Tearing this down to try and understand it a bit better. Removing clicks, links and the cursor. Also attempting to upgrade to d3v4
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Build Your Own Graph!
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| rect { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| .node { | |
| fill: #000; | |
| } | |
| .cursor { | |
| fill: none; | |
| stroke: magenta; | |
| pointer-events: none; | |
| } | |
| .link { | |
| stroke: #999; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var fill = d3.scale.category20(); | |
| var force = d3.layout.force() | |
| .size([width, height]) | |
| .nodes([{}]) // initialize with a single node | |
| .linkDistance(30) | |
| .charge(-60) | |
| .on("tick", tick); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousemove", mousemove) | |
| .on("mousedown", mousedown); | |
| svg.append("rect") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var nodes = force.nodes(), | |
| links = force.links(), | |
| node = svg.selectAll(".node"), | |
| link = svg.selectAll(".link"); | |
| var cursor = svg.append("circle") | |
| .attr("r", 30) | |
| .attr("transform", "translate(-100,-100)") | |
| .attr("class", "cursor"); | |
| restart(); | |
| function mousemove() { | |
| cursor.attr("transform", "translate(" + d3.mouse(this) + ")"); | |
| } | |
| function mousedown() { | |
| var point = d3.mouse(this), | |
| node = {x: point[0], y: point[1]}, | |
| n = nodes.push(node); | |
| // add links to any nearby nodes | |
| nodes.forEach(function(target) { | |
| var x = target.x - node.x, | |
| y = target.y - node.y; | |
| if (Math.sqrt(x * x + y * y) < 30) { | |
| links.push({source: node, target: target}); | |
| } | |
| }); | |
| restart(); | |
| } | |
| function tick() { | |
| link.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; }); | |
| node.attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }); | |
| } | |
| function restart() { | |
| link = link.data(links); | |
| link.enter().insert("line", ".node") | |
| .attr("class", "link"); | |
| node = node.data(nodes); | |
| node.enter().insert("circle", ".cursor") | |
| .attr("class", "node") | |
| .attr("r", 15) | |
| .call(force.drag); | |
| force.start(); | |
| } | |
| </script> |
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