mbostock/.block

## .block
license: gpl-3.0
redirect: https://observablehq.com/@d3/vector-tiles

## README.md

      
    Raw
  

              README.md
            
          
    Adapting d3-tile to show Mapzen vector tiles. See also the static example.
Map tiles © OpenStreetMap contributors, Who’s On First.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  margin: 0;
}

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

.layer {
  position: absolute;
  will-change: transform;
}

.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;
}

</style>
<body>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/d3-tile.v0.0.min.js"></script>
<script>

var pi = Math.PI,
    tau = 2 * pi;

var width = Math.max(960, window.innerWidth),
    height = Math.max(500, window.innerHeight);

// Initialize the projection to fit the world in a 1×1 square centered at the origin.
var projection = d3.geoMercator()
    .scale(1 / tau)
    .translate([0, 0]);

var path = d3.geoPath()
    .projection(projection);

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

var zoom = d3.zoom()
    .scaleExtent([1 << 20, 1 << 23])
    .on("zoom", zoomed);

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

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

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

// Compute the projected initial center.
var center = projection([-74.0064, 40.7142]);

// Apply a zoom transform equivalent to projection.{scale,translate,center}.
map .call(zoom)
    .call(zoom.transform, d3.zoomIdentity
        .translate(width / 2, height / 2)
        .scale(1 << 20)
        .translate(-center[0], -center[1]));

function zoomed() {
  var transform = d3.event.transform;

  var tiles = tile
      .scale(transform.k)
      .translate([transform.x, transform.y])
      ();

  projection
      .scale(transform.k / tau)
      .translate([transform.x, transform.y]);

  var image = layer
      .style("transform", stringify(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) { this._xhr = render(d, this); });
}

function render(d, node) {
  return d3.json("https://vector.mapzen.com/osm/roads/" + d[2] + "/" + d[0] + "/" + d[1] + ".json?api_key=vector-tiles-LM25tq4", function(error, json) {
    if (error) throw error;
    var k = Math.pow(2, d[2]) * 256; // size of the world in pixels

    d3.select(node).selectAll("path")
      .data(json.features.sort(function(a, b) { return a.properties.sort_key - b.properties.sort_key; }))
      .enter().append("path")
        .attr("class", function(d) { return d.properties.kind; })
        .attr("d", d3.geoPath()
            .projection(d3.geoMercator()
                .scale(k / tau)
                .translate([k / 2 - d[0] * 256, k / 2 - d[1] * 256])
                .precision(0)));
  });
}

function stringify(scale, translate) {
  var k = scale / 256, r = scale % 1 ? Number : Math.round;
  return "matrix3d(" + [k, 0, 0, 0, 0, k, 0, 0, 0, 0, k, 0, r(translate[0] * scale), r(translate[1] * scale), 0, 1 ] + ")";
}

function mousemoved() {
  info.text(formatLocation(projection.invert(d3.mouse(this)), d3.zoomTransform(this).k));
}

function formatLocation(p, k) {
  var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f");
  return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " "
       + (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E");
}

</script>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	license: gpl-3.0
	redirect: https://observablehq.com/@d3/vector-tiles
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	margin: 0;
	}

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

	.layer {
	position: absolute;
	will-change: transform;
	}

	.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;
	}

	</style>
	<body>
	<script src="//d3js.org/d3.v4.min.js"></script>
	<script src="//d3js.org/d3-tile.v0.0.min.js"></script>
	<script>

	var pi = Math.PI,
	tau = 2 * pi;

	var width = Math.max(960, window.innerWidth),
	height = Math.max(500, window.innerHeight);

	// Initialize the projection to fit the world in a 1×1 square centered at the origin.
	var projection = d3.geoMercator()
	.scale(1 / tau)
	.translate([0, 0]);

	var path = d3.geoPath()
	.projection(projection);

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

	var zoom = d3.zoom()
	.scaleExtent([1 << 20, 1 << 23])
	.on("zoom", zoomed);

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

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

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

	// Compute the projected initial center.
	var center = projection([-74.0064, 40.7142]);

	// Apply a zoom transform equivalent to projection.{scale,translate,center}.
	map .call(zoom)
	.call(zoom.transform, d3.zoomIdentity
	.translate(width / 2, height / 2)
	.scale(1 << 20)
	.translate(-center[0], -center[1]));

	function zoomed() {
	var transform = d3.event.transform;

	var tiles = tile
	.scale(transform.k)
	.translate([transform.x, transform.y])
	();

	projection
	.scale(transform.k / tau)
	.translate([transform.x, transform.y]);

	var image = layer
	.style("transform", stringify(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) { this._xhr = render(d, this); });
	}

	function render(d, node) {
	return d3.json("https://vector.mapzen.com/osm/roads/" + d[2] + "/" + d[0] + "/" + d[1] + ".json?api_key=vector-tiles-LM25tq4", function(error, json) {
	if (error) throw error;
	var k = Math.pow(2, d[2]) * 256; // size of the world in pixels

	d3.select(node).selectAll("path")
	.data(json.features.sort(function(a, b) { return a.properties.sort_key - b.properties.sort_key; }))
	.enter().append("path")
	.attr("class", function(d) { return d.properties.kind; })
	.attr("d", d3.geoPath()
	.projection(d3.geoMercator()
	.scale(k / tau)
	.translate([k / 2 - d[0] * 256, k / 2 - d[1] * 256])
	.precision(0)));
	});
	}

	function stringify(scale, translate) {
	var k = scale / 256, r = scale % 1 ? Number : Math.round;
	return "matrix3d(" + [k, 0, 0, 0, 0, k, 0, 0, 0, 0, k, 0, r(translate[0] * scale), r(translate[1] * scale), 0, 1 ] + ")";
	}

	function mousemoved() {
	info.text(formatLocation(projection.invert(d3.mouse(this)), d3.zoomTransform(this).k));
	}

	function formatLocation(p, k) {
	var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f");
	return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " "
	+ (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E");
	}

	</script>