mbostock/.block

## .block
license: gpl-3.0

## README.md

      
    Raw
  

              README.md
            
          
    This map of plant hardiness zones shows the average annual extreme minimum temperature (from 1976-2005) across the contiguous United States. Data via Bill Morris’ Open Plant Hardiness Zones project.

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

body {
  position: relative;
}

.key {
  font: 10px sans-serif;
  position: absolute;
  top: 0;
  left: 0;
}

.caption {
  font-weight: bold;
}

.key path {
  display: none;
}

.key line {
  stroke: #000;
  shape-rendering: crispEdges;
}

</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;

var color = d3.scale.linear()
    .domain([-35, 0, 35])
    .range(["#4575b4", "#ffffbf", "#a50026"])
    .interpolate(d3.interpolateHcl);

var x = d3.scale.linear()
    .domain([-40, 40])
    .range([0, 240]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickSize(13)
    .tickFormat(d3.format("+.0f"));

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

var context = canvas.node().getContext("2d");

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

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .attr("class", "key")
  .append("g")
    .attr("transform", "translate(60," + (height - 60) + ")");

svg.selectAll("rect")
    .data(pair(x.ticks(10)))
  .enter().append("rect")
    .attr("height", 8)
    .attr("x", function(d) { return x(d[0]); })
    .attr("width", function(d) { return x(d[1]) - x(d[0]); })
    .style("fill", function(d) { return color(d[0]); });

svg.call(xAxis).append("text")
    .attr("class", "caption")
    .attr("y", -6)
    .text("Avg. annual extreme minimum temperature, °F");

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

  topojson.feature(ophz, ophz.objects.b)
      .features
      .sort(function(a, b) { return a.t - b.t; })
      .forEach(render);
});

function pair(array) {
  return array.slice(1).map(function(b, i) {
    return [array[i], b];
  });
}

function render(d) {
  var t = d.properties.t;
  if (t <= -98) return;
  context.fillStyle = color(t);
  context.beginPath();
  path(d);
  context.fill();
}

</script>

## ophz.json

      
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              ophz.json
            
          
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## thumbnail.png

      
    Raw
  

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

	body {
	position: relative;
	}

	.key {
	font: 10px sans-serif;
	position: absolute;
	top: 0;
	left: 0;
	}

	.caption {
	font-weight: bold;
	}

	.key path {
	display: none;
	}

	.key line {
	stroke: #000;
	shape-rendering: crispEdges;
	}

	</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;

	var color = d3.scale.linear()
	.domain([-35, 0, 35])
	.range(["#4575b4", "#ffffbf", "#a50026"])
	.interpolate(d3.interpolateHcl);

	var x = d3.scale.linear()
	.domain([-40, 40])
	.range([0, 240]);

	var xAxis = d3.svg.axis()
	.scale(x)
	.orient("bottom")
	.tickSize(13)
	.tickFormat(d3.format("+.0f"));

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

	var context = canvas.node().getContext("2d");

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

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height)
	.attr("class", "key")
	.append("g")
	.attr("transform", "translate(60," + (height - 60) + ")");

	svg.selectAll("rect")
	.data(pair(x.ticks(10)))
	.enter().append("rect")
	.attr("height", 8)
	.attr("x", function(d) { return x(d[0]); })
	.attr("width", function(d) { return x(d[1]) - x(d[0]); })
	.style("fill", function(d) { return color(d[0]); });

	svg.call(xAxis).append("text")
	.attr("class", "caption")
	.attr("y", -6)
	.text("Avg. annual extreme minimum temperature, °F");

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

	topojson.feature(ophz, ophz.objects.b)
	.features
	.sort(function(a, b) { return a.t - b.t; })
	.forEach(render);
	});

	function pair(array) {
	return array.slice(1).map(function(b, i) {
	return [array[i], b];
	});
	}

	function render(d) {
	var t = d.properties.t;
	if (t <= -98) return;
	context.fillStyle = color(t);
	context.beginPath();
	path(d);
	context.fill();
	}

	</script>