This is a simple vertical tree diagram written with d3.js v4.
This is designed to be used as a starting point for further development as part of documenting an update to the book D3 Tips and Tricks to version 4 of d3.js.
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November 30, 2020 07:10
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Simple vertical tree diagram using v4
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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> /* set the CSS */ | |
| .node circle { | |
| fill: #fff; | |
| stroke: steelblue; | |
| stroke-width: 3px; | |
| } | |
| .node text { font: 12px sans-serif; } | |
| .node--internal text { | |
| text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff; | |
| } | |
| .link { | |
| fill: none; | |
| stroke: #ccc; | |
| stroke-width: 2px; | |
| } | |
| </style> | |
| <body> | |
| <!-- load the d3.js library --> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var treeData = | |
| { | |
| "name": "Top Level", | |
| "children": [ | |
| { | |
| "name": "Level 2: A", | |
| "children": [ | |
| { "name": "Son of A" }, | |
| { "name": "Daughter of A" } | |
| ] | |
| }, | |
| { "name": "Level 2: B" } | |
| ] | |
| }; | |
| // set the dimensions and margins of the diagram | |
| var margin = {top: 40, right: 90, bottom: 50, left: 90}, | |
| width = 660 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| // declares a tree layout and assigns the size | |
| var treemap = d3.tree() | |
| .size([width, height]); | |
| // assigns the data to a hierarchy using parent-child relationships | |
| var nodes = d3.hierarchy(treeData); | |
| // maps the node data to the tree layout | |
| nodes = treemap(nodes); | |
| // append the svg obgect to the body of the page | |
| // appends a 'group' element to 'svg' | |
| // moves the 'group' element to the top left margin | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom), | |
| g = svg.append("g") | |
| .attr("transform", | |
| "translate(" + margin.left + "," + margin.top + ")"); | |
| // adds the links between the nodes | |
| var link = g.selectAll(".link") | |
| .data( nodes.descendants().slice(1)) | |
| .enter().append("path") | |
| .attr("class", "link") | |
| .attr("d", function(d) { | |
| return "M" + d.x + "," + d.y | |
| + "C" + d.x + "," + (d.y + d.parent.y) / 2 | |
| + " " + d.parent.x + "," + (d.y + d.parent.y) / 2 | |
| + " " + d.parent.x + "," + d.parent.y; | |
| }); | |
| // adds each node as a group | |
| var node = g.selectAll(".node") | |
| .data(nodes.descendants()) | |
| .enter().append("g") | |
| .attr("class", function(d) { | |
| return "node" + | |
| (d.children ? " node--internal" : " node--leaf"); }) | |
| .attr("transform", function(d) { | |
| return "translate(" + d.x + "," + d.y + ")"; }); | |
| // adds the circle to the node | |
| node.append("circle") | |
| .attr("r", 10); | |
| // adds the text to the node | |
| node.append("text") | |
| .attr("dy", ".35em") | |
| .attr("y", function(d) { return d.children ? -20 : 20; }) | |
| .style("text-anchor", "middle") | |
| .text(function(d) { return d.data.name; }); | |
| </script> | |
| </body> |
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