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Sunburst of Titantic Survival Data
license: mit

This Sunburst was built using the Titanic dataset made available in R. Inner-most circle is either "Yes" or "No" for surviving the incident, then the class, gender, and age of the members are outer-circles. Percentages for each are shown for each portion.

Thanks to timelyportfolio for the package SunburstR which built this visualization.

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<html>
<head>
<meta charset="utf-8" />
<script src="data:application/x-javascript;base64,(function() {
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  // @param tasks Array of strings (or falsy value, in which case no-op).
  //   Each element must be a valid JavaScript expression that yields a
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  // @param target The object that will be "this" for each function
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  function evalAndRun(tasks, target, args) {
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    find: function(scope) {
      return querySelectorAll(scope, "." + this.name);
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      var errClass = "shiny-output-error";
      if (err.type !== null) {
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        errClass = errClass + " " + $.map(asArray(err.type), function(type) {
          return errClass + "-" + type;
        }).join(" ");
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      errClass = errClass + " htmlwidgets-error";

      // Is el inline or block? If inline or inline-block, just display:none it
      // and add an inline error.
      var display = $el.css("display");
      $el.data("restore-display-mode", display);

      if (display === "inline" || display === "inline-block") {
        $el.hide();
        if (err.message !== "") {
          var errorSpan = $("<span>").addClass(errClass);
          errorSpan.text(err.message);
          $el.after(errorSpan);
        }
      } else if (display === "block") {
        // If block, add an error just after the el, set visibility:none on the
        // el, and position the error to be on top of the el.
        // Mark it with a unique ID and CSS class so we can remove it later.
        $el.css("visibility", "hidden");
        if (err.message !== "") {
          var errorDiv = $("<div>").addClass(errClass).css("position", "absolute")
            .css("top", el.offsetTop)
            .css("left", el.offsetLeft)
            // setting width can push out the page size, forcing otherwise
            // unnecessary scrollbars to appear and making it impossible for
            // the element to shrink; so use max-width instead
            .css("maxWidth", el.offsetWidth)
            .css("height", el.offsetHeight);
          errorDiv.text(err.message);
          $el.after(errorDiv);

          // Really dumb way to keep the size/position of the error in sync with
          // the parent element as the window is resized or whatever.
          var intId = setInterval(function() {
            if (!errorDiv[0].parentElement) {
              clearInterval(intId);
              return;
            }
            errorDiv
              .css("top", el.offsetTop)
              .css("left", el.offsetLeft)
              .css("maxWidth", el.offsetWidth)
              .css("height", el.offsetHeight);
          }, 500);
        }
      }
    },
    clearError: function(el) {
      var $el = $(el);
      var display = $el.data("restore-display-mode");
      $el.data("restore-display-mode", null);

      if (display === "inline" || display === "inline-block") {
        if (display)
          $el.css("display", display);
        $(el.nextSibling).filter(".htmlwidgets-error").remove();
      } else if (display === "block"){
        $el.css("visibility", "inherit");
        $(el.nextSibling).filter(".htmlwidgets-error").remove();
      }
    },
    sizing: {}
  };

  // Called by widget bindings to register a new type of widget. The definition
  // object can contain the following properties:
  // - name (required) - A string indicating the binding name, which will be
  //   used by default as the CSS classname to look for.
  // - initialize (optional) - A function(el) that will be called once per
  //   widget element; if a value is returned, it will be passed as the third
  //   value to renderValue.
  // - renderValue (required) - A function(el, data, initValue) that will be
  //   called with data. Static contexts will cause this to be called once per
  //   element; Shiny apps will cause this to be called multiple times per
  //   element, as the data changes.
  window.HTMLWidgets.widget = function(definition) {
    if (!definition.name) {
      throw new Error("Widget must have a name");
    }
    if (!definition.type) {
      throw new Error("Widget must have a type");
    }
    // Currently we only support output widgets
    if (definition.type !== "output") {
      throw new Error("Unrecognized widget type '" + definition.type + "'");
    }
    // TODO: Verify that .name is a valid CSS classname

    // Support new-style instance-bound definitions. Old-style class-bound
    // definitions have one widget "object" per widget per type/class of
    // widget; the renderValue and resize methods on such widget objects
    // take el and instance arguments, because the widget object can't
    // store them. New-style instance-bound definitions have one widget
    // object per widget instance; the definition that's passed in doesn't
    // provide renderValue or resize methods at all, just the single method
    //   factory(el, width, height)
    // which returns an object that has renderValue(x) and resize(w, h).
    // This enables a far more natural programming style for the widget
    // author, who can store per-instance state using either OO-style
    // instance fields or functional-style closure variables (I guess this
    // is in contrast to what can only be called C-style pseudo-OO which is
    // what we required before).
    if (definition.factory) {
      definition = createLegacyDefinitionAdapter(definition);
    }

    if (!definition.renderValue) {
      throw new Error("Widget must have a renderValue function");
    }

    // For static rendering (non-Shiny), use a simple widget registration
    // scheme. We also use this scheme for Shiny apps/documents that also
    // contain static widgets.
    window.HTMLWidgets.widgets = window.HTMLWidgets.widgets || [];
    // Merge defaults into the definition; don't mutate the original definition.
    var staticBinding = extend({}, defaults, definition);
    overrideMethod(staticBinding, "find", function(superfunc) {
      return function(scope) {
        var results = superfunc(scope);
        // Filter out Shiny outputs, we only want the static kind
        return filterByClass(results, "html-widget-output", false);
      };
    });
    window.HTMLWidgets.widgets.push(staticBinding);

    if (shinyMode) {
      // Shiny is running. Register the definition with an output binding.
      // The definition itself will not be the output binding, instead
      // we will make an output binding object that delegates to the
      // definition. This is because we foolishly used the same method
      // name (renderValue) for htmlwidgets definition and Shiny bindings
      // but they actually have quite different semantics (the Shiny
      // bindings receive data that includes lots of metadata that it
      // strips off before calling htmlwidgets renderValue). We can't
      // just ignore the difference because in some widgets it's helpful
      // to call this.renderValue() from inside of resize(), and if
      // we're not delegating, then that call will go to the Shiny
      // version instead of the htmlwidgets version.

      // Merge defaults with definition, without mutating either.
      var bindingDef = extend({}, defaults, definition);

      // This object will be our actual Shiny binding.
      var shinyBinding = new Shiny.OutputBinding();

      // With a few exceptions, we'll want to simply use the bindingDef's
      // version of methods if they are available, otherwise fall back to
      // Shiny's defaults. NOTE: If Shiny's output bindings gain additional
      // methods in the future, and we want them to be overrideable by
      // HTMLWidget binding definitions, then we'll need to add them to this
      // list.
      delegateMethod(shinyBinding, bindingDef, "getId");
      delegateMethod(shinyBinding, bindingDef, "onValueChange");
      delegateMethod(shinyBinding, bindingDef, "onValueError");
      delegateMethod(shinyBinding, bindingDef, "renderError");
      delegateMethod(shinyBinding, bindingDef, "clearError");
      delegateMethod(shinyBinding, bindingDef, "showProgress");

      // The find, renderValue, and resize are handled differently, because we
      // want to actually decorate the behavior of the bindingDef methods.

      shinyBinding.find = function(scope) {
        var results = bindingDef.find(scope);

        // Only return elements that are Shiny outputs, not static ones
        var dynamicResults = results.filter(".html-widget-output");

        // It's possible that whatever caused Shiny to think there might be
        // new dynamic outputs, also caused there to be new static outputs.
        // Since there might be lots of different htmlwidgets bindings, we
        // schedule execution for later--no need to staticRender multiple
        // times.
        if (results.length !== dynamicResults.length)
          scheduleStaticRender();

        return dynamicResults;
      };

      // Wrap renderValue to handle initialization, which unfortunately isn't
      // supported natively by Shiny at the time of this writing.

      shinyBinding.renderValue = function(el, data) {
        // Resolve strings marked as javascript literals to objects
        if (!(data.evals instanceof Array)) data.evals = [data.evals];
        for (var i = 0; data.evals && i < data.evals.length; i++) {
          window.HTMLWidgets.evaluateStringMember(data.x, data.evals[i]);
        }
        if (!bindingDef.renderOnNullValue) {
          if (data.x === null) {
            el.style.visibility = "hidden";
            return;
          } else {
            el.style.visibility = "inherit";
          }
        }
        if (!elementData(el, "initialized")) {
          initSizing(el);

          elementData(el, "initialized", true);
          if (bindingDef.initialize) {
            var result = bindingDef.initialize(el, el.offsetWidth,
              el.offsetHeight);
            elementData(el, "init_result", result);
          }
          evalAndRun(data.jsHooks.render, elementData(el, "init_result"), [el, data.x]);
        }
        Shiny.renderDependencies(data.deps);
        bindingDef.renderValue(el, data.x, elementData(el, "init_result"));
      };

      // Only override resize if bindingDef implements it
      if (bindingDef.resize) {
        shinyBinding.resize = function(el, width, height) {
          // Shiny can call resize before initialize/renderValue have been
          // called, which doesn't make sense for widgets.
          if (elementData(el, "initialized")) {
            bindingDef.resize(el, width, height, elementData(el, "init_result"));
          }
        };
      }

      Shiny.outputBindings.register(shinyBinding, bindingDef.name);
    }
  };

  var scheduleStaticRenderTimerId = null;
  function scheduleStaticRender() {
    if (!scheduleStaticRenderTimerId) {
      scheduleStaticRenderTimerId = setTimeout(function() {
        scheduleStaticRenderTimerId = null;
        window.HTMLWidgets.staticRender();
      }, 1);
    }
  }

  // Render static widgets after the document finishes loading
  // Statically render all elements that are of this widget's class
  window.HTMLWidgets.staticRender = function() {
    var bindings = window.HTMLWidgets.widgets || [];
    forEach(bindings, function(binding) {
      var matches = binding.find(document.documentElement);
      forEach(matches, function(el) {
        var sizeObj = initSizing(el, binding);

        if (hasClass(el, "html-widget-static-bound"))
          return;
        el.className = el.className + " html-widget-static-bound";

        var initResult;
        if (binding.initialize) {
          initResult = binding.initialize(el,
            sizeObj ? sizeObj.getWidth() : el.offsetWidth,
            sizeObj ? sizeObj.getHeight() : el.offsetHeight
          );
          elementData(el, "init_result", initResult);
        }

        if (binding.resize) {
          var lastSize = {};
          var resizeHandler = function(e) {
            var size = {
              w: sizeObj ? sizeObj.getWidth() : el.offsetWidth,
              h: sizeObj ? sizeObj.getHeight() : el.offsetHeight
            };
            if (size.w === 0 && size.h === 0)
              return;
            if (size.w === lastSize.w && size.h === lastSize.h)
              return;
            lastSize = size;
            binding.resize(el, size.w, size.h, initResult);
          };

          on(window, "resize", resizeHandler);

          // This is needed for cases where we're running in a Shiny
          // app, but the widget itself is not a Shiny output, but
          // rather a simple static widget. One example of this is
          // an rmarkdown document that has runtime:shiny and widget
          // that isn't in a render function. Shiny only knows to
          // call resize handlers for Shiny outputs, not for static
          // widgets, so we do it ourselves.
          if (window.jQuery) {
            window.jQuery(document).on(
              "shown.htmlwidgets shown.bs.tab.htmlwidgets shown.bs.collapse.htmlwidgets",
              resizeHandler
            );
            window.jQuery(document).on(
              "hidden.htmlwidgets hidden.bs.tab.htmlwidgets hidden.bs.collapse.htmlwidgets",
              resizeHandler
            );
          }

          // This is needed for the specific case of ioslides, which
          // flips slides between display:none and display:block.
          // Ideally we would not have to have ioslide-specific code
          // here, but rather have ioslides raise a generic event,
          // but the rmarkdown package just went to CRAN so the
          // window to getting that fixed may be long.
          if (window.addEventListener) {
            // It's OK to limit this to window.addEventListener
            // browsers because ioslides itself only supports
            // such browsers.
            on(document, "slideenter", resizeHandler);
            on(document, "slideleave", resizeHandler);
          }
        }

        var scriptData = document.querySelector("script[data-for='" + el.id + "'][type='application/json']");
        if (scriptData) {
          var data = JSON.parse(scriptData.textContent || scriptData.text);
          // Resolve strings marked as javascript literals to objects
          if (!(data.evals instanceof Array)) data.evals = [data.evals];
          for (var k = 0; data.evals && k < data.evals.length; k++) {
            window.HTMLWidgets.evaluateStringMember(data.x, data.evals[k]);
          }
          binding.renderValue(el, data.x, initResult);
          evalAndRun(data.jsHooks.render, initResult, [el, data.x]);
        }
      });
    });

    invokePostRenderHandlers();
  }

  // Wait until after the document has loaded to render the widgets.
  if (document.addEventListener) {
    document.addEventListener("DOMContentLoaded", function() {
      document.removeEventListener("DOMContentLoaded", arguments.callee, false);
      window.HTMLWidgets.staticRender();
    }, false);
  } else if (document.attachEvent) {
    document.attachEvent("onreadystatechange", function() {
      if (document.readyState === "complete") {
        document.detachEvent("onreadystatechange", arguments.callee);
        window.HTMLWidgets.staticRender();
      }
    });
  }


  window.HTMLWidgets.getAttachmentUrl = function(depname, key) {
    // If no key, default to the first item
    if (typeof(key) === "undefined")
      key = 1;

    var link = document.getElementById(depname + "-" + key + "-attachment");
    if (!link) {
      throw new Error("Attachment " + depname + "/" + key + " not found in document");
    }
    return link.getAttribute("href");
  };

  window.HTMLWidgets.dataframeToD3 = function(df) {
    var names = [];
    var length;
    for (var name in df) {
        if (df.hasOwnProperty(name))
            names.push(name);
        if (typeof(df[name]) !== "object" || typeof(df[name].length) === "undefined") {
            throw new Error("All fields must be arrays");
        } else if (typeof(length) !== "undefined" && length !== df[name].length) {
            throw new Error("All fields must be arrays of the same length");
        }
        length = df[name].length;
    }
    var results = [];
    var item;
    for (var row = 0; row < length; row++) {
        item = {};
        for (var col = 0; col < names.length; col++) {
            item[names[col]] = df[names[col]][row];
        }
        results.push(item);
    }
    return results;
  };

  window.HTMLWidgets.transposeArray2D = function(array) {
      if (array.length === 0) return array;
      var newArray = array[0].map(function(col, i) {
          return array.map(function(row) {
              return row[i]
          })
      });
      return newArray;
  };
  // Split value at splitChar, but allow splitChar to be escaped
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<link href="data:text/css;charset=utf-8,%2Esunburst%2Dmain%20%7B%0Awidth%3A%2090%25%3B%0Aheight%3A%20100%25%3B%0A%7D%0A%2Esunburst%2Dsidebar%20%7B%0Aposition%3A%20absolute%3B%0Aright%3A%2010px%3B%0Atop%3A%2010px%3B%0A%7D%0A%2Esunburst%2Dsequence%20%7B%0Awidth%3A%20100%25%3B%0Aposition%3A%20absolute%3B%0Atop%3A%200px%3B%0Aleft%3A%200px%3B%0Apointer%2Devents%3A%20none%3B%0A%7D%0A%2Esunburst%2Dlegend%20%7B%0Apadding%3A%2010px%200%200%203px%3B%0A%7D%0A%2Esunburst%2Dchart%20%7B%0Awidth%3A%20100%25%3B%0Aheight%3A%20100%25%3B%0Aposition%3A%20absolute%3B%0Atop%3A%2070px%3B%0A%7D%0A%2Esunburst%2Dchart%20path%20%7B%0Astroke%3A%20%23fff%3B%0A%7D%0A%2Esunburst%2Dexplanation%20%7B%0Aposition%3A%20absolute%3B%0Atext%2Dalign%3A%20center%3B%0Acolor%3A%20%23666%3B%0Az%2Dindex%3A%20999%3B%0Afont%2Dsize%3A%202em%3B%0Apointer%2Devents%3A%20none%3B%0A%7D%0A" rel="stylesheet" />
<script src="data:application/x-javascript;base64,HTMLWidgets.widget({

  name: 'sunburst',

  type: 'output',

  factory: function(el, width, height) {

    var instance = {};

    instance.chart = {};

    var dispatch = d3.dispatch("mouseover","mouseleave","click");

    d3.rebind(instance.chart, dispatch, 'on');

    var draw = function(el, instance) {

      // would be much nicer to implement transitions/animation
      // remove previous in case of Shiny/dynamic
      d3.select(el).select(".sunburst-chart svg").remove();

      var x = instance.x;
      var json = instance.json;
      var chart = instance.chart;

      // Dimensions of sunburst
      var width = el.getBoundingClientRect().width - (x.options.legend.w ? x.options.legend.w : 75);
      var height = el.getBoundingClientRect().height - 70;
      var radius = Math.min(width, height) / 2;

      d3.select(el).select(".sunburst-chart").append("svg")
        .style("width", width + "px") // shouldnt have to do this
        .style("height", height + "px"); // shouldnt have to do this

      // Breadcrumb dimensions: width, height, spacing, width of tip/tail.
      //  these will be the defaults
      var b = {
        w: 0, h: 30, s: 3, t: 10
      };
      //  if breadcrumb is provided in the option, we will overwrite
      //   with what is provided
      Object.keys(x.options.breadcrumb).map(function(ky){
        b[ky] = x.options.breadcrumb[ky];
      });
  /*
      // Mapping of step names to colors.
      var colors = {
        "home": "#5687d1",
        "product": "#7b615c",
        "search": "#de783b",
        "account": "#6ab975",
        "other": "#a173d1",
        "end": "#bbbbbb"
      };
  */

      var colors = d3.scale.category20();

      if(x.options.colors !== null){
        // if an array then we assume the colors
        //  represent an array of hexadecimal colors to be used
        if(Array.isArray(x.options.colors)) {
          try{
            colors.range(x.options.colors)
          } catch(e) {

          }
        }

        // if an object with range then we assume
        //  that this is an array of colors to be used as range
        if(x.options.colors.range){
          try{
            colors.range(x.options.colors.range)
          } catch(e) {

          }
        }

        // if an object with domain then we assume
        //  that this is an array of colors to be used as domain
        //  for more precise control of the colors assigned
        if(x.options.colors.domain){
          try{
            colors.domain(x.options.colors.domain);
          } catch(e) {

          }
        }
      }
      // Total size of all segments; we set this later, after loading the data.
      var totalSize = 0;

      var vis = d3.select(el).select(".sunburst-chart").select("svg")
          .append("g")
          .attr("id", el.id + "-container")
          .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

      var partition = d3.layout.partition()
          .size([2 * Math.PI, radius * radius])
          .value(function(d) { return d.size; });

      // check for sort function
      if(x.options.sortFunction){
        partition.sort(x.options.sortFunction);
      }

      var arc = d3.svg.arc()
          .startAngle(function(d) { return d.x; })
          .endAngle(function(d) { return d.x + d.dx; })
          .innerRadius(function(d) { return Math.sqrt(d.y); })
          .outerRadius(function(d) { return Math.sqrt(d.y + d.dy); });

      createVisualization(json);

      // set up a container for tasks to perform after completion
      //  one example would be add callbacks for event handling
      //  styling
      if (!(typeof x.tasks === "undefined") ){
        if ( (typeof x.tasks.length === "undefined") ||
         (typeof x.tasks === "function" ) ) {
           // handle a function not enclosed in array
           // should be able to remove once using jsonlite
           x.tasks = [x.tasks];
        }
        x.tasks.map(function(t){
          // for each tasks call the task with el supplied as `this`
          t.call({el:el,x:x,instance:instance});
        });
      }

      // Main function to draw and set up the visualization, once we have the data.
      function createVisualization(json) {

        // Basic setup of page elements.
        initializeBreadcrumbTrail();

        // Bounding circle underneath the sunburst, to make it easier to detect
        // when the mouse leaves the parent g.
        vis.append("circle")
            .attr("r", radius)
            .style("opacity", 0);

        // For efficiency, filter nodes to keep only those large enough to see.
        var nodes = partition.nodes(json)
            .filter(function(d) {
            return (d.dx > 0.005); // 0.005 radians = 0.29 degrees
            });

        var path = vis.data([json]).selectAll("path")
            .data(nodes)
            .enter().append("path")
            .attr("display", function(d) { return d.depth ? null : "none"; })
            .attr("d", arc)
            .attr("fill-rule", "evenodd")
            .style("fill", function(d) { return colors(d.name); })
            .style("opacity", 1)
            .on("mouseover", mouseover)
            .on("click", click);

        // Add the mouseleave handler to the bounding circle.
        d3.select(el).select("#"+ el.id + "-container").on("mouseleave", mouseleave);

        // Get total size of the tree = value of root node from partition.
        totalSize = path.node().__data__.value;

        drawLegend();
        d3.select(el).select(".sunburst-togglelegend").on("click", toggleLegend);

       }

      // Fade all but the current sequence, and show it in the breadcrumb trail.
      function mouseover(d) {

        var percentage = (100 * d.value / totalSize).toPrecision(3);
        var percentageString = percentage + "%";
        if (percentage < 0.1) {
          percentageString = "< 0.1%";
        }

        var countString = [
            '<span style = "font-size:.7em">',
            d3.format("1.2s")(d.value) + ' of ' + d3.format("1.2s")(totalSize),
            '</span>'
          ].join('')

        var explanationString = "";
        if(x.options.percent && x.options.count){
          explanationString = percentageString + '<br/>' + countString;
        } else if(x.options.percent){
          explanationString = percentageString;
        } else if(x.options.count){
          explanationString = countString;
        }

        //if explanation defined in R then use this instead
        if(x.options.explanation !== null){
          explanationString = x.options.explanation.bind(totalSize)(d);
        }


        d3.select(el).selectAll(".sunburst-explanation")
            .style("visibility", "")
            .style("top",((height - 70)/2) + "px")
            .style("width",width + "px")
            .html(explanationString);

        var sequenceArray = getAncestors(d);

        chart._selection = sequenceArray.map(
          function(d){return d.name}
        );
        dispatch.mouseover(chart._selection);

        updateBreadcrumbs(sequenceArray, percentageString);

        // Fade all the segments.
        d3.select(el).selectAll("path")
            .style("opacity", 0.3);

        // Then highlight only those that are an ancestor of the current segment.
        vis.selectAll("path")
            .filter(function(node) {
                      return (sequenceArray.indexOf(node) >= 0);
                    })
            .style("opacity", 1);
      }

      // Restore everything to full opacity when moving off the visualization.
      function mouseleave(d) {

        dispatch.mouseleave(chart._selection);
        chart._selection = [];

        // Hide the breadcrumb trail
        d3.select(el).select("#" + el.id + "-trail")
            .style("visibility", "hidden");

        // Deactivate all segments during transition.
        d3.select(el).selectAll("path").on("mouseover", null);

        // Transition each segment to full opacity and then reactivate it.
        d3.select(el).selectAll("path")
            .transition()
            .duration(1000)
            .style("opacity", 1)
            .each("end", function() {
              d3.select(this).on("mouseover", mouseover);
            });

        d3.select(el).selectAll(".sunburst-explanation")
            .style("visibility", "hidden");
      }

      function click(d,i) {
        var sequenceArray = getAncestors(d);

        dispatch.click(sequenceArray.map(
          function(d){return d.name}
        ));
      }

      // Given a node in a partition layout, return an array of all of its ancestor
      // nodes, highest first, but excluding the root.
      function getAncestors(node) {
        var path = [];
        var current = node;
        while (current.parent) {
          path.unshift(current);
          current = current.parent;
        }
        return path;
      }

      function initializeBreadcrumbTrail() {
        // Add the svg area.
        var trail = d3.select(el).select(".sunburst-sequence").append("svg")
            .attr("width", width)
            //.attr("height", 50)
            .attr("id", el.id + "-trail");
        // Add the label at the end, for the percentage.
        trail.append("text")
          .attr("id", el.id + "-endlabel")
          .style("fill", "#000");
      }

      // Generate a string that describes the points of a breadcrumb polygon.
      function breadcrumbPoints(d, i) {
        var points = [];
        points.push("0,0");
        if (b.w <= 0) {
          // calculate breadcrumb width based on string length
          points.push(d.string_length + ",0");
          points.push(d.string_length + b.t + "," + (b.h / 2));
          points.push(d.string_length + "," + b.h);
        } else {
          points.push(b.w + ",0");
          points.push(b.w + b.t + "," + (b.h / 2));
          points.push(b.w + "," + b.h);
        }
        points.push("0," + b.h);

        if (i > 0) { // Leftmost breadcrumb; don't include 6th vertex.
          points.push(b.t + "," + (b.h / 2));
        }
        return points.join(" ");
      }

      // Update the breadcrumb trail to show the current sequence and percentage.
      function updateBreadcrumbs(nodeArray, percentageString) {

        // Data join; key function combines name and depth (= position in sequence).
        var g = d3.select(el).select("#" + el.id + "-trail")
            .selectAll("g")
            .data(nodeArray, function(d) { return d.name + d.depth; });

        // Add breadcrumb and label for entering nodes.
        var entering = g.enter().append("g");


        if (b.w <= 0) {
          // Create a node array that contains all the breadcrumb widths
          // Calculate positions of breadcrumbs based on string lengths
          var curr_breadcrumb_x = 0;
          nodeArray[0].breadcrumb_x = 0;
          nodeArray[0].breadcrumb_h = 0;

          entering.append("polygon")
              .style("z-index",function(d,i) { return(999-i); })
              .style("fill", function(d) { return colors(d.name); });

          entering.append("text")
              .attr("x", b.t + 2)
              .attr("y", b.h / 2)
              .attr("dy", "0.35em")
              .attr("text-anchor", "left")
              .text(function(d) { return d.name; });

          // Remove exiting nodes.
          g.exit().remove();

          // loop through each g element
          //  calculate string length
          //  draw the breadcrumb polygon
          //  and determine if breadcrumb should be wrapped to next row
          g.each(function(d,k){
            var crumbg = d3.select(this);
            var my_string_length = crumbg.select("text").node().getBoundingClientRect().width;
            nodeArray[k].string_length = my_string_length + 12;
            crumbg.select("polygon").attr("points", function(d){
              return breadcrumbPoints(d, k);
            });
            var my_g_length = crumbg.node().getBoundingClientRect().width;
            curr_breadcrumb_x += k===0 ? 0 : nodeArray[k-1].string_length + b.s;
            nodeArray[k].breadcrumb_h = k===0 ? 0 : nodeArray[k-1].breadcrumb_h;

            if (curr_breadcrumb_x + my_g_length > width*0.99) {
              nodeArray[k].breadcrumb_h += b.h;  // got to next line
              curr_breadcrumb_x = b.t + b.s;     // restart counter
            }
            nodeArray[k].breadcrumb_x = curr_breadcrumb_x;
          });


          // Set position for entering and updating nodes.
          g.attr("transform", function(d, i) {
            return "translate(" + d.breadcrumb_x + ", "+d.breadcrumb_h+")";
          });


          // Now move and update the percentage at the end.
          d3.select(el).select("#" + el.id + "-trail").select("#" + el.id + "-endlabel")
              .attr("x", function(d){
                var bend = d3.select(this);
                var curr_breadcrumb_x = nodeArray[nodeArray.length-1].breadcrumb_x +  nodeArray[nodeArray.length-1].string_length + b.t + b.s;
                var my_g_length = bend.node().getBoundingClientRect().width;

                var curr_breadcrumb_h = nodeArray[nodeArray.length-1].breadcrumb_h + b.h/2;
                if (curr_breadcrumb_x + my_g_length > width*0.99) {
                  curr_breadcrumb_h += b.h + b.h/2;
                  curr_breadcrumb_x = b.t + b.s;     // restart counter
                }
                bend.datum({
                  "breadcrumb_x": curr_breadcrumb_x,
                  "breadcrumb_h": curr_breadcrumb_h
                });
                return curr_breadcrumb_x;
              })
              .attr("y", function(d){return d.breadcrumb_h})
              .attr("dy", "0.35em")
              .attr("text-anchor", "start")
              .text(percentageString);


        } else {
          entering.append("polygon")
              .attr("points", breadcrumbPoints)
              .style("fill", function(d) { return colors(d.name); });

          entering.append("text")
              .attr("x", (b.w + b.t) / 2)
              .attr("y", b.h / 2)
              .attr("dy", "0.35em")
              .attr("text-anchor", "middle")
              .text(function(d) { return d.name; });

          // Set position for entering and updating nodes.
          g.attr("transform", function(d, i) {
            return "translate(" + i * (b.w + b.s) + ", 0)";
          });

          // Remove exiting nodes.
          g.exit().remove();

          // Now move and update the percentage at the end.
          d3.select(el).select("#" + el.id + "-trail").select("#" + el.id + "-endlabel")
              .attr("x", (nodeArray.length + 0.5) * (b.w + b.s))
              .attr("y", b.h / 2)
              .attr("dy", "0.35em")
              .attr("text-anchor", "middle")
              .text(percentageString);

        }

        // Make the breadcrumb trail visible, if it's hidden.
        d3.select(el).select("#" + el.id + "-trail")
            .style("visibility", "");

      }

      function drawLegend() {

        // Dimensions of legend item: width, height, spacing, radius of rounded rect.
        var li = {
          w: 75, h: 30, s: 3, r: 3
        };

        //  if legend is provided in the option, we will overwrite
        //   with what is provided
        Object.keys(x.options.legend).map(function(ky){
          li[ky] = x.options.legend[ky];
        });

        // remove if already drawn
        d3.select(el).select(".sunburst-legend svg").remove();

        var legend = d3.select(el).select(".sunburst-legend").append("svg")
            .attr("width", li.w)
            .attr("height", colors.domain().length * (li.h + li.s));

        var g = legend.selectAll("g")
            .data( function(){
              if(x.options.legendOrder !== null){
                return x.options.legendOrder;
              } else {
                // get sorted by top level
                sortedname = d3.set(Object.keys(d3.nest().key(function(d){return d.name}).rollup(function(d){return d[0].value}).map(json.children) ))
                // add any other missing
                colors.domain()
                  .filter(function(d){
                    return d !== json.name;
                  })
                  .forEach(function(d){
                    sortedname.add(d)
                  })
                return sortedname.values();
              }
            })
            .enter().append("g")
            .attr("transform", function(d, i) {
                    return "translate(0," + i * (li.h + li.s) + ")";
                 });

        g.append("rect")
            .attr("rx", li.r)
            .attr("ry", li.r)
            .attr("width", li.w)
            .attr("height", li.h)
            .style("fill", function(d) { return colors(d); });

        g.append("text")
            .attr("x", li.w / 2)
            .attr("y", li.h / 2)
            .attr("dy", "0.35em")
            .attr("text-anchor", "middle")
            .text(function(d) { return d; });
      }

      function toggleLegend() {
        var legend = d3.select(el).select(".sunburst-legend")
        if (legend.style("visibility") == "hidden") {
          legend.style("visibility", "");
        } else {
          legend.style("visibility", "hidden");
        }
      }
    };

    // Take a 2-column CSV and transform it into a hierarchical structure suitable
    // for a partition layout. The first column is a sequence of step names, from
    // root to leaf, separated by hyphens. The second column is a count of how
    // often that sequence occurred.
    function buildHierarchy(csv) {
      var root = {"name": "root", "children": []};
      for (var i = 0; i < csv.length; i++) {
        var sequence = csv[i][0];
        var size = +csv[i][1];
        if (isNaN(size)) { // e.g. if this is a header row
          continue;
        }
        var parts = sequence.split("-");
        var currentNode = root;
        for (var j = 0; j < parts.length; j++) {
          var children = currentNode["children"];
          var nodeName = parts[j];
          var childNode;
          if (j + 1 < parts.length) {
       // Not yet at the end of the sequence; move down the tree.
     	var foundChild = false;
     	for (var k = 0; k < children.length; k++) {
     	  if (children[k]["name"] == nodeName) {
     	    childNode = children[k];
     	    foundChild = true;
     	    break;
     	  }
     	}
      // If we don't already have a child node for this branch, create it.
     	if (!foundChild) {
     	  childNode = {"name": nodeName, "children": []};
     	  children.push(childNode);
     	}
     	currentNode = childNode;
          } else {
     	// Reached the end of the sequence; create a leaf node.
     	childNode = {"name": nodeName, "size": size};
     	children.push(childNode);
          }
        }
      }
      return root;

    };

    return {

      renderValue: function(x) {

        instance.x = x;

        // x.data should be a data.frame in R so an Javascript Object of Objects
        //     but buildHierarchy expects an Array of Arrays
        //     so use d3.zip and apply to do this
        var json = [];
        if(x.csvdata !== null){
          json = buildHierarchy(
            d3.zip.apply(
              null,
              Object.keys(x.csvdata).map(function(ky){return x.csvdata[ky]})
            )
          );
        } else {
          json = x.jsondata
        }
        instance.json = json;

        draw(el, instance);

      },

      resize: function(width, height) {

        draw(el, instance);

      },

      instance: instance

    };
  }
});
"></script>
</head>
<body style="background-color:white;">
<div id="htmlwidget_container">
<div id="htmlwidget-d609e74b8607ef292b96" class="sunburst html-widget" style="width:960px;height:500px; position:relative;">
<div>
<div class="sunburst-main">
<div class="sunburst-sequence"></div>
<div class="sunburst-chart">
<div class="sunburst-explanation" style="visibility:hidden;"></div>
</div>
</div>
<div class="sunburst-sidebar">
<input type="checkbox" class="sunburst-togglelegend">Legend</input>
<div class="sunburst-legend" style="visibility:hidden;"></div>
</div>
</div>
</div>
</div>
<script type="application/json" data-for="htmlwidget-d609e74b8607ef292b96">{"x":{"csvdata":{"all":["No-1st-Male-Child","No-2nd-Male-Child","No-3rd-Male-Child","No-Crew-Male-Child","No-1st-Female-Child","No-2nd-Female-Child","No-3rd-Female-Child","No-Crew-Female-Child","No-1st-Male-Adult","No-2nd-Male-Adult","No-3rd-Male-Adult","No-Crew-Male-Adult","No-1st-Female-Adult","No-2nd-Female-Adult","No-3rd-Female-Adult","No-Crew-Female-Adult","Yes-1st-Male-Child","Yes-2nd-Male-Child","Yes-3rd-Male-Child","Yes-Crew-Male-Child","Yes-1st-Female-Child","Yes-2nd-Female-Child","Yes-3rd-Female-Child","Yes-Crew-Female-Child","Yes-1st-Male-Adult","Yes-2nd-Male-Adult","Yes-3rd-Male-Adult","Yes-Crew-Male-Adult","Yes-1st-Female-Adult","Yes-2nd-Female-Adult","Yes-3rd-Female-Adult","Yes-Crew-Female-Adult"],"Freq":[0,0,35,0,0,0,17,0,118,154,387,670,4,13,89,3,5,11,13,0,1,13,14,0,57,14,75,192,140,80,76,20]},"jsondata":null,"options":{"legendOrder":null,"colors":null,"percent":true,"count":false,"explanation":null,"breadcrumb":[],"legend":[],"sortFunction":null}},"evals":[],"jsHooks":[]}</script>
<script type="application/htmlwidget-sizing" data-for="htmlwidget-d609e74b8607ef292b96">{"viewer":{"width":450,"height":350,"padding":15,"fill":true},"browser":{"width":960,"height":500,"padding":40,"fill":true}}</script>
</body>
</html>
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