JSFiddle - React, Tailwind, and code Playground

by Henry

HTML

<script src="http://d3js.org/d3.geo.tile.v0.min.js"></script>
<div id="chart"></div>

CSS

body {
  margin: 0;
}

.map {
  position: relative;
  overflow: hidden;
}

.layer {
  position: absolute;
}

.tile {
  position: absolute;
  width: 256px;
  height: 256px;
}

.tile path {
  fill: none;
  stroke: #000;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.tile .major_road { stroke: #776; }
.tile .minor_road { stroke: #ccb; }
.tile .highway { stroke: #f39; stroke-width: 1.5px; }
.tile .rail { stroke: #7de; }

.info {
  position: absolute;
  bottom: 10px;
  left: 10px;
}

JavaScript

var width = Math.max(960, window.innerWidth),
    height = Math.max(500, window.innerHeight),
    prefix = prefixMatch(["webkit", "ms", "Moz", "O"]);

var tile = d3.geo.tile()
    .size([width, height]);

var projection = d3.geo.mercator()
    .scale((1 << 21) / 2 / Math.PI)
    .translate([-width / 2, -height / 2]); // just temporary

var tileProjection = d3.geo.mercator();

var tilePath = d3.geo.path()
    .projection(tileProjection);

var zoom = d3.behavior.zoom()
    .scale(projection.scale() * 2 * Math.PI)
    .scaleExtent([1 << 15, 1 << 30])
    .translate(projection([-0.1064, 51.7142]).map(function(x) { return -x; }))
    .on("zoom", zoomed);

var map = d3.select("#chart").append("div")
    .attr("class", "map")
    .style("width", width + "px")
    .style("height", height + "px")
    .call(zoom)
    .on("mousemove", mousemoved);

var layer = map.append("div")
    .attr("class", "layer");

var info = map.append("div")
    .attr("class", "info");

zoomed();

function zoomed() {
  var tiles = tile
      .scale(zoom.scale())
      .translate(zoom.translate())
      ();

  projection
      .scale(zoom.scale() / 2 / Math.PI)
      .translate(zoom.translate());

  var image = layer
      .style(prefix + "transform", matrix3d(tiles.scale, tiles.translate))
    .selectAll(".tile")
      .data(tiles, function(d) { return d; });

  image.exit()
      .each(function(d) { this._xhr.abort(); })
      .remove();

  image.enter().append("svg")
      .attr("class", "tile")
      .style("left", function(d) { return d[0] * 256 + "px"; })
      .style("top", function(d) { return d[1] * 256 + "px"; })
      .each(function(d) {
        var svg = d3.select(this);
        this._xhr = d3.json("http://" + ["a", "b", "c"][(d[0] * 31 + d[1]) % 3] + ".tile.openstreetmap.us/vectiles-highroad/" + d[2] + "/" + d[0] + "/" + d[1] + ".json", function(error, json) {
          var k = Math.pow(2, d[2]) * 256; // size of the world in pixels

          tilePath.projection()
             ...