D3 Examples - Randomized Stacked Bar Chart

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v3.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
  <style>
    .axis path,
    .axis line {
      fill: none;
      stroke: #000;
      shape-rendering: crispEdges;
    }
    .target-circle {
      fill: #4cc9fd;
      stroke: #048bbf;
      stroke-width: 2;
    }
    .text {
      font-size:14px;
      fill: #048bbf;
    }
    .startline {
      stroke: #4cc9fd;
      stroke-width: 3;
    }
    body {
      font-family: sans-serif;
      position: relative;
      margin: 10px auto;
    }
  </style>
</head>
​
<body>
  <div id="main"></div>
  <script>
    // D3 API: https://github.com/d3/d3-3.x-api-reference/blob/master/API-Reference.md
    // This example originated from https://stackoverflow.com/questions/15857286/how-to-create-a-bar-chart-made-up-of-very-small-squares
    var svg,
        max,
        xAxis,
        groups,
        types,
        width,
        height,
        xScale,
        yScale,
        timeScale,
        translate,
        randomize,
        randomDate,
        deals = {deals: []},
        timeSeries = [],
        sameDateArr = [],
        colorScale,
        maxSquares = 5,
        numDays = 50,
        sumA = sumB = sumC = 0,
        dateFormat = d3.time.format("%x"),
        startDate = new Date(2016, 0, 1),
        endDate = new Date(2016, 2, 1),
        OpCreatedDate = new Date(2016, 1, 5),
        OpClosedDate = new Date(2016, 1, 25),
        squareHeight = 12, // pixel height of squares
        margin = {top: 20, right: 20, bottom: 80, left: 40};
    // A helper to avoid having to use so many quotes inline
    translate = function(x,y){               
      return "translate(" + x + "," + y + ")";
    }
    
    // Help me randomize within an interval
    randomize = function(min,max) {
        return Math.floor(Math.random()*(max-min+1)+min);
    }
    
    // Help me generate random dates with intervals
    randomDate = function(start, end) {
​
        return new Date(start.getTime() + Math.random() * (end.getTime() - start.getTime()));
    }
​
    /**
     * Grouping function for grouping by action type.  Passed in as `grouping` param to formatDealTimelineActions
     * @param  {object} action An action element from the dealTimelineActions
     * @return {String} 
     */
    function groupByActionType(action) { 
        return action.actionType;
    }
    /**
     * Convert an epoch timestamp into a date string
     * @param  {int} epoch The epoch -- # of seconds since UTC 1970-01-01 00:00:00
     * @return {Date}     Date object of the passed in date.
     */
    function epochToDate(epoch) { 
        var d = new Date(0); // The 0 there is the key, which sets the date to the epoch
        d.setUTCSeconds(epoch / 1000);
​
        return d;
    }
    /**
     * Format a date to format "YYYY-MM-DD"
     * @param  {Date} date The date to format 
     * @return {String}    The date in format "YYYY-MM-DD"
     */
    function formatDate(date) { 
        return [date.getFullYear(), String("00" + (date.getMonth() + 1)).slice(-2), String("00" + date.getDate()).slice(-2)].join("-");
    }
​
    /**
     * Format the deal timeline actions so that they conform to what our graph expects
     * @param  {integer} index Index of the deal timeline actions to format
     * @param {function} grouping A function to use that will take a deal timeline action element and output a group 
     *                            name for that element.
     * @return {Array}        An object in format required by our D3 plot to generate the time series plot;
     *                            An array of objects with keys date and (group names).  For this example we are using
     *                            groupings of actionType
     */
    function formatDealTimelineActions(actions, grouping) { 
        // This is probably not the *most* performant method to do this ... but still
        // We gotta grab the full list of possible groupings from the data somehow?
        var groups = new Set();
        _.each(actions, function(x) { 
          x.group = grouping(x);
          groups.add(x.group);
        });
​
        // Sort the timeline actions by date:
        actions.sort(function(x, y) { return x.activityTimeAt < y.activityTimeAt ? -1 : 1; })
        console.log(actions);
​
        var timeSeries = [],
            entryProto = {},
            entry;
        groups.forEach(function(x) { entryProto[x] = 0; });
        entry = _.clone(entryProto);
​
        
        actions.forEach(function(x) { 
            var date = formatDate(epochToDate(x.activityTimeAt));
            if (!entry.date || entry.date < date) { 
                if (entry.date) { 
                    var newDateString = entry.date;
                    var newDate = new Date(newDateString);
                    // go ahead and populate dummies for anything that is missing data
                    while (newDateString < date) {
                        newDate.setDate(newDate.getDate() + 1);
                        newDateString = formatDate(epochToDate(newDate));
​
                        // @TODO: Fix me!  Probably use a *gasp* date library like moment (or maybe D3 has one)
                        if (newDateString == entry.date) { continue; } // Crappy work-around for UTC that I'm a little too lazy to deal with right now
                        
                        timeSeries.push(entry); 
                        entry = _.clone(entryProto);
                        entry.date = newDateString;
                    }
                } else { 
                    entry.date = date;
                }
            }
​
            entry[x.group] ++;
        });
​
        timeSeries.push(entry);
​
        return timeSeries;    
    }
​
    /** RANDOMLY GENERATE DATA */
​
    // Help me create a series of random epoch times within a given date
    randomTimes = function(date) {
      var numTimes = randomize(0, 10);
      var i = 0;
      var times = [];
      var date = date.getTime(); // Get the beginning of the date...
      while (i < numTimes) { 
        times.push(date + randomize(0, 3600 * 24));
        i ++;
      }
​
      return times;
    }
​
    randomGroup = function(grp) { 
      var groups = ["a", "b", "c", "d"];
​
      return groups[randomize(0, groups.length - 1)];
    }
    
    // This color scale assigns a sequence of 10 colors to each data "type" : a,b,c,d
    colorScale = d3.scale.category10().domain(["a", "b", "c", "d"]);
    
    // Populate a dummy array with random data
    generateRandomData = function() { 
      var data = [];
      for (var day=0; day < numDays; day++) {
        var date = randomDate(startDate, endDate);
        var times = randomTimes(date);
        times.forEach(function(time){ 
          data.push({
            "actionType": randomGroup(),
            "activityTimeAt": time, 
            "activityTimeSegment": "DURING",
          });  
        });
        
      }
​
      return data;
    }
​
    // Generate three random deal sets, why not -- this is roughly how stuff comes in from the endpoint.
    deals.deals[0] = generateRandomData();
    deals.deals[1] = generateRandomData();
    deals.deals[2] = generateRandomData();
​
    console.log(deals);
    
    // Format that data using the formatting function ... duh ... :-)
    timeSeries = formatDealTimelineActions(deals.deals[0], groupByActionType);
    console.log('timeseries: ', timeSeries);
    
    // Graph width based on data
    width = squareHeight * timeSeries.length;
    // Find the height of the tallest column to set a 'y scale'
    max = d3.max(timeSeries, function(d){return d.a + d.b + d.c});
    height = max * squareHeight;
 
    // Create a linear scale for the x-axis labels
    xScale = d3.scale.linear()
        .range([0,width])
        .domain([0,timeSeries.length]);
    
    // Create a time scale for the viz.. extracted start/end dates from data
    timeScale = d3.time.scale()
        .range([0, width])
        .domain([startDate, endDate]);
    
    var xTime = d3.scale.ordinal()
      .domain(d3.time.days(startDate, endDate))
      .rangeRoundBands([0, width], .1); 
    // Create a linear vertical scale so that we can group boxes vertically
    yScale = d3.scale.linear()
        .domain([0, max])
        .rangeRound([height, 0]);
    
    // Define an axis object for x
    xAxis = d3.svg.axis()
        .scale(timeScale)
        .orient("bottom")
        .tickFormat(d3.time.format("%b"))
        .ticks(d3.time.months, 10)
        //.tickSubdivide(2);
    // Create svg container and position its main group "g" to top left
    svg = d3.select("#main").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
        .attr("padding-left", "50px")
        .append("g")
        .attr("transform", translate(margin.left, margin.top + 0.5));
    // Set up an "offsets" array for each color type ('a', 'b', 'c'). This
    // associates a color domain for each stack segment (starting block, ending block)
    timeSeries.forEach(function(d){
      var y0 = 0;
      d.offsets = colorScale.domain().map(function(type){
        return {type: type, y0: y0, y1: y0 += +d[type], value : d[type]}
      });
    });
    // Now, render and position the x-axis in a group element
    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
    
    
​
 
    
    //console.log('timeseries: ', timeSeries);
    
    // Create/position a g element for each tower. 
    groups = svg.selectAll(".group")
        .data(timeSeries)
        .enter().append("g")
            .attr("transform", function(d,i){ 
                    //console.log('time d: ', d); 
                    return "translate(" + xScale(i) + ", -4)";
                    })
            .attr("class", "group");  
    // Create a g element for each section of a tower.
    types = groups.selectAll(".type")
        .data(function(d){return d.offsets})
        .enter().append("g")
          .attr("transform", function(d){ return translate(0, yScale(d.y1))})
          .attr("class", "type")
          .attr("fill", function(d){return colorScale(d.type)});
    // Create the individual squares
    types.selectAll("rect")
        .data(function(d){return d3.range(0,d.value)})
        .enter().append("rect")
          .attr("height", squareHeight-0.5)
          .attr("width", squareHeight-0.5)
          .attr("y", function(d){ return squareHeight * d });
    
     svg.append("line")
        .attr('class', 'startline')
        .attr("x1", timeScale(OpCreatedDate))     // x position of the first end of the line
      .attr("y1", 0 - margin.top)      // y position of the first end of the line
      .attr("x2", timeScale(OpCreatedDate))     // x position of the second end of the line
      .attr("y2", height);
    
    svg.append("circle")
      .attr('r', 10)
      .attr('class', 'target-circle')
      .attr("transform", function(d,i){ 
        return "translate(" + timeScale(OpCreatedDate) + ", " + height + ")";
        });
    
    svg.append("line")
        .attr('class', 'startline')
        .attr("x1", timeScale(OpClosedDate))     // x position of the first end of the line
      .attr("y1", 0 - margin.top)      // y position of the first end of the line
      .attr("x2", timeScale(OpClosedDate))     // x position of the second end of the line
      .attr("y2", height);
    
    svg.append("circle")
      .attr('r', 10)
      .attr('class', 'target-circle')
      .attr("transform", function(d,i){ 
        return "translate(" + timeScale(OpClosedDate) + ", " + height + ")";
        });
    
    svg.append("text")
      .attr("dx", timeScale(OpCreatedDate))
      .attr("dy", height + 30)
        .attr("class", "text")
      .text(dateFormat(OpCreatedDate));
    
    svg.append("text")
      .attr("dx", timeScale(OpClosedDate))
      .attr("dy", height + 30)
        .attr("class", "text")
      .text(dateFormat(OpClosedDate));
  </script>
</body>
    