keerlu/README.md

## README.md

      
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              README.md
            
          
    This is a Mercator projection world map where you can click to recentre the projection about any point. More details in a blog post here (general background in full post).
Live version hosted here.

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

<style>

	path {
	  stroke: white;
	  stroke-width: 0.25px;
	  fill: gray;
	}

	.cursor {
	  fill: red;
	  pointer-events: none;
	}

</style>

<body>

<script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>

<script>

	var width = 1000,
	    height = 500;

	var projection = d3.geo.mercator()

	var svg = d3.select("body").append("svg")
		.attr("width", width)
		.attr("height", height)
		.on("mousemove", mousemove)
		.on("click", clicked); // set SVG window

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

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

	d3.json("world-110m2.json", function(error, topology) {
		g.selectAll("path")
		.data(topojson.feature(topology, topology.objects.countries)
		.features)
		.enter()
		.append("path")
		.attr("d", path);
	});

	var cursor = svg.append("circle")
		.attr("r", 3)
		.attr("class", "cursor");

	function mousemove() {
	  cursor.attr("transform", "translate(" + d3.mouse(this) + ")");
	}

	function clicked(d) {

		var newcentre = d3.mouse(this)

		projection.rotate([- projection.invert(newcentre)[0], - projection.invert(newcentre)[1]]);

	  	// Transition to the new projection

	 	g.selectAll("path")
		.transition()
	      	.duration(0)
	      	.attr("d", path);

		var translate = projection.translate();

		// Add point showing new projection centre

		svg.append("circle")
		.attr("r", 5)
		.attr("class", "cursor")
		.attr("transform", "translate(" + translate + ")");
	}

</script>

</body>
</html>

## world-110m2.json

      
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              world-110m2.json
            
          
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	<!DOCTYPE html>
	<meta charset="utf-8">

	<style>

	path {
	stroke: white;
	stroke-width: 0.25px;
	fill: gray;
	}

	.cursor {
	fill: red;
	pointer-events: none;
	}

	</style>

	<body>

	<script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>
	<script src="http://d3js.org/topojson.v1.min.js"></script>

	<script>

	var width = 1000,
	height = 500;

	var projection = d3.geo.mercator()

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height)
	.on("mousemove", mousemove)
	.on("click", clicked); // set SVG window

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

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

	d3.json("world-110m2.json", function(error, topology) {
	g.selectAll("path")
	.data(topojson.feature(topology, topology.objects.countries)
	.features)
	.enter()
	.append("path")
	.attr("d", path);
	});

	var cursor = svg.append("circle")
	.attr("r", 3)
	.attr("class", "cursor");

	function mousemove() {
	cursor.attr("transform", "translate(" + d3.mouse(this) + ")");
	}

	function clicked(d) {

	var newcentre = d3.mouse(this)

	projection.rotate([- projection.invert(newcentre)[0], - projection.invert(newcentre)[1]]);

	// Transition to the new projection

	g.selectAll("path")
	.transition()
	.duration(0)
	.attr("d", path);

	var translate = projection.translate();

	// Add point showing new projection centre

	svg.append("circle")
	.attr("r", 5)
	.attr("class", "cursor")
	.attr("transform", "translate(" + translate + ")");
	}

	</script>

	</body>
	</html>