Indented tree layout demo.
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December 16, 2015 17:08
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Indented tree layout
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| Country | Continent | |
|---|---|---|
| Argentina | South America | |
| Bangladesh | Asia | |
| Botswana | Africa | |
| Bulgaria | Europe | |
| Canada | North America | |
| Chile | South America | |
| China | Asia | |
| Ethiopia | Africa | |
| France | Europe | |
| Germany | Europe | |
| Ghana | Africa | |
| India | Asia | |
| Japan | Asia | |
| Kenya | Africa | |
| Mexico | South America | |
| Mozambique | Africa | |
| Poland | Europe | |
| Senegal | Africa | |
| Spain | Europe | |
| Sri Lanka | Asia | |
| Sweden | Europe | |
| Thailand | Asia | |
| Turkey | Asia | |
| United Kingdom | Europe | |
| United States | North America | |
| Viet Nam | Asia |
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| (function() { | |
| d3.layout.indent = function() { | |
| var hierarchy = d3.layout.hierarchy(), | |
| separation = d3_layout_indentSeparation, | |
| nodeSize = [1, 1]; | |
| function position(node, previousNode) { | |
| var children = node.children; | |
| node.y = previousNode ? previousNode.y + nodeSize[1] * separation(node, previousNode) : 0; | |
| node.x = node.depth * nodeSize[0]; | |
| if (children && (n = children.length)) { | |
| var i = -1, | |
| n; | |
| while (++i < n) { | |
| node = position(children[i], node); | |
| } | |
| } | |
| return node; | |
| } | |
| function indent(d, i) { | |
| var nodes = hierarchy.call(this, d, i); | |
| position(nodes[0]); | |
| return nodes; | |
| } | |
| indent.nodeSize = function(value) { | |
| if (!arguments.length) return nodeSize; | |
| nodeSize = value; | |
| return indent; | |
| }; | |
| indent.separation = function(value) { | |
| if (!arguments.length) return separation; | |
| separation = value; | |
| return indent; | |
| }; | |
| return d3_layout_hierarchyRebind(indent, hierarchy); | |
| }; | |
| function d3_layout_indentSeparation() { | |
| return 1; | |
| } | |
| // A method assignment helper for hierarchy subclasses. | |
| function d3_layout_hierarchyRebind(object, hierarchy) { | |
| d3.rebind(object, hierarchy, "sort", "children", "value"); | |
| // Add an alias for nodes and links, for convenience. | |
| object.nodes = object; | |
| object.links = d3_layout_hierarchyLinks; | |
| return object; | |
| } | |
| // Returns an array source+target objects for the specified nodes. | |
| function d3_layout_hierarchyLinks(nodes) { | |
| return d3.merge(nodes.map(function(parent) { | |
| return (parent.children || []).map(function(child) { | |
| return {source: parent, target: child}; | |
| }); | |
| })); | |
| } | |
| })(); |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font-family: Helvetica; | |
| font-size: 10px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="d3.layout.indent.js"></script> | |
| <script> | |
| function id(d) { return d.Country ? d.Country : d.key; }; | |
| var width = 960, | |
| height = 500; | |
| var layout = d3.layout.indent() | |
| .sort(function(a, b) { return d3.ascending(id(a), id(b)) }) | |
| .children(function(d) { return d.values; }) | |
| .nodeSize([10, 15]) | |
| .separation(function(node, previousNode) { return node.parent === previousNode.parent || node.parent === previousNode ? 1 : 2; }); | |
| var nestAlpha = d3.nest() | |
| .key(function(d) { return d.Country.slice(0,1); }); | |
| var nestContinent = d3.nest() | |
| .key(function(d) { return d.Continent; }); | |
| d3.csv("countries.csv", function(error, countries) { | |
| var svg = d3.select("body").append("svg") | |
| .attr({ | |
| width: width, | |
| height: height | |
| }) | |
| .append("g") | |
| .attr("transform", "translate(10,10)"); | |
| var continents = { | |
| key: "Countries", | |
| values: nestContinent.entries(countries) | |
| }; | |
| var alphabet = { | |
| key: "Countries", | |
| values: nestAlpha.entries(countries) | |
| }; | |
| var countries = { | |
| key: "Countries", | |
| values: countries | |
| } | |
| function update(tree) { | |
| var nodes = layout(tree); | |
| labels = svg.selectAll(".label") | |
| .data(nodes, function(d) { return d.Country + d.key }); | |
| labels.enter() | |
| .append("text") | |
| .attr({ | |
| "class": "label", | |
| dy: ".35em", | |
| transform: function(d) { return "translate(" + (d.x - 200) + "," + d.y + ")"; } | |
| }) | |
| .style("font-weight", function(d) { return d.Country ? null : "bold" }) | |
| .text(function(d) { return id(d); }); | |
| labels.transition().delay(250).duration(1000) | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }); | |
| labels.exit().transition() | |
| .attr("transform", function(d) { return "translate(" + (d.x - 200) + "," + d.y + ")"; }) | |
| .remove() | |
| } | |
| function init() { | |
| update(countries); | |
| setTimeout(function() { update(continents) }, 3000); | |
| setTimeout(function() { update(alphabet) }, 6000); | |
| setTimeout(init, 9000); | |
| } | |
| init(); | |
| }); | |
| </script> |
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