mbostock/.block

## .block
license: gpl-3.0
redirect: https://observablehq.com/@d3/zoomable-tiles?collection=@d3/d3-tile

## d3.geo.tile.min.js
d3.geo.tile=function(){function t(){var t=Math.max(Math.log(n)/Math.LN2-8,0),h=Math.round(t+e),o=Math.pow(2,t-h+8),u=[(r[0]-n/2)/o,(r[1]-n/2)/o],l=[],c=d3.range(Math.max(0,Math.floor(-u[0])),Math.max(0,Math.ceil(a[0]/o-u[0]))),M=d3.range(Math.max(0,Math.floor(-u[1])),Math.max(0,Math.ceil(a[1]/o-u[1])));return M.forEach(function(t){c.forEach(function(a){l.push([a,t,h])})}),l.translate=u,l.scale=o,l}var a=[960,500],n=256,r=[a[0]/2,a[1]/2],e=0;return t.size=function(n){return arguments.length?(a=n,t):a},t.scale=function(a){return arguments.length?(n=a,t):n},t.translate=function(a){return arguments.length?(r=a,t):r},t.zoomDelta=function(a){return arguments.length?(e=+a,t):e},t};

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

body {
  margin: 0;
}

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

.tiles {
  position: absolute;
}

.tile {
  pointer-events: none;
  position: absolute;
  width: 256px;
  height: 256px;
  border-top: solid 1px red;
  border-left: solid 1px red;
  font: 13px sans-serif;
  padding: 10px;
  box-sizing: border-box;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="d3.geo.tile.min.js"></script>
<script>

var width = Math.max(960, window.innerWidth),
    height = Math.max(500, window.innerHeight),
    transform = ["", "-webkit-", "-moz-", "-ms-", "-o-"].reduce(function(p, v) { return v + "transform" in document.body.style ? v : p; }) + "transform";

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

var projection = d3.geo.mercator();

var zoom = d3.behavior.zoom()
    .scale(1 << 12)
    .scaleExtent([1 << 9, 1 << 23])
    .translate([width / 2, height / 2])
    .on("zoom", zoomed);

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

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

zoomed();

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

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

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

  tile.exit()
      .remove();

  tile.enter().append("div")
      .attr("class", "tile")
      .style("left", function(d) { return (d[0] << 8) + "px"; })
      .style("top", function(d) { return (d[1] << 8) + "px"; })
      .text(function(d) { return d.join("/"); });
}

function matrix3d(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] + ")";
}

</script>

## thumbnail.png

      
    Raw
  

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

	body {
	margin: 0;
	}

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

	.tiles {
	position: absolute;
	}

	.tile {
	pointer-events: none;
	position: absolute;
	width: 256px;
	height: 256px;
	border-top: solid 1px red;
	border-left: solid 1px red;
	font: 13px sans-serif;
	padding: 10px;
	box-sizing: border-box;
	}

	</style>
	<body>
	<script src="//d3js.org/d3.v3.min.js"></script>
	<script src="d3.geo.tile.min.js"></script>
	<script>

	var width = Math.max(960, window.innerWidth),
	height = Math.max(500, window.innerHeight),
	transform = ["", "-webkit-", "-moz-", "-ms-", "-o-"].reduce(function(p, v) { return v + "transform" in document.body.style ? v : p; }) + "transform";

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

	var projection = d3.geo.mercator();

	var zoom = d3.behavior.zoom()
	.scale(1 << 12)
	.scaleExtent([1 << 9, 1 << 23])
	.translate([width / 2, height / 2])
	.on("zoom", zoomed);

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

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

	zoomed();

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

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

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

	tile.exit()
	.remove();

	tile.enter().append("div")
	.attr("class", "tile")
	.style("left", function(d) { return (d[0] << 8) + "px"; })
	.style("top", function(d) { return (d[1] << 8) + "px"; })
	.text(function(d) { return d.join("/"); });
	}

	function matrix3d(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] + ")";
	}

	</script>