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HTML

              
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>d3heatmap</title>
<script>(function() {
  // If window.HTMLWidgets is already defined, then use it; otherwise create a
  // new object. This allows preceding code to set options that affect the
  // initialization process (though none currently exist).
  window.HTMLWidgets = window.HTMLWidgets || {};

  // See if we're running in a viewer pane. If not, we're in a web browser.
  var viewerMode = window.HTMLWidgets.viewerMode =
      /\bviewer_pane=1\b/.test(window.location);

  // See if we're running in Shiny mode. If not, it's a static document.
  // Note that static widgets can appear in both Shiny and static modes, but
  // obviously, Shiny widgets can only appear in Shiny apps/documents.
  var shinyMode = window.HTMLWidgets.shinyMode =
      typeof(window.Shiny) !== "undefined" && !!window.Shiny.outputBindings;

  // We can't count on jQuery being available, so we implement our own
  // version if necessary.
  function querySelectorAll(scope, selector) {
    if (typeof(jQuery) !== "undefined" && scope instanceof jQuery) {
      return scope.find(selector);
    }
    if (scope.querySelectorAll) {
      return scope.querySelectorAll(selector);
    }
  }

  function asArray(value) {
    if (value === null)
      return [];
    if ($.isArray(value))
      return value;
    return [value];
  }

  // Implement jQuery's extend
  function extend(target /*, ... */) {
    if (arguments.length == 1) {
      return target;
    }
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];
      for (var prop in source) {
        if (source.hasOwnProperty(prop)) {
          target[prop] = source[prop];
        }
      }
    }
    return target;
  }

  // IE8 doesn't support Array.forEach.
  function forEach(values, callback, thisArg) {
    if (values.forEach) {
      values.forEach(callback, thisArg);
    } else {
      for (var i = 0; i < values.length; i++) {
        callback.call(thisArg, values[i], i, values);
      }
    }
  }

  // Replaces the specified method with the return value of funcSource.
  //
  // Note that funcSource should not BE the new method, it should be a function
  // that RETURNS the new method. funcSource receives a single argument that is
  // the overridden method, it can be called from the new method. The overridden
  // method can be called like a regular function, it has the target permanently
  // bound to it so "this" will work correctly.
  function overrideMethod(target, methodName, funcSource) {
    var superFunc = target[methodName] || function() {};
    var superFuncBound = function() {
      return superFunc.apply(target, arguments);
    };
    target[methodName] = funcSource(superFuncBound);
  }

  // Add a method to delegator that, when invoked, calls
  // delegatee.methodName. If there is no such method on
  // the delegatee, but there was one on delegator before
  // delegateMethod was called, then the original version
  // is invoked instead.
  // For example:
  //
  // var a = {
  //   method1: function() { console.log('a1'); }
  //   method2: function() { console.log('a2'); }
  // };
  // var b = {
  //   method1: function() { console.log('b1'); }
  // };
  // delegateMethod(a, b, "method1");
  // delegateMethod(a, b, "method2");
  // a.method1();
  // a.method2();
  //
  // The output would be "b1", "a2".
  function delegateMethod(delegator, delegatee, methodName) {
    var inherited = delegator[methodName];
    delegator[methodName] = function() {
      var target = delegatee;
      var method = delegatee[methodName];

      // The method doesn't exist on the delegatee. Instead,
      // call the method on the delegator, if it exists.
      if (!method) {
        target = delegator;
        method = inherited;
      }

      if (method) {
        return method.apply(target, arguments);
      }
    };
  }

  // Implement a vague facsimilie of jQuery's data method
  function elementData(el, name, value) {
    if (arguments.length == 2) {
      return el["htmlwidget_data_" + name];
    } else if (arguments.length == 3) {
      el["htmlwidget_data_" + name] = value;
      return el;
    } else {
      throw new Error("Wrong number of arguments for elementData: " +
        arguments.length);
    }
  }

  // http://stackoverflow.com/questions/3446170/escape-string-for-use-in-javascript-regex
  function escapeRegExp(str) {
    return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
  }

  function hasClass(el, className) {
    var re = new RegExp("\\b" + escapeRegExp(className) + "\\b");
    return re.test(el.className);
  }

  // elements - array (or array-like object) of HTML elements
  // className - class name to test for
  // include - if true, only return elements with given className;
  //   if false, only return elements *without* given className
  function filterByClass(elements, className, include) {
    var results = [];
    for (var i = 0; i < elements.length; i++) {
      if (hasClass(elements[i], className) == include)
        results.push(elements[i]);
    }
    return results;
  }

  function on(obj, eventName, func) {
    if (obj.addEventListener) {
      obj.addEventListener(eventName, func, false);
    } else if (obj.attachEvent) {
      obj.attachEvent(eventName, func);
    }
  }

  function off(obj, eventName, func) {
    if (obj.removeEventListener)
      obj.removeEventListener(eventName, func, false);
    else if (obj.detachEvent) {
      obj.detachEvent(eventName, func);
    }
  }

  // Translate array of values to top/right/bottom/left, as usual with
  // the "padding" CSS property
  // https://developer.mozilla.org/en-US/docs/Web/CSS/padding
  function unpackPadding(value) {
    if (typeof(value) === "number")
      value = [value];
    if (value.length === 1) {
      return {top: value[0], right: value[0], bottom: value[0], left: value[0]};
    }
    if (value.length === 2) {
      return {top: value[0], right: value[1], bottom: value[0], left: value[1]};
    }
    if (value.length === 3) {
      return {top: value[0], right: value[1], bottom: value[2], left: value[1]};
    }
    if (value.length === 4) {
      return {top: value[0], right: value[1], bottom: value[2], left: value[3]};
    }
  }

  // Convert an unpacked padding object to a CSS value
  function paddingToCss(paddingObj) {
    return paddingObj.top + "px " + paddingObj.right + "px " + paddingObj.bottom + "px " + paddingObj.left + "px";
  }

  // Makes a number suitable for CSS
  function px(x) {
    if (typeof(x) === "number")
      return x + "px";
    else
      return x;
  }

  // Retrieves runtime widget sizing information for an element.
  // The return value is either null, or an object with fill, padding,
  // defaultWidth, defaultHeight fields.
  function sizingPolicy(el) {
    var sizingEl = document.querySelector("script[data-for='" + el.id + "'][type='application/htmlwidget-sizing']");
    if (!sizingEl)
      return null;
    var sp = JSON.parse(sizingEl.textContent || sizingEl.text || "{}");
    if (viewerMode) {
      return sp.viewer;
    } else {
      return sp.browser;
    }
  }

  // @param tasks Array of strings (or falsy value, in which case no-op).
  //   Each element must be a valid JavaScript expression that yields a
  //   function. Or, can be an array of objects with "code" and "data"
  //   properties; in this case, the "code" property should be a string
  //   of JS that's an expr that yields a function, and "data" should be
  //   an object that will be added as an additional argument when that
  //   function is called.
  // @param target The object that will be "this" for each function
  //   execution.
  // @param args Array of arguments to be passed to the functions. (The
  //   same arguments will be passed to all functions.)
  function evalAndRun(tasks, target, args) {
    if (tasks) {
      forEach(tasks, function(task) {
        var theseArgs = args;
        if (typeof(task) === "object") {
          theseArgs = theseArgs.concat([task.data]);
          task = task.code;
        }
        var taskFunc = tryEval(task);
        if (typeof(taskFunc) !== "function") {
          throw new Error("Task must be a function! Source:\n" + task);
        }
        taskFunc.apply(target, theseArgs);
      });
    }
  }

  // Attempt eval() both with and without enclosing in parentheses.
  // Note that enclosing coerces a function declaration into
  // an expression that eval() can parse
  // (otherwise, a SyntaxError is thrown)
  function tryEval(code) {
    var result = null;
    try {
      result = eval(code);
    } catch(error) {
      if (!error instanceof SyntaxError) {
        throw error;
      }
      try {
        result = eval("(" + code + ")");
      } catch(e) {
        if (e instanceof SyntaxError) {
          throw error;
        } else {
          throw e;
        }
      }
    }
    return result;
  }

  function initSizing(el) {
    var sizing = sizingPolicy(el);
    if (!sizing)
      return;

    var cel = document.getElementById("htmlwidget_container");
    if (!cel)
      return;

    if (typeof(sizing.padding) !== "undefined") {
      document.body.style.margin = "0";
      document.body.style.padding = paddingToCss(unpackPadding(sizing.padding));
    }

    if (sizing.fill) {
      document.body.style.overflow = "hidden";
      document.body.style.width = "100%";
      document.body.style.height = "100%";
      document.documentElement.style.width = "100%";
      document.documentElement.style.height = "100%";
      if (cel) {
        cel.style.position = "absolute";
        var pad = unpackPadding(sizing.padding);
        cel.style.top = pad.top + "px";
        cel.style.right = pad.right + "px";
        cel.style.bottom = pad.bottom + "px";
        cel.style.left = pad.left + "px";
        el.style.width = "100%";
        el.style.height = "100%";
      }

      return {
        getWidth: function() { return cel.offsetWidth; },
        getHeight: function() { return cel.offsetHeight; }
      };

    } else {
      el.style.width = px(sizing.width);
      el.style.height = px(sizing.height);

      return {
        getWidth: function() { return el.offsetWidth; },
        getHeight: function() { return el.offsetHeight; }
      };
    }
  }

  // Default implementations for methods
  var defaults = {
    find: function(scope) {
      return querySelectorAll(scope, "." + this.name);
    },
    renderError: function(el, err) {
      var $el = $(el);

      this.clearError(el);

      // Add all these error classes, as Shiny does
      var errClass = "shiny-output-error";
      if (err.type !== null) {
        // use the classes of the error condition as CSS class names
        errClass = errClass + " " + $.map(asArray(err.type), function(type) {
          return errClass + "-" + type;
        }).join(" ");
      }
      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) {
        Shiny.renderDependencies(data.deps);
        // 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);
          }
        }
        bindingDef.renderValue(el, data.x, elementData(el, "init_result"));
        evalAndRun(data.jsHooks.render, elementData(el, "init_result"), [el, data.x]);
      };

      // 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 = {
            w: sizeObj ? sizeObj.getWidth() : el.offsetWidth,
            h: sizeObj ? sizeObj.getHeight() : el.offsetHeight
          };
          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();
  }


  function has_jQuery3() {
    if (!window.jQuery) {
      return false;
    }
    var $version = window.jQuery.fn.jquery;
    var $major_version = parseInt($version.split(".")[0]);
    return $major_version >= 3;
  }

  /*
  / Shiny 1.4 bumped jQuery from 1.x to 3.x which means jQuery's
  / on-ready handler (i.e., $(fn)) is now asyncronous (i.e., it now
  / really means $(setTimeout(fn)).
  / https://jquery.com/upgrade-guide/3.0/#breaking-change-document-ready-handlers-are-now-asynchronous
  /
  / Since Shiny uses $() to schedule initShiny, shiny>=1.4 calls initShiny
  / one tick later than it did before, which means staticRender() is
  / called renderValue() earlier than (advanced) widget authors might be expecting.
  / https://github.com/rstudio/shiny/issues/2630
  /
  / For a concrete example, leaflet has some methods (e.g., updateBounds)
  / which reference Shiny methods registered in initShiny (e.g., setInputValue).
  / Since leaflet is privy to this life-cycle, it knows to use setTimeout() to
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<style type="text/css">body.theme-dark {
background-color: #333 !important;
}
.link {
fill: none;
}
.theme-dark .link {
}
.d3heatmap {
position: relative;
width: 820px;
height: 700px;
overflow: hidden;
}
.d3heatmap .domain {
fill: none;
stroke: none;
}
.d3heatmap .axis {
overflow: hidden;
}
.d3heatmap .axis line {
fill: none;
stroke: #AAA;
stroke-width: 1px;
shape-rendering: crispEdges;
}
.d3heatmap .axis text, .d3heatmap-tip {
font-size: 15px;
font-family: Ubuntu Sans, Segoe UI, Lucida Grande, sans-serif;
}
.d3heatmap .axis rect {
cursor: pointer;
}
.inner {
position: relative;
}
.info {
position: absolute;
left: 20px;
top: 90px;
width: 160px;
height: 140px;
text-align: right;
font-size: 40px;
padding-top: 118px;
}
.d3heatmap text {
cursor: default;
}
.d3heatmap .brush .extent{
fill-opacity: 0.15;
stroke-width: 1px;
}
.colDend {
position: absolute;
overflow: hidden;
}
.rowDend {
position: absolute;
overflow: hidden;
}
.colormap {
position: absolute;
overflow: hidden;
}
.theme-dark text {
fill: #E2E2E2;
}
.highlighting .colormap .datapt {
opacity: 0.2;
}
.highlighting .colormap .datapt.highlight {
opacity: 1;
}
.highlighting .axis g.tick.faded {
opacity: 0.4 !important;
}
.d3heatmap-tip {
font-size: 13px;
color: white;
background-color: #444;
padding: 6px 12px;
box-shadow: 3px 3px 5px 0px rgba(0, 0, 0, 0.22);
}
.theme-dark .d3heatmap-tip {
background-color: white;
color: #444;
}
.d3heatmap-tip table {
border-collapse: separate;
border-spacing: 2px;
}
.d3heatmap-tip th, .d3heatmap-tip td {
padding: 0 1px;
}
</style>
<script>function heatmap(selector, data, options) {

  // ==== BEGIN HELPERS =================================
  
  function htmlEscape(str) {
    return (str+"").replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
  }
  
  // Given a list of widths/heights and a total width/height, provides
  // easy access to the absolute top/left/width/height of any individual
  // grid cell. Optionally, a single cell can be specified as a "fill"
  // cell, meaning it will take up any remaining width/height.
  // 
  // rows and cols are arrays that contain numeric pixel dimensions,
  // and up to one "*" value.
  function GridSizer(widths, heights, /*optional*/ totalWidth, /*optional*/ totalHeight) {
    this.widths = widths;
    this.heights = heights;
  
    var fillColIndex = null;
    var fillRowIndex = null;
    var usedWidth = 0;
    var usedHeight = 0;
    var i;
    for (i = 0; i < widths.length; i++) {
      if (widths[i] === "*") {
        if (fillColIndex !== null) {
          throw new Error("Only one column can be designated as fill");
        }
        fillColIndex = i;
      } else {
        usedWidth += widths[i];
      }
    }
    if (fillColIndex !== null) {
      widths[fillColIndex] = totalWidth - usedWidth;
    } else {
      if (typeof(totalWidth) === "number" && totalWidth !== usedWidth) {
        throw new Error("Column widths don't add up to total width");
      }
    }
    for (i = 0; i < heights.length; i++) {
      if (heights[i] === "*") {
        if (fillRowIndex !== null) {
          throw new Error("Only one row can be designated as fill");
        }
        fillRowIndex = i;
      } else {
        usedHeight += heights[i];
      }
    }
    if (fillRowIndex !== null) {
      heights[fillRowIndex] = totalHeight - usedHeight;
    } else {
      if (typeof(totalHeight) === "number" && totalHeight !== usedHeight) {
        throw new Error("Column heights don't add up to total height");
      }
    }
  }
  
  GridSizer.prototype.getCellBounds = function(x, y) {
    if (x < 0 || x >= this.widths.length || y < 0 || y >= this.heights.length)
      throw new Error("Invalid cell bounds");
  
    var left = 0;
    for (var i = 0; i < x; i++) {
      left += this.widths[i];
    }
  
    var top = 0;
    for (var j = 0; j < y; j++) {
      top += this.heights[j];
    }
  
    return {
      width: this.widths[x],
      height: this.heights[y],
      top: top,
      left: left
    }
  }
  
  // ==== END HELPERS ===================================


  var el = d3.select(selector);

  var bbox = el.node().getBoundingClientRect();

  var Controller = function() {
    this._events = d3.dispatch("highlight", "datapoint_hover", "transform");
    this._highlight = {x: null, y: null};
    this._datapoint_hover = {x: null, y: null, value: null};
    this._transform = null;
  };
  (function() {
    this.highlight = function(x, y) {
      // Copy for safety
      if (!arguments.length) return {x: this._highlight.x, y: this._highlight.y};

      if (arguments.length == 1) {
        this._highlight = x;
      } else {
        this._highlight = {x: x, y: y};
      }
      this._events.highlight.call(this, this._highlight);
    };

    this.datapoint_hover = function(_) {
      if (!arguments.length) return this._datapoint_hover;
      
      this._datapoint_hover = _;
      this._events.datapoint_hover.call(this, _);
    };

    this.transform = function(_) {
      if (!arguments.length) return this._transform;
      this._transform = _;
      this._events.transform.call(this, _);
    };

    this.on = function(evt, callback) {
      this._events.on(evt, callback);
    };
  }).call(Controller.prototype);

  var controller = new Controller();

  // Set option defaults
  var opts = {};
  options = options || {};
  opts.width = options.width || bbox.width;
  opts.height = options.height || bbox.height;
  opts.xclust_height = options.xclust_height || opts.height * 0.12;
  opts.yclust_width = options.yclust_width || opts.width * 0.12;
  opts.link_color = opts.link_color || "#AAA";
  opts.xaxis_height = options.xaxis_height || 80;
  opts.yaxis_width = options.yaxis_width || 120;
  opts.axis_padding = options.axis_padding || 6;
  opts.show_grid = options.show_grid;
  if (typeof(opts.show_grid) === 'undefined') {
    opts.show_grid = true;
  }
  opts.brush_color = options.brush_color || "#0000FF";
  opts.xaxis_font_size = options.xaxis_font_size;
  opts.yaxis_font_size = options.yaxis_font_size;
  opts.anim_duration = options.anim_duration;
  if (typeof(opts.anim_duration) === 'undefined') {
    opts.anim_duration = 500;
  }

  if (!data.rows) {
    opts.yclust_width = 0;
  }
  if (!data.cols) {
    opts.xclust_height = 0;
  }
  
  var gridSizer = new GridSizer(
    [opts.yclust_width, "*", opts.yaxis_width],
    [opts.xclust_height, "*", opts.xaxis_height],
    opts.width,
    opts.height
  );

  var colormapBounds = gridSizer.getCellBounds(1, 1);
  var colDendBounds = gridSizer.getCellBounds(1, 0);
  var rowDendBounds = gridSizer.getCellBounds(0, 1);
  var yaxisBounds = gridSizer.getCellBounds(2, 1);
  var xaxisBounds = gridSizer.getCellBounds(1, 2);

  function cssify(styles) {
    return {
      position: "absolute",
      top: styles.top + "px",
      left: styles.left + "px",
      width: styles.width + "px",
      height: styles.height + "px"
    };
  }

  // Create DOM structure
  (function() {
    var inner = el.append("div").classed("inner", true);
    var info = inner.append("div").classed("info", true);
    var colDend = inner.append("svg").classed("dendrogram colDend", true).style(cssify(colDendBounds));
    var rowDend = inner.append("svg").classed("dendrogram rowDend", true).style(cssify(rowDendBounds));
    var colmap = inner.append("svg").classed("colormap", true).style(cssify(colormapBounds));
    var xaxis = inner.append("svg").classed("axis xaxis", true).style(cssify(xaxisBounds));
    var yaxis = inner.append("svg").classed("axis yaxis", true).style(cssify(yaxisBounds));
    
    // Hack the width of the x-axis to allow x-overflow of rotated labels; the
    // QtWebkit viewer won't allow svg elements to overflow:visible.
    xaxis.style("width", (opts.width - opts.yclust_width) + "px");
    xaxis
      .append("defs")
        .append("clipPath").attr("id", "xaxis-clip")
          .append("polygon")
            .attr("points", "" + [
              [0, 0],
              [xaxisBounds.width, 0],
              [xaxisBounds.width + yaxisBounds.width, xaxisBounds.height],
              [0, xaxisBounds.height]
            ]);
    xaxis.node(0).setAttribute("clip-path", "url(#xaxis-clip)");

    inner.on("click", function() {
      controller.highlight(null, null);
    });
    controller.on('highlight.inner', function(hl) {
      inner.classed('highlighting',
        typeof(hl.x) === 'number' || typeof(hl.y) === 'number');
    });
  })();
  
  var row = !data.rows ? null : dendrogram(el.select('svg.rowDend'), data.rows, false, rowDendBounds.width, rowDendBounds.height, opts.axis_padding);
  var col = !data.cols ? null : dendrogram(el.select('svg.colDend'), data.cols, true, colDendBounds.width, colDendBounds.height, opts.axis_padding);
  var colormap = colormap(el.select('svg.colormap'), data.matrix, colormapBounds.width, colormapBounds.height);
  var xax = axisLabels(el.select('svg.xaxis'), data.cols || data.matrix.cols, true, xaxisBounds.width, xaxisBounds.height, opts.axis_padding);
  var yax = axisLabels(el.select('svg.yaxis'), data.rows || data.matrix.rows, false, yaxisBounds.width, yaxisBounds.height, opts.axis_padding);
  
  function colormap(svg, data, width, height) {
    // Check for no data
    if (data.length === 0)
      return function() {};

	if (!opts.show_grid) {
      svg.style("shape-rendering", "crispEdges");
	}
 
    var cols = data.dim[1];
    var rows = data.dim[0];
    
    var merged = data.merged;
    
    var x = d3.scale.linear().domain([0, cols]).range([0, width]);
    var y = d3.scale.linear().domain([0, rows]).range([0, height]);
    var tip = d3.tip()
        .attr('class', 'd3heatmap-tip')
        .html(function(d, i) {
          return "<table>" + 
            "<tr><th align=\"right\">Row</th><td>" + htmlEscape(data.rows[d.row]) + "</td></tr>" +
            "<tr><th align=\"right\">Column</th><td>" + htmlEscape(data.cols[d.col]) + "</td></tr>" +
            "<tr><th align=\"right\">Value</th><td>" + htmlEscape(d.label) + "</td></tr>" +
            "</table>";
        })
        .direction("se")
        .style("position", "fixed");
    
    var brush = d3.svg.brush()
        .x(x)
        .y(y)
        .clamp([true, true])
        .on('brush', function() {
          var extent = brush.extent();
          extent[0][0] = Math.round(extent[0][0]);
          extent[0][1] = Math.round(extent[0][1]);
          extent[1][0] = Math.round(extent[1][0]);
          extent[1][1] = Math.round(extent[1][1]);
          d3.select(this).call(brush.extent(extent));
        })
        .on('brushend', function() {

          if (brush.empty()) {
            controller.transform({
              scale: [1,1],
              translate: [0,0],
              extent: [[0,0],[cols,rows]]
            });
          } else {
            var tf = controller.transform();
            var ex = brush.extent();
            var scale = [
              cols / (ex[1][0] - ex[0][0]),
              rows / (ex[1][1] - ex[0][1])
            ];
            var translate = [
              ex[0][0] * (width / cols) * scale[0] * -1,
              ex[0][1] * (height / rows) * scale[1] * -1
            ];
            controller.transform({scale: scale, translate: translate, extent: ex});
          }
          brush.clear();
          d3.select(this).call(brush).select(".brush .extent")
              .style({fill: opts.brush_color, stroke: opts.brush_color});
        });

    svg = svg
        .attr("width", width)
        .attr("height", height);
    var rect = svg.selectAll("rect").data(merged);
    rect.enter().append("rect").classed("datapt", true)
        .property("colIndex", function(d, i) { return i % cols; })
        .property("rowIndex", function(d, i) { return Math.floor(i / cols); })
        .property("value", function(d, i) { return d.value; })
        .attr("fill", function(d) {
          if (!d.color) {
            return "transparent";
          }
          return d.color;
        });
    rect.exit().remove();
    rect.append("title")
        .text(function(d, i) { return d.label; });
    rect.call(tip);

    var spacing;
    if (typeof(opts.show_grid) === 'number') {
      spacing = opts.show_grid;
    } else if (!!opts.show_grid) {
      spacing = 0.25;
    } else {
      spacing = 0;
    }
    function draw(selection) {
      selection
          .attr("x", function(d, i) {
            return x(i % cols);
          })
          .attr("y", function(d, i) {
            return y(Math.floor(i / cols));
          })
          .attr("width", (x(1) - x(0)) - spacing)
          .attr("height", (y(1) - y(0)) - spacing);
    }

    draw(rect);

    controller.on('transform.colormap', function(_) {
      x.range([_.translate[0], width * _.scale[0] + _.translate[0]]);
      y.range([_.translate[1], height * _.scale[1] + _.translate[1]]);
      draw(rect.transition().duration(opts.anim_duration).ease("linear"));
    });
    

    var brushG = svg.append("g")
        .attr('class', 'brush')
        .call(brush)
        .call(brush.event);
    brushG.select("rect.background")
        .on("mouseenter", function() {
          tip.style("display", "block");
        })
        .on("mousemove", function() {
          var e = d3.event;
          var offsetX = d3.event.offsetX;
          var offsetY = d3.event.offsetY;
          if (typeof(offsetX) === "undefined") {
            // Firefox 38 and earlier
            var target = e.target || e.srcElement;
            var rect = target.getBoundingClientRect();
            offsetX = e.clientX - rect.left,
            offsetY = e.clientY - rect.top;
          }
          
          var col = Math.floor(x.invert(offsetX));
          var row = Math.floor(y.invert(offsetY));
          var label = merged[row*cols + col].label;
          tip.show({col: col, row: row, label: label}).style({
            top: d3.event.clientY + 15 + "px",
            left: d3.event.clientX + 15 + "px",
            opacity: 0.9
          });
          controller.datapoint_hover({col:col, row:row, label:label});
        })
        .on("mouseleave", function() {
          tip.hide().style("display", "none");
          controller.datapoint_hover(null);
        });

    controller.on('highlight.datapt', function(hl) {
      rect.classed('highlight', function(d, i) {
        return (this.rowIndex === hl.y) || (this.colIndex === hl.x);
      });
    });
  }

  function axisLabels(svg, data, rotated, width, height, padding) {
    svg = svg.append('g');

    // The data variable is either cluster info, or a flat list of names.
    // If the former, transform it to simply a list of names.
    var leaves;
    if (data.children) {
      leaves = d3.layout.cluster().nodes(data)
          .filter(function(x) { return !x.children; })
          .map(function(x) { return x.label + ""; });
    } else if (data.length) {
      leaves = data;
    }
    
    // Define scale, axis
    var scale = d3.scale.ordinal()
        .domain(leaves)
        .rangeBands([0, rotated ? width : height]);
    var axis = d3.svg.axis()
        .scale(scale)
        .orient(rotated ? "bottom" : "right")
        .outerTickSize(0)
        .tickPadding(padding)
        .tickValues(leaves);

    // Create the actual axis
    var axisNodes = svg.append("g")
        .attr("transform", rotated ? "translate(0," + padding + ")" : "translate(" + padding + ",0)")
        .call(axis);
    var fontSize = opts[(rotated ? 'x' : 'y') + 'axis_font_size']
        || Math.min(18, Math.max(9, scale.rangeBand() - (rotated ? 11: 8))) + "px";
    axisNodes.selectAll("text").style("font-size", fontSize);
    
    var mouseTargets = svg.append("g")
      .selectAll("g").data(leaves);
    mouseTargets
      .enter()
        .append("g").append("rect")
          .attr("transform", rotated ? "rotate(45),translate(0,0)" : "")
          .attr("fill", "transparent")
          .on("click", function(d, i) {
            var dim = rotated ? 'x' : 'y';
            var hl = controller.highlight() || {x:null, y:null};
            if (hl[dim] == i) {
              // If clicked already-highlighted row/col, then unhighlight
              hl[dim] = null;
              controller.highlight(hl);
            } else {
              hl[dim] = i;
              controller.highlight(hl);
            }
            d3.event.stopPropagation();
          });
    function layoutMouseTargets(selection) {
      selection
          .attr("transform", function(d, i) {
            var x = rotated ? scale(d) + scale.rangeBand()/2 : 0;
            var y = rotated ? padding + 6 : scale(d);
            return "translate(" + x + "," + y + ")";
          })
        .selectAll("rect")
          .attr("height", scale.rangeBand() / (rotated ? 1.414 : 1))
          .attr("width", rotated ? height * 1.414 * 1.2 : width);
    }
    layoutMouseTargets(mouseTargets);

    if (rotated) {
      axisNodes.selectAll("text")
        .attr("transform", "rotate(45),translate(6, 0)")
        .style("text-anchor", "start");
    }
    
    controller.on('highlight.axis-' + (rotated ? 'x' : 'y'), function(hl) {
      var ticks = axisNodes.selectAll('.tick');
      var selected = hl[rotated ? 'x' : 'y'];
      if (typeof(selected) !== 'number') {
        ticks.classed('faded', false);
        return;
      }
      ticks.classed('faded', function(d, i) {
        return i !== selected;
      });
    });

    controller.on('transform.axis-' + (rotated ? 'x' : 'y'), function(_) {
      var dim = rotated ? 0 : 1;
      //scale.domain(leaves.slice(_.extent[0][dim], _.extent[1][dim]));
      var rb = [_.translate[dim], (rotated ? width : height) * _.scale[dim] + _.translate[dim]];
      scale.rangeBands(rb);
      var tAxisNodes = axisNodes.transition().duration(opts.anim_duration).ease('linear');
      tAxisNodes.call(axis);
      // Set text-anchor on the non-transitioned node to prevent jumpiness
      // in RStudio Viewer pane
      axisNodes.selectAll("text").style("text-anchor", "start");
      tAxisNodes.selectAll("g")
          .style("opacity", function(d, i) {
            if (i >= _.extent[0][dim] && i < _.extent[1][dim]) {
              return 1;
            } else {
              return 0;
            }
          });
      tAxisNodes
        .selectAll("text")
          .style("text-anchor", "start");
      mouseTargets.transition().duration(opts.anim_duration).ease('linear')
          .call(layoutMouseTargets)
          .style("opacity", function(d, i) {
            if (i >= _.extent[0][dim] && i < _.extent[1][dim]) {
              return 1;
            } else {
              return 0;
            }
          });
    });

  }
  
  function edgeStrokeWidth(node) {
    if (node.edgePar && node.edgePar.lwd)
      return node.edgePar.lwd;
    else
      return 1;
  }
  
  function maxChildStrokeWidth(node, recursive) {
    var max = 0;
    for (var i = 0; i < node.children.length; i++) {
      if (recursive) {
        max = Math.max(max, maxChildStrokeWidth(node.children[i], true));
      }
      max = Math.max(max, edgeStrokeWidth(node.children[i]));
    }
    return max;
  }
  
  function dendrogram(svg, data, rotated, width, height, padding) {
    var topLineWidth = maxChildStrokeWidth(data, false);
    
    var x = d3.scale.linear()
        .domain([data.height, 0])
        .range([topLineWidth/2, width-padding]);
    var y = d3.scale.linear()
        .domain([0, height])
        .range([0, height]);
    
    var cluster = d3.layout.cluster()
        .separation(function(a, b) { return 1; })
        .size([rotated ? width : height, NaN]);
    
    var transform = "translate(1,0)";
    if (rotated) {
      // Flip dendrogram vertically
      x.range([topLineWidth/2, -height+padding+2]);
      // Rotate
      transform = "rotate(-90) translate(-2,0)";
    }

    var dendrG = svg
        .attr("width", width)
        .attr("height", height)
      .append("g")
        .attr("transform", transform);
    
    var nodes = cluster.nodes(data),
        links = cluster.links(nodes);

    // I'm not sure why, but after the heatmap loads the "links"
    // array mutates to much smaller values. I can't figure out
    // what's doing it, so instead we just make a deep copy of
    // the parts we want.
    var links1 = links.map(function(link, i) {
      return {
        source: {x: link.source.x, y: link.source.height},
        target: {x: link.target.x, y: link.target.height},
        edgePar: link.target.edgePar
      };
    });
    
    var lines = dendrG.selectAll("polyline").data(links1);
    lines
      .enter().append("polyline")
        .attr("class", "link")
        .attr("stroke", function(d, i) {
          if (!d.edgePar.col) {
            return opts.link_color;
          } else {
            return d.edgePar.col;
          }
        })
        .attr("stroke-width", edgeStrokeWidth)
        .attr("stroke-dasharray", function(d, i) {
          var pattern;
          switch (d.edgePar.lty) {
            case 6:
              pattern = [3,3,5,3];
              break;
            case 5:
              pattern = [15,5];
              break;
            case 4:
              pattern = [2,4,4,4];
              break;
            case 3:
              pattern = [2,4];
              break;
            case 2:
              pattern = [4,4];
              break;
            case 1:
            default:
              pattern = [];
              break;
          }
          for (var i = 0; i < pattern.length; i++) {
            pattern[i] = pattern[i] * (d.edgePar.lwd || 1);
          }
          return pattern.join(",");
        });

    function draw(selection) {
      function elbow(d, i) {
        return x(d.source.y) + "," + y(d.source.x) + " " +
            x(d.source.y) + "," + y(d.target.x) + " " +
            x(d.target.y) + "," + y(d.target.x);
      }
      
      selection
          .attr("points", elbow);
    }

    controller.on('transform.dendr-' + (rotated ? 'x' : 'y'), function(_) {
      var scaleBy = _.scale[rotated ? 0 : 1];
      var translateBy = _.translate[rotated ? 0 : 1];
      y.range([translateBy, height * scaleBy + translateBy]);
      draw(lines.transition().duration(opts.anim_duration).ease("linear"));
    });

    draw(lines);
  }

 
  var dispatcher = d3.dispatch('hover', 'click');
  
  controller.on("datapoint_hover", function(_) {
    dispatcher.hover({data: _});
  });
  
  function on_col_label_mouseenter(e) {
    controller.highlight(+d3.select(this).attr("index"), null);
  }
  function on_col_label_mouseleave(e) {
    controller.highlight(null, null);
  }
  function on_row_label_mouseenter(e) {
    controller.highlight(null, +d3.select(this).attr("index"));
  }
  function on_row_label_mouseleave(e) {
    controller.highlight(null, null);
  }

  return {
    on: function(type, listener) {
      dispatcher.on(type, listener);
      return this;
    }
  };
}
</script>
<script>// d3.tip
// Copyright (c) 2013 Justin Palmer
//
// Tooltips for d3.js SVG visualizations

(function (root, factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD. Register as an anonymous module with d3 as a dependency.
    define(['d3'], factory)
  } else if (typeof module === 'object' && module.exports) {
    // CommonJS
    module.exports = function(d3) {
      d3.tip = factory(d3)
      return d3.tip
    }
  } else {
    // Browser global.
    root.d3.tip = factory(root.d3)
  }
}(this, function (d3) {

  // Public - contructs a new tooltip
  //
  // Returns a tip
  return function() {
    var direction = d3_tip_direction,
        offset    = d3_tip_offset,
        html      = d3_tip_html,
        node      = initNode(),
        svg       = null,
        point     = null,
        target    = null

    function tip(vis) {
      svg = getSVGNode(vis)
      point = svg.createSVGPoint()
      document.body.appendChild(node)
    }

    // Public - show the tooltip on the screen
    //
    // Returns a tip
    tip.show = function() {
      var args = Array.prototype.slice.call(arguments)
      if(args[args.length - 1] instanceof SVGElement) target = args.pop()

      var content = html.apply(this, args),
          poffset = offset.apply(this, args),
          dir     = direction.apply(this, args),
          nodel   = d3.select(node),
          i       = directions.length,
          coords,
          scrollTop  = document.documentElement.scrollTop || document.body.scrollTop,
          scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft

      nodel.html(content)
        .style({ opacity: 1, 'pointer-events': 'all' })

      while(i--) nodel.classed(directions[i], false)
      coords = direction_callbacks.get(dir).apply(this)
      nodel.classed(dir, true).style({
        top: (coords.top +  poffset[0]) + scrollTop + 'px',
        left: (coords.left + poffset[1]) + scrollLeft + 'px'
      })

      return tip
    }

    // Public - hide the tooltip
    //
    // Returns a tip
    tip.hide = function() {
      var nodel = d3.select(node)
      nodel.style({ opacity: 0, 'pointer-events': 'none' })
      return tip
    }

    // Public: Proxy attr calls to the d3 tip container.  Sets or gets attribute value.
    //
    // n - name of the attribute
    // v - value of the attribute
    //
    // Returns tip or attribute value
    tip.attr = function(n, v) {
      if (arguments.length < 2 && typeof n === 'string') {
        return d3.select(node).attr(n)
      } else {
        var args =  Array.prototype.slice.call(arguments)
        d3.selection.prototype.attr.apply(d3.select(node), args)
      }

      return tip
    }

    // Public: Proxy style calls to the d3 tip container.  Sets or gets a style value.
    //
    // n - name of the property
    // v - value of the property
    //
    // Returns tip or style property value
    tip.style = function(n, v) {
      if (arguments.length < 2 && typeof n === 'string') {
        return d3.select(node).style(n)
      } else {
        var args =  Array.prototype.slice.call(arguments)
        d3.selection.prototype.style.apply(d3.select(node), args)
      }

      return tip
    }

    // Public: Set or get the direction of the tooltip
    //
    // v - One of n(north), s(south), e(east), or w(west), nw(northwest),
    //     sw(southwest), ne(northeast) or se(southeast)
    //
    // Returns tip or direction
    tip.direction = function(v) {
      if (!arguments.length) return direction
      direction = v == null ? v : d3.functor(v)

      return tip
    }

    // Public: Sets or gets the offset of the tip
    //
    // v - Array of [x, y] offset
    //
    // Returns offset or
    tip.offset = function(v) {
      if (!arguments.length) return offset
      offset = v == null ? v : d3.functor(v)

      return tip
    }

    // Public: sets or gets the html value of the tooltip
    //
    // v - String value of the tip
    //
    // Returns html value or tip
    tip.html = function(v) {
      if (!arguments.length) return html
      html = v == null ? v : d3.functor(v)

      return tip
    }

    function d3_tip_direction() { return 'n' }
    function d3_tip_offset() { return [0, 0] }
    function d3_tip_html() { return ' ' }

    var direction_callbacks = d3.map({
      n:  direction_n,
      s:  direction_s,
      e:  direction_e,
      w:  direction_w,
      nw: direction_nw,
      ne: direction_ne,
      sw: direction_sw,
      se: direction_se
    }),

    directions = direction_callbacks.keys()

    function direction_n() {
      var bbox = getScreenBBox()
      return {
        top:  bbox.n.y - node.offsetHeight,
        left: bbox.n.x - node.offsetWidth / 2
      }
    }

    function direction_s() {
      var bbox = getScreenBBox()
      return {
        top:  bbox.s.y,
        left: bbox.s.x - node.offsetWidth / 2
      }
    }

    function direction_e() {
      var bbox = getScreenBBox()
      return {
        top:  bbox.e.y - node.offsetHeight / 2,
        left: bbox.e.x
      }
    }

    function direction_w() {
      var bbox = getScreenBBox()
      return {
        top:  bbox.w.y - node.offsetHeight / 2,
        left: bbox.w.x - node.offsetWidth
      }
    }

    function direction_nw() {
      var bbox = getScreenBBox()
      return {
        top:  bbox.nw.y - node.offsetHeight,
        left: bbox.nw.x - node.offsetWidth
      }
    }

    function direction_ne() {
      var bbox = getScreenBBox()
      return {
        top:  bbox.ne.y - node.offsetHeight,
        left: bbox.ne.x
      }
    }

    function direction_sw() {
      var bbox = getScreenBBox()
      return {
        top:  bbox.sw.y,
        left: bbox.sw.x - node.offsetWidth
      }
    }

    function direction_se() {
      var bbox = getScreenBBox()
      return {
        top:  bbox.se.y,
        left: bbox.e.x
      }
    }

    function initNode() {
      var node = d3.select(document.createElement('div'))
      node.style({
        position: 'absolute',
        top: 0,
        opacity: 0,
        'pointer-events': 'none',
        'box-sizing': 'border-box'
      })

      return node.node()
    }

    function getSVGNode(el) {
      el = el.node()
      if(el.tagName.toLowerCase() === 'svg')
        return el

      return el.ownerSVGElement
    }

    // Private - gets the screen coordinates of a shape
    //
    // Given a shape on the screen, will return an SVGPoint for the directions
    // n(north), s(south), e(east), w(west), ne(northeast), se(southeast), nw(northwest),
    // sw(southwest).
    //
    //    +-+-+
    //    |   |
    //    +   +
    //    |   |
    //    +-+-+
    //
    // Returns an Object {n, s, e, w, nw, sw, ne, se}
    function getScreenBBox() {
      var targetel   = target || d3.event.target,
          bbox       = {},
          matrix     = targetel.getScreenCTM(),
          tbbox      = targetel.getBBox(),
          width      = tbbox.width,
          height     = tbbox.height,
          x          = tbbox.x,
          y          = tbbox.y

      point.x = x
      point.y = y
      bbox.nw = point.matrixTransform(matrix)
      point.x += width
      bbox.ne = point.matrixTransform(matrix)
      point.y += height
      bbox.se = point.matrixTransform(matrix)
      point.x -= width
      bbox.sw = point.matrixTransform(matrix)
      point.y -= height / 2
      bbox.w  = point.matrixTransform(matrix)
      point.x += width
      bbox.e = point.matrixTransform(matrix)
      point.x -= width / 2
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