D3.Js Tutorial: Calendar View

By Xah Lee. Date: .

how does it work?

first, we define these CSS:

.day {
  fill: white;
  stroke: silver;

}

.month {
  fill: none;
  stroke: black;
  stroke-width: 2px;
}

.RdYlGn .q0-11{fill:rgb(165,0,38)}
.RdYlGn .q1-11{fill:rgb(215,48,39)}
.RdYlGn .q2-11{fill:rgb(244,109,67)}
.RdYlGn .q3-11{fill:rgb(253,174,97)}
.RdYlGn .q4-11{fill:rgb(254,224,139)}
.RdYlGn .q5-11{fill:rgb(255,255,191)}
.RdYlGn .q6-11{fill:rgb(217,239,139)}
.RdYlGn .q7-11{fill:rgb(166,217,106)}
.RdYlGn .q8-11{fill:rgb(102,189,99)}
.RdYlGn .q9-11{fill:rgb(26,152,80)}
.RdYlGn .q10-11{fill:rgb(0,104,55)}

these are SVG's style attributes. [see SVG: Specifying Styles]

Those rgb are standard CSS color syntax. [see CSS Color Syntax]

we'll be creating SVG elements with these classes, so that they'll be colored so.

Here's our html:

<div id="d3_calendar_demo_22057"></div>
<script src="d3.v3.min.js"></script>
<script defer src="js_d3_calendar_view.js"></script>

The div with id line is for a anchor to insert the graphics.

Here's the JavaScript:

// xah commentary
// i think serious dislike d3.js now
// have to decide, either i'm out of it, or, d3's design is epic fail
// don't know enough d3 to certify

var width = 960,
    height = 136,
    cellSize = 17; // cell size

var percent = d3.format(".1%"),
    format = d3.time.format("%Y-%m-%d");

var color = d3.scale.quantize()
    .domain([-.05, .05])
    .range(d3.range(11).map(function(d) { return "q" + d + "-11"; }));

var svg = d3.select("#d3_calendar_demo_22057").selectAll("svg")
    .data(d3.range(1990, 2011))
  .enter().append("svg")
    .attr("width", width)
    .attr("height", height)
    .attr("class", "RdYlGn")
  .append("g")
    .attr("transform", "translate(" + ((width - cellSize * 53) / 2) + "," + (height - cellSize * 7 - 1) + ")");

svg.append("text")
    .attr("transform", "translate(-6," + cellSize * 3.5 + ")rotate(-90)")
    .style("text-anchor", "middle")
    .text(function(d) { return d; });

var rect = svg.selectAll(".day")
    .data(function(d) { return d3.time.days(new Date(d, 0, 1), new Date(d + 1, 0, 1)); })
  .enter().append("rect")
    .attr("class", "day")
    .attr("width", cellSize)
    .attr("height", cellSize)
    .attr("x", function(d) { return d3.time.weekOfYear(d) * cellSize; })
    .attr("y", function(d) { return d.getDay() * cellSize; })
    .datum(format);

rect.append("title")
    .text(function(d) { return d; });

svg.selectAll(".month")
    .data(function(d) { return d3.time.months(new Date(d, 0, 1), new Date(d + 1, 0, 1)); })
  .enter().append("path")
    .attr("class", "month")
    .attr("d", monthPath);

d3.csv("js_d3_calendar_view.csv", function(error, csv) {
  if (error) throw error;

  var data = d3.nest()
    .key(function(d) { return d.Date; })
    .rollup(function(d) { return (d[0].Close - d[0].Open) / d[0].Open; })
    .map(csv);

  rect.filter(function(d) { return d in data; })
      .attr("class", function(d) { return "day " + color(data[d]); })
    .select("title")
      .text(function(d) { return d + ": " + percent(data[d]); });
});

// omg, raw svg path pen command
function monthPath(t0) {
  var t1 = new Date(t0.getFullYear(), t0.getMonth() + 1, 0),
      d0 = t0.getDay(), w0 = d3.time.weekOfYear(t0),
      d1 = t1.getDay(), w1 = d3.time.weekOfYear(t1);
  return "M" + (w0 + 1) * cellSize + "," + d0 * cellSize
      + "H" + w0 * cellSize + "V" + 7 * cellSize
      + "H" + w1 * cellSize + "V" + (d1 + 1) * cellSize
      + "H" + (w1 + 1) * cellSize + "V" + 0
      + "H" + (w0 + 1) * cellSize + "Z";
}

original source http://bl.ocks.org/mbostock/4063318 by Mike Bostock.

If you have a question, put $5 at patreon and message me.