riccardoscalco/README.md

## README.md

      
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              README.md
            
          
    Topojson of Italy

Shapefile source: http://www.istat.it/it/archivio/24613
Convert shapefile to geojson, s_srs defines the input projection, t_srs defines the output projection to the EPSG code 4326 (http://spatialreference.org/ref/epsg/4326/)
see also http://www.gdal.org/ogr2ogr.html
ogr2ogr -f GeoJSON -s_srs prov2011_g.prj -t_srs EPSG:4326 sub.json prov2011_g.shp

Converts geojson to topojson
(see https://github.com/mbostock/topojson/wiki/Command-Line-Reference)
topojson -p nome_pro=NOME_PRO -p nome_pro --id-property NOME_PRO -s 0.00000001 -o itx.json sub.json

Beautify the topojson file (not for the web)
js-beautify -f it.json -o it_beauty.json


## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.map {fill: #666; stroke: #f5f5f5;}
.border_map {stroke: red; stroke-width: 3px;}
.torino_map {fill: #fff; stroke: blue; stroke-width: 3px;}
</style>
<html>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>
var width = 500,
    height = 500;

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

d3.json("itx.json", function(error, it) {

    var projection = d3.geo.albers()
        .center([0, 41])
        .rotate([347, 0])
        .parallels([35, 45])
        .scale(2000)
        .translate([width / 2, height / 2]);

    var subunits = topojson.feature(it, it.objects.sub);

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


    // draw border with sea
    svg.append("path")
    .datum(topojson.mesh(it, it.objects.sub, function(a, b) { return a === b ; }))
    .attr("class", "border_map")
    .attr("d", path);

    // draw all the features together (no different styles)
    svg.append("path")
    .datum(subunits)
    .attr("class", "map")
    .attr("d", path);

    // draw and style any feature at time
    /*svg.selectAll("path")
    .data(topojson.feature(it, it.objects.sub).features)
    .enter().append("path")
    .attr("class",function(d) { return d.id; })
    .attr("d",path);*/

    // draw TORINO border (i.e. the border of a given feature)
    svg.append("path")
    .datum(topojson.mesh(it, it.objects.sub, function(a, b) { return b.id === 'TORINO' || a.id === 'TORINO'; }))
    .attr("class", "torino_map")
    .attr("d", path);


});

</script>
</body>
</html>

## itx.json

      
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	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>
	.map {fill: #666; stroke: #f5f5f5;}
	.border_map {stroke: red; stroke-width: 3px;}
	.torino_map {fill: #fff; stroke: blue; stroke-width: 3px;}
	</style>
	<html>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="http://d3js.org/topojson.v1.min.js"></script>
	<script>
	var width = 500,
	height = 500;

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

	d3.json("itx.json", function(error, it) {

	var projection = d3.geo.albers()
	.center([0, 41])
	.rotate([347, 0])
	.parallels([35, 45])
	.scale(2000)
	.translate([width / 2, height / 2]);

	var subunits = topojson.feature(it, it.objects.sub);

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


	// draw border with sea
	svg.append("path")
	.datum(topojson.mesh(it, it.objects.sub, function(a, b) { return a === b ; }))
	.attr("class", "border_map")
	.attr("d", path);

	// draw all the features together (no different styles)
	svg.append("path")
	.datum(subunits)
	.attr("class", "map")
	.attr("d", path);

	// draw and style any feature at time
	/*svg.selectAll("path")
	.data(topojson.feature(it, it.objects.sub).features)
	.enter().append("path")
	.attr("class",function(d) { return d.id; })
	.attr("d",path);*/

	// draw TORINO border (i.e. the border of a given feature)
	svg.append("path")
	.datum(topojson.mesh(it, it.objects.sub, function(a, b) { return b.id === 'TORINO' \|\| a.id === 'TORINO'; }))
	.attr("class", "torino_map")
	.attr("d", path);


	});

	</script>
	</body>
	</html>