dbetebenner/.block

## .block
license:gpl-3.0
height:600
border:no

## README.md

      
    Raw
  

              README.md
            
          
    D3 Block-a-Day: Day 11, January, 11th 2017

New Year's Resolution for 2017: Make a D3 Block a day to teach myself D3. This is Number 11. This example
copies Mike Bostock's click-to-zoom via transform block and
wires it up with the Rhode Island district shape file. The topoJSON files used to construct this visualization
were created by me using shape files provided by the United States Census Bureau.
The Center for Assessment makes these
state and national school district topoJSON files available
for anyone to use in their own development.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<head>
<title>D3 Block-a-Day: Day 11, January 11, 2017</title>
<style>

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

#districts {
  fill: #ccc;
}

#districts .active {
  fill: orange;
}

#district-borders {
  fill: none;
  stroke: white;
  stroke-width: 1px;
  stroke-linejoin: round;
  stroke-linecap: round;
  pointer-events: none;
}

.hidden {
  display: none;
}

div.tooltip {
  background-color: #ffffff;
  padding: 7px;
  text-shadow: #f5f5f5 0 1px 0;
  font: 13px Helvetica Neue;
  border: 2.5px solid;
  border-color: black;
	border-radius: 3px;
  opacity: 0.9;
  position: absolute;
  box-shadow: rgba(0, 0, 0, 0.3) 0 2px 10px;
 }
</style>
</head>
<body>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 600,
    centered;

var projection = d3.geoMercator()
			.center([ -71.5, 41.7 ])
			.scale(24000);

var path = d3.geoPath()
    .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 tooltip = d3.select('body').append('div')
      .attr('class', 'hidden tooltip');

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

d3.json("RI_Districts.json", function(error, state_districts) {
  if (error) throw error;

  g.append("g")
      .attr("id", "districts")
    .selectAll("path")
      .data(topojson.feature(state_districts, state_districts.objects.districts).features)
    .enter().append("path")
      .attr("d", path)
      .on("click", clicked)
      .on('mousemove', function(d) {
           var mouse = d3.mouse(svg.node()).map(function(d) {
                return parseInt(d);
         });
         tooltip.classed('hidden', false)
                .attr('style', 'left:' + (mouse[0] + 10) +'px; top:' + (mouse[1] - 20) + 'px')
                .html(d.properties.District);
         })
         .on('mouseout', function() {
                tooltip.classed('hidden', true);
         });;
  g.append("path")
      .datum(topojson.mesh(state_districts, state_districts.objects.districts, function(a, b) { return a !== b; }))
      .attr("id", "district-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>

## preview.png

      
    Raw
  

              preview.png
            
          
## RI_Districts.json

      
Display the source blob

    
Display the rendered blob

    
    Raw
  

              RI_Districts.json
            
          
      Sorry, something went wrong. Reload?
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## thumbnail.png

      
    Raw
  

              thumbnail.png
	<!DOCTYPE html>
	<meta charset="utf-8">
	<head>
	<title>D3 Block-a-Day: Day 11, January 11, 2017</title>
	<style>

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

	#districts {
	fill: #ccc;
	}

	#districts .active {
	fill: orange;
	}

	#district-borders {
	fill: none;
	stroke: white;
	stroke-width: 1px;
	stroke-linejoin: round;
	stroke-linecap: round;
	pointer-events: none;
	}

	.hidden {
	display: none;
	}

	div.tooltip {
	background-color: #ffffff;
	padding: 7px;
	text-shadow: #f5f5f5 0 1px 0;
	font: 13px Helvetica Neue;
	border: 2.5px solid;
	border-color: black;
	border-radius: 3px;
	opacity: 0.9;
	position: absolute;
	box-shadow: rgba(0, 0, 0, 0.3) 0 2px 10px;
	}
	</style>
	</head>
	<body>
	<script src="//d3js.org/d3.v4.min.js"></script>
	<script src="//d3js.org/topojson.v1.min.js"></script>
	<script>

	var width = 960,
	height = 600,
	centered;

	var projection = d3.geoMercator()
	.center([ -71.5, 41.7 ])
	.scale(24000);

	var path = d3.geoPath()
	.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 tooltip = d3.select('body').append('div')
	.attr('class', 'hidden tooltip');

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

	d3.json("RI_Districts.json", function(error, state_districts) {
	if (error) throw error;

	g.append("g")
	.attr("id", "districts")
	.selectAll("path")
	.data(topojson.feature(state_districts, state_districts.objects.districts).features)
	.enter().append("path")
	.attr("d", path)
	.on("click", clicked)
	.on('mousemove', function(d) {
	var mouse = d3.mouse(svg.node()).map(function(d) {
	return parseInt(d);
	});
	tooltip.classed('hidden', false)
	.attr('style', 'left:' + (mouse[0] + 10) +'px; top:' + (mouse[1] - 20) + 'px')
	.html(d.properties.District);
	})
	.on('mouseout', function() {
	tooltip.classed('hidden', true);
	});;
	g.append("path")
	.datum(topojson.mesh(state_districts, state_districts.objects.districts, function(a, b) { return a !== b; }))
	.attr("id", "district-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>