BamView.java

/* JamView
 *
 * created: 2009
 *
 * This file is part of Artemis
 *
 * Copyright(C) 2009  Genome Research Limited
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or(at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */
package uk.ac.sanger.artemis.components.alignment;

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Stroke;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
import java.io.File;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.List;
import java.util.Vector;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JSeparator;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;

import net.sf.samtools.AlignmentBlock;
import net.sf.samtools.SAMFileHeader;
import net.sf.samtools.SAMFileReader;
import net.sf.samtools.SAMRecord;
import net.sf.samtools.SAMSequenceRecord;
import net.sf.samtools.SAMFileReader.ValidationStringency;
import net.sf.samtools.util.CloseableIterator;

import uk.ac.sanger.artemis.Entry;
import uk.ac.sanger.artemis.EntryGroup;
import uk.ac.sanger.artemis.Options;
import uk.ac.sanger.artemis.Selection;
import uk.ac.sanger.artemis.SelectionChangeEvent;
import uk.ac.sanger.artemis.SelectionChangeListener;
import uk.ac.sanger.artemis.SimpleEntryGroup;
import uk.ac.sanger.artemis.components.DisplayAdjustmentEvent;
import uk.ac.sanger.artemis.components.DisplayAdjustmentListener;
import uk.ac.sanger.artemis.components.EntryFileDialog;
import uk.ac.sanger.artemis.components.FeatureDisplay;
import uk.ac.sanger.artemis.components.MessageDialog;
import uk.ac.sanger.artemis.components.SwingWorker;
import uk.ac.sanger.artemis.components.Utilities;
import uk.ac.sanger.artemis.editor.MultiLineToolTipUI;
import uk.ac.sanger.artemis.io.EntryInformation;
import uk.ac.sanger.artemis.io.Range;
import uk.ac.sanger.artemis.sequence.Bases;
import uk.ac.sanger.artemis.sequence.MarkerRange;
import uk.ac.sanger.artemis.sequence.NoSequenceException;
import uk.ac.sanger.artemis.util.Document;
import uk.ac.sanger.artemis.util.DocumentFactory;
import uk.ac.sanger.artemis.util.OutOfRangeException;

public class BamView extends JPanel
                     implements DisplayAdjustmentListener, SelectionChangeListener
{
  private static final long serialVersionUID = 1L;
  private List<SAMRecord> readsInView;
  private Hashtable<String, Integer> seqLengths = new Hashtable<String, Integer>();
  private Hashtable<String, Integer> offsetLengths;
  private Vector<String> seqNames = new Vector<String>();
  private String bam;

  private Bases bases;
  private JScrollPane jspView;
  private JScrollBar scrollBar;
  
  private JComboBox combo;
  private boolean isSingle = false;
  private boolean isSNPs = false;
  private boolean isStackView = false;
  private boolean isPairedStackView = false;
  private boolean isStrandStackView = false;
  private boolean isCoverage = false;
  
  private FeatureDisplay feature_display;
  private Selection selection;
  private JPanel mainPanel;
  private CoveragePanel coveragePanel;
  private boolean showScale = true;
  private Ruler ruler;
  private int nbasesInView;
  
  private int startBase = -1;
  private int endBase   = -1;
  private int laststart;
  private int lastend;
  private int maxUnitIncrement = 8;
  private Cursor cbusy = new Cursor(Cursor.WAIT_CURSOR);
  private Cursor cdone = new Cursor(Cursor.DEFAULT_CURSOR);
  
  private boolean asynchronous = true;
  private boolean showBaseAlignment = false;
  private JCheckBoxMenuItem checkBoxStackView = new JCheckBoxMenuItem("Stack View");
  
  private AlphaComposite translucent = 
    AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.6f);
  
  /** Used to colour the frames. */
  private Color lightGrey = new Color(200, 200, 200);
  private Color darkGreen = new Color(0, 150, 0);
  private Color darkOrange = new Color(255,140,0);
  
  private Point lastMousePoint = null;
  private SAMRecord mouseOverSAMRecord = null;
  private SAMRecord highlightSAMRecord = null;
  // record of where a mouse drag starts
  private int dragStart = -1;
  
  private int maxHeight = 800;
  
  private boolean concatSequences = false;
  private int ALIGNMENT_PIX_PER_BASE;
  private int BASE_HEIGHT;
  
  private JPopupMenu popup;
  private PopupMessageFrame popFrame = new PopupMessageFrame();
  private PopupMessageFrame waitingFrame;
  
  public static org.apache.log4j.Logger logger4j = 
    org.apache.log4j.Logger.getLogger(BamView.class);
  
  public BamView(String bam, 
                 String reference,
                 int nbasesInView)
  {
    super();
    setBackground(Color.white);
    this.bam = bam;
    this.nbasesInView = nbasesInView;
    
    if(reference != null)
    {
      EntryGroup entryGroup = new SimpleEntryGroup();
      try
      {
        getEntry(reference,entryGroup);
      }
      catch (NoSequenceException e)
      {
        e.printStackTrace();
      }
    }
    
    try
    {
      readHeaderPicard();
    }
    catch(java.lang.UnsupportedClassVersionError err)
    {
      JOptionPane.showMessageDialog(null, 
          "This requires Java 1.6 or higher.", 
          "Check Java Version", JOptionPane.WARNING_MESSAGE);
    }
    
    // set font size
    //setFont(getFont().deriveFont(12.f));

    //Options.getOptions().getFontUIResource();
    //final javax.swing.plaf.FontUIResource font_ui_resource =
    //  new javax.swing.plaf.FontUIResource(getFont());
    final javax.swing.plaf.FontUIResource font_ui_resource =
      Options.getOptions().getFontUIResource();
    
    Enumeration<Object> keys = UIManager.getDefaults().keys();
    while(keys.hasMoreElements()) 
    {
      Object key = keys.nextElement();
      Object value = UIManager.get(key);
      if(value instanceof javax.swing.plaf.FontUIResource) 
        UIManager.put(key, font_ui_resource);
    }
    
    setFont(Options.getOptions().getFont());
    FontMetrics fm  = getFontMetrics(getFont());
    ALIGNMENT_PIX_PER_BASE = fm.charWidth('M');
    BASE_HEIGHT = fm.getHeight();
    selection = new Selection(null);
    
    MultiLineToolTipUI.initialize();
    setToolTipText("");
  }
  
  public String getToolTipText()
  {
    return ( mouseOverSAMRecord != null ? 
        mouseOverSAMRecord.getReadName() + "\n" + 
        mouseOverSAMRecord.getAlignmentStart() + ".." +
        mouseOverSAMRecord.getAlignmentEnd() + "\nisize=" +
        mouseOverSAMRecord.getInferredInsertSize() + "\nrname=" +
        mouseOverSAMRecord.getReferenceName(): null);
  }

  /*
  private void readHeader()
  {
    String samtoolCmd = "";
    if(System.getProperty("samtoolDir") != null)
      samtoolCmd = System.getProperty("samtoolDir");
    String cmd[] = { samtoolCmd+File.separator+"samtools",  
			     "view", "-H", bam };
	
    RunSamTools samtools = new RunSamTools(cmd, null, null, null);
	
    if(samtools.getProcessStderr() != null)
      System.out.println(samtools.getProcessStderr());
 
    String header = samtools.getProcessStdout();
    
    StringReader samReader = new StringReader(header);
	BufferedReader buff = new BufferedReader(samReader);
    
	String line;
	try 
	{
	  while((line = buff.readLine()) != null)
	  {
	    if(line.indexOf("LN:") > -1)
	    {
	      String parts[] = line.split("\t");
	      String name = "";
	      int seqLength = 0;
	      for(int i=0; i<parts.length; i++)
	      {
	        if(parts[i].startsWith("LN:"))
	          seqLength = Integer.parseInt( parts[i].substring(3) );
	        else if(parts[i].startsWith("SN:"))
	          name = parts[i].substring(3);
	      }
	      seqLengths.put(name, seqLength);
	      seqNames.add(name);
	    }
	  }
	} 
	catch (IOException e) 
	{
	  e.printStackTrace();
	}
  }

  private void readFromBam(int start, int end)
  {
    String refName = (String) combo.getSelectedItem();
    
    String samtoolCmd = "";
    if(System.getProperty("samtoolDir") != null)
      samtoolCmd = System.getProperty("samtoolDir");
    
	String cmd[] = { samtoolCmd+File.separator+"samtools",  
				     "view", 
				     bam, refName+":"+start+"-"+end };
		
	for(int i=0; i<cmd.length;i++)
	  System.out.print(cmd[i]+" ");
	System.out.println();
	
    if(readsInView == null)
      readsInView = new Vector<SAMRecord>();
    else
      readsInView.clear();
	RunSamTools samtools = new RunSamTools(cmd, null, null, readsInView);
		
	if(samtools.getProcessStderr() != null)
      System.out.println(samtools.getProcessStderr());
	    
	samtools.waitForStdout();
  }*/
  

  private void readHeaderPicard()
  {
    File bamFile = new File(bam);
    File indexFile = new File(bam+".bai");
    final SAMFileReader inputSam = new SAMFileReader(bamFile, indexFile);
    SAMFileHeader header = inputSam.getFileHeader();
    List<SAMSequenceRecord> readGroups = header.getSequenceDictionary().getSequences();
    
    for(int i=0; i<readGroups.size(); i++)
    {
      seqLengths.put(readGroups.get(i).getSequenceName(),
                     readGroups.get(i).getSequenceLength());
      seqNames.add(readGroups.get(i).getSequenceName());
    }
    inputSam.close();
  }
  
  /**
   * Read a SAM or BAM file.
   */
  private void readFromBamPicard(int start, int end)
  {
    // Open the input file.  Automatically detects whether input is SAM or BAM
    // and delegates to a reader implementation for the appropriate format.
    File bamFile = new File(bam);
    File indexFile = new File(bam+".bai");
    final SAMFileReader inputSam = new SAMFileReader(bamFile, indexFile);
    inputSam.setValidationStringency(ValidationStringency.SILENT);
 
    if(readsInView == null)
      readsInView = new Vector<SAMRecord>();
    else
      readsInView.clear();

    if(concatSequences)
    {
      int len = 0;
      int lastLen = 1;
      for(int i=0; i<seqNames.size(); i++)
      {
        int thisLength = seqLengths.get(seqNames.get(i));
        len += thisLength;

        if( (lastLen >= start && lastLen < end) ||
            (len >= start && len < end) ||
            (start >= lastLen && start < len) ||
            (end >= lastLen && end < len) )
        {
          int offset = getSequenceOffset(seqNames.get(i)); 
          int thisStart = start - offset;
          if(thisStart < 1)
            thisStart = 1;
          int thisEnd   = end - offset;
          if(thisEnd > thisLength)
            thisEnd = thisLength;
          
          //System.out.println("READ "+seqNames.get(i)+"  "+thisStart+".."+thisEnd);
          
          iterateOverBam(inputSam, seqNames.get(i), thisStart, thisEnd);
        }
        lastLen = len;
      }
    }
    else
    {
      String refName = (String) combo.getSelectedItem();
      iterateOverBam(inputSam, refName, start, end);
    }
    
    inputSam.close();
    //System.out.println("readFromBamPicard "+start+".."+end);
  }
  
  /**
   * Iterate over BAM file and load into the <code>List</code> of
   * <code>SAMRecord</code>.
   * @param inputSam
   * @param refName
   * @param start
   * @param end
   */
  private void iterateOverBam(final SAMFileReader inputSam, 
                              String refName, int start, int end)
  { 
    CloseableIterator<SAMRecord> it = inputSam.queryOverlapping(refName, start, end);
    MemoryMXBean memory = ManagementFactory.getMemoryMXBean();
    int checkMemAfter = 8000;
    int cnt = 0;
    
    while ( it.hasNext() )
    {
      try
      {
        cnt++;
        SAMRecord samRecord = it.next();
        readsInView.add(samRecord);
        
        if(cnt > checkMemAfter)
        {
          cnt = 0;
          float heapFraction =
            (float)((float)memory.getHeapMemoryUsage().getUsed()/
                    (float)memory.getHeapMemoryUsage().getMax());
          logger4j.debug("Heap memory usage (used/max): "+heapFraction);
          
          if(heapFraction > 0.97) 
          {
            popFrame.show("Data Read Incomplete",
              "Over 97 % of the maximum memory\nlimit ("+
              (memory.getHeapMemoryUsage().getMax()/1000000.f)+" Mb).\n"+
              "Zoom in or consider increasing the\nmemory for this application.",
              mainPanel.getLocationOnScreen().y,
              20000);
            break;
          }
        }
      }
      catch(Exception e)
      {
        System.out.println(e.getMessage());
      }
    }
    it.close();
  }

  private int getSequenceLength()
  {
    if(concatSequences)
    {
      int len = 0;
      for(int i=0; i<seqNames.size(); i++)
        len += seqLengths.get(seqNames.get(i));
      return len;
    }
    else
      return seqLengths.get((String) combo.getSelectedItem());
  }
  
  /**
   * For BAM files with multiple references sequences, calculate
   * the offset from the start of the concatenated sequence for 
   * a given reference.
   * @param refName
   * @return
   */
  protected int getSequenceOffset(String refName)
  {
    if(!concatSequences)
      return 0;
    
    if(offsetLengths == null)
    {   
      offsetLengths = new Hashtable<String, Integer>(combo.getItemCount());
      int offset = 0;
      for(int i=0; i<combo.getItemCount(); i++)
      {
        String thisSeqName = (String) combo.getItemAt(i);
        offsetLengths.put(thisSeqName, offset);
        offset += seqLengths.get(combo.getItemAt(i));
      }
    }
    return offsetLengths.get(refName);
  }
  
  /**
   * Override
   */
  protected void paintComponent(Graphics g)
  {
	super.paintComponent(g);
	Graphics2D g2 = (Graphics2D)g;

	mouseOverSAMRecord = null;
    int seqLength = getSequenceLength();
	float pixPerBase = getPixPerBaseByWidth();
	
    int start;
    int end;
    
    if(startBase > 0)
      start = startBase;
    else
      start = getBaseAtStartOfView();
    
    if(endBase > 0)
      end = endBase;
    else
    {
      end   = start + nbasesInView - 1;
      if(end > seqLength)
        end = seqLength;
    }
    
    boolean changeToStackView = false;
    MemoryMXBean memory = ManagementFactory.getMemoryMXBean();
    if(laststart != start ||
       lastend   != end)
    {
      setCursor(cbusy);
      synchronized (this)
      {
        try
        {
          float heapFractionUsedBefore = (float) ((float) memory.getHeapMemoryUsage().getUsed() / 
                                                  (float) memory.getHeapMemoryUsage().getMax());
          readFromBamPicard(start, end);
          float heapFractionUsedAfter = (float) ((float) memory.getHeapMemoryUsage().getUsed() / 
                                                 (float) memory.getHeapMemoryUsage().getMax());

          // System.out.println("Heap Max  : "+memory.getHeapMemoryUsage().getMax());
          // System.out.println("Heap Used : "+memory.getHeapMemoryUsage().getUsed());
          // System.out.println("Heap memory used "+heapFractionUsedAfter);

          if ((heapFractionUsedAfter - heapFractionUsedBefore) > 0.06
              && !isStackView && heapFractionUsedAfter > 0.8)
          {
            checkBoxStackView.setSelected(true);
            isStackView = true;
            changeToStackView = true;
          }

          if ((!isStackView && !isStrandStackView)
              || pixPerBase * 1.08f >= ALIGNMENT_PIX_PER_BASE)
          {
            Collections.sort(readsInView, new SAMRecordComparator());
          }

          setCursor(cdone);
        }
        catch (OutOfMemoryError ome)
        {
          JOptionPane.showMessageDialog(this, "Out of Memory");
          readsInView.clear();
          return;
        }
      }
    }
    
    //System.out.println(start+".."+end+" " +
    //    "sequence length = "+getSequenceLength()+
    //    " pixPerBase="+pixPerBase);
    
    laststart = start;
    lastend   = end;
	if(showBaseAlignment)
	  drawBaseAlignment(g2, seqLength, pixPerBase, start, end);
	else
	{
	  if(isStackView)  
	    drawStackView(g2, seqLength, pixPerBase, start, end);
	  else if(isPairedStackView)
	    drawPairedStackView(g2, seqLength, pixPerBase, start, end);
	  else if(isStrandStackView)
	    drawStrandStackView(g2, seqLength, pixPerBase, start, end);
	  else
	    drawLineView(g2, seqLength, pixPerBase, start, end);
	  if(isCoverage)
	  {
	    coveragePanel.setStartAndEnd(start, end);
	    coveragePanel.setPixPerBase(pixPerBase);
	    coveragePanel.repaint();
	  }
	}
	
	if(changeToStackView)
	{
	  popFrame.show("Stack View",
          "Note :: Changed to the stack view to save memory.\n"+
          "Currently this is using "+ 
          (memory.getHeapMemoryUsage().getUsed()/1000000.f)+" Mb "+
          "and the maximum\nmemory limit is "+
          (memory.getHeapMemoryUsage().getMax()/1000000.f)+" Mb.",
          mainPanel.getLocationOnScreen().y,
          20000);
	}
  }
  
  
  private float getPixPerBaseByWidth()
  {
    return (float)mainPanel.getWidth() / (float)nbasesInView;
  }
  
  
  private int getMaxBasesInPanel(int seqLength)
  {
    if(feature_display == null)
      return seqLength+nbasesInView/3;
    else
      return seqLength+nbasesInView;
  }
  
  /**
   * Draw the zoomed-in base view.
   * @param g2
   * @param seqLength
   * @param pixPerBase
   * @param start
   * @param end
   */
  private void drawBaseAlignment(Graphics2D g2, 
                                 int seqLength, 
                                 float pixPerBase, 
                                 final int start, 
                                 int end)
  {
    ruler.start = start;
    ruler.end = end;
    ruler.repaint();
    
    int ypos = 0;

    String refSeq = null;
    int refSeqStart = start;
    
    end = start + ( mainPanel.getWidth() * ALIGNMENT_PIX_PER_BASE );
    if(bases != null)
    {
      // draw the reference sequence
      ypos+=11;

      try
      {
        int seqEnd = end+2;
        if(seqEnd > bases.getLength())
          seqEnd = bases.getLength();

        if(refSeqStart < 1)
          refSeqStart = 1;
        refSeq = 
          bases.getSubSequence(new Range(refSeqStart, seqEnd), Bases.FORWARD).toUpperCase();
        
        g2.setColor(lightGrey);
        g2.fillRect(0, ypos-11, mainPanel.getWidth(), 11);
        drawSelectionRange(g2, ALIGNMENT_PIX_PER_BASE, start, end);
        g2.setColor(Color.black);
        g2.drawString(refSeq, 0, ypos);
      }
      catch (OutOfRangeException e)
      {
        e.printStackTrace();
      }
    }
    else
      drawSelectionRange(g2, ALIGNMENT_PIX_PER_BASE, start, end);

    
    boolean drawn[] = new boolean[readsInView.size()];
    for(int i=0; i<readsInView.size(); i++)
      drawn[i] = false;
    
    Rectangle r = jspView.getViewport().getViewRect();
    int nreads = readsInView.size();
    
    for(int i=0; i<nreads; i++)
    {
      if (!drawn[i])
      {
        ypos+=11;
        
        SAMRecord thisRead = readsInView.get(i);
        if(ypos < r.getMaxY() || ypos > r.getMinY())
          drawSequence(g2, thisRead, ypos, refSeq, refSeqStart);
        drawn[i] = true;
        
        int thisEnd = thisRead.getAlignmentEnd();
        if(thisEnd == 0)
          thisEnd = thisRead.getAlignmentStart()+thisRead.getReadLength();
        
        for(int j=i+1; j<nreads; j++)
        {
          if (!drawn[j])
          {
            SAMRecord nextRead = readsInView.get(j);
            int nextStart = nextRead.getAlignmentStart();
            if(nextStart > thisEnd+1)
            {
              if(ypos < r.getMaxY() || ypos > r.getMinY())
                drawSequence(g2, nextRead, ypos, refSeq, refSeqStart);
              
              drawn[j] = true;
              thisEnd = nextRead.getAlignmentEnd();
              if(thisEnd == 0)
                thisEnd = nextStart+nextRead.getReadLength();
            }
            else if(ypos > r.getMaxY() || ypos < r.getMinY())
              break;
          }
        }
      }
    }
    
    if(ypos > getHeight())
    {
      Dimension d = getPreferredSize();
      d.setSize(getPreferredSize().getWidth(), ypos);
      setPreferredSize(d);
      revalidate();
    }
  }

  
  /**
   * Draw the query sequence
   * @param g2
   * @param read
   * @param pixPerBase
   * @param ypos
   */
  private void drawSequence(Graphics2D g2, SAMRecord samRecord, 
                            int ypos, String refSeq, int refSeqStart)
  {
    if (!samRecord.getReadPairedFlag() ||  // read is not paired in sequencing
        samRecord.getMateUnmappedFlag() )  // mate is unmapped )  // mate is unmapped 
      g2.setColor(Color.black);
    else
      g2.setColor(Color.blue);
    
    Color col = g2.getColor();
    int xpos;
    int len = 0;
    String readSeq = samRecord.getReadString();
    int offset = getSequenceOffset(samRecord.getReferenceName());
    
    List<AlignmentBlock> blocks = samRecord.getAlignmentBlocks();
    for(int i=0; i<blocks.size(); i++)
    {
      AlignmentBlock block = blocks.get(i);
      len += block.getLength();
      for(int j=0; j<block.getLength(); j++)
      {
        int readPos = block.getReadStart()-1+j;
        xpos  = block.getReferenceStart()-1+j+offset;
        int refPos = xpos-refSeqStart+1;
        
        if(isSNPs && refSeq != null && refPos > 0 && refPos < refSeq.length())
        { 
          if(readSeq.charAt(readPos) != refSeq.charAt(refPos))
            g2.setColor(Color.red);
          else
            g2.setColor(col);
        }
        
        g2.drawString(readSeq.substring(readPos, readPos+1), 
                      refPos*ALIGNMENT_PIX_PER_BASE, ypos);
      }
    }
    
    // highlight
    if(highlightSAMRecord != null &&
       highlightSAMRecord.getReadName().equals(samRecord.getReadName()))
    {
      int refPos = blocks.get(0).getReferenceStart()+offset-refSeqStart;
      int xstart = refPos*ALIGNMENT_PIX_PER_BASE;
      int width  = len*ALIGNMENT_PIX_PER_BASE;
      g2.setColor(Color.red);
      g2.drawRect(xstart, ypos-BASE_HEIGHT, width, BASE_HEIGHT);
    }
    
    if(lastMousePoint != null)
    {
      int refPos = blocks.get(0).getReferenceStart()+offset-refSeqStart;
      int xstart = refPos*ALIGNMENT_PIX_PER_BASE;
      int xend   = (refPos+len)*ALIGNMENT_PIX_PER_BASE;

      if(lastMousePoint.getY() > ypos-11 && lastMousePoint.getY() < ypos)
      if(lastMousePoint.getX() > xstart &&
         lastMousePoint.getX() < xend)
      {
        mouseOverSAMRecord = samRecord;    
      }
    }
  }
  
  /**
   * Draw zoomed-out view.
   * @param g2
   * @param seqLength
   * @param pixPerBase
   * @param start
   * @param end
   */
  private void drawLineView(Graphics2D g2, int seqLength, float pixPerBase, int start, int end)
  {
    drawSelectionRange(g2, pixPerBase,start, end);
    if(showScale)
      drawScale(g2, start, end, pixPerBase, getHeight());
    
    Stroke stroke =
      new BasicStroke (1.3f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND);
    g2.setStroke(stroke);
    
    int scaleHeight;
    if(isShowScale())
      scaleHeight = 15;
    else
      scaleHeight = 0;
    
    int baseAtStartOfView = getBaseAtStartOfView();
    Rectangle r = jspView.getViewport().getViewRect();
    
    for(int i=0; i<readsInView.size(); i++)
    {
      SAMRecord samRecord = readsInView.get(i);
      SAMRecord samNextRecord = null;      

      if( !samRecord.getReadPairedFlag() ||  // read is not paired in sequencing
          samRecord.getMateUnmappedFlag() )  // mate is unmapped
      {
        if(isSingle)
        {
          int ypos = (getHeight() - scaleHeight) - samRecord.getReadString().length();
          if(ypos > r.getMaxY() || ypos < r.getMinY())
            continue;
          
          g2.setColor(Color.black);
          drawRead(g2, samRecord, pixPerBase, ypos, baseAtStartOfView);
        }
        continue;
      }

      int ypos = (getHeight() - scaleHeight) - ( Math.abs(samRecord.getInferredInsertSize()) );
      if( (ypos > r.getMaxY() || ypos < r.getMinY()) && ypos > 0 )
        continue;
      
      if(i < readsInView.size()-1)
      {
        samNextRecord = readsInView.get(++i);

        if(samRecord.getReadName().equals(samNextRecord.getReadName()))
        { 
          // draw connection between paired reads
          if(samRecord.getAlignmentEnd() < samNextRecord.getAlignmentStart() && 
              (samNextRecord.getAlignmentStart()-samRecord.getAlignmentEnd())*pixPerBase > 2.f)
          {
            g2.setColor(Color.LIGHT_GRAY);

            drawTranslucentLine(g2, 
                   (int)((samRecord.getAlignmentEnd()-getBaseAtStartOfView())*pixPerBase), 
                   (int)((samNextRecord.getAlignmentStart()-getBaseAtStartOfView())*pixPerBase), ypos);
          }
          
          if( samRecord.getReadNegativeStrandFlag() && // strand of the query (1 for reverse)
              samNextRecord.getReadNegativeStrandFlag() )
            g2.setColor(Color.red);
          else
            g2.setColor(Color.blue);
          
          drawRead(g2, samRecord, pixPerBase, ypos, baseAtStartOfView);
          drawRead(g2, samNextRecord, pixPerBase, ypos, baseAtStartOfView);
        }
        else
        {
          drawLoneRead(g2, samRecord, ypos, pixPerBase, baseAtStartOfView);
          i--;
        }
      }
      else
      {
        drawLoneRead(g2, samRecord, ypos, pixPerBase, baseAtStartOfView);
      }
    }
    
    drawYScale(g2, scaleHeight);
  }
  
  /**
   * Draw the reads as lines in vertical stacks. The reads are colour 
   * coded as follows:
   * 
   * blue  - reads are unique and are paired with a mapped mate
   * black - reads are unique and are not paired or have an unmapped mate
   * green - reads are duplicates
   * 
   * @param g2
   * @param seqLength
   * @param pixPerBase
   * @param start
   * @param end
   */
  private void drawStackView(Graphics2D g2, 
                             int seqLength, 
                             float pixPerBase, 
                             int start, 
                             int end)
  {
    drawSelectionRange(g2, pixPerBase,start, end);
    if(isShowScale())
      drawScale(g2, start, end, pixPerBase, getHeight());
    
    BasicStroke stroke = new BasicStroke(
        1.3f,
        BasicStroke.CAP_BUTT, 
        BasicStroke.JOIN_MITER);
    g2.setStroke(stroke);
    
    int scaleHeight;
    if(isShowScale())
      scaleHeight = 15;
    else
      scaleHeight = 0;
    
    int ypos = (getHeight() - scaleHeight);
    int maxEnd = 0;
    int lstStart = 0;
    int lstEnd = 0;
    int baseAtStartOfView = getBaseAtStartOfView();
    g2.setColor(Color.blue);
    Rectangle r = jspView.getViewport().getViewRect();
    
    for(int i=0; i<readsInView.size(); i++)
    {
      SAMRecord samRecord = readsInView.get(i);
      int offset = getSequenceOffset(samRecord.getReferenceName());

      int recordStart = samRecord.getAlignmentStart()+offset;
      int recordEnd = samRecord.getAlignmentEnd()+offset;
      
      if(lstStart != recordStart || lstEnd != recordEnd)
      { 
        if (!samRecord.getReadPairedFlag() ||  // read is not paired in sequencing
            samRecord.getMateUnmappedFlag() )  // mate is unmapped )  // mate is unmapped 
          g2.setColor(Color.black);
        else
          g2.setColor(Color.blue);
        
        if(maxEnd < recordStart)
        {
          ypos = (getHeight() - scaleHeight)-2;
          maxEnd = recordEnd+2;
        }
        else
          ypos = ypos-2;
      }
      else
        g2.setColor(darkGreen);

      lstStart = recordStart;
      lstEnd   = recordEnd;
      
      if(ypos > r.getMaxY() || ypos < r.getMinY())
        continue;
      drawRead(g2, samRecord, pixPerBase, ypos, baseAtStartOfView);
    }
  }
  
  /**
   * Draw the reads as lines in vertical stacks. The reads are colour 
   * coded as follows:
   * 
   * blue  - reads are unique and are paired with a mapped mate
   * black - reads are unique and are not paired or have an unmapped mate
   * green - reads are duplicates
   * 
   * @param g2
   * @param seqLength
   * @param pixPerBase
   * @param start
   * @param end
   */
  private void drawStrandStackView(Graphics2D g2, 
                                   int seqLength, 
                                   float pixPerBase, 
                                   int start, 
                                   int end)
  {
    drawSelectionRange(g2, pixPerBase,start, end);   
    BasicStroke stroke = new BasicStroke(
        1.3f,
        BasicStroke.CAP_BUTT, 
        BasicStroke.JOIN_MITER);
    
    int scaleHeight = 15;
    drawScale(g2, start, end, pixPerBase, ((getHeight()+scaleHeight)/2));

    int ymid = (getHeight()/ 2);
    // positive strand    
    drawStrand(g2, false, scaleHeight, ymid-(scaleHeight/2), -2, pixPerBase, stroke);
    
    // negative strand
    drawStrand(g2, true, scaleHeight, ymid+(scaleHeight/2), 2, pixPerBase, stroke);
  }
  
  private void drawStrand(Graphics2D g2, 
                          boolean isStrandNegative, 
                          int scaleHeight,
                          int ymid,
                          int ystep,
                          float pixPerBase,
                          Stroke stroke)
  {
    int ypos = (getHeight() - scaleHeight);
    int maxEnd = 0;
    int lstStart = 0;
    int lstEnd = 0;
    int baseAtStartOfView = getBaseAtStartOfView();
    g2.setColor(Color.blue);
    Rectangle r = jspView.getViewport().getViewRect();
    
    for(int i=0; i<readsInView.size(); i++)
    {
      SAMRecord samRecord = readsInView.get(i);
      
      if( samRecord.getReadNegativeStrandFlag() == isStrandNegative )
      {
        int offset = getSequenceOffset(samRecord.getReferenceName());
        int recordStart = samRecord.getAlignmentStart()+offset;
        int recordEnd   = samRecord.getAlignmentEnd()+offset;
      
        if(lstStart != recordStart || lstEnd != recordEnd)
        { 
          if (!samRecord.getReadPairedFlag() ||   // read is not paired in sequencing
               samRecord.getMateUnmappedFlag() )  // mate is unmapped 
            g2.setColor(Color.black);
          else
            g2.setColor(Color.blue);
        
          if(maxEnd < recordStart)
          {
            ypos = ymid + ystep;
            maxEnd = recordEnd+2;
          }
          else
            ypos = ypos + ystep;
        }
        else
          g2.setColor(darkGreen);

        lstStart = recordStart;
        lstEnd   = recordEnd;
        
        if(ypos > r.getMaxY() || ypos < r.getMinY())
          continue;
        drawRead(g2, samRecord, pixPerBase, ypos, baseAtStartOfView);
      }
    }
  }
  
  /**
   * Draw the reads as lines in vertical stacks. The reads are colour 
   * coded as follows:
   * 
   * blue  - reads are unique and are paired with a mapped mate
   * black - reads are unique and are not paired or have an unmapped mate
   * green - reads are duplicates
   * 
   * @param g2
   * @param seqLength
   * @param pixPerBase
   * @param start
   * @param end
   */
  private void drawPairedStackView(Graphics2D g2, 
                                   int seqLength, 
                                   float pixPerBase, 
                                   int start, 
                                   int end)
  {
    drawSelectionRange(g2, pixPerBase,start, end);
    if(isShowScale())
      drawScale(g2, start, end, pixPerBase, getHeight());
    
    Vector<PairedRead> pairedReads = new Vector<PairedRead>();
    for(int i=0; i<readsInView.size(); i++)
    {
      SAMRecord samRecord = readsInView.get(i);

      if( !samRecord.getReadPairedFlag() ||  // read is not paired in sequencing
          samRecord.getMateUnmappedFlag() )  // mate is unmapped
        continue;

      SAMRecord samNextRecord = null;      
      if(i < readsInView.size()-1)
      {
        samNextRecord = readsInView.get(++i);
        PairedRead pr = new PairedRead();
        if(samRecord.getReadName().equals(samNextRecord.getReadName()))
        { 
          if(samRecord.getAlignmentStart() < samNextRecord.getAlignmentStart())
          {
            pr.sam1 = samRecord;
            pr.sam2 = samNextRecord;
          }
          else
          {
            pr.sam2 = samRecord;
            pr.sam1 = samNextRecord;
          }
          
        }
        else
        {
          --i;
          pr.sam1 = samRecord;
          pr.sam2 = null;
        }
        pairedReads.add(pr);
      }
    }
    Collections.sort(pairedReads, new PairedReadComparator());
    
    Stroke originalStroke = new BasicStroke (1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND); 
    Stroke stroke =
            new BasicStroke (1.3f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND);
    g2.setStroke(stroke);
    
    int scaleHeight;
    if(isShowScale())
      scaleHeight = 15;
    else
      scaleHeight = 0;
    
    int ypos = getHeight() - scaleHeight - 3;
    int lastEnd = 0;
    int baseAtStartOfView = getBaseAtStartOfView();
    Rectangle r = jspView.getViewport().getViewRect();
    
    for(int i=0; i<pairedReads.size(); i++)
    {
      PairedRead pr = pairedReads.get(i);
      
      if(pr.sam1.getAlignmentStart() > lastEnd)
      {
        ypos = getHeight() - scaleHeight - 3;
        
        if(pr.sam2 != null)
        {  
          lastEnd = pr.sam2.getAlignmentEnd();
        }
        else
          lastEnd = pr.sam1.getAlignmentEnd();
      }
      else
        ypos = ypos - 3;
      
      if(ypos > r.getMaxY() || ypos < r.getMinY())
        continue;
      
      g2.setStroke(originalStroke);
      g2.setColor(Color.LIGHT_GRAY);
      
      if(pr.sam2 != null)
      {
        drawTranslucentJointedLine(g2, 
                (int)((pr.sam1.getAlignmentEnd()-getBaseAtStartOfView())*pixPerBase),
                (int)((pr.sam2.getAlignmentStart()-getBaseAtStartOfView())*pixPerBase), ypos);
      }
      else
      {
        if(!pr.sam1.getMateUnmappedFlag())
        {
          int prStart;
          
          if(pr.sam1.getAlignmentStart() > pr.sam1.getMateAlignmentStart())
            prStart = pr.sam1.getAlignmentEnd();
          else
            prStart = pr.sam1.getAlignmentStart();
            
          drawTranslucentJointedLine(g2, 
              (int)( (prStart-getBaseAtStartOfView())*pixPerBase),
              (int)( (pr.sam1.getMateAlignmentStart()-getBaseAtStartOfView())*pixPerBase), ypos);
        }
      }
      
      if( pr.sam1.getReadNegativeStrandFlag() && // strand of the query (1 for reverse)
          ( pr.sam2 != null && pr.sam2.getReadNegativeStrandFlag() ) )
        g2.setColor(Color.red);
      else
        g2.setColor(Color.blue);
      drawRead(g2, pr.sam1, pixPerBase, ypos, baseAtStartOfView);
      
      if(pr.sam2 != null)
        drawRead(g2, pr.sam2, pixPerBase, ypos, baseAtStartOfView);
    }
  }
  
  
  /**
   * Draw a read that apparently has a read mate that is not in view.
   * @param g2
   * @param thisRead
   * @param ypos
   * @param pixPerBase
   * @param originalStroke
   * @param stroke
   */
  private void drawLoneRead(Graphics2D g2, SAMRecord samRecord, int ypos, 
      float pixPerBase, int baseAtStartOfView)
  {
    boolean offTheTop = false;
    int offset = getSequenceOffset(samRecord.getReferenceName());
    int thisStart = samRecord.getAlignmentStart()+offset;
    int thisEnd   = thisStart + samRecord.getReadString().length() -1;
    
    if(ypos <= 0)
    {
      offTheTop = true;
      ypos = samRecord.getReadString().length();
    }
      
    if(Math.abs(samRecord.getMateAlignmentStart()-samRecord.getAlignmentEnd())*pixPerBase > 2.f)
    {
      g2.setColor(Color.LIGHT_GRAY);
      
      if(samRecord.getAlignmentEnd() < samRecord.getMateAlignmentStart())
      {
        int nextStart = 
          (int)((samRecord.getMateAlignmentStart()-getBaseAtStartOfView()+offset)*pixPerBase);
        drawTranslucentLine(g2, 
          (int)((thisEnd-getBaseAtStartOfView())*pixPerBase), nextStart, ypos);
      }
      else
      {
        int nextStart = 
            (int)((samRecord.getMateAlignmentStart()-getBaseAtStartOfView()+offset)*pixPerBase);
        drawTranslucentLine(g2, 
            (int)((thisStart-getBaseAtStartOfView())*pixPerBase), nextStart, ypos);
      }
    }
    
    if(offTheTop)
      g2.setColor(darkOrange); 
    else if(samRecord.getReadNegativeStrandFlag()) // strand of the query (1 for reverse)
      g2.setColor(Color.red);
    else
      g2.setColor(Color.blue);

 
    drawRead(g2, samRecord, pixPerBase, ypos, baseAtStartOfView);
    
    if (isSNPs)
      showSNPsOnReads(g2, samRecord, pixPerBase, ypos, offset);
  }

  
  private void drawScale(Graphics2D g2, int start, int end, float pixPerBase, int ypos)
  {
    g2.setColor(Color.black);
    g2.drawLine( 0, ypos-14,
                 (int)((end - getBaseAtStartOfView())*pixPerBase),   ypos-14);
    int interval = end-start;
    
    if(interval > 256000)
      drawTicks(g2, start, end, pixPerBase, 512000, ypos);
    else if(interval > 64000)
      drawTicks(g2, start, end, pixPerBase, 12800, ypos);
    else if(interval > 16000)
      drawTicks(g2, start, end, pixPerBase, 3200, ypos);
    else if(interval > 4000)
      drawTicks(g2, start, end, pixPerBase, 800, ypos);
    else if(interval > 1000)
      drawTicks(g2, start, end, pixPerBase, 400, ypos);
    else
      drawTicks(g2, start, end, pixPerBase, 100, ypos);
  }
  
  private void drawTicks(Graphics2D g2, int start, int end, float pixPerBase, int division, int ypos)
  {
    int markStart = (Math.round(start/division)*division);
    
    if(markStart < 1)
      markStart = 1;
    
    int sm = markStart-(division/2);
    float x;
    if(sm > start)
    {
      x = (sm-getBaseAtStartOfView())*pixPerBase;
      g2.drawLine((int)x, ypos-14,(int)x, ypos-12);
    }
    
    for(int m=markStart; m<end; m+=division)
    {
      x = (m-getBaseAtStartOfView())*pixPerBase;
      g2.drawString(Integer.toString(m), x, ypos-1);
      g2.drawLine((int)x, ypos-14,(int)x, ypos-11);
      
      sm = m+(division/2);
      
      if(sm < end)
      {
        x = (sm-getBaseAtStartOfView())*pixPerBase;
        g2.drawLine((int)x, ypos-14,(int)x, ypos-12);
      }
      
      if(m == 1)
        m = 0;
    }
  }
  
  /**
   * Draw a y-scale for inferred size (isize) of reads.
   * @param g2
   * @param xScaleHeight
   */
  private void drawYScale(Graphics2D g2, int xScaleHeight)
  {
    g2.setColor(Color.black);
    int maxY = getPreferredSize().height-xScaleHeight;
    
    for(int i=100; i<maxY; i+=100)
    {
      int ypos = getHeight()-i-xScaleHeight;
      g2.drawLine(0, ypos, 2, ypos);
      g2.drawString(Integer.toString(i), 3, ypos);
    }
  }
  
  /**
   * Draw a given read.
   * @param g2
   * @param thisRead
   * @param pixPerBase
   * @param ypos
   * @param baseAtStartOfView
   */
  private void drawRead(Graphics2D g2, SAMRecord thisRead,
		                float pixPerBase,
		                int ypos,
		                int baseAtStartOfView)
  {
    int offset = getSequenceOffset(thisRead.getReferenceName());

    int thisStart = thisRead.getAlignmentStart()+offset-baseAtStartOfView;
    int thisEnd   = thisRead.getAlignmentEnd()+offset-baseAtStartOfView;
    
    if(highlightSAMRecord != null && 
       highlightSAMRecord.getReadName().equals(thisRead.getReadName()))
     {
       Stroke originalStroke = g2.getStroke();
       Stroke stroke =
         new BasicStroke (3.f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND);
       g2.setStroke(stroke);
       Color c = g2.getColor();
       g2.setColor(Color.black);
       g2.drawLine((int)( thisStart * pixPerBase), ypos,
                   (int)( thisEnd * pixPerBase), ypos);
       g2.setColor(c);
       g2.setStroke(originalStroke);
     }

    g2.drawLine((int)( thisStart * pixPerBase), ypos,
                (int)( thisEnd * pixPerBase), ypos);
    

    // test if the mouse is over this read
    if(lastMousePoint != null)
    {
      if(lastMousePoint.getY()+2 > ypos && lastMousePoint.getY()-2 < ypos)
      if(lastMousePoint.getX() > thisStart * pixPerBase &&
         lastMousePoint.getX() < thisEnd * pixPerBase)
      {
        mouseOverSAMRecord = thisRead;
      }
    }
    
    if (isSNPs)
      showSNPsOnReads(g2, thisRead, pixPerBase, ypos, offset);
  }
  
  /**
   * Highlight a selected range
   * @param g2
   * @param pixPerBase
   * @param start
   * @param end
   */
  private void drawSelectionRange(Graphics2D g2, float pixPerBase, int start, int end)
  {
    if(getSelection() != null)
    {
      Range selectedRange = getSelection().getSelectionRange();

      if(selectedRange != null)
      {
        int rangeStart = selectedRange.getStart();
        int rangeEnd   = selectedRange.getEnd();
        
        if(end < rangeStart || start > rangeEnd)
          return;
        
        int x = (int) (pixPerBase*(rangeStart-getBaseAtStartOfView()));
        int width = (int) (pixPerBase*(rangeEnd-rangeStart+1));
        
        g2.setColor(Color.pink);
        g2.fillRect(x, 0, width, getHeight());
      }
    }
  }
  
  /**
   * Draw a translucent line
   * @param g2
   * @param start
   * @param end
   * @param ypos
   */
  private void drawTranslucentLine(Graphics2D g2, int start, int end, int ypos)
  {
    Composite origComposite = g2.getComposite();
    g2.setComposite(translucent);
    g2.drawLine(start, ypos, end, ypos);
    g2.setComposite(origComposite);
  }
  
  /**
   * Draw a translucent line
   * @param g2
   * @param start
   * @param end
   * @param ypos
   */
  private void drawTranslucentJointedLine(Graphics2D g2, int start, int end, int ypos)
  {
    Composite origComposite = g2.getComposite();
    g2.setComposite(translucent);
    
    int mid = (int) ((end-start)/2.f)+start;
    //g2.drawLine(start, ypos, end, ypos);
    g2.drawLine(start, ypos, mid, ypos-5);
    g2.drawLine(mid, ypos-5, end, ypos);
    g2.setComposite(origComposite);
  }
  
  /**
   * Display the SNPs for the given read.
   * @param g2
   * @param thisRead
   * @param pixPerBase
   * @param ypos
   */
  private void showSNPsOnReads(Graphics2D g2, SAMRecord thisRead,
                               float pixPerBase, int ypos, int offset)
  {
    int thisStart = thisRead.getAlignmentStart();
    int thisEnd   = thisRead.getAlignmentEnd();
    
    // use alignment blocks of the contiguous alignment of
    // subsets of read bases to a reference sequence
    List<AlignmentBlock> blocks = thisRead.getAlignmentBlocks();
    try
    {
      char[] refSeq = bases.getSubSequenceC(
          new Range(thisStart+offset, thisEnd+offset), Bases.FORWARD);
      byte[] readSeq = thisRead.getReadBases();

      Color col = g2.getColor();
      g2.setColor(Color.red);

      offset = offset - getBaseAtStartOfView();
      for(int i=0; i<blocks.size(); i++)
      {
        AlignmentBlock block = blocks.get(i);
        for(int j=0; j<block.getLength(); j++)
        {
          int readPos = block.getReadStart()-1+j;
          int refPos  = block.getReferenceStart()+j;

          if (Character.toUpperCase(refSeq[refPos-thisStart]) != readSeq[readPos])
          {
            g2.drawLine((int) ((refPos+offset) * pixPerBase), ypos + 2,
                        (int) ((refPos+offset) * pixPerBase), ypos - 2);
          }
        }
        
      }

      g2.setColor(col);
    }
    catch (OutOfRangeException e)
    {
      e.printStackTrace();
    }
  }
  
  /**
   * Add the alignment view to the supplied <code>JPanel</code> in
   * a <code>JScrollPane</code>.
   * @param mainPanel  panel to add the alignment to
   * @param autohide automatically hide the top panel containing the buttons
   */
  public void addJamToPanel(final JPanel mainPanel,
                            final JFrame frame,
                            final boolean autohide,
                            final FeatureDisplay feature_display)
  {
    this.mainPanel = mainPanel;
    final JComponent topPanel;
    if(feature_display != null)
    {
      this.feature_display = feature_display;
      this.selection = feature_display.getSelection();
      topPanel = new JPanel(new FlowLayout(FlowLayout.LEADING, 0, 0));
    }
    else
    { 
      topPanel = new JMenuBar();
      frame.setJMenuBar((JMenuBar)topPanel);
    }
    
    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", autohide);
    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.addItemListener(new ItemListener()
    {
      public void itemStateChanged(ItemEvent e)
      {
        laststart = -1;
        lastend = -1;
        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);

    mainPanel.setPreferredSize(new Dimension(900, 400));
    
    jspView = new JScrollPane(this, 
        JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
        JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

    setDisplay(1, nbasesInView, null);
    mainPanel.setLayout(new BorderLayout());

    if(topPanel instanceof JPanel)
      mainPanel.add(topPanel, BorderLayout.NORTH);
    mainPanel.add(jspView, BorderLayout.CENTER);
    
    JPanel bottomPanel = new JPanel(new BorderLayout());
    coveragePanel = new CoveragePanel(this);
    bottomPanel.add(coveragePanel, BorderLayout.CENTER);

    if(feature_display == null)
    {
      scrollBar = new JScrollBar(JScrollBar.HORIZONTAL, 1, nbasesInView, 1,
          getMaxBasesInPanel(getSequenceLength()));
      scrollBar.setUnitIncrement(nbasesInView/20);
      scrollBar.addAdjustmentListener(new AdjustmentListener()
      {
        public void adjustmentValueChanged(AdjustmentEvent e)
        {
          repaint();
        }
      });
      bottomPanel.add(scrollBar, BorderLayout.SOUTH);
    }

    mainPanel.add(bottomPanel, BorderLayout.SOUTH);
    coveragePanel.setPreferredSize(new Dimension(900, 100));
    coveragePanel.setVisible(false);
    
    jspView.getVerticalScrollBar().setValue(
        jspView.getVerticalScrollBar().getMaximum());
    jspView.getVerticalScrollBar().setUnitIncrement(maxUnitIncrement);
    
    if(feature_display == null)
    {
      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;
          }
        }
      });
    }

    addMouseListener(new PopupListener());
    setFocusable(true);
    requestFocusInWindow();
    addFocusListener(new FocusListener()
    {
      public void focusGained(FocusEvent fe){}
      public void focusLost(FocusEvent fe){}
    });
  }

  
  private void createMenus(JComponent view)
  {
    JMenu showMenu = new JMenu("Show");
    JCheckBoxMenuItem checkBoxSingle = new JCheckBoxMenuItem("Single Reads");
    checkBoxSingle.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        repaint();
        isSingle = !isSingle;
      }
    });
    showMenu.add(checkBoxSingle);

    JCheckBoxMenuItem checkBoxSNPs = new JCheckBoxMenuItem("SNPs");
    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;
        repaint();
      }
    });