davejm/README.md

## readme-world-110m.json

      
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## README.md

      
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              README.md
            
          
    A version of Mike Bostock’s animated world countries, which uses a more
accurate spherical interpolation.

  
## custom-tour.json
{
  "countries": [
    {
      "name": "United Kingdom",
      "subText": "God save the Queen"
    },
    {
      "name": "South Africa",
      "subText": "This is South Africa"
    },
    {
      "name": "France",
      "subText": "Bonjour"
    },
    {
      "name": "Saudi Arabia",
      "subText": "Go Dubai!"
    }
  ]
}

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

.country {
  fill: #b8b8b8;
  stroke: #fff;
  stroke-width: .5px;
  stroke-linejoin: round;
}

.graticule {
  fill: none;
  stroke: #000;
  stroke-opacity: .3;
  stroke-width: .5px;
}

.graticule-outline {
  fill: none;
  stroke: #333;
  stroke-width: 1.5px;
}

text {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 18px;
  font-weight: bold;
  text-anchor: middle;
}

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v0.min.js"></script>
<script>

var width = 960,
    height = 500;

var centroid = d3.geo.path()
    .projection(function(d) { return d; })
    .centroid;

var projection = d3.geo.orthographic()
    .scale(248)
    .clipAngle(90);

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

var graticule = d3.geo.graticule()
    .extent([[-180, -90], [180 - .1, 90 - .1]]);

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

var line = svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);

svg.append("circle")
    .attr("class", "graticule-outline")
    .attr("cx", width / 2)
    .attr("cy", height / 2)
    .attr("r", projection.scale());

var title = svg.append("text")
    .attr("x", width / 2)
    .attr("y", height * 3 / 5);

var subTitle = svg.append("text")
    .attr("x", width / 2)
    .attr("y", height * 3 / 5 + 30)
    .style("font-size", "15px");

var rotate = d3_geo_greatArcInterpolator();


function go() {
  loadJSON(function(tour, world) {
    console.log(tour);
    console.log(world);

    var countryNames = [];
    world.objects.countries.geometries.forEach(function(obj) {
      countryNames.push(obj.id);
    })

    for (var i=0; i < tour.countries.length; i++) {
      tour.countries[i].geometryIndex = countryNames.indexOf(tour.countries[i].name);
    }

    var countries = topojson.object(world, world.objects.countries).geometries,
      i = -1,
      n = tour.countries.length;

    var country = svg.selectAll(".country")
        .data(countries)
      .enter().insert("path", ".graticule")
        .attr("class", "country")
        .attr("d", path);

    step();

    function step() {
      if (++i >= n) i = 0;

      title.text(tour.countries[i].name);
      subTitle.text(tour.countries[i].subText);
      var geometryIndex = tour.countries[i].geometryIndex;

      country.transition()
          .style("fill", function(d, j) { return j === geometryIndex ? "red" : "#b8b8b8"; });

      d3.transition()
          .delay(250)
          .duration(1250)
          .tween("rotate", function() {
            var point = centroid(countries[geometryIndex]);
            rotate.source(projection.rotate()).target([-point[0], -point[1]]).distance();
            return function(t) {
              projection.rotate(rotate(t));
              country.attr("d", path);
              line.attr("d", path);
            };
          })
        .transition()
          .each("end", step);
    }
  });
}

function loadJSON(cb) {
  d3.json("readme-world-110m.json", function(error, world) {
    d3.json("custom-tour.json", function(error, tour) {
      cb(tour, world);
    })
  })
}

go();


var d3_radians = Math.PI / 180;

function d3_geo_greatArcInterpolator() {
  var x0, y0, cy0, sy0, kx0, ky0,
      x1, y1, cy1, sy1, kx1, ky1,
      d,
      k;

  function interpolate(t) {
    var B = Math.sin(t *= d) * k,
        A = Math.sin(d - t) * k,
        x = A * kx0 + B * kx1,
        y = A * ky0 + B * ky1,
        z = A * sy0 + B * sy1;
    return [
      Math.atan2(y, x) / d3_radians,
      Math.atan2(z, Math.sqrt(x * x + y * y)) / d3_radians
    ];
  }

  interpolate.distance = function() {
    if (d == null) k = 1 / Math.sin(d = Math.acos(Math.max(-1, Math.min(1, sy0 * sy1 + cy0 * cy1 * Math.cos(x1 - x0)))));
    return d;
  };

  interpolate.source = function(_) {
    var cx0 = Math.cos(x0 = _[0] * d3_radians),
        sx0 = Math.sin(x0);
    cy0 = Math.cos(y0 = _[1] * d3_radians);
    sy0 = Math.sin(y0);
    kx0 = cy0 * cx0;
    ky0 = cy0 * sx0;
    d = null;
    return interpolate;
  };

  interpolate.target = function(_) {
    var cx1 = Math.cos(x1 = _[0] * d3_radians),
        sx1 = Math.sin(x1);
    cy1 = Math.cos(y1 = _[1] * d3_radians);
    sy1 = Math.sin(y1);
    kx1 = cy1 * cx1;
    ky1 = cy1 * sx1;
    d = null;
    return interpolate;
  };

  return interpolate;
}

</script>
	{
	"countries": [
	{
	"name": "United Kingdom",
	"subText": "God save the Queen"
	},
	{
	"name": "South Africa",
	"subText": "This is South Africa"
	},
	{
	"name": "France",
	"subText": "Bonjour"
	},
	{
	"name": "Saudi Arabia",
	"subText": "Go Dubai!"
	}
	]
	}
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.country {
	fill: #b8b8b8;
	stroke: #fff;
	stroke-width: .5px;
	stroke-linejoin: round;
	}

	.graticule {
	fill: none;
	stroke: #000;
	stroke-opacity: .3;
	stroke-width: .5px;
	}

	.graticule-outline {
	fill: none;
	stroke: #333;
	stroke-width: 1.5px;
	}

	text {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	font-size: 18px;
	font-weight: bold;
	text-anchor: middle;
	}

	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="http://d3js.org/topojson.v0.min.js"></script>
	<script>

	var width = 960,
	height = 500;

	var centroid = d3.geo.path()
	.projection(function(d) { return d; })
	.centroid;

	var projection = d3.geo.orthographic()
	.scale(248)
	.clipAngle(90);

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

	var graticule = d3.geo.graticule()
	.extent([[-180, -90], [180 - .1, 90 - .1]]);

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

	var line = svg.append("path")
	.datum(graticule)
	.attr("class", "graticule")
	.attr("d", path);

	svg.append("circle")
	.attr("class", "graticule-outline")
	.attr("cx", width / 2)
	.attr("cy", height / 2)
	.attr("r", projection.scale());

	var title = svg.append("text")
	.attr("x", width / 2)
	.attr("y", height * 3 / 5);

	var subTitle = svg.append("text")
	.attr("x", width / 2)
	.attr("y", height * 3 / 5 + 30)
	.style("font-size", "15px");

	var rotate = d3_geo_greatArcInterpolator();



	function go() {
	loadJSON(function(tour, world) {
	console.log(tour);
	console.log(world);

	var countryNames = [];
	world.objects.countries.geometries.forEach(function(obj) {
	countryNames.push(obj.id);
	})

	for (var i=0; i < tour.countries.length; i++) {
	tour.countries[i].geometryIndex = countryNames.indexOf(tour.countries[i].name);
	}

	var countries = topojson.object(world, world.objects.countries).geometries,
	i = -1,
	n = tour.countries.length;

	var country = svg.selectAll(".country")
	.data(countries)
	.enter().insert("path", ".graticule")
	.attr("class", "country")
	.attr("d", path);

	step();

	function step() {
	if (++i >= n) i = 0;

	title.text(tour.countries[i].name);
	subTitle.text(tour.countries[i].subText);
	var geometryIndex = tour.countries[i].geometryIndex;

	country.transition()
	.style("fill", function(d, j) { return j === geometryIndex ? "red" : "#b8b8b8"; });

	d3.transition()
	.delay(250)
	.duration(1250)
	.tween("rotate", function() {
	var point = centroid(countries[geometryIndex]);
	rotate.source(projection.rotate()).target([-point[0], -point[1]]).distance();
	return function(t) {
	projection.rotate(rotate(t));
	country.attr("d", path);
	line.attr("d", path);
	};
	})
	.transition()
	.each("end", step);
	}
	});
	}

	function loadJSON(cb) {
	d3.json("readme-world-110m.json", function(error, world) {
	d3.json("custom-tour.json", function(error, tour) {
	cb(tour, world);
	})
	})
	}

	go();


	var d3_radians = Math.PI / 180;

	function d3_geo_greatArcInterpolator() {
	var x0, y0, cy0, sy0, kx0, ky0,
	x1, y1, cy1, sy1, kx1, ky1,
	d,
	k;

	function interpolate(t) {
	var B = Math.sin(t = d) k,
	A = Math.sin(d - t) * k,
	x = A * kx0 + B * kx1,
	y = A * ky0 + B * ky1,
	z = A * sy0 + B * sy1;
	return [
	Math.atan2(y, x) / d3_radians,
	Math.atan2(z, Math.sqrt(x * x + y * y)) / d3_radians
	];
	}

	interpolate.distance = function() {
	if (d == null) k = 1 / Math.sin(d = Math.acos(Math.max(-1, Math.min(1, sy0 * sy1 + cy0 * cy1 * Math.cos(x1 - x0)))));
	return d;
	};

	interpolate.source = function(_) {
	var cx0 = Math.cos(x0 = _[0] * d3_radians),
	sx0 = Math.sin(x0);
	cy0 = Math.cos(y0 = _[1] * d3_radians);
	sy0 = Math.sin(y0);
	kx0 = cy0 * cx0;
	ky0 = cy0 * sx0;
	d = null;
	return interpolate;
	};

	interpolate.target = function(_) {
	var cx1 = Math.cos(x1 = _[0] * d3_radians),
	sx1 = Math.sin(x1);
	cy1 = Math.cos(y1 = _[1] * d3_radians);
	sy1 = Math.sin(y1);
	kx1 = cy1 * cx1;
	ky1 = cy1 * sx1;
	d = null;
	return interpolate;
	};

	return interpolate;
	}

	</script>