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Interactive map of the 16 federal states of Germany
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<!DOCTYPE html>
<meta charset="utf-8">
<script src="http://d3js.org/d3.v3.min.js"></script>
<style>
.background {
fill: none;
/*fill: rgb(239, 237, 245);*/
stroke: black;
stroke-width: 3.5px;
pointer-events: all;
}
#states {
fill: rgb(188, 189, 220);
stroke: #fff;
stroke-width: 1.25px;
opacity: 0.85;
}
#states .active {
/*fill: lightblue;*/
fill: rgb(117, 107, 177);
}
.graticuleLine {
fill: none;
stroke: #777;
stroke-width: 0.5px;
}
</style>
</body>
<script>
var width = 960,
height = 500,
focused = null,
geoPath;
var svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
svg.append("rect")
.attr("class", "background")
.attr("width", width)
.attr("height", height);
var g = svg.append("g")
.append("g")
.attr("id", "states");
d3.json("./dataBundesLander.json", function(collection) {
var bounds = d3.geo.bounds(collection),
bottomLeft = bounds[0],
topRight = bounds[1],
rotLong = -(topRight[0]+bottomLeft[0])/2;
center = [(topRight[0]+bottomLeft[0])/2+rotLong, (topRight[1]+bottomLeft[1])/2],
//default scale projection
projection = d3.geo.albers()
.parallels([bottomLeft[1],topRight[1]])
.rotate([rotLong,0,0])
.translate([width/2,height/2])
.center(center),
bottomLeftPx = projection(bottomLeft),
topRightPx = projection(topRight),
scaleFactor = 1.00*Math.min(width/(topRightPx[0]-bottomLeftPx[0]), height/(-topRightPx[1]+bottomLeftPx[1])),
projection = d3.geo.albers()
.parallels([bottomLeft[1],topRight[1]])
.rotate([rotLong,0,0])
.translate([width/2,height/2])
.scale(scaleFactor*0.975*1000)
//.scale(4*1000) //1000 is default for USA map
.center(center);
geoPath = d3.geo.path().projection(projection);
var graticule = d3.geo.graticule()
.step([1, 1]);
g.append("path")
.datum(graticule)
.attr("class", "graticuleLine")
.attr("d", geoPath);
g.selectAll("path.feature")
.data(collection.features)
.enter()
.append("path")
.attr("class", "feature")
.attr("d", geoPath)
.on("click", clickPath);
console.log("d3.json: bounds = "+bounds);
console.log("d3.json: bottomLeft = "+bottomLeft);
console.log("d3.json: topRight = "+topRight);
console.log("d3.json: center = "+center);
console.log("d3.json: projection(center) = "+projection(center));
console.log("d3.json: projection(bottomLeft) = "+projection(bottomLeft));
console.log("d3.json: projection(topRight) = "+projection(topRight));
console.log("d3.json: topRightPx = "+topRightPx);
console.log("d3.json: bottomLeftPx = "+bottomLeftPx);
console.log("d3.json: scaleFactor x axis = "+width/(topRightPx[0]-bottomLeftPx[0]));
console.log("d3.json: scaleFactor y axis = "+height/(-topRightPx[1]+bottomLeftPx[1]));
console.log("d3.json: scaleFactor = "+scaleFactor);
});
function clickPath(d) {
var x = width/2,
y = height/2,
k = 1,
name = d.properties.NAME_1;
g.selectAll("text")
.remove();
if ((focused === null) || !(focused === d)) {
var centroid = geoPath.centroid(d),
x = +centroid[0],
y = +centroid[1],
k = 1.75;
focused = d;
g.append("text")
.text(name)
.attr("x", x)
.attr("y", y)
.style("text-anchor","middle")
.style("font-size","8px")
.style("stroke-width","0px")
.style("fill","black")
.style("font-family","Times New Roman")
.on("click", clickText);
} else {
focused = null;
};
g.selectAll("path")
.classed("active", focused && function(d) { return d === focused; });
g.transition()
.duration(1000)
.attr("transform", "translate("+ (width/2) +","+ (height/2) +")scale("+ k +")translate("+ (-x) +","+ (-y) +")")
.style("stroke-width", 1.75/k +"px");
}
function clickText(d) {
focused = null;
g.selectAll("text")
.remove();
g.selectAll("path")
.classed("active", 0);
g.transition()
.duration(1000)
.attr("transform", "scale("+1+")translate("+0+","+0+")")
.style("stroke-width", 1.00+"px");
}
</script>
</body>
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