Mouseover to repel nodes. Adapted from my talk on force layouts. Compare to the canvas version.
forked from mbostock‘s block: Collision Detection
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<style>
line.link {
pointer-events: none;
}
</style>
<script>
var width = 960,
height = 500;
var circles = d3.range(10).map(function(i) {
return {
radius: Math.random() * 12 + 8,
index: i,
radius: 15,
group: Math.floor((i)/4) % 4
};
})
var nodes = [{index: -1, group: -1, radius: 200 }].concat(circles)
//var circles = nodes.slice(1)
var links = [
{source: circles[0], target: circles[1], type: "bond"},
{source: circles[1], target: circles[2], type: "bond"},
{source: circles[2], target: circles[3], type: "bond"},
{source: circles[3], target: circles[0], type: "bond"},
];
var root = nodes[0];
var color = d3.scale.category10();
root.radius = 0;
root.fixed = true;
var force = d3.layout.force()
.gravity(0.05)
//.charge(function(d, i) { return i ? 0 : -200; })
//.linkStrength(function(l, i) { return l.strength || 0 })
//.linkStrength(0.5)
//.linkDistance(10)
.nodes(nodes)
.size([width, height]);
force.start();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
svg.selectAll("circle")
.data(circles)
.enter().append("circle").classed("node", true)
.attr("r", function(d) { return d.radius; })
.style("fill", function(d, i) { return color(d.group); })
.on("mouseout", splitNode)
.call(force.drag)
function splitNode(d) {
var nodes = force.nodes()
console.log("d", d)
var index = nodes.length;
var jiggle = 5 + Math.random() * 10;
var newNode = {
index: index,
radius: Math.random() * 12 + 8,
group: d.group,
x: d.x + jiggle,
y: d.y + jiggle,
px: d.px + jiggle,
py: d.py + jiggle
}
nodes.push(newNode)
var newLink = {
source: d, target: newNode, type: "bond"
}
links.push(newLink)
svg.append("circle")
.datum(newNode)
.classed("node", true)
.style("fill", function(d, i) { return color(d.group); })
.call(force.drag)
.on("mouseout", splitNode)
svg.append("line")
.datum(newLink)
.classed("link", true)
.attr({
stroke: "#111"
})
}
svg.selectAll("line")
.data(links)
.enter().append("line").classed("link", true)
.attr({
stroke: "#111"
})
force.on("tick", function(e) {
var nodes = force.nodes()
// collision detection
var q = d3.geom.quadtree(nodes);
nodes.forEach(function(node) {
q.visit(collide(node))
})
// strongly coupling certain nodes
links.forEach(function(link) {
var source = link.source;
var target = link.target;
if(link.type == "bond") {
var x = source.x - target.x;
var y = source.y - target.y;
var dist = Math.sqrt(x * x + y * y);
var r = source.radius + target.radius;
if (dist < r) {
dist = (dist - r) / dist * .5; //don't quite understand this
source.x -= x *= dist;
source.y -= y *= dist;
target.x += x;
target.y += y;
} else {
dist = -0.021; // not sure how to do the opposive of above
source.x += x *= dist;
source.y += y *= dist;
target.x -= x;
target.y -= y;
}
}
link.strength = 1;
})
svg.selectAll("circle.node")
.attr({
cx: function(d) {return d.x },
cy: function(d) { return d.y },
r: function(d) { return d.radius }
})
svg.selectAll("line.link")
.attr({
x1: function(d) { return d.source.x },
y1: function(d) { return d.source.y },
x2: function(d) { return d.target.x },
y2: function(d) { return d.target.y },
})
});
svg.on("mousemove", function() {
//var p1 = d3.mouse(this);
//root.px = p1[0];
//root.py = p1[1];
force.resume();
});
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,
dist = Math.sqrt(x * x + y * y),
r = node.radius + quad.point.radius;
if (dist < r) {
dist = (dist - r) / dist * .5;
node.x -= x *= dist;
node.y -= y *= dist;
quad.point.x += x;
quad.point.y += y;
}
}
return x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1;
};
}
</script>