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leonsas/index.html

Forked from mbostock/.block
Created July 22, 2012 21:19
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Bubble chart
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index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
circle {
stroke: #fff;
}
</style>
<body>
<button onclick="addtonodes()" text="add"/>
<script src="http://mbostock.github.com/d3/d3.js?2.7.4"></script>
<script src="http://mbostock.github.com/d3/d3.geom.js?2.7.4"></script>
<script src="http://mbostock.github.com/d3/d3.layout.js?2.7.4"></script>
<script src="http://d3js.org/d3.v2.js"></script>
<script>
var nodes= [{"statuses_count": 11, "name": "Leon Sasson", "friends_count": 4, "followers_count": 6, "id": 213899968, "screen_name": "leonsass"}, {"statuses_count": 378, "name": "Jonathan Kohn", "friends_count": 63, "followers_count": 13, "id": 88363150, "screen_name": "jkohn16"}, {"statuses_count": 5748, "name": "Rhett Allain", "friends_count": 368, "followers_count": 2540, "id": 14201924, "screen_name": "rjallain"}, {"statuses_count": 1252, "name": "TEDTalks Updates", "friends_count": 71, "followers_count": 1112719, "id": 15492359, "screen_name": "tedtalks"}, {"statuses_count": 69, "name": "physicsforums", "friends_count": 1, "followers_count": 209, "id": 75086184, "screen_name": "physicsforums"}];
var margin = {top: 0, right: 0, bottom: 0, left: 0},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var n = 20,
m = 1,
padding = 6;
nodes = nodes.map(function(obj) {
obj.radius = Math.sqrt(obj.followers_count)/(Math.sqrt(obj.followers_count)*0.01+ 10) + 1;
obj.cx=width/2;
obj.cy=height/2;
return obj;
});
var force = d3.layout.force()
.nodes(nodes)
.size([width, height])
.gravity(0)
.charge(0)
.on("tick", tick)
.start();
var nodes = force.nodes();
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var circle = svg.selectAll("circle")
.data(nodes)
.enter().append("circle")
.attr("r", function(d) { return d.radius; })
.call(force.drag);
circle.append("title").text(function(d){return d.screen_name +": " + d.followers_count;});
function tick(e) {
circle
.each(gravity(.2 * e.alpha))
.each(collide(.5))
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
}
// Move nodes toward cluster focus.
function gravity(alpha) {
return function(d) {
d.y += (d.cy - d.y) * alpha;
d.x += (d.cx - d.x) * alpha;
};
}
// Resolve collisions between nodes.
function collide(alpha) {
var quadtree = d3.geom.quadtree(nodes);
return function(d) {
var r = d.radius + 12 + padding,
nx1 = d.x - r,
nx2 = d.x + r,
ny1 = d.y - r,
ny2 = d.y + r;
quadtree.visit(function(quad, x1, y1, x2, y2) {
if (quad.point && (quad.point !== d)) {
var x = d.x - quad.point.x,
y = d.y - quad.point.y,
l = Math.sqrt(x * x + y * y),
r = d.radius + quad.point.radius + (d.color !== quad.point.color) * padding;
if (l < r) {
l = (l - r) / l * alpha;
d.x -= x *= l;
d.y -= y *= l;
quad.point.x += x;
quad.point.y += y;
}
}
return x1 > nx2
|| x2 < nx1
|| y1 > ny2
|| y2 < ny1;
});
};
}
</script>
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