graycode/gray.html at master · smscotten/graycode · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="apple-mobile-web-app-capable" content="yes" />
    <meta name="apple-mobile-web-app-status-bar-style" content="black" />
    <meta name = "viewport" content = "user-scalable=no, width=device-width" />
    <title>Generate Gray Code</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css" />
    <script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
    <script src="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
    <script>

      var splitList = [0, 1]
      var bits = 1
      var base = 2

      $( document ).on( "mobileinit", function() {
        $.mobile.loader.prototype.options.text = "Calculating";
        $.mobile.loader.prototype.options.textVisible = true;
        $.mobile.loader.prototype.options.theme = "b";
        $.mobile.loader.prototype.options.html = "";
      });

      $(document).on( "pagecontainershow", function (event, ui) {

        $('form#graycode input#bits_in_list').change( function(event) {
          /*$.mobile.loading( "show", {
            text: "Calculating",
            textVisible: true,
            theme: "b",
            html: ""
          })*/
          //$.mobile.loading('show')
          console.log("About to set 'Calculating' and 'Rendering' messages")
          setCalcTimeMessage("Calculating…")
          setRenderTimeMessage("Rendering…")
          console.log("Just set 'Calculating' and 'Rendering' messages")

          var newBits = $(this).val()
          fontSize = 12 * (1 - (bits - 1) * .025)
          $('#listarea').css('font-size', fontSize+'pt')
          sliderColorRed = newBits < 6
                           ? '66'
                           : (newBits > 16
                              ? 'ff'
                              :(102 + (bits-6)*15).toString(16)) //e9 is 233
          sliderColorGreen = bits < 10
                             ? 'ff'
                             : (newBits > 16
                                ? '00'
                                : (255 - (bits-10)*20).toString(16))

          sliderColorBlue = newBits < 7
                          ? '66'
                          : ( newBits > 12
                              ? '00'
                              : (102 - (newBits-7)*19).toString(16) )
          $('.ui-slider .ui-slider-track').css('background-color', '#'+sliderColorRed+sliderColorGreen+sliderColorBlue)
          //$.when( redrawGrayCode(newBits, base) ).then( function( r ){
          //  $.mobile.loading( "hide" )
          //} );
          redrawGrayCode(newBits, base)
        })

        $('form#graycode input[name=base]').change( function(event) {
          console.log("About to set 'Rendering' message")
          setRenderTimeMessage("Rendering…")
          console.log("Just set 'Rendering' message")
          newBase = $(this).val()
          redrawGrayCode(bits, newBase)
        })

        $('form#graycode input[name=delimiter]').change( function(event) {
          console.log("About to set 'Rendering' message")
          setRenderTimeMessage("Rendering…")
          console.log("Just set 'Rendering' message")
          redrawGrayCode(bits, base)
        })

        $('form#graycode select#multiline').change( function(event) {
          $("p#renderTime").empty().html("Rendering…")
          redrawGrayCode(bits, base)
        })

        var redrawGrayCode = function(newBits, newBase) {
          var renderStartTime = Date.now()
          base = newBase
          if (newBits !== bits) {
            bits = newBits
            var calcStartTime = Date.now()
            splitList = makeGrayCode(bits)
            var calcEndTime = Date.now()
            console.log("About to set 'Calculated' message")
            setCalcTimeMessage("Calculated in "+formatElapsed(calcStartTime, calcEndTime))
            console.log("Just set 'Calculated' message")
          }
          var topOfList = 1 << bits
          var splitListInBase = splitList.map(function( n ) {
            var numberOfDigits = (topOfList - 1).toString(base).length
            var baseValue = n.toString(base)
            while (baseValue.length < numberOfDigits) {
              baseValue = "0" + baseValue;
            }
            return( baseValue )
          })
          var delimiter = $('#delimiter').val()
                        + ($('select#multiline').val() === 'on' ? "\n" : '')
          var splitListsString = splitListInBase.join(delimiter)
          $('#listarea').val(splitListsString)
          $('#listarea').keyup()
          var renderEndTime = Date.now()
          console.log("About to set 'Rendered' message")
          setRenderTimeMessage("Rendered in "+formatElapsed(renderStartTime, renderEndTime))
          console.log("Just set 'Rendered' message")
          //return "finished"
        }
        var setCalcTimeMessage = function( msg ){
          console.log("setCalcTimeMessage() called")
          $("p#calcTime").empty().html(msg)
        }
        var setRenderTimeMessage = function( msg ){
          console.log("setRenderTimeMessage() called")
          $("p#renderTime").empty().html(msg)
        }
      })

      var makeGrayCode = function(bits) {
        var length = 1 << bits
        var result = new Uint32Array(length)
        for (var i = 0; i < length; i++) {
          result[i] = i ^ (i >> 1)
        }
        return result
      }

      var formatElapsed = function(start, finish) {
        var elapsed = finish - start
        return ( elapsed > 999
                 ? (elapsed / 1000).toPrecision(4) + " seconds"
                 : elapsed + " ms" )
      }

    </script>
    <style type="text/css">
      textarea#listarea {
        font-family: "Source Code Pro", monospace;
        font-size: 12pt;
      }

      .ui-slider .ui-slider-track {
        background-color: #66ff66;
      }
    </style>

  </head>
  <body>
    <div data-role="page" id="pricepage" class="ui-responsive-panel">
      <div data-role="header" class="jqm-header" data-theme="b" data-position="fixed" data-tap-toggle="false">
          <h1>Generate a Gray Code Sequence</h1>
          <a href="#homePopup" data-rel="popup" data-position-to="window" data-transition="pop" data-icon="home" data-iconpos="notext">Home</a>
          <a href="https://en.wikipedia.org/wiki/Gray_code" data-icon="info">WTF is a Gray Code?</a>
      </div>
      <div role="main" class="ui-content jqm-content">
        <form id="graycode">
          <div class="ui-grid-a">
            <div class="ui-block-a">
              <div class="ui-field-contain">
                <label for="bits_in_list">Bits:</label>
                <input type="range" name="bits_in_list" id="bits_in_list" value="1" min="1" max="24" />
              </div>
            </div>
            <div class="ui-block-b">
              <div class="ui-field-contain">
                <fieldset data-role="controlgroup" data-type="horizontal">
                  <legend>Display:</legend>
                  <input type="radio" name="base" id="base-binary" value="2" checked="checked" />
                  <label for="base-binary">Binary</label>
                  <input type="radio" name="base" id="base-octal" value="8" />
                  <label for="base-octal">Octal</label>
                  <input type="radio" name="base" id="base-decimal" value="10" />
                  <label for="base-decimal">Decimal</label>
                  <input type="radio" name="base" id="base-hex" value="16" />
                  <label for="base-hex">Hex</label>
                </fieldset>
              </div>
            </div>
          </div>
          <div class="ui-grid-b">
            <div class="ui-block-a" style="padding-right: 10px;">
              <div class="ui-field-contain">
                <label for="delimiter">Delimiter:</label>
                <input type="text" name="delimiter" id="delimiter" value=", " />
              </div>
            </div>
            <div class="ui-block-b">
              <div class="ui-field-contain">
                <label for="multiline">Separate lines?</label>
                <select name="multiline" id="multiline" data-role="slider">
                  <option value="off">No</option>
                  <option value="on">Yes</option>
                </select>
              </div>
            </div>
            <div class="ui-block-c">
              <p id="calcTime"></p>
              <p id="renderTime"></p>
            </div>
          </div>
          <label for="listarea">Gray Code:</label>
          <textarea cols="60" rows="20" name="listarea" id="listarea" data-enhanced="true" class="ui-input-text ui-shadow-inset ui-body-inherit ui-corner-all">0, 1</textarea>
        </form>

      </div><!-- /main -->
      <div data-role="footer" class="ui-footer jqm-footer ui-responsive" style="overflow:hidden;" data-theme="b" data-position="fixed" data-tap-toggle="false">
        <!--a href="" class="ui-btn-left ui-btn ui-btn-inline ui-corner-all ui-btn-icon-left ui-icon-arrow-l">
          Footer Link 1
        </a-->
        <h4>Brought to you by the Aluminium Haberdashery</h4>
        <!--a href="" class="ui-btn-right ui-btn ui-btn-inline ui-corner-all ui-btn-icon-right ui-icon-arrow-r">
          Footer Link 2
        </a-->
      </div><!-- /footer -->
      <div data-role="popup" id="homePopup" data-overlay-theme="b" data-theme="a" data-dismissible="true" style="max-width:400px;">
        <div data-role="header" data-theme="b">
          <h1>Home?</h1>
        </div>
        <div role="main" class="ui-content">
          <h3 class="ui-title">Remember, many sad little websites don't have a home</h3>
          <p>Please give generously.</p>
          <a href="#" class="ui-btn ui-corner-all ui-shadow ui-btn-inline ui-btn-a" data-rel="back">Donate</a>
          <a href="#" class="ui-btn ui-corner-all ui-shadow ui-btn-inline ui-btn-a" data-rel="back" data-transition="flow">No, thanks</a>
        </div>
      </div><!-- /popup -->
    </div><!-- /page -->
  </body>
</html>