How to make a heat map like GitHub's commit chart with D3.js

app.js

// first, initialize the variables that are independent of the data
var margin = { top: 30, right: 10, bottom: 30, left: 30 },
    width = 1000 - margin.left - margin.right,
    gridSize = Math.floor(width / 53),
    height = (gridSize * 10) - margin.top - margin.bottom,
    // legendElementWidth = gridSize * 3,

    days = ["M", "T", "W", "T", "F"],
    weeks = ["", "J", "", "", "", "F", "", "", "", "M", "", "", "", "", "A", "", "", "", "M", "", "", "", "J", "", "", "", "", "J", "", "", "", "A", "", "", "", "S", "", "", "", "", "O", "", "", "", "N", "", "", "", "D", "", "", "", "" ],
    values = ['hike', 'bike', 'swim', 'run', 'stretch', 'climb', 'lift'],
    colors = ["#D500F9", "#651FFF", "#00B8D4", "#64DD17", "#FFD600", "#FF6D00", "#FF1744"];

var svg = d3.select("#chart").append("svg") // attach chart to the DOM and center it within an svg element based on margins
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g") // an svg "group", similar to an html "div"
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// var colorScale = d3.scale.ordinal() // map array of values to array of colors
//     .domain(values) // move this inside of data callback and change this to newValues if you use option code to generate domain from the data
//     .range(colors);

// var dayLabels = svg.selectAll(".day") // add day labels
//     .data(days)
//     .enter().append("text")
//       .text(function (d) { return d; })
//       .attr("x", 0)
//       .attr("y", function (d, i) { return i * gridSize; })
//       .style("text-anchor", "end")
//       .attr("transform", "translate(-6," + gridSize / 1.3 + ")")
//       .attr("class", "label");

// var weekLabels = svg.selectAll(".week") // add week labels
//     .data(weeks)
//     .enter().append("text")
//       .text(function(d) { return d; })
//       .attr("x", function(d, i) { return i * gridSize; })
//       .attr("y", 0)
//       .style("text-anchor", "middle")
//       .attr("transform", "translate(" + gridSize / 2 + ", -6)")
//       .attr("class", "label");

// d3.tsv("heat-map-sample-data.tsv", // Data parsing! Your data here: ('path', callback(), callback())
//   function(d) { // in the first cb you construct your data object
//     day = moment(d.date, "MM/DD/YYYY").day()
//     week = moment(d.date, "MM/DD/YYYY").week()
//     return {
//       // date: d.date,
//       day: day,
//       week: week,
//       type: d.type
//     };
//   },
//   function(error, data) { // this callback is the meat of your graphic, data will be undefined outside of this function
//     if (error) {console.log(error);}

    // var newValues = [] // optional code to generate color domain from the data
    // // make an object first
    // var valueObj = data.reduce(function (obj, key) {
    //   obj[key.type] = 0
    //   return obj
    // }, {})
    // for (key in valueObj) {
    //   newValues.push(key)
    // }
    // newValues.sort()
    // console.log(newValues);


    var heatMap = svg.selectAll(".grid") // make heatMap with data, data can be a hard coded array or an array of objects brought in through another file
        .data([1]) // play with this, but later change this it to the data that is passed in on line 24
        .enter().append("rect")
          .attr("width", gridSize)
          .attr("height", gridSize)
          // .attr("x", function(d) { return (d.week - 1) * gridSize; })
          // .attr("y", function(d) { return (d.day - 1) * gridSize; })
          // .attr("rx", 4)
          // .attr("ry", 4)
          // .attr("class", "bordered")
          // .style("fill", function(d) { return colorScale(d.type);}) // use this line if you are not using the transition() to a new color
          .style("fill", colors[0]); // use this line as a default OR if you are using the transition() to new color

    // heatMap.transition().duration(1000) // example d3 animation
    //     .style("fill", function(d) { return colorScale(d.type); })
    //     .style("fill-opacity", "60%");

    // heatMap.append("title") // append and format title element
    //     .text(function(d) {
    //       var title = d.type + ' ' + d.date
    //       return title;
    //     });

    // var legend = svg.selectAll(".legend") // create legend, legend data is the color domain
    //     .data(colorScale.domain(), function(d) { return d; }) // d is each element in the data
    //     .enter().append("g")
    //       .attr("class", "legend");

    // legend.append("rect") // define legend rectangles
    //   .attr("x", function(d, i) { return legendElementWidth * i; })
    //   .attr("y", gridSize * 6)
    //   .attr("width", legendElementWidth)
    //   .attr("height", gridSize)
    //   .attr("class", "bordered")
    //   .attr("rx", 4)
    //   .attr("ry", 4)
    //   .style("fill", function(d, i) { return colors[i]; }) // map color domain array (d) to color range array
    //   .style("fill-opacity", "60%");


    // legend.append("text") // add legend text labels to same coordinates as legend rectangles, center
    //   .text(function(d) { return d; })
    //   .attr("x", function(d, i) { return (legendElementWidth * i) + legendElementWidth/2; })
    //   .attr("y", (gridSize * 6) + (gridSize/1.4))
    //   .attr("class", "label")
    //   .style("text-anchor", "middle");

// });

D3.js-heat-map-tutorial.md

Make a heat map graphic with D3.js

This gist contains the code to create a simple "heat map" with D3.js. In this case, the "heat map" is a graph showing activity distributed over the days of the week on one axis and the weeks of the year on the other.

This gist is meant to be used as part of a workshop where the code is uncommented as the workshop progresses.

It could also be used as a puzzle outside of a workshop: follow the clues to reconstruct the correct code and make it work!

In the end, the chart should look something like the above image.

Setup

First, fork this gist to your own account by clicking the fork symbol in the upper right.

Then copy the clone URL to your clipboard.

In your terminal, type the git clone command then paste the url you just copied followed by the name of your new directory:

git clone <paste clone url here> <name of new directory here>

EXAMPLE:

git clone https://gist.github.com/d0d636a3f646a60ba5a3.git myD3HeatMapExample

Move (cd) into your new directory

cd myD3HeatMapExample

then open the app.js, index.html, and style.css files in your favorite text editor.

How to open a D3 graphic in the browser

To open the D3 file in your browser, you'll need to run a simple server such as http-server or python SimpleHTTPServer from your new directory.

If you have Node installed try the following command:

http-server -c-1 -o
//run http-server with flags -c-1 (disable caching) and -o (automatically open)

In your browser, you should see a small purple grid square, the beginnings of your heat map. If that doesn't work, try this command:

python -m SimpleHTTPServer

and follow up in your browser by going to http://localhost:8000/.

If neither of those server commands work, more specific intructions for installing a server can be found in the gist here: [TK—link to how to install a simple http server]

Then code along…

d3.min.js

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heat-map-sample-data.tsv

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>D3 Heat Map Example</title>
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</head>
<body>

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</html>

moment.js

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style.css

svg  rect.bordered {
  stroke: white;
  stroke-width: 2px;
}

text.label {
  font-size: 9pt;
  font-family: sans-serif;
  fill: #795548;
}

Ωclone.png

Ωfork.png

ΩheatMapExample.png

In order to run the http-server via node you'll need to install http-server globally:
npm install http-server -g