cpietsch/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Easy example on how to put marker on a d3.js map.
You got 2 options:

using d3.geo.path() which does all the work for you
using svg circles and translating them via projection(d.geometry.coordinates)


## index.html

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

.graticule {
  fill: none;
  stroke: #777;
  stroke-opacity: .5;
  stroke-width: .5px;
}

.land {
  fill: #222;
}

.boundary {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}

circle {
  fill: yellow;
}

.geopath {
  fill: green;
}

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>

var width = 1200,
    height = 720;

var projection = d3.geo.mercator()
    .scale(8000)
    .precision(.1)
    .center([13.320255,52.52831499])
    .translate([width / 2, height / 2])

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

var graticule = d3.geo.graticule();

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

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

d3.json("world-50m.json", function(error, world) {
  svg.insert("path", ".graticule")
      .datum(topojson.feature(world, world.objects.land))
      .attr("class", "land")
      .attr("d", path);

  svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "boundary")
      .attr("d", path);
});

d3.json("stops_berlin.geojson", function(error, data) {

  // using d3.geo.path() which does all the work for you
  svg.append("path")
    .datum(data)
    .classed("geopath", true)
    .attr("d", path)

  // or insert your own custom dots by hand
  svg.append("g")
    .selectAll("g")
    .data(data.features)
    .enter()
      .append("g")
      .attr("transform", function(d) { return "translate(" + projection(d.geometry.coordinates) + ")"; })
      .append("circle")
      .attr("r", 1)

});

d3.select(self.frameElement).style("height", height + "px");

</script>

## stops_berlin.geojson

      
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              stops_berlin.geojson
            
          
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## thumbnail.png

      
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              thumbnail.png
            
          
## world-50m.json

      
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              world-50m.json
            
          
            View raw
              (Sorry about that, but we can’t show files that are this big right now.)

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

	.graticule {
	fill: none;
	stroke: #777;
	stroke-opacity: .5;
	stroke-width: .5px;
	}

	.land {
	fill: #222;
	}

	.boundary {
	fill: none;
	stroke: #fff;
	stroke-width: .5px;
	}

	circle {
	fill: yellow;
	}

	.geopath {
	fill: green;
	}

	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="http://d3js.org/topojson.v1.min.js"></script>
	<script>

	var width = 1200,
	height = 720;

	var projection = d3.geo.mercator()
	.scale(8000)
	.precision(.1)
	.center([13.320255,52.52831499])
	.translate([width / 2, height / 2])

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

	var graticule = d3.geo.graticule();

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

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

	d3.json("world-50m.json", function(error, world) {
	svg.insert("path", ".graticule")
	.datum(topojson.feature(world, world.objects.land))
	.attr("class", "land")
	.attr("d", path);

	svg.insert("path", ".graticule")
	.datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
	.attr("class", "boundary")
	.attr("d", path);
	});

	d3.json("stops_berlin.geojson", function(error, data) {

	// using d3.geo.path() which does all the work for you
	svg.append("path")
	.datum(data)
	.classed("geopath", true)
	.attr("d", path)

	// or insert your own custom dots by hand
	svg.append("g")
	.selectAll("g")
	.data(data.features)
	.enter()
	.append("g")
	.attr("transform", function(d) { return "translate(" + projection(d.geometry.coordinates) + ")"; })
	.append("circle")
	.attr("r", 1)

	});

	d3.select(self.frameElement).style("height", height + "px");

	</script>