mbostock/.block

## .block
license: gpl-3.0

## README.md

      
    Raw
  

              README.md
            
          
    Part of a series of examples. See:

mousewheel-zoom + click-to-center via projection
click-to-center via projection
click-to-center via transform
click-to-zoom via transform

More recently, see the Zoom to Bounding Box example.

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

.background {
  fill: none;
  pointer-events: all;
}

#states {
  fill: #aaa;
}

#states .active {
  fill: orange;
}

#state-borders {
  fill: none;
  stroke: #fff;
  stroke-width: 1.5px;
  stroke-linejoin: round;
  stroke-linecap: round;
  pointer-events: none;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500,
    centered;

var projection = d3.geo.albersUsa()
    .scale(1070)
    .translate([width / 2, height / 2]);

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

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

svg.append("rect")
    .attr("class", "background")
    .attr("width", width)
    .attr("height", height)
    .on("click", clicked);

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

d3.json("/mbostock/raw/4090846/us.json", function(error, us) {
  if (error) throw error;

  g.append("g")
      .attr("id", "states")
    .selectAll("path")
      .data(topojson.feature(us, us.objects.states).features)
    .enter().append("path")
      .attr("d", path)
      .on("click", clicked);

  g.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
      .attr("id", "state-borders")
      .attr("d", path);
});

function clicked(d) {
  var x, y, k;

  if (d && centered !== d) {
    var centroid = path.centroid(d);
    x = centroid[0];
    y = centroid[1];
    k = 4;
    centered = d;
  } else {
    x = width / 2;
    y = height / 2;
    k = 1;
    centered = null;
  }

  g.selectAll("path")
      .classed("active", centered && function(d) { return d === centered; });

  g.transition()
      .duration(750)
      .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")scale(" + k + ")translate(" + -x + "," + -y + ")")
      .style("stroke-width", 1.5 / k + "px");
}

</script>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.background {
	fill: none;
	pointer-events: all;
	}

	#states {
	fill: #aaa;
	}

	#states .active {
	fill: orange;
	}

	#state-borders {
	fill: none;
	stroke: #fff;
	stroke-width: 1.5px;
	stroke-linejoin: round;
	stroke-linecap: round;
	pointer-events: none;
	}

	</style>
	<body>
	<script src="//d3js.org/d3.v3.min.js"></script>
	<script src="//d3js.org/topojson.v1.min.js"></script>
	<script>

	var width = 960,
	height = 500,
	centered;

	var projection = d3.geo.albersUsa()
	.scale(1070)
	.translate([width / 2, height / 2]);

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

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

	svg.append("rect")
	.attr("class", "background")
	.attr("width", width)
	.attr("height", height)
	.on("click", clicked);

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

	d3.json("/mbostock/raw/4090846/us.json", function(error, us) {
	if (error) throw error;

	g.append("g")
	.attr("id", "states")
	.selectAll("path")
	.data(topojson.feature(us, us.objects.states).features)
	.enter().append("path")
	.attr("d", path)
	.on("click", clicked);

	g.append("path")
	.datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
	.attr("id", "state-borders")
	.attr("d", path);
	});

	function clicked(d) {
	var x, y, k;

	if (d && centered !== d) {
	var centroid = path.centroid(d);
	x = centroid[0];
	y = centroid[1];
	k = 4;
	centered = d;
	} else {
	x = width / 2;
	y = height / 2;
	k = 1;
	centered = null;
	}

	g.selectAll("path")
	.classed("active", centered && function(d) { return d === centered; });

	g.transition()
	.duration(750)
	.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")scale(" + k + ")translate(" + -x + "," + -y + ")")
	.style("stroke-width", 1.5 / k + "px");
	}

	</script>