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1 <!DOCTYPE html> |
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2 <html> |
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3 <head> |
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4 <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> |
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5 <title>Node-Link Tree</title> |
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6 <script type="text/javascript" src="../../d3.js"></script> |
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7 <script type="text/javascript" src="../../d3.layout.js"></script> |
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8 <style type="text/css"> |
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9 |
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10 .node { |
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11 stroke: #fff; |
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12 stroke-width: 2px; |
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13 } |
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14 |
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15 .link { |
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16 fill: none; |
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17 stroke: #000; |
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18 } |
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19 |
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20 </style> |
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21 </head> |
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22 <body> |
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23 <script type="text/javascript"> |
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24 |
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25 var w = 960, |
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26 h = 500, |
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27 root = {}, |
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28 data = [root], |
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29 tree = d3.layout.tree().size([w - 20, h - 20]), |
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30 diagonal = d3.svg.diagonal(), |
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31 duration = 750, |
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32 timer = setInterval(update, duration); |
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33 |
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34 var vis = d3.select("body").append("svg:svg") |
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35 .attr("width", w) |
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36 .attr("height", h) |
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37 .append("svg:g") |
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38 .attr("transform", "translate(10, 10)"); |
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39 |
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40 vis.selectAll("circle") |
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41 .data(tree(root)) |
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42 .enter().append("svg:circle") |
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43 .attr("class", "node") |
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44 .attr("r", 3.5) |
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45 .attr("cx", x) |
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46 .attr("cy", y); |
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47 |
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48 function update() { |
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49 if (data.length >= 500) return clearInterval(timer); |
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50 |
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51 // Add a new datum to a random parent. |
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52 var d = {id: data.length}, parent = data[~~(Math.random() * data.length)]; |
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53 if (parent.children) parent.children.push(d); else parent.children = [d]; |
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54 data.push(d); |
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55 |
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56 // Compute the new tree layout. We'll stash the old layout in the data. |
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57 var nodes = tree.nodes(root); |
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58 |
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59 // Update the nodes… |
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60 var node = vis.selectAll("circle.node") |
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61 .data(nodes, function(d) { return d.id; }); |
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62 |
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63 // Enter any new nodes at the parent's previous position. |
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64 node.enter().append("svg:circle") |
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65 .attr("class", "node") |
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66 .attr("r", 3.5) |
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67 .attr("cx", function(d) { return d.parent.x0; }) |
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68 .attr("cy", function(d) { return d.parent.y0; }) |
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69 .transition() |
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70 .duration(duration) |
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71 .attr("cx", x) |
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72 .attr("cy", y); |
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73 |
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74 // Transition nodes to their new position. |
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75 node.transition() |
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76 .duration(duration) |
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77 .attr("cx", x) |
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78 .attr("cy", y); |
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79 |
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80 // Update the links… |
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81 var link = vis.selectAll("path.link") |
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82 .data(tree.links(nodes), function(d) { return d.target.id; }); |
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83 |
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84 // Enter any new links at the parent's previous position. |
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85 link.enter().insert("svg:path", "circle") |
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86 .attr("class", "link") |
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87 .attr("d", function(d) { |
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88 var o = {x: d.source.x0, y: d.source.y0}; |
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89 return diagonal({source: o, target: o}); |
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90 }) |
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91 .transition() |
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92 .duration(duration) |
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93 .attr("d", diagonal); |
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94 |
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95 // Transition links to their new position. |
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96 link.transition() |
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97 .duration(duration) |
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98 .attr("d", diagonal); |
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99 } |
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100 |
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101 function x(d) { |
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102 return d.x0 = d.x; |
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103 } |
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104 |
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105 function y(d) { |
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106 return d.y0 = d.y; |
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107 } |
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108 |
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109 </script> |
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110 </body> |
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111 </html> |