Dragable force directed graph. Instructions on the dragging mechanism are here.
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March 6, 2017 11:02
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dragable force directed graphs
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .links line { | |
| stroke: #999; | |
| stroke-opacity: 0.6; | |
| } | |
| .nodes circle { | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <svg width="960" height="600"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| //create somewhere to put the force directed graph | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var nodes_data = [ | |
| {"name": "Travis", "sex": "M"}, | |
| {"name": "Rake", "sex": "M"}, | |
| {"name": "Diana", "sex": "F"}, | |
| {"name": "Rachel", "sex": "F"}, | |
| {"name": "Shawn", "sex": "M"}, | |
| {"name": "Emerald", "sex": "F"} | |
| ] | |
| var links_data = [ | |
| {"source": "Travis", "target": "Rake"}, | |
| {"source": "Diana", "target": "Rake"}, | |
| {"source": "Diana", "target": "Rachel"}, | |
| {"source": "Rachel", "target": "Rake"}, | |
| {"source": "Rachel", "target": "Shawn"}, | |
| {"source": "Emerald", "target": "Rachel"} | |
| ] | |
| //set up the simulation | |
| var simulation = d3.forceSimulation() | |
| //add nodes | |
| .nodes(nodes_data); | |
| //add forces | |
| //we're going to add a charge to each node | |
| //also going to add a centering force | |
| //and a link force | |
| var link_force = d3.forceLink(links_data) | |
| .id(function(d) { return d.name; }); | |
| simulation | |
| .force("charge_force", d3.forceManyBody()) | |
| .force("center_force", d3.forceCenter(width / 2, height / 2)) | |
| .force("links",link_force); | |
| //add tick instructions: | |
| simulation.on("tick", tickActions ); | |
| //draw circles for the links | |
| var node = svg.append("g") | |
| .attr("class", "nodes") | |
| .selectAll("circle") | |
| .data(nodes_data) | |
| .enter() | |
| .append("circle") | |
| .attr("r", 10) | |
| .attr("fill", "red"); | |
| //draw lines for the links | |
| var link = svg.append("g") | |
| .attr("class", "links") | |
| .selectAll("line") | |
| .data(links_data) | |
| .enter().append("line") | |
| .attr("stroke-width", 2); | |
| var drag_handler = d3.drag() | |
| .on("start", drag_start) | |
| .on("drag", drag_drag) | |
| .on("end", drag_end); | |
| //same as using .call on the node variable as in https://bl.ocks.org/mbostock/4062045 | |
| drag_handler(node) | |
| //drag handler | |
| //d is the node | |
| function drag_start(d) { | |
| if (!d3.event.active) simulation.alphaTarget(0.3 ).restart(); | |
| d.fx = d.x; | |
| d.fy = d.y; | |
| } | |
| function drag_drag(d) { | |
| d.fx = d3.event.x; | |
| d.fy = d3.event.y; | |
| } | |
| function drag_end(d) { | |
| if (!d3.event.active) simulation.alphaTarget(0); | |
| d.fx = null; | |
| d.fy = null; | |
| } | |
| function tickActions() { | |
| //update circle positions each tick of the simulation | |
| node | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }); | |
| //update link positions | |
| //simply tells one end of the line to follow one node around | |
| //and the other end of the line to follow the other node around | |
| 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; }); | |
| } | |
| </script> |
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