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@drzax
Forked from colingourlay/esnextbin.md
Last active March 3, 2016 22:43
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esnextbin sketch
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.node {
stroke-width: 1.5px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="index.js"></script>
var width = 512,
height = 512,
svg,
gA,
gB,
total = 1000,
radius = 1,
limit = total,
gravity = 10,
// charge = 0.01,
nodes,
color,
force;
in
nodes = d3.range(total).map(function() { return {}; });
var reversed = false;
setTimeout(function () {
setInterval(function () {
if (reversed) {
if (limit < total) {
limit++;
} else {
reversed = false;
}
} else {
if (limit > 0) {
limit--;
} else {
reversed = true;
}
}
},10);
setInterval(function () {
force.alpha(0.01); // keep alive
},1000);
}, 3000);
force = d3.layout.force()
.gravity(gravity)
// .charge(function(d, i) { return i < limit ? charge : charge * 3; })
.nodes(nodes)
.size([width, height]);
force.start();
svg = d3.select("body").append("svg")
.attr('viewBox', '0 0 ' + width + ' ' + height);
svg.selectAll("circle")
.data(nodes)
.enter().append("circle")
.attr("r", radius);
force.on("tick", function(e) {
var quadtree = d3.geom.quadtree(nodes),
i = 0,
n = nodes.length;
while (++i < n) quadtree.visit(collide(nodes[i]));
svg.selectAll("circle")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
function collide(node) {
var r = node.radius + 16,
nx1 = node.x - r,
nx2 = node.x + r,
ny1 = node.y - r,
ny2 = node.y + r;
return function(quad, x1, y1, x2, y2) {
if (quad.point && (quad.point !== node)) {
var x = node.x - quad.point.x,
y = node.y - quad.point.y,
l = Math.sqrt(x * x + y * y),
r = node.radius + quad.point.radius;
if (l < r) {
l = (l - r) / l * .5;
node.x -= x *= l;
node.y -= y *= l;
quad.point.x += x;
quad.point.y += y;
}
}
return x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1;
};
}
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