turingmachine.js/poc.gear.html at master · prokls/turingmachine.js · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>PoC for gear animation</title>
    <link rel="stylesheet" type="text/css" href="turingmachine.css" />
    <style type="text/css">
      div { float: left; width: 200px; height: 200px; }
      img { width: 155px; height: 155px; }
      .gear-animation { animation: none; }
    </style>
    <script type="text/javascript" src="deps/jquery-1.11.3.js"></script>
    <script type="text/javascript">

      var CountingQueue = function () {
        var counter = [];

        var inc = function () {
          if (counter.length === 0)
            counter.push(1);
          else if (counter[counter.length - 1] > 0)
            counter[counter.length - 1] += 1;
          else if (counter[counter.length - 1] < 0)
            counter.push(1);
        };

        var dec = function () {
          if (counter.length === 0)
            counter.push(-1);
          else if (counter[counter.length - 1] > 0)
            counter.push(-1);
          else if (counter[counter.length - 1] < 0)
            counter[counter.length - 1] -= 1;
        };

        var pop = function () {
          return counter.splice(0, 1);
        };

        var total = function () {
          return counter.map(function (v) { return Math.abs(v); })
            .reduce(function (a, b) { return a + b; });
        };

        var isEmpty = function () { return counter.length === 0; }

        return {
            inc: inc, dec: dec, pop: pop,
            total: total, isEmpty: isEmpty
        };
      };

      var GearVisualization = function (queue) {
        var currently_running = false;

        // Turingmachine API

        var addStepsLeft = function (count) {
          if (count === undefined)
            count = 1;

          for (var i = 0; i < count; i++)
            queue.dec();

          if (!currently_running)
            nextAnimation();
        };

        var addStepsRight = function (count) {
          if (count === undefined)
            count = 1;

          for (var i = 0; i < count; i++)
            queue.inc();

          if (!currently_running)
            nextAnimation();
        };

        // animation

        var computeSpeed = function (total) {
          // 1 step = 2s
          // 10 steps = 10 * 0.25s
          // 20 steps = 20 * 0.25s

          if (total <= 1)
            return '2s';
          else if (total >= 10)
            return '250ms';
          else {
            var val = (-1.0 * total) * (1750.0 / 9) + (1750.0 / 9) + 2000;
            return "" + parseInt(val) + "ms";
          }
        };

        var nextAnimation = function () {
          if (queue.isEmpty())
            return;

          var speed = computeSpeed(queue.total());
          var steps = queue.pop();

          startAnimation({
            animationTimingFunction: (Math.abs(steps) > 1) ? "linear" : "ease-in-out",
            animationName: "gear-" + (steps < 0 ? "left" : "right"),
            animationIterationCount: Math.abs(steps),
            animationDuration: speed
          });
        };

        var startAnimation = function (properties) {
          var defaultProperties = {
            animationName: 'gear-left',
            animationDuration: '2s',
            animationTimingFunction: 'ease',
            animationDelay: '0s',
            animationIterationCount: 1,
            animationDirection: 'normal',
            animationPlayState: 'paused'
          };

          currently_running = true;
          for (var prop in properties)
            defaultProperties[prop] = properties[prop];
          defaultProperties['animationPlayState'] = 'running';

          var oldGear = document.querySelector('.gear-animation');
          var oldUid = parseInt(oldGear.getAttribute('data-uid'));
          if (isNaN(oldUid))
            oldUid = parseInt(Math.random() * Math.pow(2, 32));
          var newUid = parseInt(Math.random() * Math.pow(2, 32));
          if (newUid === oldUid)
            newUid = oldUid + 1;

          var newGear = $(oldGear).clone(true).attr("data-uid", newUid);

          oldGear.setAttribute("data-uid", oldUid);
          $(oldGear).before(newGear);
          for (var prop in defaultProperties) {
            newGear[0].style[prop] = defaultProperties[prop];
          }
          $("*[data-uid=" + oldUid + "]").remove();

          newGear[0].addEventListener("animationend", function () {
            currently_running = false;
            nextAnimation();
          }, false);
        };

        return { addStepsLeft: addStepsLeft, addStepsRight: addStepsRight, startAnimation: startAnimation };
      };

      $(document).ready(function () {
        var rotations = new CountingQueue();
        var gear = new GearVisualization(rotations);

        $("#left1").click(function () { gear.addStepsLeft(1); });
        $("#right1").click(function () { gear.addStepsRight(1); });
        $("#left_").click(function () { gear.addStepsLeft(5); });
        $("#right_").click(function () { gear.addStepsRight(5); });
      });
    </script>
  </head>

  <body>
    <input type="submit" id="left1" value="1 step left" />
    <input type="submit" id="right1" value="1 step right" />
    <input type="submit" id="left_" value="scroll left" />
    <input type="submit" id="right_" value="scroll right" />
    <div class="gear-animation">
      <img src="static/gear.svg" alt="Gear #1" />
    </div>
  </body>
</html>