cesium - Adding and Updating labels on screen -


the problem have seems pretty easy , obvious, couldn't find way cesium. want have labels, or info box show progress of problem, labels adding screen in time (i can have labels @ beginning of program , change color of them time too).

  1. i don't know how create label such location depends on screen or page (for example top of page) , not on position of object, such world or cesium widget. (a kind of position direct visual representation)
  2. to update labels, can define 2 intervals different texts?
  3. can make labels buttons appearing sequentially , example change current time of program?

thanks,

if want labels fixed in screen-space, best way overlay html on top of cesium widget. can have translucent background, , clickable html buttons. can use viewer.clock.ontick update labels based on current time. here's example, click "run code snippet" @ bottom of this.

var viewer = new cesium.viewer('cesiumcontainer', {      navigationhelpbutton: false  });  viewer.scene.globe.enablelighting = true;  viewer.clock.clockrange = cesium.clockrange.loop_stop;    var hourplusbutton = document.getelementbyid('hourplus');  var hourminusbutton = document.getelementbyid('hourminus');  var timelabel = document.getelementbyid('timelabel');    // clock tick listener gets called every animation frame.  // keep fast , try not allocate memory if possible.  viewer.clock.ontick.addeventlistener(function(clock) {      var elapsed = cesium.juliandate.secondsdifference(          clock.currenttime, clock.starttime);      var hours = math.floor(elapsed / 3600);      elapsed -= (hours * 3600);      var minutes = math.floor(elapsed / 60);      elapsed -= (minutes * 60);      timelabel.textcontent = hours + ' hr ' + minutes + ' min ' +          elapsed.tofixed(1) + ' sec';  });    // button click callbacks free allocate memory.  hourplusbutton.addeventlistener('click', function() {      viewer.clock.currenttime = cesium.juliandate.addseconds(          viewer.clock.currenttime, 3600, new cesium.juliandate());  }, false);    hourminusbutton.addeventlistener('click', function() {      viewer.clock.currenttime = cesium.juliandate.addseconds(          viewer.clock.currenttime, -3600, new cesium.juliandate());  }, false);
html, body, #cesiumcontainer {    width: 100%; height: 100%; margin: 0; padding: 0;    overflow: hidden; font-family: sans-serif;  }  .controlpanel {    position: absolute;    top: 10px;    left: 10px;    background: rgba(42, 42, 42, 0.8);    color: #edffff;    white-space: nowrap;    padding: 4px 8px;    border-radius: 4px;  }
<link href="http://cesiumjs.org/cesium/build/cesium/widgets/widgets.css"         rel="stylesheet"/>  <script src="http://cesiumjs.org/cesium/build/cesium/cesium.js"></script>  <div id="cesiumcontainer"></div>  <div class="controlpanel">      <h5>elapsed time: <span id="timelabel"></span></h5>      <div>          <button type="button" class="cesium-button" id="hourminus">-1 hour</button>          <button type="button" class="cesium-button" id="hourplus">+1 hour</button>      </div>  </div>


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