This uses cardinal distortion to explore the United States. Suggested by Panos Ipeirotis.
Created
July 2, 2012 16:06
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Cardinal distortion
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| (function() { | |
| d3.fisheye = { | |
| scale: function(scaleType) { | |
| return d3_fisheye_scale(scaleType(), 3, 0); | |
| }, | |
| circular: function() { | |
| var radius = 200, | |
| distortion = 2, | |
| k0, | |
| k1, | |
| focus = [0, 0]; | |
| function fisheye(d) { | |
| var dx = d.x - focus[0], | |
| dy = d.y - focus[1], | |
| dd = Math.sqrt(dx * dx + dy * dy); | |
| if (!dd || dd >= radius) return {x: d.x, y: d.y, z: 1}; | |
| var k = k0 * (1 - Math.exp(-dd * k1)) / dd * .75 + .25; | |
| return {x: focus[0] + dx * k, y: focus[1] + dy * k, z: Math.min(k, 10)}; | |
| } | |
| function rescale() { | |
| k0 = Math.exp(distortion); | |
| k0 = k0 / (k0 - 1) * radius; | |
| k1 = distortion / radius; | |
| return fisheye; | |
| } | |
| fisheye.radius = function(_) { | |
| if (!arguments.length) return radius; | |
| radius = +_; | |
| return rescale(); | |
| }; | |
| fisheye.distortion = function(_) { | |
| if (!arguments.length) return distortion; | |
| distortion = +_; | |
| return rescale(); | |
| }; | |
| fisheye.focus = function(_) { | |
| if (!arguments.length) return focus; | |
| focus = _; | |
| return fisheye; | |
| }; | |
| return rescale(); | |
| } | |
| }; | |
| function d3_fisheye_scale(scale, d, a) { | |
| function fisheye(_) { | |
| var x = scale(_), | |
| left = x < a, | |
| v, | |
| range = d3.extent(scale.range()), | |
| min = range[0], | |
| max = range[1], | |
| m = left ? a - min : max - a; | |
| if (m == 0) m = max - min; | |
| return (left ? -1 : 1) * m * (d + 1) / (d + (m / Math.abs(x - a))) + a; | |
| } | |
| fisheye.distortion = function(_) { | |
| if (!arguments.length) return d; | |
| d = +_; | |
| return fisheye; | |
| }; | |
| fisheye.focus = function(_) { | |
| if (!arguments.length) return a; | |
| a = +_; | |
| return fisheye; | |
| }; | |
| fisheye.copy = function() { | |
| return d3_fisheye_scale(scale.copy(), d, a); | |
| }; | |
| fisheye.nice = scale.nice; | |
| fisheye.ticks = scale.ticks; | |
| fisheye.tickFormat = scale.tickFormat; | |
| return d3.rebind(fisheye, scale, "domain", "range"); | |
| } | |
| })(); |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <script src="http://d3js.org/d3.v2.min.js"></script> | |
| <script src="fisheye.js"></script> | |
| <script src="http://underscorejs.org/underscore-min.js"></script> | |
| <style> | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| #states { | |
| fill: #aaa; | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| } | |
| #states path:hover { | |
| stroke: white; | |
| } | |
| </style> | |
| <body> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| var width = 960, | |
| height = 500, | |
| centered; | |
| var projection = d3.geo.mercator() | |
| .scale(width) | |
| .translate([0, 0]); | |
| 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); | |
| var states = svg.append("g") | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")") | |
| .append("g") | |
| .attr("id", "states"); | |
| d3.json("world-countries.json", function(json) { | |
| states.selectAll("path") | |
| .data(json.features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .each(function(d,i){ | |
| d.org = d.geometry.coordinates; | |
| }); | |
| }); | |
| svg | |
| .on("mousemove", refish) | |
| .on("mousein", refish) | |
| .on("mouseout", refish); | |
| var xFisheye = d3.fisheye.scale(d3.scale.identity) | |
| .domain([-width/2,width/2]).focus(10); | |
| var yFisheye = d3.fisheye.scale(d3.scale.identity) | |
| .domain([-height/2,height/2]).focus(10); | |
| function fishPolygon(polygon){ | |
| return _.map(polygon, function(list){ | |
| return _.map(list, function(tuple){ | |
| var p = projection(tuple); | |
| var c = [xFisheye(p[0]),yFisheye(p[1])]; | |
| return projection.invert(c); | |
| }); }); | |
| } | |
| function refish(d) { | |
| var m = d3.mouse(this); | |
| m = [m[0]-width/2,m[1]-height/2]; | |
| xFisheye.focus(m[0]); | |
| yFisheye.focus(m[1]); | |
| states.selectAll("path") | |
| .attr("d", function(d){ | |
| var clone = _.extend({},d); | |
| var type = clone.geometry.type; | |
| var processed = null; | |
| if (type === "Polygon") | |
| processed = fishPolygon(d.org); | |
| else | |
| processed = _.map(d.org, fishPolygon); | |
| clone.geometry.coordinates = processed; | |
| return path(clone); | |
| }); | |
| } |
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