mbostock/.block

## .block
license: gpl-3.0

## README.md

      
    Raw
  

              README.md
            
          
    What D3’s Albers projection would look like without antimeridian cutting.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<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 rotation = d3.geo.rotation([0, 0]);

var λ = d3.scale.linear()
    .domain([100, width - 100])
    .range([-180, 180]);

var φ = d3.scale.linear()
    .domain([100, height - 100])
    .range([90, -90]);

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(conicEqualArea(150, [width * .5, height * .69]))
    .context(context);

d3.json("/mbostock/raw/4090846/world-110m.json", function(error, world) {
  if (error) throw error;

  var land = topojson.feature(world, world.objects.land),
      sphere = {type: "Sphere"},
      touch = "ontouchstart" in window;

  canvas.on(touch ? "touchmove" : "mousemove", move);

  draw();

  function move() {
    var p = touch ? d3.touches(this)[0] : d3.mouse(this);
    rotation = d3.geo.rotation([λ(p[0]), φ(p[1])]);
    draw();
    d3.event.preventDefault();
  }

  function draw() {
    context.clearRect(0, 0, width, height);
    context.beginPath();
    path(land);
    context.fill();
  }
});

function conicEqualArea(scale, translate) {
  var projection = d3.geo.conicEqualArea.raw(0, Math.PI / 3);
  return {
    stream: function(output) {
      return {
        point: function(x, y) {
          xy = rotation([x, y]);
          xy = [xy[0] * Math.PI / 180, xy[1] * Math.PI / 180];
          xy = projection(xy[0], xy[1]);
          output.point(xy[0] * scale + translate[0], translate[1] - xy[1] * scale);
        },
        sphere: function() { output.sphere(); },
        lineStart: function() { output.lineStart(); },
        lineEnd: function() { output.lineEnd(); },
        polygonStart: function() { output.polygonStart(); },
        polygonEnd: function() { output.polygonEnd(); }
      };
    }
  };
}

</script>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	<!DOCTYPE html>
	<meta charset="utf-8">
	<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 rotation = d3.geo.rotation([0, 0]);

	var λ = d3.scale.linear()
	.domain([100, width - 100])
	.range([-180, 180]);

	var φ = d3.scale.linear()
	.domain([100, height - 100])
	.range([90, -90]);

	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(conicEqualArea(150, [width * .5, height * .69]))
	.context(context);

	d3.json("/mbostock/raw/4090846/world-110m.json", function(error, world) {
	if (error) throw error;

	var land = topojson.feature(world, world.objects.land),
	sphere = {type: "Sphere"},
	touch = "ontouchstart" in window;

	canvas.on(touch ? "touchmove" : "mousemove", move);

	draw();

	function move() {
	var p = touch ? d3.touches(this)[0] : d3.mouse(this);
	rotation = d3.geo.rotation([λ(p[0]), φ(p[1])]);
	draw();
	d3.event.preventDefault();
	}

	function draw() {
	context.clearRect(0, 0, width, height);
	context.beginPath();
	path(land);
	context.fill();
	}
	});

	function conicEqualArea(scale, translate) {
	var projection = d3.geo.conicEqualArea.raw(0, Math.PI / 3);
	return {
	stream: function(output) {
	return {
	point: function(x, y) {
	xy = rotation([x, y]);
	xy = [xy[0] * Math.PI / 180, xy[1] * Math.PI / 180];
	xy = projection(xy[0], xy[1]);
	output.point(xy[0] * scale + translate[0], translate[1] - xy[1] * scale);
	},
	sphere: function() { output.sphere(); },
	lineStart: function() { output.lineStart(); },
	lineEnd: function() { output.lineEnd(); },
	polygonStart: function() { output.polygonStart(); },
	polygonEnd: function() { output.polygonEnd(); }
	};
	}
	};
	}

	</script>