } = $elem->{ 'strand' };
+    for ( $i = 0; $i < $cookie->{ 'IMG_WIDTH' }; $i += 5 )
+    {
+        $x1 = $i;
+        $y1 = 10;
+        $x2 = $i + 5;
+        $y2 = 20;
+
+        $center = int( $cookie->{ 'NAV_START' } + $factor * $i );
+
+        push @img, Maasha::XHTML::area(
+            href   => join( "&", "$cookie->{ 'SCRIPT' }?page=browse",
+                                 "session_id=$cookie->{ 'SESSION_ID' }",
+                                 "user=$cookie->{ 'USER' }",
+                                 "clade=$cookie->{ 'CLADE' }",
+                                 "genome=$cookie->{ 'GENOME' }",
+                                 "assembly=$cookie->{ 'ASSEMBLY' }",
+                                 "contig=$cookie->{ 'CONTIG' }",
+                                 "nav_start=$cookie->{ 'NAV_START' }",
+                                 "nav_end=$cookie->{ 'NAV_END' }",
+                                 "nav_center=$center",
+                      ),
+            shape  => 'rect',
+            coords => "$x1, $y1, $x2, $y2",
+            title  => "Center on " . Maasha::Calc::commify( $center ),
+        );
+    }
 
-            push @img, Maasha::XHTML::area(
-                href   => cookie_href( $cookie, "export" ),
-                # href   => cookie_href( $cookie, "export" ) . "&q_id=$elem->{ 'q_id' }&s_beg=$elem->{ 's_beg' }&s_end=$elem->{ 's_end' }&strand=$elem->{ 'strand' }",
-                shape  => "rect",
-                coords => "$elem->{ x1 }, $elem->{ y1 }, $elem->{ x2 }, $elem->{ y2 }", title => "$elem->{ 'title' }",
-            );
+    foreach $track ( @tracks )
+    {
+        foreach $elem ( @{ $track } )
+        {
+            next if $elem->{ 'type' } =~ /grid|text|wiggle/;
+
+            if ( $elem->{ 'type' } eq 'track_name' )
+            {
+                $x1 = $elem->{ 'x1' };
+                $y1 = $elem->{ 'y1' } - 10;
+                $x2 = $elem->{ 'x1' } + 6 * length $elem->{ 'txt' };
+                $y2 = $elem->{ 'y1' };
+
+                if ( Maasha::BGB::Track::track_hide( $cookie, $elem->{ 'track' } ) )
+                {
+                    push @img, Maasha::XHTML::area(
+                        href   => join( "&", "$cookie->{ 'SCRIPT' }?page=browse",
+                                             "session_id=$cookie->{ 'SESSION_ID' }",
+                                             "user=$cookie->{ 'USER' }",
+                                             "clade=$cookie->{ 'CLADE' }",
+                                             "genome=$cookie->{ 'GENOME' }",
+                                             "assembly=$cookie->{ 'ASSEMBLY' }",
+                                             "contig=$cookie->{ 'CONTIG' }",
+                                             "track=$elem->{ 'track' }",
+                                  ),
+                        shape  => 'rect',
+                        coords => "$x1, $y1, $x2, $y2",
+                        title  => qq(Show track: $elem->{ 'txt' }),
+                    );
+                }
+                else
+                {
+                    push @img, Maasha::XHTML::area(
+                        href   => join( "&", "$cookie->{ 'SCRIPT' }?page=browse",
+                                             "session_id=$cookie->{ 'SESSION_ID' }",
+                                             "user=$cookie->{ 'USER' }",
+                                             "clade=$cookie->{ 'CLADE' }",
+                                             "genome=$cookie->{ 'GENOME' }",
+                                             "assembly=$cookie->{ 'ASSEMBLY' }",
+                                             "contig=$cookie->{ 'CONTIG' }",
+                                             "track=$elem->{ 'track' }",
+                                  ),
+                        shape  => 'rect',
+                        coords => "$x1, $y1, $x2, $y2",
+                        title  => qq(Hide track: $elem->{ 'txt' }),
+                    );
+                }
+            }
+            else
+            {
+                push @img, Maasha::XHTML::area(
+                    href     => join( "&", "$cookie->{ 'SCRIPT' }?page=export",
+                                           "session_id=$cookie->{ 'SESSION_ID' }",
+                                           "user=$cookie->{ 'USER' }",
+                                           "clade=$cookie->{ 'CLADE' }",
+                                           "genome=$cookie->{ 'GENOME' }",
+                                           "assembly=$cookie->{ 'ASSEMBLY' }",
+                                           "contig=$cookie->{ 'CONTIG' }",
+                                           "s_beg=$elem->{ 's_beg' }",
+                                           "s_end=$elem->{ 's_end' }",
+                                           "strand=$elem->{ 'strand' }",
+                                           "q_id=$elem->{ 'q_id' }",
+                              ),
+                    shape  => 'rect',
+                    coords => "$elem->{ x1 }, $elem->{ y1 }, $elem->{ x2 }, $elem->{ y2 }",
+                    title  => "$elem->{ 'title' }",
+                );
+            }
         }
     }
 
@@ -890,9 +1346,11 @@ sub section_export
 
     # Returns a list.
 
-    my ( @row_dna_contig, @html );
+    my ( $feat, @row_dna_contig, @html );
 
-    push @row_dna_contig, Maasha::XHTML::p( txt => qq(Export Feature: "$cookie->{ 'Q_ID' }" DNA from Contig: ), class => 'inline' );
+    $feat = $cookie->{ 'Q_ID' } || "[no name]";
+
+    push @row_dna_contig, Maasha::XHTML::p( txt => qq(Export Feature: "$feat" DNA from Contig: ), class => 'inline' );
     push @row_dna_contig, Maasha::XHTML::p( txt  => "$cookie->{ 'CONTIG' } Start: ", class => 'inline' );
     push @row_dna_contig, Maasha::XHTML::text( name => "s_beg", value => Maasha::Calc::commify( $cookie->{ 'S_BEG' } ), size => 15 );
     push @row_dna_contig, Maasha::XHTML::p( txt => "End: ", class => 'inline' );
@@ -906,12 +1364,86 @@ sub section_export
     push @html, Maasha::XHTML::table_row_simple( tr => \@row_dna_contig );
     push @html, Maasha::XHTML::table_end;
 
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "page", value => "dna" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "user",     value => "$cookie->{ 'USER' }" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "clade",    value => "$cookie->{ 'CLADE' }" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "genome",   value => "$cookie->{ 'GENOME' }" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "assembly", value => "$cookie->{ 'ASSEMBLY' }" ) );
-    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "contig",   value => "$cookie->{ 'CONTIG' }" ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "page",     value => "dna" ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "user",     value => $cookie->{ 'USER' } ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "clade",    value => $cookie->{ 'CLADE' } ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "genome",   value => $cookie->{ 'GENOME' } ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "assembly", value => $cookie->{ 'ASSEMBLY' } ) );
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::hidden( name => "contig",   value => $cookie->{ 'CONTIG' } ) );
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub section_export_pdf
+{
+    # Martin A. Hansen, March 2010.
+
+    # Returns a HTML section with export table.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @tracks, @track_list, $i, $file, @html );
+
+    push @tracks, [ Maasha::BGB::Track::track_ruler( $cookie ) ];
+    push @tracks, [ Maasha::BGB::Track::track_seq( $cookie ) ];
+
+    @track_list = Maasha::BGB::Track::list_track_dir( $cookie->{ 'USER' }, $cookie->{ 'CLADE' }, $cookie->{ 'GENOME' }, $cookie->{ 'ASSEMBLY' }, $cookie->{ 'CONTIG' } );
+
+    for ( $i = 0; $i < @track_list; $i++ )
+    {
+        $cookie->{ 'FEAT_COLOR' } = Maasha::BGB::Draw::palette( $i );
+
+        push @tracks, [ Maasha::BGB::Track::track_feature( $track_list[ $i ], $cookie ) ];
+    }
+
+    unshift @tracks, [ Maasha::BGB::Track::track_grid( $cookie ) ];
+
+    $file = "$cookie->{ 'SESSION_DIR' }/$cookie->{ 'USER' }/BGB_export.pdf";
+
+    Maasha::BGB::Draw::render_pdf_file( $file, $cookie->{ 'IMG_WIDTH' }, $cookie->{ 'TRACK_OFFSET' }, \@tracks );
+
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::ln( txt => "BGB_export.pdf", href => $file ), class => 'center' );
+
+    return wantarray ? @html : \@html;
+}
+
+
+sub section_export_svg
+{
+    # Martin A. Hansen, March 2010.
+
+    # Export view in SVG format.
+
+    my ( $cookie,   # cookie hash
+       ) = @_;
+
+    # Returns a list.
+
+    my ( @tracks, @track_list, $i, $file, @html );
+
+    push @tracks, [ Maasha::BGB::Track::track_ruler( $cookie ) ];
+    push @tracks, [ Maasha::BGB::Track::track_seq( $cookie ) ];
+
+    @track_list = Maasha::BGB::Track::list_track_dir( $cookie->{ 'USER' }, $cookie->{ 'CLADE' }, $cookie->{ 'GENOME' }, $cookie->{ 'ASSEMBLY' }, $cookie->{ 'CONTIG' } );
+
+    for ( $i = 0; $i < @track_list; $i++ )
+    {
+        $cookie->{ 'FEAT_COLOR' } = Maasha::BGB::Draw::palette( $i );
+
+        push @tracks, [ Maasha::BGB::Track::track_feature( $track_list[ $i ], $cookie ) ];
+    }
+
+    unshift @tracks, [ Maasha::BGB::Track::track_grid( $cookie ) ];
+
+    $file = "$cookie->{ 'SESSION_DIR' }/$cookie->{ 'USER' }/BGB_export.svg";
+
+    Maasha::BGB::Draw::render_svg_file( $file, $cookie->{ 'IMG_WIDTH' }, $cookie->{ 'TRACK_OFFSET' }, \@tracks );
+
+    push @html, Maasha::XHTML::p( txt => Maasha::XHTML::ln( txt => "BGB_export.svg", href => $file ), class => 'center' );
 
     return wantarray ? @html : \@html;
 }
@@ -952,8 +1484,35 @@ sub section_search
             $cookie->{ 'STRAND' }    = $result->{ 'STRAND' };
             $cookie->{ 'Q_ID' }      = $result->{ 'Q_ID' };
 
-            $browse = Maasha::XHTML::ln( txt => "browse", href => cookie_href( $cookie, "browse" ) );
-            $export = Maasha::XHTML::ln( txt => "export", href => cookie_href( $cookie, "export" ) );
+            $browse = Maasha::XHTML::ln(
+                txt  => "browse",
+                href => join( "&", "$cookie->{ 'SCRIPT' }?page=browse",
+                                   "session_id=$cookie->{ 'SESSION_ID' }",
+                                   "user=$cookie->{ 'USER' }",
+                                   "clade=$cookie->{ 'CLADE' }",
+                                   "genome=$cookie->{ 'GENOME' }",
+                                   "assembly=$cookie->{ 'ASSEMBLY' }",
+                                   "contig=$cookie->{ 'CONTIG' }",
+                                   "nav_start=$cookie->{ 'NAV_START' }",
+                                   "nav_end=$cookie->{ 'NAV_END' }",
+                ),
+            );
+
+
+            $export = Maasha::XHTML::ln(
+                txt  => "export",
+                href => join( "&", "$cookie->{ 'SCRIPT' }?page=export",
+                                   "session_id=$cookie->{ 'SESSION_ID' }",
+                                   "user=$cookie->{ 'USER' }",
+                                   "clade=$cookie->{ 'CLADE' }",
+                                   "genome=$cookie->{ 'GENOME' }",
+                                   "assembly=$cookie->{ 'ASSEMBLY' }",
+                                   "contig=$cookie->{ 'CONTIG' }",
+                                   "s_beg=$cookie->{ 'S_BEG' }",
+                                   "s_end=$cookie->{ 'S_END' }",
+                                   "strand=$cookie->{ 'STRAND' }",
+                ),
+            );
 
             push @html, Maasha::XHTML::table_row_advanced(
                 tr => [ { td => $result->{ 'S_ID' } },
@@ -1013,3 +1572,7 @@ sub section_dna
 
 
 __END__
+
+
+    # my $t0 = Time::HiRes::gettimeofday();
+    # my $t1 = Time::HiRes::gettimeofday(); print STDERR "Time: " . ( $t1 - $t0 ) . "\n";