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forked from tomshanley's block: Force with links
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November 21, 2018 00:29
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Force with links
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;top:0;right:0;bottom:0;left:0; } | |
| path { stroke: black; stroke-width: 1px } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var nodes = [ | |
| { "type": "country", "name": "A", "value": 15 }, | |
| { "type": "country", "name": "B", "value": 5 }, | |
| { "type": "country", "name": "C", "value": 25 }, | |
| { "type": "club", "name": "D", "value": 50 }, | |
| { "type": "club", "name": "E", "value": 10 } | |
| ] | |
| var links = [ | |
| { "source": "A", "target": "D", "value": 1 }, | |
| { "source": "A", "target": "E", "value": 15 }, | |
| { "source": "B", "target": "D", "value": 5 }, | |
| { "source": "B", "target": "E", "value": 50 }, | |
| { "source": "C", "target": "D", "value": 15 }, | |
| ] | |
| let maxRValue = d3.max(nodes, (d) => d.value) | |
| let maxLinkValue = d3.max(links, (d) => d.value) | |
| var w = 800, h = 800, r = 350 | |
| const radians = 0.0174532925 | |
| let linkScale = d3.scaleLinear() | |
| .domain([0, maxLinkValue]) | |
| .range([0, r]) | |
| let rScale = d3.scaleSqrt() | |
| .domain([0, maxRValue]) | |
| .range([10, 75]) | |
| var numberOfCountries = 3 | |
| //fix the circles to the radius | |
| nodes.forEach(function(node, i){ | |
| if (node.type == "country") { | |
| let a = (360/numberOfCountries) * i | |
| node.fx = w/2 + x(a, r) | |
| node.fy = h/2 + y(a, r) | |
| } | |
| }) | |
| var g = d3.select("body").append("svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| .append("g") | |
| g.append("circle") | |
| .attr("cx", w/2) | |
| .attr("cy", h/2) | |
| .attr("r", r) | |
| .style("fill", "none") | |
| .style("stroke", "grey") | |
| var simulation = d3.forceSimulation() | |
| .force("link", d3.forceLink().id(function(d) { return d.name; })) | |
| var link = g.append("g") | |
| .attr("class", "links") | |
| .selectAll("path") | |
| .data(links) | |
| .enter() | |
| .append("path"); | |
| var node = g.append("g") | |
| .attr("class", "nodes") | |
| .selectAll("circle") | |
| .data(nodes) | |
| .enter() | |
| .append("g") | |
| node.append("circle") | |
| .attr("r", (d) => rScale(d.value)) | |
| .style("fill", function(d){ | |
| return d.type == "country" ? "PaleVioletRed" : "MediumSeaGreen" | |
| }) | |
| .style("stroke", "white") | |
| .style("stroke-width", 3) | |
| node.append("text") | |
| .text((d) => d.name) | |
| .style("text-anchor", "middle") | |
| .attr("dy", "0.35em") | |
| .style("stroke", "white") | |
| .style("stroke-width", 3) | |
| node.append("text") | |
| .text((d) => d.name) | |
| .style("text-anchor", "middle") | |
| .attr("dy", "0.35em") | |
| simulation | |
| .nodes(nodes) | |
| .on("tick", ticked) | |
| simulation.force("link") | |
| .links(links) | |
| .distance((d) => linkScale(d.value)) | |
| .strength(0.5) | |
| function ticked() { | |
| link.attr("d", function(d) { | |
| return "M" + d.source.x + " " + d.source.y | |
| + " L" + d.target.x + " " + d.target.y; | |
| }) | |
| node.attr("transform", function(d) { | |
| return "translate(" + d.x + "," + d.y + ")" | |
| }) | |
| } | |
| function x (angle, radius) { | |
| // rotate 90 | |
| let a = 90 - angle | |
| return radius * Math.sin(a * radians) | |
| } | |
| function y (angle, radius) { | |
| // rotate 90 | |
| let a = 90 - angle | |
| return radius * Math.cos(a * radians) | |
| } | |
| </script> | |
| </body> |
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