Like many folks, I really liked the classic Obama Budget visualization in the NYT (now sheltered behind the vigilant guard of a paywall, but you can read about it here: https://flowingdata.com/2012/02/15/slicing-obamas-2013-budget-proposal-four-ways/). I wanted to have some bubbles floating about the screen too, so I made this. The hardest part to making it appear dynamic was the subtle hesitation in the movement between groups.
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February 5, 2016 22:02
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Force Layout I
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset='utf-8'> | |
| <title>Force Layout w/ Shift</title> | |
| <style> | |
| .node { | |
| fill: #ccc; | |
| stroke: #333; | |
| stroke-width: 2px; | |
| } | |
| .link { | |
| stroke: #777; | |
| stroke-width: 2px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src='https://d3js.org/d3.v3.min.js'></script> | |
| <input type="radio" name="rorl" value="0">Right<br /> | |
| <input type="radio" name="rorl" value="1">Left<br /> | |
| <input type="radio" name="rorl" value="2" checked>Group<br /> | |
| <script> | |
| var width = 640, | |
| height = 480, | |
| rorl = 2; | |
| /*** start setting up data */ | |
| var nodes = [ //todo: make this node list less static (either by randomly generating, or by pulling from some actual data file) | |
| {"Name":"First", "Value":100, "Group":0}, | |
| {"Name":"Second", "Value":120, "Group":0}, | |
| {"Name":"Third", "Value":40, "Group":0}, | |
| {"Name":"Fourth", "Value":100, "Group":1}, | |
| {"Name":"Fifth", "Value":200, "Group":1}, | |
| {"Name":"Sixth", "Value":300, "Group":1}, | |
| {"Name":"Seventh", "Value":50, "Group":1}, | |
| {"Name":"Eigth", "Value":100, "Group":2}, | |
| {"Name":"Ninth", "Value":150, "Group":2}, | |
| {"Name":"Tenth", "Value":50, "Group":2}, | |
| {"Name":"First", "Value":10, "Group":0}, | |
| {"Name":"Second", "Value":12, "Group":0}, | |
| {"Name":"Third", "Value":40, "Group":0}, | |
| {"Name":"Fourth", "Value":10, "Group":1}, | |
| {"Name":"Fifth", "Value":20, "Group":1}, | |
| {"Name":"Sixth", "Value":30, "Group":1}, | |
| {"Name":"Seventh", "Value":50, "Group":1}, | |
| {"Name":"Eigth", "Value":10, "Group":2}, | |
| {"Name":"Ninth", "Value":15, "Group":2}, | |
| {"Name":"Tenth", "Value":50, "Group":2}, | |
| ]; | |
| var max_amount = d3.max(nodes, function(d) { return parseInt(d.Value); }); | |
| var radius_scale = d3.scale.pow().exponent(0.5).domain([0, max_amount]).range([2, 35]); | |
| nodes.forEach(function(d){ d.radius = radius_scale(parseInt(d.Value)); }); | |
| /*** end setting up data */ | |
| var gravityTargets = [{x:640, y:height/2},{x:0, y:height/2}, //rorl targets | |
| [{x:0, y:height/2},{x:width/2, y:height/2},{x:640, y:height/2}]]; //group targets | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', width) | |
| .attr('height', height) | |
| .attr('fill','#eee'); | |
| svg.append("rect") | |
| .attr("x", 0) | |
| .attr("y", 0) | |
| .attr("height", height) | |
| .attr("width",width) | |
| .style("stroke", '#333') | |
| .style("fill", "none") | |
| .style("stroke-width", 1); | |
| var node = svg.selectAll('.node') | |
| .data(nodes) | |
| .enter().append('circle') | |
| .attr('class', 'node'); | |
| var force = d3.layout.force() | |
| .gravity(0.1) | |
| .charge(-0) | |
| .friction(0.7) | |
| .nodes(nodes) | |
| .size([width, height]); | |
| force.on("tick", function(e) { | |
| var q = d3.geom.quadtree(nodes), | |
| i = 0, | |
| n = nodes.length; | |
| while (++i < n) q.visit(collide(nodes[i])); | |
| var k = 0.15 * e.alpha; | |
| if (rorl == 2) { | |
| nodes.forEach(function (d, i) { | |
| d.y += (gravityTargets[rorl][d.Group].y - d.y) * k; | |
| d.x += (gravityTargets[rorl][d.Group].x - d.x) * k; | |
| force.chargeDistance(75); | |
| }); | |
| } else { | |
| nodes.forEach(function (d, i) { | |
| d.y += (gravityTargets[rorl].y - d.y) * k; | |
| d.x += (gravityTargets[rorl].x - d.x) * k; | |
| force.chargeDistance(9999999999); | |
| }); | |
| } | |
| node | |
| .attr("cx", function(d) {return d.x;}) | |
| .attr("cy", function(d) {return d.y;}) | |
| .attr('r', function(d) { return d.radius; }); | |
| }); | |
| node.call(force.drag); | |
| function collide(n) { | |
| var r = n.radius + 100, | |
| nx1 = n.x - r, | |
| nx2 = n.x + r, | |
| ny1 = n.y - r, | |
| ny2 = n.y + r; | |
| return function(quad, x1, y1, x2, y2) { | |
| if (quad.point && (quad.point !== n)) { | |
| var x = n.x - quad.point.x, | |
| y = n.y - quad.point.y, | |
| l = Math.sqrt(x * x + y * y), | |
| r = n.radius + quad.point.radius; | |
| if (l < r) { | |
| l = (l - r) / r * 0.5; | |
| n.x -= x *= l; | |
| n.y -= y *= l; | |
| quad.point.x += x; | |
| quad.point.y += y; | |
| } | |
| } | |
| return x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1; | |
| }; | |
| } | |
| d3.selectAll("input") | |
| .on("click",function(d) { | |
| if(rorl == this.value) return; | |
| rorl = 2; //initially set to 'group' to shake up the nodes (purely for visual appeal) | |
| var v = this.value; | |
| setTimeout(function(){rorl = v;},100); //then set actual value | |
| force.start(); | |
| }); | |
| force.start(); | |
| </script> | |
| </body> | |
| </html> |
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