BamView.java

    menu.add(bamFilesMenu);
    
    final JMenuItem bamSplitter = new JMenuItem("Clone window");
    bamSplitter.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        BamView bamView = new BamView(bamList, null, nbasesInView, 
            feature_display, bases, (JPanel) mainPanel.getParent(), null);
        bamView.getJspView().getVerticalScrollBar().setValue(
            bamView.getJspView().getVerticalScrollBar().getMaximum());

        int start = getBaseAtStartOfView();
        setDisplay(start, nbasesInView+start, null);
        if(feature_display != null)
        {
          feature_display.addDisplayAdjustmentListener(bamView);
          feature_display.getSelection().addSelectionChangeListener(bamView);
        }
      } 
    });
    bamFilesMenu.add(bamSplitter);
    bamFilesMenu.add(new JSeparator());
    
    for(int i=0; i<bamList.size(); i++)
      addToViewMenu(i);
    
    menu.add(new JSeparator());
    
    JMenu viewMenu = new JMenu("Views");
    cbStackView.setFont(viewMenu.getFont());
    cbIsizeStackView.setFont(viewMenu.getFont());
    cbPairedStackView.setFont(viewMenu.getFont());
    cbStrandStackView.setFont(viewMenu.getFont());
    cbCoverageView.setFont(viewMenu.getFont());
    
    baseQualityColour.setFont(viewMenu.getFont());
    colourByCoverageColour.setFont(viewMenu.getFont());
    markInsertions.setFont(viewMenu.getFont());
    
    cbIsizeStackView.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        laststart = -1;
        logMenuItem.setEnabled(isIsizeStackView());
        repaint();
      }
    });
    viewMenu.add(cbIsizeStackView);
    
    
    cbStackView.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        laststart = -1;
        logMenuItem.setEnabled(isIsizeStackView());
        repaint();
      }
    });
    viewMenu.add(cbStackView);
    

    cbPairedStackView.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        laststart = -1;
        logMenuItem.setEnabled(isIsizeStackView());
        repaint();
      }
    });
    viewMenu.add(cbPairedStackView);
    
    cbStrandStackView.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        laststart = -1;
        if(isStrandStackView())
        {
          setViewportMidPoint();
        }
        logMenuItem.setEnabled(isIsizeStackView());
        repaint();
      }
    });
    viewMenu.add(cbStrandStackView);
    
    cbCoverageView.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        laststart = -1;
        logMenuItem.setEnabled(isIsizeStackView());
        repaint();
      }
    });
    viewMenu.add(cbCoverageView);
    
    menu.add(viewMenu);
 
    final JCheckBoxMenuItem checkBoxSNPs = new JCheckBoxMenuItem("SNP marks");
    // 
    JMenu colourMenu = new JMenu("Colour By");
    colourMenu.add(colourByCoverageColour);
    
    baseQualityColour.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        if(baseQualityColour.isSelected())
        {
          checkBoxSNPs.setSelected(false);
          isSNPs = false;
        }
        repaint();
      }
    });
    colourMenu.add(baseQualityColour);
    menu.add(colourMenu);
    
    //
    JMenu showMenu = new JMenu("Show");
    JCheckBoxMenuItem checkBoxOrientation = new JCheckBoxMenuItem("Orientation");
    checkBoxOrientation.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        isOrientation = !isOrientation;
        repaint();
      }
    });
    showMenu.add(checkBoxOrientation);
    
    JCheckBoxMenuItem checkBoxSingle = new JCheckBoxMenuItem("Single Reads");
    checkBoxSingle.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        repaint();
        isSingle = !isSingle;
      }
    });
    showMenu.add(checkBoxSingle);
    
    checkBoxSNPs.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        if (isSNPs && bases == null)
        {
          JOptionPane.showMessageDialog(null,
              "No reference sequence supplied to identify SNPs.", "SNPs",
              JOptionPane.INFORMATION_MESSAGE);
        }
        isSNPs = !isSNPs;
        
        if(isSNPs)
          baseQualityColour.setSelected(false);
        repaint();
      }
    });
    showMenu.add(checkBoxSNPs);
    
    markInsertions.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        repaint();
      }
    });
    showMenu.add(markInsertions);
    menu.add(showMenu);
    
    //
    JMenu graphMenu = new JMenu("Graph");
    JCheckBoxMenuItem checkBoxCoverage = new JCheckBoxMenuItem("Coverage");
    checkBoxCoverage.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        isCoverage = !isCoverage;
        coveragePanel.setVisible(isCoverage);
        
        if(isCoverage && !cbCoverageView.isSelected())
          laststart = -1;
        repaint();
      }
    });
    graphMenu.add(checkBoxCoverage);
    
    JCheckBoxMenuItem checkBoxSNP = new JCheckBoxMenuItem("SNP");
    checkBoxSNP.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        isSNPplot = !isSNPplot;
        snpPanel.setVisible(isSNPplot);
        laststart = -1;
        repaint();
      }
    });
    graphMenu.add(checkBoxSNP);
    menu.add(graphMenu);
    
    
    if(feature_display != null)
    {
      final JCheckBoxMenuItem checkBoxSync =
        new JCheckBoxMenuItem("Asynchronous", asynchronous);
      checkBoxSync.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          asynchronous = checkBoxSync.isSelected();
        }
      });
      menu.add(checkBoxSync);
    }
    
    menu.add(new JSeparator());

    JMenu maxHeightMenu = new JMenu("BamView Height");
    menu.add(maxHeightMenu);
    
    final String hgts[] =
       {"500", "800", "1000", "1500", "2500", "5000", "50000"};
    
    ButtonGroup bgroup = new ButtonGroup();
    for(int i=0; i<hgts.length; i++)
    {
      final String hgt = hgts[i];
      final JCheckBoxMenuItem maxHeightMenuItem = new JCheckBoxMenuItem(hgt);
      bgroup.add(maxHeightMenuItem);
      maxHeightMenuItem.setSelected(hgts[i].equals(Integer.toString(maxHeight)));
      maxHeightMenu.add(maxHeightMenuItem);
      maxHeightMenuItem.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          if(maxHeightMenuItem.isSelected())
            maxHeight = Integer.parseInt(hgt);
          int start = getBaseAtStartOfView();
          setDisplay(start, nbasesInView+start, null);
        }
      });
    }
    
    menu.add(new JSeparator());
    logMenuItem.setFont(menu.getFont());
    menu.add(logMenuItem);
    logMenuItem.setEnabled(isIsizeStackView());
    
    logMenuItem.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        logScale = logMenuItem.isSelected();
        repaint();
      }
    });
    
    JMenuItem filter = new JMenuItem("Filter by Flag...");
    menu.add(filter);
    filter.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        new SAMRecordFilter(BamView.this);
      } 
    });

    //
    JMenu coverageMenu = new JMenu("Coverage Options");
    coverageView.init(this, 0.f, 0, 0);
    coverageView.createMenus(coverageMenu);
    viewMenu.add(new JSeparator());
    viewMenu.add(coverageMenu);
  }
  
  private JComponent bamTopPanel(final JFrame frame)
  {
    final JComponent topPanel;
    if(frame == null)
    {
      if(feature_display != null)
        this.selection = feature_display.getSelection();
      topPanel = new JPanel(new FlowLayout(FlowLayout.LEADING, 0, 0));
    }
    else
    { 
      topPanel = new JMenuBar();
      frame.setJMenuBar((JMenuBar)topPanel);
      
      JMenu fileMenu = new JMenu("File");
      topPanel.add(fileMenu);

      JMenuItem readBam = new JMenuItem("Open new BamView ...");
      fileMenu.add(readBam);
      readBam.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          String[] s = new String[0];
          BamView.main(s);
        } 
      });
      
      JMenuItem close = new JMenuItem("Close");
      fileMenu.add(close);
      close.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          BamView.this.setVisible(false);
          Component comp = BamView.this;
          
          while( !(comp instanceof JFrame) )
            comp = comp.getParent();
          ((JFrame)comp).dispose();
        } 
      });
      
      JMenuItem exit = new JMenuItem("Exit");
      fileMenu.add(new JSeparator());
      fileMenu.add(exit);
      exit.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          int status = JOptionPane.showConfirmDialog(BamView.this, 
              "Exit BamView?", "Exit", 
              JOptionPane.OK_CANCEL_OPTION);
          if(status != JOptionPane.OK_OPTION)
            return;
          System.exit(0);
        } 
      });
      
      addKeyListener(new KeyAdapter()
      {
        public void keyPressed(final KeyEvent event)
        {
          switch (event.getKeyCode())
          {
            case KeyEvent.VK_UP:
              setZoomLevel((int) (BamView.this.nbasesInView * 1.1));
              break;
            case KeyEvent.VK_DOWN:
              if (showBaseAlignment)
                break;
              setZoomLevel((int) (BamView.this.nbasesInView * .9));
              break;
            default:
              break;
          }
        }
      });
    }
    
    if(seqNames.size() > 1)
    {
      int len = 0;
      for(int i=0; i<seqNames.size(); i++)
        len += seqLengths.get(seqNames.get(i));
      
      if(feature_display != null &&
         len == feature_display.getSequenceLength())
        concatSequences = true;
      else if(bases != null &&
          len == bases.getLength() )
        concatSequences = true;
    }

    // auto hide top panel
    final JCheckBox buttonAutoHide = new JCheckBox("Hide", (frame == null));
    buttonAutoHide.setToolTipText("Auto-Hide");
    final MouseMotionListener mouseMotionListener = new MouseMotionListener()
    {
      public void mouseDragged(MouseEvent event)
      {
        handleCanvasMouseDrag(event);
      }
      
      public void mouseMoved(MouseEvent e)
      {
        lastMousePoint = e.getPoint();
        
        int thisHgt = HEIGHT;
        if (thisHgt < 5)
          thisHgt = 15;

        int y = (int) (e.getY() - jspView.getViewport().getViewRect().getY());
        if (y < thisHgt)
        {
          topPanel.setVisible(true);
        }
        else
        {
          if (buttonAutoHide.isSelected())
            topPanel.setVisible(false);
        }
        mainPanel.repaint();
        mainPanel.revalidate();
      }
    };
    addMouseMotionListener(mouseMotionListener);

    combo = new JComboBox(seqNames);
    combo.setEditable(false);
    combo.setMaximumRowCount(20);
    
    combo.addItemListener(new ItemListener()
    {
      public void itemStateChanged(ItemEvent e)
      {
        laststart = -1;
        if(feature_display != null)
          setZoomLevel(feature_display.getMaxVisibleBases());
        else
          setZoomLevel(BamView.this.nbasesInView);
      }
    });
    topPanel.add(combo);

    if(feature_display == null)
    {
      final JTextField baseText = new JTextField(8);
      JButton goTo = new JButton("GoTo:");
      goTo.setToolTipText("Go to base position");
      goTo.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          try
          {
            int basePosition = Integer.parseInt(baseText.getText());
            scrollBar.setValue(basePosition);
          }
          catch (NumberFormatException nfe)
          {
            JOptionPane.showMessageDialog(BamView.this,
                "Expecting a base number!", "Number Format",
                JOptionPane.WARNING_MESSAGE);
          }
        }
      });
      topPanel.add(goTo);
      topPanel.add(baseText);

      JButton zoomIn = new JButton("-");
      Insets ins = new Insets(1,1,1,1);
      zoomIn.setMargin(ins);
      zoomIn.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          setZoomLevel((int) (BamView.this.nbasesInView * 1.1));
        }
      });
      topPanel.add(zoomIn);

      JButton zoomOut = new JButton("+");
      zoomOut.setMargin(ins);
      zoomOut.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          if (showBaseAlignment)
            return;
          setZoomLevel((int) (BamView.this.nbasesInView * .9));
        }
      });
      topPanel.add(zoomOut);
    }
    
    topPanel.add(buttonAutoHide);
    return topPanel;
  }
  
  public void setVisible(boolean visible)
  {
    super.setVisible(visible);
    mainPanel.setVisible(visible);
  }
  
  private void setViewportMidPoint()
  {
    Point p = jspView.getViewport().getLocation();
    p.y = (getHeight() - jspView.getViewport().getViewRect().height)/2;
    jspView.getViewport().setViewPosition(p);
  }
  
  protected int getBaseAtStartOfView()
  {
    if(feature_display != null)
      return feature_display.getForwardBaseAtLeftEdge();
    else
      return scrollBar.getValue();
  }
  
  /**
   * Set the panel size based on the number of bases visible
   * and repaint.
   * @param nbasesInView
   */
  private void setZoomLevel(final int nbasesInView)
  {
    int startValue = getBaseAtStartOfView();
    this.nbasesInView = nbasesInView;
    float pixPerBase = getPixPerBaseByWidth(); 

    if(isBaseAlignmentView(pixPerBase))
    {
      pixPerBase = ALIGNMENT_PIX_PER_BASE;
      this.nbasesInView = (int)(mainPanel.getWidth()/pixPerBase);
      jspView.getVerticalScrollBar().setValue(0);
      
      if(ruler == null)
        ruler = new Ruler();
      jspView.setColumnHeaderView(ruler);
      showBaseAlignment = true;
      baseQualityColour.setEnabled(true);
      markInsertions.setEnabled(true);
    }
    else if(jspView != null)
    {
      if(!cbCoverageView.isSelected() && nbasesInView >= MAX_BASES)
      {
        cbLastSelected = getSelectedCheckBoxMenuItem();
        cbCoverageView.setSelected(true);
      }
      else if(cbCoverageView.isSelected() && nbasesInView < MAX_BASES && cbLastSelected != null)
      {
        cbLastSelected.setSelected(true);
        cbLastSelected = null;
      }
      
      jspView.setColumnHeaderView(null);
      
      if(!isStrandStackView())
        jspView.getVerticalScrollBar().setValue(
            jspView.getVerticalScrollBar().getMaximum());
      showBaseAlignment = false;
      baseQualityColour.setEnabled(false);
      markInsertions.setEnabled(false);
    }
    
    if(scrollBar != null)
    {
      scrollBar.setValues(startValue, nbasesInView, 1, 
             getMaxBasesInPanel(getSequenceLength()));
      scrollBar.setUnitIncrement(nbasesInView/20);
      scrollBar.setBlockIncrement(nbasesInView);
    }
  }

  
  /**
   * Set the start and end base positions to display.
   * @param start
   * @param end
   * @param event
   */
  public void setDisplay(int start,
                         int end,
                         DisplayAdjustmentEvent event)
  {
    this.startBase = start;
    this.endBase   = end;
    this.nbasesInView = end-start+1;
    lastMousePoint = null;

    float pixPerBase;
    if(jspView.getViewport().getViewRect().width > 0)
      pixPerBase = getPixPerBaseByWidth();
    else
    {
      if(feature_display == null)
        pixPerBase = 1000.f/(float)(end-start+1);
      else
        pixPerBase = feature_display.getWidth()/(float)(end-start+1);
    }
    
    Dimension d = new Dimension();
    d.setSize(nbasesInView*pixPerBase, maxHeight);
    setPreferredSize(d);
    
    if(event == null)
    {
      this.startBase = -1;
      this.endBase   = -1;
    }
  }
  
  /**
   * Return an Artemis entry from a file 
   * @param entryFileName
   * @param entryGroup
   * @return
   * @throws NoSequenceException
   */
  private Entry getEntry(final String entryFileName, final EntryGroup entryGroup) 
                   throws NoSequenceException
  {
    final Document entry_document = DocumentFactory.makeDocument(entryFileName);
    final EntryInformation artemis_entry_information =
      Options.getArtemisEntryInformation();
    
    //System.out.println(entryFileName);
    final uk.ac.sanger.artemis.io.Entry new_embl_entry =
      EntryFileDialog.getEntryFromFile(null, entry_document,
                                       artemis_entry_information,
                                       false);

    if(new_embl_entry == null)  // the read failed
      return null;

    Entry entry = null;
    try
    {
      if(entryGroup.getSequenceEntry() != null)
        bases = entryGroup.getSequenceEntry().getBases();
      
      if(bases == null)
      {
        entry = new Entry(new_embl_entry);
        bases = entry.getBases();
      }
      else
        entry = new Entry(bases,new_embl_entry);
      
      entryGroup.add(entry);
    } 
    catch(OutOfRangeException e) 
    {
      new MessageDialog(null, "read failed: one of the features in " +
          entryFileName + " has an out of range " +
                        "location: " + e.getMessage());
    }
    return entry;
  }
  
  private boolean isShowScale()
  {
    return (feature_display == null ? true : false);
  }

  public JScrollPane getJspView()
  {
    return jspView;
  }
  
  /**
   *  Handle a mouse drag event on the drawing canvas.
   **/
  private void handleCanvasMouseDrag(final MouseEvent event)
  {
    if(event.getButton() == MouseEvent.BUTTON3 || bases == null) 
      return;
    
    highlightSAMRecord = null;
    if(event.getClickCount() > 1)
    {
      getSelection().clear();
      repaint();
      return;  
    }
    
    highlightRange(event, 
        MouseEvent.BUTTON1_DOWN_MASK & MouseEvent.BUTTON2_DOWN_MASK);
  }
  
  /**
   * 
   * @param event
   * @param onmask
   */
  private void highlightRange(MouseEvent event, int onmask)
  {
    int seqLength = getSequenceLength();
    float pixPerBase = getPixPerBaseByWidth();
    int start = (int) ( ( (event.getPoint().getX())/pixPerBase) + getBaseAtStartOfView() );
    
    if(start < 1)
      start = 1;
    if(start > seqLength)
      start = seqLength;
    
    if (dragStart < 0 && (event.getModifiersEx() & onmask) == onmask)
      dragStart = start;
    else if((event.getModifiersEx() & onmask) != onmask)
      dragStart = -1;
    
    MarkerRange drag_range;
    try
    {
      if(dragStart < 0)
        drag_range = new MarkerRange (bases.getForwardStrand(), start, start);
      else
        drag_range = new MarkerRange (bases.getForwardStrand(), dragStart, start);
      getSelection().setMarkerRange(drag_range);
      repaint();
    }
    catch (OutOfRangeException e)
    {
      e.printStackTrace();
    }
  }
  
  /**
   * Get the colour for the given read given to it by the coverage plot.
   * @param samRecord
   * @return
   */
  private Color getColourByCoverageColour(SAMRecord samRecord)
  {
    LineAttributes lines[] = CoveragePanel.getLineAttributes(bamList.size());
    int fileIndex = 0;
    if(bamList.size()>1)
      fileIndex = (Integer) samRecord.getAttribute("FL");
    return lines[fileIndex].getLineColour(); 
  }

  protected int getMaxBases()
  {
    return MAX_BASES;
  }
  
  protected void setMaxBases(int max)
  {
    MAX_BASES = max;
  }
  
  private boolean isStackView()
  {
    return cbStackView.isSelected();  
  }
  
  private boolean isPairedStackView()
  {
    return cbPairedStackView.isSelected();
  }
  
  private boolean isStrandStackView()
  {
    return cbStrandStackView.isSelected();
  }
  
  private boolean isCoverageView(float pixPerBase)
  {
    if(isBaseAlignmentView(pixPerBase))
      return false;
    return cbCoverageView.isSelected();
  }
  
  private boolean isIsizeStackView()
  {
    return cbIsizeStackView.isSelected();
  }
  
  private boolean isBaseAlignmentView(float pixPerBase)
  {
    if(pixPerBase*1.08f >= ALIGNMENT_PIX_PER_BASE)
      return true;
    return false;
  }
  
  private JCheckBoxMenuItem getSelectedCheckBoxMenuItem()
  {
    if(isStackView())
      return cbStackView;
    if(isPairedStackView())
      return cbPairedStackView;
    if(isStrandStackView())
      return cbStrandStackView;
    if(isIsizeStackView())
      return cbIsizeStackView;
    return cbCoverageView;
  }
  
  private Selection getSelection()
  {
    return selection;
  }
  
  protected List<SAMRecord> getReadsInView()
  {
    return readsInView;
  }
  
  protected int getBasesInView()
  {
    return nbasesInView;
  }
  
  private String getVersion()
  {
    final ClassLoader cl = this.getClass().getClassLoader();
    try
    {
      String line;
      InputStream in = cl.getResourceAsStream("etc/versions");
      BufferedReader reader = new BufferedReader(new InputStreamReader(in));
      while((line = reader.readLine()) != null)
      {
        if(line.startsWith("BamView"))
          return line.substring( "BamView".length() ).trim();
      }
      reader.close();
      in.close();
    }
    catch (Exception ex)
    {
    }
    return null;
  }
  
  /**
   * Artemis event notification
   */
  public void displayAdjustmentValueChanged(final DisplayAdjustmentEvent event)
  {
    if(event.getType() == DisplayAdjustmentEvent.REV_COMP_EVENT &&
       event.isRevCompDisplay())
      JOptionPane.showMessageDialog(this, 
          "Flipping the display is not supported by BamView.", "Warning", 
          JOptionPane.WARNING_MESSAGE);

    if(!asynchronous)
    {
      // if not asynchronous
      displayAdjustmentWork(event);
      return;
    }
    
    SwingWorker worker = new SwingWorker()
    {
      public Object construct()
      {
        try
        {
          Thread.sleep(500);
        }
        catch (InterruptedException e)
        {
          e.printStackTrace();
        }
        
        if(event.getStart() != ((FeatureDisplay)event.getSource()).getForwardBaseAtLeftEdge())
        {
          waitingFrame.showWaiting("waiting...", mainPanel);
          return null;
        }
      
        displayAdjustmentWork(event);
        waitingFrame.setVisible(false);
        return null;
      }
    };
    worker.start();
  }
  
  /**
   * Carry out the display agjustment event action.
   * @param event
   */
  private void displayAdjustmentWork(final DisplayAdjustmentEvent event)
  {
    if(event.getType() == DisplayAdjustmentEvent.SCALE_ADJUST_EVENT)
    {
      laststart = -1;

      BamView.this.startBase = event.getStart();
      BamView.this.endBase   = event.getEnd();

      int width = feature_display.getMaxVisibleBases();
      setZoomLevel(width);
      repaint();
    }
    else
    {
      setDisplay(event.getStart(), 
        event.getStart()+feature_display.getMaxVisibleBases(), event);
      repaint();
    }
  }
  
  public void selectionChanged(SelectionChangeEvent event)
  {
    repaint();
  }
  
  private class Ruler extends JPanel
  {
    private static final long serialVersionUID = 1L;
    int start;
    int end;

    public Ruler()
    {
      super();
      setPreferredSize(new Dimension(mainPanel.getWidth(), 15));
      setBackground(Color.white);
      setFont(getFont().deriveFont(11.f));
    }

    public void paintComponent(Graphics g)
    {
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D)g;
      drawBaseScale(g2, start, end, 12);
    }

    private void drawBaseScale(Graphics2D g2, int start, int end, int ypos)
    {
      int startMark = (((int)(start/10))*10)+1;

      if(end > getSequenceLength())
        end = getSequenceLength();
      
      for(int i=startMark; i<end; i+=10)
      {
        int xpos = (i-start)*ALIGNMENT_PIX_PER_BASE;
        g2.drawString(Integer.toString(i), xpos, ypos);
        
        xpos+=(ALIGNMENT_PIX_PER_BASE/2);
        g2.drawLine(xpos, ypos+1, xpos, ypos+5);
      }
    }
  }
  
  /**
  * Popup menu listener
  */
  class PopupListener extends MouseAdapter
  {
	JMenuItem gotoMateMenuItem;
	JMenuItem showDetails;
	
    public void mouseClicked(MouseEvent e)
    {
      if(e.isPopupTrigger() ||
         e.getButton() == MouseEvent.BUTTON3)
        return;
      
      BamView.this.requestFocus();
      
      if(e.getClickCount() > 1)
        getSelection().clear(); 
      else if(e.getButton() == MouseEvent.BUTTON1)
        highlightSAMRecord = mouseOverSAMRecord;
      else
        highlightRange(e, MouseEvent.BUTTON2_DOWN_MASK);
      repaint();
    }
    
    public void mousePressed(MouseEvent e)
    {
      maybeShowPopup(e);
    }

    public void mouseReleased(MouseEvent e)
    {
      dragStart = -1;
      maybeShowPopup(e);
    }

    private void maybeShowPopup(MouseEvent e)
    {
      if(e.isPopupTrigger())
      {
        if(popup == null)
        {
          popup = new JPopupMenu();
          createMenus(popup);
        }
        
        if(gotoMateMenuItem != null)
          popup.remove(gotoMateMenuItem);

        if(showDetails != null)
          popup.remove(showDetails);
        
        if( mouseOverSAMRecord != null && 
            mouseOverSAMRecord.getReadPairedFlag() &&
           !mouseOverSAMRecord.getMateUnmappedFlag() )
        {
          final SAMRecord thisSAMRecord = mouseOverSAMRecord;
          gotoMateMenuItem = new JMenuItem("Go to mate of : "+
              thisSAMRecord.getReadName());
          gotoMateMenuItem.addActionListener(new ActionListener()
          {
			public void actionPerformed(ActionEvent e) 
			{
			  String name = thisSAMRecord.getMateReferenceName();
			  if(name.equals("="))
			    name = thisSAMRecord.getReferenceName();