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Map of german districts
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| <!DOCTYPE html> | |
| <html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| var width = 960; | |
| var height = 500; | |
| var canvas = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| d3.json("germany.json", function(data) { | |
| //jeder gemeinde ein path | |
| var group = canvas.selectAll("g") | |
| .data(data.features) //array in geojson heißt "features" | |
| .enter() | |
| .append("g") | |
| // now: data is bound | |
| //earth not flat --> map on flat surface --> projection notwendig | |
| //standard: mercator | |
| var projection = d3.geo.mercator() | |
| .scale(50000) | |
| .center([13.439235,48.830666]) // centers map at given coordinates | |
| .translate([width / 2, height / 2]); // translate map to svg | |
| //path generator | |
| var path = d3.geo.path().projection(projection); //hand projection to projection generator --> how to translate coordinate to pixels | |
| //append to path to each "g" element | |
| var areas = group.append("path") | |
| .attr("d", path) //data comes from path generator | |
| .attr("class", "area") //CSS | |
| .attr("fill", "steelblue"); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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