REAL_student_ Heatmap

Inspired by Trulia Trends - but with code and using SVG.

Example data shows concurrent user sessions over time, taken from a development environment.

MIT Licensed, see LICENSE.MD.

forked from tjdecke's block: REAL_student_ Heatmap

<!DOCTYPE html>
<meta charset="utf-8">
<html>
  <head>
    <style>
      rect.bordered {
        stroke: #E6E6E6;
        stroke-width:2px;   
      }

text.mono {
        font-size: 9pt;
        font-family: Consolas, courier;
        fill: #aaa;
      }

text.axis-workweek {
        fill: #000;
      }

text.axis-worktime {
        fill: #000;
      }
    </style>
    <script src="https://d3js.org/d3.v3.js"></script>
  </head>
  <body>
    <div id="chart"></div>
    <div id="dataset-picker">
    </div>
    <script type="text/javascript">
      var margin = { top: 50, right: 630, bottom: 100, left: 131 },
          width = 960 - margin.left - margin.right,
          height = 430 - margin.top - margin.bottom,
          schools = 5,
          gridSize = Math.floor(width / schools),
          legendElementWidth = gridSize*2,
          buckets = 5,
          colors = ["#ffffd9","#edf8b1","#c7e9b4","#7fcdbb","#41b6c4","#1d91c0","#225ea8","#253494","#081d58"], // alternatively colorbrewer.YlGnBu[9]
          days = ["Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"],
          times = ["1a", "2a", "3a", "4a", "5a", "6a", "7a", "8a", "9a", "10a", "11a", "12a", "1p", "2p", "3p", "4p", "5p", "6p", "7p", "8p", "9p", "10p", "11p", "12p"],
          
          columns = ["k_rank_cond_parq5","k_rank_cond_parq4","k_rank_cond_parq3","k_rank_cond_parq2","k_rank_cond_parq1"];

var svg = d3.select("#chart").append("svg")
          .attr("width", width + margin.left + margin.right)
          .attr("height", height + margin.top + margin.bottom)
          .append("g")
          .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var xScale = d3.scale.ordinal().rangeBands([0, width]);
    var yScale = d3.scale.ordinal().rangeBands([0, height]);
    var colorScale = d3.scale.quantile()
              .domain([0, buckets - 1, 1])
              .range(colors);

var cards = svg.selectAll(".school")
          .data(data, function(d) {return d.school+':'+d.value;});
          cards.append("title");

cards.enter().append("rect") 
          
           .attr("x", function(d, i) {return gridSize* (i % schools) ; })
          
						.attr("y", function(d, i) { return gridSize * Math.floor(i / 5) ; })
              .attr("rx", 2)
              .attr("ry", 2)
              .attr("class", "hour bordered")
              .attr("width", gridSize)
              .attr("height", gridSize)
              .style("fill", colors[0]);

var names = [];

cards.transition().duration(1000)
              .style("fill", function(d) { return colorScale(d.value); });

cards.select("title").text(function(d) { return d.value; });
          
          cards.exit().remove();

var legend = svg.selectAll(".legend")
              .data([0].concat(colorScale.quantiles()), function(d) { return d; });

//           legend.enter().append("g")
//               .attr("class", "legend");

//           legend.append("rect")
//             .attr("x", function(d, i) { return legendElementWidth * i; })
//             .attr("y", height)
//             .attr("width", legendElementWidth)
//             .attr("height", gridSize / 2)
//             .style("fill", function(d, i) { return colors[i]; });

//           legend.append("text")
//             .attr("class", "mono")
//             .text(function(d) { return "≥ " + Math.round(d); })
//             .attr("x", function(d, i) { return legendElementWidth * i; })
//             .attr("y", height + gridSize);

//           legend.exit().remove();

});  
      };

heatmapChart("heat_test.csv");
      
      function onlyUnique(value, index, self) { 
    		return self.indexOf(value) === index;
			}

</script>
  </body>
</html>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js