e325b487322b1ae05b838b968ee933718890ebb4
hiram
  Mon Oct 26 12:38:06 2020 -0700
begin transition to track specific mouse movement events refs #21980

diff --git src/hg/js/mouseOver.js src/hg/js/mouseOver.js
index 3afe19a..0904f0e 100644
--- src/hg/js/mouseOver.js
+++ src/hg/js/mouseOver.js
@@ -1,220 +1,204 @@
 
 // One single top-level object variable to hold all other global variables
 var mapData = {};
 // mapData.rects[] - an array of the rectangles, where each rect is
 //                   {x1, y1, x2, y2, v} == x1,y1 x2,y2, value
 // mapData.spans{} - key name is track name, value is an array of
 //                   objects: {x1, x2, value}
 // mapData.visible - keep track of window visible or not, value: true|false
 //                   shouldn't need to do this here, the window knows if it
 //                   is visible or not, just ask it for status
 // mapData.tracks[]  - list of tracks that came in with mapBoxes
 // mapData.boxCount[]  - in same order as tracks[] number of boxes for track
 //                       this boxCount is just for debugging information
 
 // =========================================================================
 // intersect the point with the rectangle, where rect corners are x1,y1 x2,y2
 // =========================================================================
 function intersectPointRectangle(x,y, rect) {
   var answer = true;
   if (x <= rect.x1 || x > rect.x2) { answer = false; }
      else if (y <= rect.y1 || y > rect.y2) { answer = false; }
   return answer;
 }
 
 // given an X coordinate: x, find the index idx
 // in the rects[idx] array where rects[idx].x1 <= x < rects[idx].x2
 // returning -1 when not found
+// if we knew the array was sorted on x1 we could get out early
+//   when x < x1
 function findRange(x, rects) {
   var answer = -1;
   for ( var idx in rects ) {
      if ((rects[idx].x1 <= x) && (x < rects[idx].x2)) {
        answer = idx;
        break;
      }
   }
   return answer;
 }
 
 function mouseInTrackImage(evt) {
   var trackName = evt.target.id.replace("img_data_", "");
   var firstRect = "";
   if (mapData.spans[trackName]) {
     var lastRect = mapData.spans[trackName].length - 1;
     firstRect = mapData.spans[trackName][lastRect].x1 + ".." + mapData.spans[trackName][lastRect].x2;
   }
   var evX = evt.x;
   var evY = evt.y;
   var oLeft = $(this).offset().left;
   var oTop = $(this).offset().top;
   var offLeft = Math.max(0, Math.floor(evt.x - $(this).offset().left));
-  // need to find where offLeft is in the spans
+  var windowUp = false;     // see if window is supposed to become visible
   var foundIdx = -1;
   var valP = "noX";
   if (mapData.spans[trackName]) {
      foundIdx = findRange(offLeft, mapData.spans[trackName]);
   }
-  if (foundIdx > -1) { valP = mapData.spans[trackName][foundIdx].v; }
+  if (foundIdx > -1) {
+    valP = mapData.spans[trackName][foundIdx].v;
+    // value to display
+    var msg = "&nbsp;" + mapData.spans[trackName][foundIdx].v + "&nbsp;";
+    $('#mouseOverText').html(msg);
+    var msgWidth = Math.ceil($('#mouseOverText').width());
+    var msgHeight = Math.ceil($('#mouseOverText').height());
+    var posLeft = (evt.x - msgWidth) + "px";
+//    var posTop = (oTop + rect.y1) + "px";
+    var posTop = oTop + "px";
+    $('#mouseOverContainer').css('left',posLeft);
+    $('#mouseOverContainer').css('top',posTop);
+    windowUp = true;      // yes, window is to become visible
+  }
   var offTop = Math.max(0, Math.floor(evt.y - $(this).offset().top));
   var msg = "<p>. . . mouse in target.id: " + evt.target.id + "(" + trackName + ")[" + foundIdx + "]='" + valP + "' ["  + firstRect + "] at " + offLeft + "," + offTop + ", evX,Y: " + evX + "," + evY + ", offL,T: " + oLeft + "," + oTop + "</p>";
   $('#eventRects').html(msg);
+  if (windowUp) {     // the window should become visible
+    if (! mapData.visible) {        // should *NOT* have to keep track !*!
+      var contain = document.getElementById('mouseOverContainer');
+      var mouseOver = document.querySelector(".wigMouseOver");
+      mouseOver.classList.toggle("showMouseOver");
+      mapData.visible = true;
+    }
+  } else {    // the window should disappear
+    if (mapData.visible) {
+      var mouseOver = document.querySelector(".wigMouseOver");
+      mouseOver.classList.toggle("showMouseOver");
+      mapData.visible = false;
+    }
+  } //      window visible/not visible
 }
 
 // =========================================================================
 // receiveData() callback for successful JSON request, receives incoming JSON
 //             data and gets it into global variables for use here.
 //  The incoming 'arr' is a a set of objects where the object key name is
 //      the track name, used here as an array reference: arr[trackName]
 //        (currently only one object per json file, one file for each track,
 //           this may change to have multiple tracks in one json file.)
 //  The value associated with each track name
 //  is an array of box definitions, where each element in the array is a
 //     mapBox definition object:
 //        {x1:n ,y1:n, x2:n, y2:n, value:s}
 //        where n is an integer in the range: 0..width,
 //        and s is the value string to display
 //  Expecting to simplify this in the next iteration to need only
 //        x1:n, x2:n, value:s
 //     since the y coordinates are found in the DOM object for each track
 //     Will need to get them sorted on x1 for efficient searching as
 //     they accumulate in the local data structure here.
 // =========================================================================
 function receiveData(arr) {
   if (typeof mapData.rects === 'undefined') {
     mapData.rects = [];	// get this array started first time
     mapData.tracks = [];
     mapData.boxCount = [];
     mapData.spans = {};
   }
   mapData.visible = false;
   for (var trackName in arr) {
     mapData.tracks.push(trackName);
     mapData.spans[trackName] = [];
     // add a 'mousemove' event listener to each track display object
     var objectName = "td_data_" + trackName;
     var objectId  = document.getElementById(objectName);
     objectId.addEventListener('mousemove', mouseInTrackImage);
     var itemCount = 0;	// just for monitoring purposes
 // got to artifically rewrite the x coordinates going into spans
     var tdData = "td_data_" + trackName;
     var tdDataMap = document.getElementById(tdData);
     var tdRect = tdDataMap.getBoundingClientRect();
     var xOff = Math.floor(tdRect.left - 71);
     // save all the incoming mapBoxes into the mapData.rects[] array
     arr[trackName].forEach(function(box) {
       var span = { "x1":box.x1-xOff, "x2":box.x2-xOff, "v":box.v };
       mapData.spans[trackName].push(span);
       mapData.rects.push(box); ++itemCount});
     mapData.boxCount.push(itemCount);	// merely for debugging watch
   }
   var msg = "<ul>";
   for (var idx in mapData.tracks) {
       var trackName = mapData.tracks[idx];
       var imgData = "td_data_" + trackName;
       var imgMap  = document.getElementById(imgData);
       var imageRect = imgMap.getBoundingClientRect();
       var top = Math.floor(imageRect.top);
       var left = Math.floor(imageRect.left);
       var width = Math.floor(imageRect.width);
       var height = Math.floor(imageRect.height);
      msg += "<li>" + trackName + " at left,top (x,y)(w,h):" + left + "," + top + "(" + width + "," + height + ") has: " + mapData.boxCount[idx] + " mapBoxes</li>";
   }
   msg += "</ul>";
   $('#debugMsg').html(msg);
 }
 
 // =========================================================================
 // fetchMapData() sends JSON request, callback to receiveData() upon return
 // =========================================================================
 function fetchMapData(url) {
   var xmlhttp = new XMLHttpRequest();
   xmlhttp.onreadystatechange = function() {
     if (4 === this.readyState && 200 === this.status) {
       var mapData = JSON.parse(this.responseText);
       receiveData(mapData);
     }
   };
   xmlhttp.open("GET", url, true);
   xmlhttp.send();  // sends request and exits this function
                    // the onreadystatechange callback above will trigger
                    // when the data has safely arrived
 }	// function fetchMapData()
 
 // Mouse x,y positions arrive as fractions when the
 // WEB page is zoomed into to make the pixels larger.  Hence the Math.floor
 // to keep them as integers.
 function mouseMoving(x, y) {
   var xyMouse = "<p>. . . mouse at x,y: " + Math.floor(x) + "," + Math.floor(y);
   $('#xyMouse').html(xyMouse);
-  if (typeof mapData.rects !== 'undefined') { // if there are rectangles
-    for (var i = 0; i < mapData.tracks.length; i++) {
-      var trackName = mapData.tracks[i];
-      var imgData = "img_data_" + trackName;
-      var imgMap  = document.getElementById(imgData);
-      var imageRect = imgMap.getBoundingClientRect();
-      var imageTop = imageRect.top;
-      // x1,y1 are coordinates of mouse relative to the top,left corner of
-      // the browser tracks image
-      var x1 = x - Math.floor(imageRect.left);
-      var y1 = y - Math.floor(imageRect.top);
-      var windowUp = false;     // see if window is supposed to become visible
-
-      for (var rect of mapData.rects) {         // work through rects list
-        if (intersectPointRectangle(x1,y1, rect)) {     // found mouse in rect
-          var msg = "&nbsp;" + rect.v + "&nbsp;";       // value to display
-          $('#mouseOverText').html(msg);
-          var msgWidth = Math.ceil($('#mouseOverText').width());
-          var msgHeight = Math.ceil($('#mouseOverText').height());
-          var posLeft = (x - msgWidth) + "px";
-          var posTop = (imageTop + rect.y1) + "px";
-          $('#mouseOverContainer').css('left',posLeft);
-          $('#mouseOverContainer').css('top',posTop);
-          windowUp = true;      // yes, window is to become visible
-          break;        //      can stop looking after first match
-        }
-      }
-      if (windowUp) {     // the window should become visible
-        if (! mapData.visible) {        // should *NOT* have to keep track !*!
-          var contain = document.getElementById('mouseOverContainer');
-//          var text = document.getElementById('mouseOverText');
-//          text.style.backgroundColor = "#ff69b4";
-          var mouseOver = document.querySelector(".wigMouseOver");
-          mouseOver.classList.toggle("showMouseOver");
-          mapData.visible = true;
-        }
-      } else {    // the window should disappear
-        if (mapData.visible) {
-            var mouseOver = document.querySelector(".wigMouseOver");
-            mouseOver.classList.toggle("showMouseOver");
-            mapData.visible = false;
-        }
-      } //      window visible/not visible
-    }	//	for each track
-  }     //	if there are rectangles defined
 }	//	function mouseMoving(x, y)
 
 function getMouseOverData() {
   // there could be a number of these mouseOver class elements
   // there is one for each track that has this mouseOver data
   var x = document.getElementsByClassName("mouseOver");
   for (var i = 0; i < x.length; i++) {
      var trashUrl = x[i].getAttribute('trashFile');
      fetchMapData(trashUrl);
   }
 }
 
 function getMousePos(evt) {
   return { x: evt.clientX, y: evt.clientY };
 }
 
 function addMouseMonitor() {
   window.addEventListener('load', function(evt) {
     getMouseOverData();
   }, false);
   window.addEventListener('mousemove', function(evt) {
     var mousePos = getMousePos(evt);
     mouseMoving(Math.floor(mousePos.x), Math.floor(mousePos.y));
   }, false);
 }
 
 $('document').ready(addMouseMonitor());