| license: mit |
Part of a series of examples. See:
More recently, see the Zoom to Bounding Box example.
forked from mbostock's block: click-to-zoom via transform
forked from nguyenbq's block: click-to-zoom via transform
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: blue; | |
| pointer-events: all; | |
| } | |
| #states { | |
| fill: #aaa; | |
| } | |
| .active{ | |
| fill: orange; | |
| } | |
| .hover{ | |
| fill: orange; | |
| } | |
| #state-borders { | |
| fill: none; | |
| stroke: #e50000; | |
| stroke-width: 2px; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| pointer-events: none; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 900, | |
| centered; | |
| var projection = d3.geo.albersUsa() | |
| .scale(1070) | |
| .translate([width / 2, 300]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| 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) | |
| .on("click", clicked); | |
| var g = svg.append("g"); | |
| d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json", function(error, us) { | |
| if (error) throw error; | |
| g.append("g") | |
| .attr("id", "states") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.states).features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .on("click", clicked); | |
| g.append("path") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
| .attr("id", "state-borders") | |
| .attr("d", path); | |
| }); | |
| function clicked(d) { | |
| var x, y, k; | |
| if (d && centered !== d) { | |
| var centroid = path.centroid(d); | |
| x = centroid[0]; | |
| y = centroid[1]; | |
| k = 5.5; | |
| centered = d; | |
| } else { | |
| x = width / 2; | |
| y = height / 2; | |
| k = 1; | |
| centered = null; | |
| } | |
| g.selectAll("path") | |
| .classed("active", centered && function(d) { return d === centered; }); | |
| g.transition() | |
| .duration(750) | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")scale(" + k + ")translate(" + -x + "," + -y + ")") | |
| .style("stroke-width", 1.5 / k + "px"); | |
| } | |
| </script> |