Created
August 21, 2012 10:05
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D3.js Azimuthal, orthographic projection with pretty bubbles
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> | |
| <style type="text/css"> | |
| body { font: 300 13px "Helvetica Neue", Helvetica; } | |
| path { fill: #ccc; stroke: #F60; } | |
| circle { stroke-width:0.5px; vector-effect:non-scaling-stroke } | |
| circle.f { stroke:#ffffff; fill-opacity: 0.8} | |
| circle.m { stroke:#ffffff; fill-opacity: 0.8} | |
| </style> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.5.0"></script> | |
| <script type="text/javascript"> | |
| // Pretty circles ---------> | |
| color = d3.scale.linear() | |
| .domain([12, 30]) | |
| .range(["red", "green"]) | |
| size = d3.scale.linear() | |
| .domain([0, 10]); | |
| // <----- Pretty circles | |
| var countryFeature; | |
| var datacentreFeature; | |
| var projection = d3.geo.azimuthal() | |
| .scale(380) | |
| .origin([-71.03,42.37]) | |
| .mode('orthographic') | |
| .translate([400, 400]); | |
| //640 400 | |
| var circle = d3.geo.greatCircle().origin(projection.origin()); | |
| // TODO fix d3.geo.azimuthal to be consistent with scale | |
| var scale = { orthographic: 380, stereographic: 380, gnomonic: 380, | |
| equidistant: 380 / Math.PI * 2, equalarea: 380 / Math.SQRT2}; | |
| var path = d3.geo.path().projection(projection); | |
| var svg = d3.select("#chart").append('svg:svg') | |
| .attr('width', 800) | |
| .attr('height', 600) | |
| .on('mousedown', mousedown); | |
| var countries = svg.append('g') | |
| .attr('width', 800) | |
| .attr('height', 600) | |
| .attr('id', 'countries'); | |
| var datacentres = svg.append('g') | |
| .attr('width', 800) | |
| .attr('height', 600) | |
| .attr('id', 'datacentres'); | |
| d3.json('world-countries.json', function(collection) { | |
| countryFeature = countries.selectAll('path') | |
| .data(collection.features) | |
| .enter().append('svg:path') | |
| .attr('d', clip); | |
| countryFeature.append("svg:title").text(function(d) { return d.properties.name; }).attr('text-anchor', 'middle'); | |
| }); | |
| d3.json('datacentres.json', function(json) { | |
| datacentreFeature = datacentres.selectAll('g') | |
| .data(json.features) | |
| .enter() | |
| .append('g') | |
| .append('svg:circle') | |
| .attr('class', function(d) { return assignClass(d.properties.kgCO2e); }) | |
| .attr('r', function(d) { return 10; }) | |
| //return size(ballSize(d.properties.kgCO2e)) | |
| .attr("fill", function(d) { return color((10 * Math.exp((1 - d.properties.kgCO2e), 2))); }); | |
| datacentreFeature = datacentres.selectAll('g'); | |
| }); | |
| d3.select(window).on('mousemove', mousemove) | |
| .on('mouseup', mouseup); | |
| d3.select('select').on('change', | |
| function() { | |
| projection.mode(this.value).scale(scale[this.value]); | |
| refresh(750); | |
| }); | |
| var m0, o0; | |
| function mousedown() { | |
| m0 = [d3.event.pageX, d3.event.pageY]; | |
| o0 = projection.origin(); | |
| d3.event.preventDefault(); | |
| } | |
| function mousemove() { | |
| if (m0) { | |
| var m1 = [d3.event.pageX, d3.event.pageY], | |
| o1 = [o0[0] + (m0[0] - m1[0]) / 8, o0[1] + (m1[1] - m0[1]) / 8]; | |
| projection.origin(o1); | |
| circle.origin(o1) | |
| refresh(); | |
| } | |
| } | |
| function mouseup() { | |
| if (m0) { | |
| mousemove(); | |
| m0 = null; | |
| } | |
| } | |
| function refresh(duration) { | |
| (duration ? | |
| countryFeature.transition().duration(duration) | |
| : countryFeature) | |
| .attr('d', clip); | |
| (duration ? | |
| datacentreFeature.transition().duration(duration) | |
| : datacentreFeature) | |
| .attr('transform', function (d) { return "translate(" + clip(d) + ")"; }); | |
| } | |
| function clip(d) { | |
| return path(circle.clip(d)); | |
| } | |
| function ballSize (datum) { | |
| return (datum.kgCO2e > 1) ? 10 : (10 * Math.exp((1 - datum.kgCO2e), 2)); | |
| } | |
| function assignClass (datum) { | |
| return (datum.kgCO2e > 0.2) ? "f" : "m"; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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