jatorre/README.md

## README.md

      
    Raw
  

              README.md
            
          
    A demo of the d3.geo.tile plugin, which determines which 256x256 tiles are visible in the viewport based on a scale and translate. This demo combines the tile plugin with d3.behavior.zoom for panning and zooming, resulting in a a simple slippy map. Based partly on an example by Tom MacWright.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="https://raw.github.com/d3/d3-plugins/master/geo/tile/tile.js"></script>
<script>

var width = 960,
    height = 500;

var tile = d3.geo.tile();

var zoom = d3.behavior.zoom()
    .scale(1024)
    .translate([width / 2, height / 2])
    .on("zoom", zoomed);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .call(zoom);

var g = svg.append("g");

zoomed();

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

  var image = g
      .attr("transform", function(d) { return "scale(" + tiles.scale + ")translate(" + tiles.translate + ")"; })
    .selectAll("image")
      .data(tiles, function(d) { return d; });

  image.exit()
      .remove();

  image.enter().append("image")
      .attr("xlink:href", function(d) { return "http://2.tiles.cartocdn.com/jatorre-beta/tiles/regions/" + d[2] + "/" + d[0] + "/" + d[1] + ".png?sql=SELECT%20*%20FROM%20regions&cache_buster=2012-11-22T12:37:07+01:00&cache_policy=persist&interactivity=cartodb_id%2Coriginal_c"; })
      .attr("width", 1)
      .attr("height", 1)
      .attr("x", function(d) { return d[0]; })
      .attr("y", function(d) { return d[1]; });
}

</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="https://raw.github.com/d3/d3-plugins/master/geo/tile/tile.js"></script>
	<script>

	var width = 960,
	height = 500;

	var tile = d3.geo.tile();

	var zoom = d3.behavior.zoom()
	.scale(1024)
	.translate([width / 2, height / 2])
	.on("zoom", zoomed);

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height)
	.call(zoom);

	var g = svg.append("g");

	zoomed();

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

	var image = g
	.attr("transform", function(d) { return "scale(" + tiles.scale + ")translate(" + tiles.translate + ")"; })
	.selectAll("image")
	.data(tiles, function(d) { return d; });

	image.exit()
	.remove();

	image.enter().append("image")
	.attr("xlink:href", function(d) { return "http://2.tiles.cartocdn.com/jatorre-beta/tiles/regions/" + d[2] + "/" + d[0] + "/" + d[1] + ".png?sql=SELECT%20*%20FROM%20regions&cache_buster=2012-11-22T12:37:07+01:00&cache_policy=persist&interactivity=cartodb_id%2Coriginal_c"; })
	.attr("width", 1)
	.attr("height", 1)
	.attr("x", function(d) { return d[0]; })
	.attr("y", function(d) { return d[1]; });
	}

	</script>