Fossil

    style.textContent = css;
    document.querySelector("head").appendChild(style);
  }
  amendCssOnce = 0;
}
var tooltipObj = document.createElement("span");
tooltipObj.className = "tl-tooltip";
tooltipObj.style.display = "none";
document.getElementsByClassName("content")[0].appendChild(tooltipObj);
/* Clear the close timer if the mouse is over the tooltip. */
tooltipObj.onmouseenter = function(e) {
  stopCloseTimer();
};
/* Init the close timer if the mouse is no longer over the tooltip. */
tooltipObj.onmouseleave = function(e) {
  if (tooltipInfo.ixActive != -1)
    resumeCloseTimer();
};
/* This object must be in the global scope, so that (non-shadowed) access is
** possible from within a setTimeout() closure. */
window.tooltipInfo = {
  dwellTimeout: 250,  /* The tooltip dwell timeout. */
  closeTimeout: 3000, /* The tooltip close timeout. */
  idTimer: 0,         /* The tooltip dwell timer id. */
  idTimerClose: 0,    /* The tooltip close timer id. */
  ixHover: -1,        /* The id of the element with the mouse. */
  ixActive: -1,       /* The id of the element with the tooltip. */
  posX: 0, posY: 0    /* The last mouse position. */
};
/* These functions must be in the global scope, so that access is possible from
** within (non-local) event handlers. */
var hideGraphTooltip = function() {
  stopCloseTimer();
  tooltipObj.style.display = "none";
  this.tooltipInfo.ixActive = -1;
}.bind(window);
var stopDwellTimer = function() {
  if (this.tooltipInfo.idTimer != 0) {
    clearTimeout(this.tooltipInfo.idTimer);
    this.tooltipInfo.idTimer = 0;
  }
}.bind(window);
var resumeCloseTimer = function() {
  /* This timer must be stopped explicitly to reset the elapsed timeout. */
  if (this.tooltipInfo.idTimerClose == 0) {
    this.tooltipInfo.idTimerClose = setTimeout(function() {
      this.tooltipInfo.idTimerClose = 0;
      hideGraphTooltip();
    }.bind(window),this.tooltipInfo.closeTimeout);
  }
}.bind(window);
var stopCloseTimer = function() {
  if (this.tooltipInfo.idTimerClose != 0) {
    clearTimeout(this.tooltipInfo.idTimerClose);
    this.tooltipInfo.idTimerClose = 0;
  }
}.bind(window);

/* Construct that graph corresponding to the timeline-data-N object */
function TimelineGraph(tx){
  var topObj = document.getElementById("timelineTable"+tx.iTableId);
  amendCss(tx.circleNodes, tx.showArrowheads);
  tooltipInfo.dwellTimeout = tx.dwellTimeout
  topObj.onclick = clickOnGraph
  topObj.ondblclick = dblclickOnGraph
  topObj.onmousemove = function(e) {
    var ix = findTxIndex(e);
    var cursor = (ix<0) ? "" : "pointer"; /* Or: cursor = "help"? */
    document.getElementsByTagName('body')[0].style.cursor = cursor;
    /* Keep the already visible tooltip at a constant position, as long as the
    ** mouse is over the same element. */
    var isReentry = false;  // Detect mouse move back to same element.
    if (tooltipObj.style.display != "none") {
      if (ix == tooltipInfo.ixHover)
        return;
      if (-1 == tooltipInfo.ixHover && ix == tooltipInfo.ixActive)
        isReentry = true;
    }
    /* The tooltip is either not visible, or the mouse is over a different
    ** element, so clear the dwell timer, and record the new element id and
    ** mouse position. */


    stopDwellTimer();

    if (ix >= 0) {
      /* Close the tooltip only if the mouse is over another element, and init
      ** the dwell timer again. */
      if (!isReentry)
        hideGraphTooltip();
      tooltipInfo.ixHover = ix;
      tooltipInfo.posX = e.x;
      tooltipInfo.posY = e.y;
      /* Clear the close timer, if not already cleared by hideGraphTooltip(). */
      stopCloseTimer();
      if (!isReentry && tooltipInfo.dwellTimeout>0) {
        tooltipInfo.idTimer = setTimeout(function() {
          this.tooltipInfo.idTimer = 0;
          /* Clear the timer to hide the tooltip. */
          stopCloseTimer();
          showGraphTooltip(
            this.tooltipInfo.ixHover,
            this.tooltipInfo.posX,
            this.tooltipInfo.posY);
          this.tooltipInfo.ixActive = this.tooltipInfo.ixHover;
        }.bind(window),tooltipInfo.dwellTimeout);
      }
    }
    else {
      tooltipInfo.ixHover = -1;
      /* The mouse is not over an element with a tooltip, init the hide
      ** timer. */
      resumeCloseTimer();
    }
  };
  topObj.onmouseleave = function(e) {
    /* Hide the tooltip if the mouse is outside the "timelineTableN" element,
    ** and outside the tooltip. */
    if (tooltipObj.style.display != "none" &&
          e.relatedTarget &&
          e.relatedTarget != tooltipObj) {
      tooltipInfo.ixHover = -1;
      hideGraphTooltip();
      /* Clear the dwell timer. */
      stopDwellTimer();
      /* Clear the close timer. */
      stopCloseTimer();


    }
  };
  var canvasDiv;
  var railPitch;
  var mergeOffset;
  var node, arrow, arrowSmall, line, mArrow, mLine, wArrow, wLine;

    for( var i=0; i<tx.nrail; i++) mergeBtm[i] = btm;
    for( var i=tx.rowinfo.length-1; i>=0; i-- ){
      drawNode(tx.rowinfo[i], btm);
    }
  }
  var selRow;
  function clickOnNode(e){
    hideGraphTooltip()
    var p = tx.rowinfo[parseInt(this.id.match(/\d+$/)[0], 10)-tx.iTopRow];
    if( !selRow ){
      selRow = p;
      this.className += " sel";
      canvasDiv.className += " sel";
    }else if( selRow==p ){
      selRow = null;

  }
  function clickOnGraph(e){
    var ix = findTxIndex(e);
    showGraphTooltip(ix,e.x,e.y);
  }
  function showGraphTooltip(ix,posX,posY){
    if( ix<0 ){
      hideGraphTooltip()
    }else{  
      var br = tx.rowinfo[ix].br
      var dest = branchHyperlink(ix)
      var hbr = br.replace(/&/g, "&amp;")
         .replace(/</g, "&lt;")
         .replace(/>/g, "&gt;")
         .replace(/"/g, "&quot;")
         .replace(/'/g, "&#039;");
      tooltipObj.innerHTML = "<a href=\""+dest+"\">"+hbr+"</a>"

      tooltipObj.style.position = "absolute"
      var x = posX + 4 + window.pageXOffset
      tooltipObj.style.left = x+"px"
      var y = posY + window.pageYOffset - tooltipObj.clientHeight - 4
      tooltipObj.style.top = y+"px"
      tooltipObj.style.display = "inline"
    }
  }
  function dblclickOnGraph(e){
    var ix = findTxIndex(e);
    var dest = branchHyperlink(ix)
    hideGraphTooltip()
    window.location.href = dest
  }
  function changeDisplay(selector,value){
    var x = document.getElementsByClassName(selector);
    var n = x.length;
    for(var i=0; i<n; i++) {x[i].style.display = value;}
  }