JamView.java

    addMouseListener(new PopupListener());
    setFocusable(true);
    requestFocusInWindow();
    addFocusListener(new FocusListener()
    {
      public void focusGained(FocusEvent fe){}
      public void focusLost(FocusEvent fe){}
    });
  }
  
  /**
   * Check to see if this component is contained by the display
   * (FeatureDisplay) component.
   * @return
   */
  private boolean containsComponent(JPanel topPanel, JPanel mainPanel)
  {
    Component[] c = mainPanel.getComponents();
    for(int i=0; i<c.length; i++)
    {
      if(c[i].equals(topPanel))
        return true;
    }
    
    return false;
  }
  
  public void setVisible(boolean visible)
  {
    super.setVisible(visible);
    mainPanel.setVisible(visible);
  }
  
  private int getBaseAtStartOfView()
  {
    String refName = (String) combo.getSelectedItem();
    int seqLength = seqLengths.get(refName);
    double x = jspView.getViewport().getViewRect().getX();
    return (int) (seqLength * ( x / getWidth()));
  }
  
  /**
   * Set the panel size based on the number of bases visible
   * and repaint.
   * @param nbasesInView
   */
  private void setZoomLevel(final int nbasesInView)
  {
    this.nbasesInView = nbasesInView;
    int start = getBaseAtStartOfView();
    setDisplay(start,start+nbasesInView, null);
    revalidate();
    repaint();
  }
  
  /**
   * Set the ViewPort so it starts at the given base position.
   * @param base
   */
  private void goToBasePosition(int base)
  {
    Point p = jspView.getViewport().getViewPosition();
    String refName = (String) combo.getSelectedItem();
    int seqLength = seqLengths.get(refName);
    p.x = (int) ((getPreferredSize().width)*(((float)base-1)/(float)seqLength));
    jspView.getViewport().setViewPosition(p);
  }
  
  /**
   * 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;
    
    String refName = (String) combo.getSelectedItem();
    int seqLength = seqLengths.get(refName);

    double pixPerBase = getPixPerBase(start, end);
    if(pixPerBase*2 > ALIGNMENT_PIX_PER_BASE)
    {
      pixPerBase = ALIGNMENT_PIX_PER_BASE;
      checkBoxSingle.setVisible(false);
      jspView.getVerticalScrollBar().setValue(0);
      jspView.setColumnHeaderView(ruler);
      showBaseAlignment = true;
    }
    else if(jspView != null)
    {
      checkBoxSingle.setVisible(true);
      jspView.setColumnHeaderView(null);
      showBaseAlignment = false;
    }
    
    Dimension d = new Dimension();
    d.setSize((seqLength*pixPerBase), 800.d);
    setPreferredSize(d);
    goToBasePosition(startBase);
    
    repaint();
    if(event == null || 
       event.getType() == DisplayAdjustmentEvent.SCALE_ADJUST_EVENT)
      revalidate();
    
    this.startBase = -1;
    this.endBase   = -1;
  }
  
  private double getPixPerBase(int start, int end)
  {
    if(feature_display == null)
      return 1000.d/(double)(end-start+1);
    else
      return feature_display.getWidth()/(double)(end-start+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 showScale;
  }

  public void setShowScale(boolean showScale)
  {
    this.showScale = showScale;
  }
  
  public JScrollPane getJspView()
  {
    return jspView;
  }
  
  public void setBases(Bases bases)
  {
    this.bases = bases;
  }
  
  /**
   * Remove JScrollPane border
   */
  public void removeBorder()
  {
    Border empty = new EmptyBorder(0,0,0,0);
    jspView.setBorder(empty);
  }
  
  /**
   *  Handle a mouse drag event on the drawing canvas.
   **/
  private void handleCanvasMouseDragOrClick(final MouseEvent event)
  {
    if(!showBaseAlignment || event.isShiftDown()) 
      return;

    String refName = (String) combo.getSelectedItem();
    int seqLength = seqLengths.get(refName);
    float pixPerBase = ((float)getWidth())/(float)(seqLength);    
    int start = (int) Math.round(event.getPoint().getX()/pixPerBase);
    if(start < 1)
      start = 1;
    if(start > seqLength)
      start = seqLength;
    
    MarkerRange drag_range;
    try
    {
      drag_range = new MarkerRange (bases.getForwardStrand(), start, start);
      getSelection().setMarkerRange(drag_range);
      repaint();
    }
    catch (OutOfRangeException e)
    {
      e.printStackTrace();
    }
  }
  
  private Selection getSelection()
  {
    return selection;
  }
  
  private class Ruler extends JPanel
  {
    private static final long serialVersionUID = 1L;
    int start;
    int end;

    public Ruler()
    {
      super();
      setPreferredSize(new Dimension(getPreferredSize().width, 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;

      for(int i=startMark; i<end; i+=10)
      {
        int xpos = (i-1-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
  {
    public void mouseClicked(MouseEvent e)
    {
      JamView.this.requestFocus();
      handleCanvasMouseDragOrClick(e);
    }
    
    public void mousePressed(MouseEvent e)
    {
      maybeShowPopup(e);
    }

    public void mouseReleased(MouseEvent e)
    {
      maybeShowPopup(e);
    }

    private void maybeShowPopup(MouseEvent e)
    {
      if(e.isPopupTrigger())
        popup.show(e.getComponent(),
                e.getX(), e.getY());
    }
  }
 
  
  class SAMRecordComparator implements Comparator<Object>
  {
    public int compare(Object o1, Object o2) 
    {
      SAMRecord pr1 = (SAMRecord) o1;
      SAMRecord pr2 = (SAMRecord) o2;
      
      int cmp = pr1.getReadName().compareTo(pr2.getReadName());
      
      if(cmp == 0)
      {
        if(pr1.getAlignmentStart() < pr2.getAlignmentStart())
          return -1;
        else
          return 1;
      }
      return cmp;
    }
  }


  public Dimension getPreferredScrollableViewportSize()
  {
    return getPreferredSize();
  }

  public int getScrollableBlockIncrement(Rectangle visibleRect,
      int orientation, int direction)
  {
    if (orientation == SwingConstants.HORIZONTAL)
      return visibleRect.width - maxUnitIncrement;
    else 
      return visibleRect.height - maxUnitIncrement;
  }

  public boolean getScrollableTracksViewportHeight()
  {
    return false;
  }

  public boolean getScrollableTracksViewportWidth()
  {
    return false;
  }

  public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation,
                                        int direction)
  {
  //Get the current position.
    int currentPosition = 0;
    if (orientation == SwingConstants.HORIZONTAL) 
        currentPosition = visibleRect.x;
    else 
        currentPosition = visibleRect.y;

    //Return the number of pixels between currentPosition
    //and the nearest tick mark in the indicated direction.
    if (direction < 0)
    {
      int newPosition = currentPosition -
                        (currentPosition / maxUnitIncrement)
                         * maxUnitIncrement;
      return (newPosition == 0) ? maxUnitIncrement : newPosition;
    } 
    else 
    {
      return ((currentPosition / maxUnitIncrement) + 1)
              * maxUnitIncrement
              - currentPosition;
    }
  }
  
  /**
   * Artemis event notification
   */
  public void displayAdjustmentValueChanged(DisplayAdjustmentEvent event)
  {
    setDisplay(event.getStart(), event.getEnd(), event);
  }
  
  public static void main(String[] args)
  {
    String bam = args[0];
    int nbasesInView = 1000;
    String reference = null;
    
    for(int i=0;i<args.length; i++)
    {
      if(args[i].equals("-a"))
        bam = args[++i];
      else if(args[i].equals("-r"))
        reference = args[++i];
      else if(args[i].equals("-v"))
        nbasesInView = Integer.parseInt(args[++i]);
      else if(args[i].equals("-s"))
        System.setProperty("samtoolDir", args[++i]);
      else if(args[i].startsWith("-h"))
      { 
        System.out.println("-h\t show help");
        
        System.out.println("-a\t BAM/SAM file to display");
        System.out.println("-r\t reference file (optional)");
        System.out.println("-v\t number of bases to display in the view (optional)");
        System.out.println("-s\t samtool directory");

        System.exit(0);
      }
    }

    final JamView view = new JamView(bam, reference, nbasesInView);
    JFrame frame = new JFrame("JAM");
    
    frame.addWindowFocusListener(new WindowFocusListener()
    {
      public void windowGainedFocus(WindowEvent e)
      {
        view.requestFocus();
      }
      public void windowLostFocus(WindowEvent e){}
    });
    
    view.addJamToPanel((JPanel)frame.getContentPane(), false, null);
    frame.pack();

    view.jspView.getVerticalScrollBar().setValue(
        view.jspView.getVerticalScrollBar().getMaximum());
    frame.setVisible(true);
  }

  public void selectionChanged(SelectionChangeEvent event)
  {
    repaint();
  }
}