knnGraph_SCoPE2.html

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<title>forceNetwork</title>
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            .css("height", el.offsetHeight);
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          $el.after(errorDiv);

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              .css("left", el.offsetLeft)
              .css("maxWidth", el.offsetWidth)
              .css("height", el.offsetHeight);
          }, 500);
        }
      }
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    sizing: {}
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  // - name (required) - A string indicating the binding name, which will be
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  // - 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
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  //   element; Shiny apps will cause this to be called multiple times per
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    // TODO: Verify that .name is a valid CSS classname

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    // 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).
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    // 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) {
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        return filterByClass(results, "html-widget-output", false);
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    window.HTMLWidgets.widgets.push(staticBinding);

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      // definition. This is because we foolishly used the same method
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      // 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();

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      // 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.
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      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) {
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            return;
          } else {
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        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
  / delay execution of those methods (until Shiny methods are ready)
  / https://github.com/rstudio/leaflet/blob/18ec981/javascript/src/index.js#L266-L268
  /
  / Ideally widget authors wouldn't need to use this setTimeout() hack that
  / leaflet uses to call Shiny methods on a staticRender(). In the long run,
  / the logic initShiny should be broken up so that method registration happens
  / right away, but binding happens later.
  */
  function maybeStaticRenderLater() {
    if (shinyMode && has_jQuery3()) {
      window.jQuery(window.HTMLWidgets.staticRender);
    } else {
      window.HTMLWidgets.staticRender();
    }
  }

  if (document.addEventListener) {
    document.addEventListener("DOMContentLoaded", function() {
      document.removeEventListener("DOMContentLoaded", arguments.callee, false);
      maybeStaticRenderLater();
    }, false);
  } else if (document.attachEvent) {
    document.attachEvent("onreadystatechange", function() {
      if (document.readyState === "complete") {
        document.detachEvent("onreadystatechange", arguments.callee);
        maybeStaticRenderLater();
      }
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e=Math.sqrt(n/fb);t.moveTo(e,0),t.arc(0,0,e,0,hb)}},Tb={draw:function(t,n){var e=Math.sqrt(n/5)/2;t.moveTo(-3*e,-e),t.lineTo(-e,-e),t.lineTo(-e,-3*e),t.lineTo(e,-3*e),t.lineTo(e,-e),t.lineTo(3*e,-e),t.lineTo(3*e,e),t.lineTo(e,e),t.lineTo(e,3*e),t.lineTo(-e,3*e),t.lineTo(-e,e),t.lineTo(-3*e,e),t.closePath()}},Nb=Math.sqrt(1/3),kb=2*Nb,Sb={draw:function(t,n){var e=Math.sqrt(n/kb),r=e*Nb;t.moveTo(0,-e),t.lineTo(r,0),t.lineTo(0,e),t.lineTo(-r,0),t.closePath()}},Eb=.8908130915292852,Ab=Math.sin(fb/10)/Math.sin(7*fb/10),Cb=Math.sin(hb/10)*Ab,zb=-Math.cos(hb/10)*Ab,Pb={draw:function(t,n){var e=Math.sqrt(n*Eb),r=Cb*e,i=zb*e;t.moveTo(0,-e),t.lineTo(r,i);for(var o=1;o<5;++o){var u=hb*o/5,a=Math.cos(u),c=Math.sin(u);t.lineTo(c*e,-a*e),t.lineTo(a*r-c*i,c*r+a*i)}t.closePath()}},Rb={draw:function(t,n){var e=Math.sqrt(n),r=-e/2;t.rect(r,r,e,e)}},qb=Math.sqrt(3),Lb={draw:function(t,n){var e=-Math.sqrt(n/(3*qb));t.moveTo(0,2*e),t.lineTo(-qb*e,-e),t.lineTo(qb*e,-e),t.closePath()}},Ub=-.5,Db=Math.sqrt(3)/2,Ob=1/Math.sqrt(12),Fb=3*(Ob/2+1),Ib={draw:function(t,n){var e=Math.sqrt(n/Fb),r=e/2,i=e*Ob,o=r,u=e*Ob+e,a=-o,c=u;t.moveTo(r,i),t.lineTo(o,u),t.lineTo(a,c),t.lineTo(Ub*r-Db*i,Db*r+Ub*i),t.lineTo(Ub*o-Db*u,Db*o+Ub*u),t.lineTo(Ub*a-Db*c,Db*a+Ub*c),t.lineTo(Ub*r+Db*i,Ub*i-Db*r),t.lineTo(Ub*o+Db*u,Ub*u-Db*o),t.lineTo(Ub*a+Db*c,Ub*c-Db*a),t.closePath()}},Yb=[Mb,Tb,Sb,Rb,Pb,Lb,Ib],Bb=function(){function t(){var t;if(r||(r=t=Re()),n.apply(this,arguments).draw(r,+e.apply(this,arguments)),t)return r=null,t+""||null}var n=cb(Mb),e=cb(64),r=null;return t.type=function(e){return arguments.length?(n="function"==typeof e?e:cb(e),t):n},t.size=function(n){return arguments.length?(e="function"==typeof n?n:cb(+n),t):e},t.context=function(n){return 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fc(t)};lc.prototype={areaStart:jb,areaEnd:jb,lineStart:function(){this._x0=this._x1=this._x2=this._x3=this._x4=this._y0=this._y1=this._y2=this._y3=this._y4=NaN,this._point=0},lineEnd:function(){switch(this._point){case 1:this._context.moveTo(this._x2,this._y2),this._context.closePath();break;case 2:this._context.moveTo((this._x2+2*this._x3)/3,(this._y2+2*this._y3)/3),this._context.lineTo((this._x3+2*this._x2)/3,(this._y3+2*this._y2)/3),this._context.closePath();break;case 3:this.point(this._x2,this._y2),this.point(this._x3,this._y3),this.point(this._x4,this._y4)}},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._x2=t,this._y2=n;break;case 1:this._point=2,this._x3=t,this._y3=n;break;case 2:this._point=3,this._x4=t,this._y4=n,this._context.moveTo((this._x0+4*this._x1+t)/6,(this._y0+4*this._y1+n)/6);break;default:sc(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}};var Xb=function(t){return new lc(t)};hc.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=NaN,this._point=0},lineEnd:function(){(this._line||0!==this._line&&3===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1;break;case 1:this._point=2;break;case 2:this._point=3;var e=(this._x0+4*this._x1+t)/6,r=(this._y0+4*this._y1+n)/6;this._line?this._context.lineTo(e,r):this._context.moveTo(e,r);break;case 3:this._point=4;default:sc(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}};var Vb=function(t){return new hc(t)};pc.prototype={lineStart:function(){this._x=[],this._y=[],this._basis.lineStart()},lineEnd:function(){var t=this._x,n=this._y,e=t.length-1;if(e>0)for(var 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2:this._point=3;default:dc(this,t,n)}this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var $b=function t(n){function e(t){return new vc(t,n)}return e.tension=function(n){return t(+n)},e}(0);_c.prototype={areaStart:jb,areaEnd:jb,lineStart:function(){this._x0=this._x1=this._x2=this._x3=this._x4=this._x5=this._y0=this._y1=this._y2=this._y3=this._y4=this._y5=NaN,this._point=0},lineEnd:function(){switch(this._point){case 1:this._context.moveTo(this._x3,this._y3),this._context.closePath();break;case 2:this._context.lineTo(this._x3,this._y3),this._context.closePath();break;case 3:this.point(this._x3,this._y3),this.point(this._x4,this._y4),this.point(this._x5,this._y5)}},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._x3=t,this._y3=n;break;case 1:this._point=2,this._context.moveTo(this._x4=t,this._y4=n);break;case 2:this._point=3,this._x5=t,this._y5=n;break;default:dc(this,t,n)}this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var Zb=function t(n){function e(t){return new _c(t,n)}return e.tension=function(n){return t(+n)},e}(0);yc.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._x2=this._y0=this._y1=this._y2=NaN,this._point=0},lineEnd:function(){(this._line||0!==this._line&&3===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1;break;case 1:this._point=2;break;case 2:this._point=3,this._line?this._context.lineTo(this._x2,this._y2):this._context.moveTo(this._x2,this._y2);break;case 3:this._point=4;default:dc(this,t,n)}this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var Gb=function t(n){function e(t){return new yc(t,n)}return e.tension=function(n){return t(+n)},e}(0);mc.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._x2=this._y0=this._y1=this._y2=NaN,this._l01_a=this._l12_a=this._l23_a=this._l01_2a=this._l12_2a=this._l23_2a=this._point=0},lineEnd:function(){switch(this._point){case 2:this._context.lineTo(this._x2,this._y2);break;case 3:this.point(this._x2,this._y2)}(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){if(t=+t,n=+n,this._point){var e=this._x2-t,r=this._y2-n;this._l23_a=Math.sqrt(this._l23_2a=Math.pow(e*e+r*r,this._alpha))}switch(this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;break;case 2:this._point=3;default:gc(this,t,n)}this._l01_a=this._l12_a,this._l12_a=this._l23_a,this._l01_2a=this._l12_2a,this._l12_2a=this._l23_2a,this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var Jb=function t(n){function e(t){return n?new mc(t,n):new vc(t,0)}return e.alpha=function(n){return t(+n)},e}(.5);xc.prototype={areaStart:jb,areaEnd:jb,lineStart:function(){this._x0=this._x1=this._x2=this._x3=this._x4=this._x5=this._y0=this._y1=this._y2=this._y3=this._y4=this._y5=NaN,this._l01_a=this._l12_a=this._l23_a=this._l01_2a=this._l12_2a=this._l23_2a=this._point=0},lineEnd:function(){switch(this._point){case 1:this._context.moveTo(this._x3,this._y3),this._context.closePath();break;case 2:this._context.lineTo(this._x3,this._y3),this._context.closePath();break;case 3:this.point(this._x3,this._y3),this.point(this._x4,this._y4),this.point(this._x5,this._y5)}},point:function(t,n){if(t=+t,n=+n,this._point){var e=this._x2-t,r=this._y2-n;this._l23_a=Math.sqrt(this._l23_2a=Math.pow(e*e+r*r,this._alpha))}switch(this._point){case 0:this._point=1,this._x3=t,this._y3=n;break;case 1:this._point=2,this._context.moveTo(this._x4=t,this._y4=n);break;case 2:this._point=3,this._x5=t,this._y5=n;break;default:gc(this,t,n)}this._l01_a=this._l12_a,this._l12_a=this._l23_a,this._l01_2a=this._l12_2a,this._l12_2a=this._l23_2a,this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var Qb=function t(n){function e(t){return n?new xc(t,n):new _c(t,0)}return e.alpha=function(n){return t(+n)},e}(.5);bc.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._x2=this._y0=this._y1=this._y2=NaN,this._l01_a=this._l12_a=this._l23_a=this._l01_2a=this._l12_2a=this._l23_2a=this._point=0;
},lineEnd:function(){(this._line||0!==this._line&&3===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){if(t=+t,n=+n,this._point){var e=this._x2-t,r=this._y2-n;this._l23_a=Math.sqrt(this._l23_2a=Math.pow(e*e+r*r,this._alpha))}switch(this._point){case 0:this._point=1;break;case 1:this._point=2;break;case 2:this._point=3,this._line?this._context.lineTo(this._x2,this._y2):this._context.moveTo(this._x2,this._y2);break;case 3:this._point=4;default:gc(this,t,n)}this._l01_a=this._l12_a,this._l12_a=this._l23_a,this._l01_2a=this._l12_2a,this._l12_2a=this._l23_2a,this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var Kb=function t(n){function e(t){return n?new bc(t,n):new yc(t,0)}return e.alpha=function(n){return t(+n)},e}(.5);wc.prototype={areaStart:jb,areaEnd:jb,lineStart:function(){this._point=0},lineEnd:function(){this._point&&this._context.closePath()},point:function(t,n){t=+t,n=+n,this._point?this._context.lineTo(t,n):(this._point=1,this._context.moveTo(t,n))}};var tw=function(t){return new wc(t)};Sc.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=this._t0=NaN,this._point=0},lineEnd:function(){switch(this._point){case 2:this._context.lineTo(this._x1,this._y1);break;case 3:kc(this,this._t0,Nc(this,this._t0))}(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){var e=NaN;if(t=+t,n=+n,t!==this._x1||n!==this._y1){switch(this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;break;case 2:this._point=3,kc(this,Nc(this,e=Tc(this,t,n)),e);break;default:kc(this,this._t0,e=Tc(this,t,n))}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n,this._t0=e}}},(Ec.prototype=Object.create(Sc.prototype)).point=function(t,n){Sc.prototype.point.call(this,n,t)},Ac.prototype={moveTo:function(t,n){this._context.moveTo(n,t)},closePath:function(){this._context.closePath()},lineTo:function(t,n){this._context.lineTo(n,t)},bezierCurveTo:function(t,n,e,r,i,o){this._context.bezierCurveTo(n,t,r,e,o,i)}},Pc.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x=[],this._y=[]},lineEnd:function(){var t=this._x,n=this._y,e=t.length;if(e)if(this._line?this._context.lineTo(t[0],n[0]):this._context.moveTo(t[0],n[0]),2===e)this._context.lineTo(t[1],n[1]);else for(var 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<script>HTMLWidgets.widget({

  name: "forceNetwork",

  type: "output",

  initialize: function(el, width, height) {

    d3.select(el).append("svg")
        .attr("width", width)
        .attr("height", height);

    return d3.forceSimulation();
  },

  resize: function(el, width, height, force) {

    d3.select(el).select("svg")
        .attr("width", width)
        .attr("height", height);

    force.force("center", d3.forceCenter(width / 2, height / 2))
        .restart();
  },

  renderValue: function(el, x, force) {

  // Compute the node radius  using the javascript math expression specified
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            if(options.nodesize){
                    return eval(options.radiusCalculation);

            }else{
                    return 6}

    }


    // alias options
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    // convert links and nodes data frames to d3 friendly format
    var links = HTMLWidgets.dataframeToD3(x.links);
    var nodes = HTMLWidgets.dataframeToD3(x.nodes);

    // create linkedByIndex to quickly search for node neighbors
    // adapted from: http://stackoverflow.com/a/8780277/4389763
    var linkedByIndex = {};
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      linkedByIndex[d.target + "," + d.source] = 1;
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    function neighboring(a, b) {
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    // get the width and height
    var width = el.offsetWidth;
    var height = el.offsetHeight;

    var color = eval(options.colourScale);

    // set this up even if zoom = F
    var zoom = d3.zoom();

    // create d3 force layout
    force
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      .force("link", d3.forceLink(links).distance(options.linkDistance))
      .force("center", d3.forceCenter(width / 2, height / 2))
      .force("charge", d3.forceManyBody().strength(options.charge))
      .on("tick", tick);

    force.alpha(1).restart();

      var drag = d3.drag()
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        .on("drag", dragged)
        .on("end", dragended)
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        d.fy = d.y;
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      function dragged(d) {
        d.fx = d3.event.x;
        d.fy = d3.event.y;
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      function dragended(d) {
        if (!d3.event.active) force.alphaTarget(0);
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        d.fy = null;
      }

    // select the svg element and remove existing children
    var svg = d3.select(el).select("svg");
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    // add two g layers; the first will be zoom target if zoom = T
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        .append("g")

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        .call(zoom);

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      .attr("class", "link")
      .style("stroke", function(d) { return d.colour ; })
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      .style("opacity", options.opacity)
      .style("stroke-width", eval("(" + options.linkWidth + ")"))
      .on("mouseover", function(d) {
          d3.select(this)
            .style("opacity", 1);
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          d3.select(this)
            .style("opacity", options.opacity);
      });

    if (options.arrows) {
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      var linkColoursArr = d3.nest().key(function(d) { return d.colour; }).entries(links);

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            .attr("refX", 0)
            .attr("markerWidth", 4)
            .attr("markerHeight", 4)
            .attr("orient", "auto")
            .style("fill", "context-fill")
            .style("fill", function(d) { return d.key; })
            .style("opacity", options.opacity)
          .append("path")
            .attr("d", "M0,-5 L10,0 L0,5");
    }

    // draw nodes
    var node = svg.selectAll(".node")
      .data(force.nodes())
      .enter().append("g")
      .attr("class", "node")
      .style("fill", function(d) { return color(d.group); })
      .style("opacity", options.opacity)
      .on("mouseover", mouseover)
      .on("mouseout", mouseout)
      .on("click", click)
      .call(drag);

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      .style("stroke", "#fff")
      .style("opacity", options.opacity)
      .style("stroke-width", "1.5px");

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      .text(function(d) { return d.name })
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      .style("opacity", options.opacityNoHover)
      .style("pointer-events", "none");

    function tick() {
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            d.y = Math.max(nodeSize(d), Math.min(height - nodeSize(d), d.y));
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      function idx(d, type) {
        var linkWidthFunc = eval("(" + options.linkWidth + ")");
			  var a = d.target.x - d.source.x;
			  var b = d.target.y - d.source.y;
			  var c = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2));
  			if (type == "x1") return (d.source.x + ((nodeSize(d.source) * a) / c));
  			if (type == "y1") return (d.source.y + ((nodeSize(d.source) * b) / c));
  			if (options.arrows) {
  			  if (type == "x2") return (d.target.x - ((((5 * linkWidthFunc(d)) + nodeSize(d.target)) * a) / c));
  			  if (type == "y2") return (d.target.y - ((((5 * linkWidthFunc(d)) + nodeSize(d.target)) * b) / c));
  			} else {
  			  if (type == "x2") return (d.target.x - ((nodeSize(d.target) * a) / c));
  			  if (type == "y2") return (d.target.y - ((nodeSize(d.target) * b) / c));
  			}
		  }

      link
        .attr("x1", function(d) { return idx(d, "x1"); })
        .attr("y1", function(d) { return idx(d, "y1"); })
        .attr("x2", function(d) { return idx(d, "x2"); })
        .attr("y2", function(d) { return idx(d, "y2"); });
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    function mouseover(d) {
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        var unfocusDivisor = 4;

        link.transition().duration(200)
          .style("opacity", function(l) { return d != l.source && d != l.target ? +options.opacity / unfocusDivisor : +options.opacity });

        node.transition().duration(200)
          .style("opacity", function(o) { return d.index == o.index || neighboring(d, o) ? +options.opacity : +options.opacity / unfocusDivisor; });
      //}

      d3.select(this).select("circle").transition()
        .duration(750)
        .attr("r", function(d){return nodeSize(d)+5;});
      d3.select(this).select("text").transition()
        .duration(750)
        .attr("x", 13)
        .style("stroke-width", ".5px")
        .style("font", options.clickTextSize + "px ")
        .style("opacity", 1);
    }

    function mouseout() {
      node.style("opacity", +options.opacity);
      link.style("opacity", +options.opacity);

      d3.select(this).select("circle").transition()
        .duration(750)
        .attr("r", function(d){return nodeSize(d);});
      d3.select(this).select("text").transition()
        .duration(1250)
        .attr("x", 0)
        .style("font", options.fontSize + "px ")
        .style("opacity", options.opacityNoHover);
    }

    function click(d) {
      return eval(options.clickAction)
    }

    // add legend option
    if(options.legend){
        var legendRectSize = 18;
        var legendSpacing = 4;
        var legend = svg.selectAll('.legend')
          .data(color.domain())
          .enter()
          .append('g')
          .attr('class', 'legend')
          .attr('transform', function(d, i) {
            var height = legendRectSize + legendSpacing;
            var offset =  height * color.domain().length / 2;
            var horz = legendRectSize;
            var vert = i * height+4;
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          .style('stroke', color);

        legend.append('text')
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          .attr('y', legendRectSize - legendSpacing)
          .text(function(d) { return d; });
    }

    // make font-family consistent across all elements
    d3.select(el).selectAll('text').style('font-family', options.fontFamily);
  },
});
</script>
</head>
<body style="background-color: white;">
<div id="htmlwidget_container">
<div id="htmlwidget-1eef8ddd77b92f7b7ea7" class="forceNetwork html-widget" style="width:960px;height:500px;">

</div>
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