claygl/example/lib/stats.js

/**
 * @author mrdoob / http://mrdoob.com/
 */

var Stats = function () {
  var startTime = Date.now(),
    prevTime = startTime;
  var ms = 0,
    msMin = Infinity,
    msMax = 0;
  var fps = 0,
    fpsMin = Infinity,
    fpsMax = 0;
  var frames = 0,
    mode = 0;

  var container = document.createElement('div');
  container.id = 'stats';
  container.addEventListener(
    'mousedown',
    function (event) {
      event.preventDefault();
      setMode(++mode % 2);
    },
    false
  );
  container.style.cssText = 'width:80px;opacity:0.9;cursor:pointer';

  var fpsDiv = document.createElement('div');
  fpsDiv.id = 'fps';
  fpsDiv.style.cssText = 'padding:0 0 3px 3px;text-align:left;background-color:#002';
  container.appendChild(fpsDiv);

  var fpsText = document.createElement('div');
  fpsText.id = 'fpsText';
  fpsText.style.cssText =
    'color:#0ff;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px';
  fpsText.innerHTML = 'FPS';
  fpsDiv.appendChild(fpsText);

  var fpsGraph = document.createElement('div');
  fpsGraph.id = 'fpsGraph';
  fpsGraph.style.cssText = 'position:relative;width:74px;height:30px;background-color:#0ff';
  fpsDiv.appendChild(fpsGraph);

  while (fpsGraph.children.length < 74) {
    var bar = document.createElement('span');
    bar.style.cssText = 'width:1px;height:30px;float:left;background-color:#113';
    fpsGraph.appendChild(bar);
  }

  var msDiv = document.createElement('div');
  msDiv.id = 'ms';
  msDiv.style.cssText = 'padding:0 0 3px 3px;text-align:left;background-color:#020;display:none';
  container.appendChild(msDiv);

  var msText = document.createElement('div');
  msText.id = 'msText';
  msText.style.cssText =
    'color:#0f0;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px';
  msText.innerHTML = 'MS';
  msDiv.appendChild(msText);

  var msGraph = document.createElement('div');
  msGraph.id = 'msGraph';
  msGraph.style.cssText = 'position:relative;width:74px;height:30px;background-color:#0f0';
  msDiv.appendChild(msGraph);

  while (msGraph.children.length < 74) {
    var bar = document.createElement('span');
    bar.style.cssText = 'width:1px;height:30px;float:left;background-color:#131';
    msGraph.appendChild(bar);
  }

  var setMode = function (value) {
    mode = value;

    switch (mode) {
      case 0:
        fpsDiv.style.display = 'block';
        msDiv.style.display = 'none';
        break;
      case 1:
        fpsDiv.style.display = 'none';
        msDiv.style.display = 'block';
        break;
    }
  };

  var updateGraph = function (dom, value) {
    var child = dom.appendChild(dom.firstChild);
    child.style.height = value + 'px';
  };

  return {
    REVISION: 11,

    domElement: container,

    setMode: setMode,

    begin: function () {
      startTime = Date.now();
    },

    end: function () {
      var time = Date.now();

      ms = time - startTime;
      msMin = Math.min(msMin, ms);
      msMax = Math.max(msMax, ms);

      msText.textContent = ms + ' MS (' + msMin + '-' + msMax + ')';
      updateGraph(msGraph, Math.min(30, 30 - (ms / 200) * 30));

      frames++;

      if (time > prevTime + 1000) {
        fps = Math.round((frames * 1000) / (time - prevTime));
        fpsMin = Math.min(fpsMin, fps);
        fpsMax = Math.max(fpsMax, fps);

        fpsText.textContent = fps + ' FPS (' + fpsMin + '-' + fpsMax + ')';
        updateGraph(fpsGraph, Math.min(30, 30 - (fps / 100) * 30));

        prevTime = time;
        frames = 0;
      }

      return time;
    },

    update: function () {
      startTime = this.end();
    }
  };
};