This example courtesy of Displayr who have generously offered to sponsor a series of independently authored posts about interactive visualization with R and JavaScript. Thank you so much Displayr for this opportunity.

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Code in R

Below is the R source code for creating this visualization. You might notice that much of this is actually JavaScript. To see the JavaScript, please inspect index.html.

(function() {
library(htmltools)
library(d3r)
library(dplyr)

titan_nest <<- as.data.frame(Titanic) %>%
  select(-Age) %>%
  group_by(Class, Sex, Survived) %>%
  summarise(Freq = sum(Freq)) %>%
  d3_nest(value_cols="Freq", root="Titanic")
})()


scr_part <- function() {
  tags$script(HTML(
sprintf(
"
function initialize(hier) {
  d3.partition().size([height,width])(hier);
  
  var nodes = svg.selectAll('g.node')
    .data(hier.descendants());
  
  nodes = nodes.merge(
    nodes.enter().append('g')
      .attr('class','node')
  );

  nodes.attr('transform', function(d) {
    return 'translate(' + d.y0  + ',' + d.x0 + ')'
  });

  nodes.append('rect')
    .classed('rect-part', true);

  nodes.append('rect')
    .classed('rect-outline', true)
    .attr('width', function(d) { return d.y1 - d.y0; })
    .attr('height', function(d) { return d.x1 - d.x0; })
    .style('fill', 'none')
    .style('stroke', 'none');

  nodes.append('text')
    //.style('text-anchor','end')
    .attr('dy','1em')
    .text(function(d) { return d.data.name});

  return nodes;
}

function drawPart(hier, nodes, duration, delay) {
  d3.partition().size([height,width])(hier);

  svg.selectAll('.link')
    .transition()
    .duration(100)
    .style('opacity', 0.00001)
    .remove();

  nodes.selectAll('rect.rect-part')
    .transition()
    .duration(duration)
    .delay(delay)
    .attr('width', function(d) { return d.y1 - d.y0; })
    .attr('height', function(d) { return d.x1 - d.x0; })
    .attr('x', 0)
    .attr('y', 0)
    .style('fill', function(d) { return color(d.data.name) || 'gray'; })
    .style('stroke', 'white');

  nodes.selectAll('rect.rect-outline')
    .transition()
    .duration(duration)
    .delay(delay)
    .style('stroke', 'white')
    .style('fill', 'none')
    .style('stroke-dasharray', null);
}

var tm = %s;

var tm_h = d3.hierarchy(tm)
  .sum(function(d){
  return d.Freq || 0;
});

var width = 400;
var height = 400;

var svg = d3.select('body').append('svg')
  .style('width',width + 20 + 20)
  .style('height',height + 20 + 20)
  .append('g')
  .attr('transform','translate(20,20)');

var color = d3.scaleOrdinal(d3.schemeCategory10);

var nodes = initialize(tm_h);

drawPart(tm_h, nodes, 0, 0);
",
titan_nest
)
))
}


### create partition ####
browsable(
  tagList(
    d3_dep_v4(offline=FALSE),
    scr_part()
  )
)