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POInteracting forces with D3.js
 

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    <p>I'm trying to 'simulate' gravitational forces on particles as they move towards a 'focal' point. Practically speaking, I am trying to modify the following code so that the particles are pulled slightly off-course by the orange node on their way to the blue node. My problem is that I am having trouble conceptualising this using D3.js force directed layouts. I realise this is a pretty vague question, but any help is greatly appreciated! Image and code are below:</p> <p><img src="https://i.stack.imgur.com/QtAjm.gif" alt="enter image description here"></p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html;charset=utf-8"/&gt; &lt;title&gt;Force Layouts - Quantitative Foci&lt;/title&gt; &lt;script type="text/javascript" src="http://d3js.org/d3.v2.min.js?2.8.1"&gt;&lt;/script&gt; &lt;style type="text/css"&gt; circle { stroke: #fff; } svg { fill: #fff; stroke: #000; } &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="body"&gt; &lt;div id="chart"&gt;&lt;/div&gt; &lt;/div&gt; &lt;script type="text/javascript"&gt; var w = 1280, h = 800, color = d3.scale.category10(); var force = d3.layout.force() .gravity(0) .charge(-5) .linkStrength(0) .size([w, h]); var links = force.links(), nodes = force.nodes(), centers = [ {type: 0, x: 3 * w / 6, y: 2 * h / 6, fixed: true}, {type: 1, x: 4 * w / 6, y: 4 * h / 6, fixed: true} ]; var svg = d3.select("#chart").append("svg:svg") .attr("width", w) .attr("height", h); svg.append("svg:rect") .attr("width", w) .attr("height", h); svg.selectAll("circle") .data(centers) .enter().append("svg:circle") .attr("r", 12) .attr("cx", function(d) { return d.x; }) .attr("cy", function(d) { return d.y; }) .style("fill", fill) .call(force.drag); force.on("tick", function(e) { var k = e.alpha * .1; nodes.forEach(function(node) { var center = centers[node.type]; node.x += (center.x - node.x) * k; node.y += (center.y - node.y) * k; }); svg.selectAll("circle") .attr("cx", function(d) { return d.x; }) .attr("cy", function(d) { return d.y; }); svg.selectAll("line") .attr("x1", function(d) { return d.source.x; }) .attr("y1", function(d) { return d.source.y; }) .attr("x2", function(d) { return d.target.x; }) .attr("y2", function(d) { return d.target.y; }); }); var p0; svg.on("mousemove", function() { var p1 = d3.svg.mouse(this), a = {type: 0, x: p1[0], y: p1[1], px: (p0 || (p0 = p1))[0], py: p0[1]}, b = {type: 1, x: centers[1].x, y: centers[1].y, fixed:true}, link = {source: a, target: b}; p0 = p1; svg.selectAll() .data([a, b]) .enter().append("svg:circle") .attr("cx", function(d) { return d.x; }) .attr("cy", function(d) { return d.y; }) .attr("r", 4.5) .style("fill", fill) .transition() .delay(3000) .attr("r", 1e-6) .remove(); svg.insert("svg:line", "circle") .data([link]) .transition() .delay(3000) .each("end", function() { nodes.splice(nodes.indexOf(a), 1); nodes.splice(nodes.indexOf(b), 1); links.splice(links.indexOf(link), 1); }) .remove(); nodes.push(a, b); links.push(link); force.start(); }); function fill(d) { return color(d.type); } &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><a href="https://i.stack.imgur.com/QtAjm.gif" rel="nofollow noreferrer">1</a> <a href="http://jsfiddle.net/fbW7T/1/" rel="nofollow noreferrer">http://jsfiddle.net/fbW7T/1/</a> -- before.</p> <p>[2] <a href="http://jsfiddle.net/fbW7T/2/" rel="nofollow noreferrer">http://jsfiddle.net/fbW7T/2/</a> -- after, with Lephix' proposal.</p>
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