json d3强制定向图显示文本属性

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   "cells": [
    {
     "cell_type": "code",
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     "input": [
      "%%html\n",
      "<div id=\"d3-example\"></div>\n",
      "<style>\n",
      ".node {stroke: #fff; stroke-width: 1.5px;}\n",
      ".link {stroke: #999; stroke-opacity: .6;}\n",
      "</style>"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<div id=\"d3-example\"></div>\n",
        "<style>\n",
        ".node {stroke: #fff; stroke-width: 1.5px;}\n",
        ".link {stroke: #999; stroke-opacity: .6;}\n",
        "</style>"
       ],
       "metadata": {},
       "output_type": "display_data",
       "text": [
        "<IPython.core.display.HTML at 0x104fa3e50>"
       ]
      }
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      "%%javascript\n",
      "require.config({paths: {d3: \"http://d3js.org/d3.v3.min\"}});\n",
      "require([\"d3\"], function(d3) {\n",
      "    var width = 800,\n",
      "        height = 500;\n",
      "    var indent = 5;\n",
      "    var color = d3.scale.category10();\n",
      "    var force = d3.layout.force()\n",
      "        .charge(-120)\n",
      "        .linkDistance(60)\n",
      "        .size([width, height]);\n",
      "\n",
      "    var svg = d3.select(\"#d3-example\").select(\"svg\")\n",
      "    if (svg.empty()) {\n",
      "        svg = d3.select(\"#d3-example\").append(\"svg\")\n",
      "                    .attr(\"width\", width)\n",
      "                    .attr(\"height\", height);\n",
      "    }\n",
      "        \n",
      "    d3.json(\"miserables.json\", function(error, graph) {\n",
      "        force.nodes(graph.nodes)\n",
      "            .links(graph.links)\n",
      "            .start();\n",
      "\n",
      "        var link = svg.selectAll(\".link\")\n",
      "            .data(graph.links)\n",
      "            .enter().append(\"line\")\n",
      "            .attr(\"class\", \"link\");\n",
      "\n",
      "        var node = svg.selectAll(\".node\")\n",
      "            .data(graph.nodes)\n",
      "            .enter().append(\"circle\")\n",
      "            .attr(\"class\", \"node\")\n",
      "            .attr(\"r\", 5)  \n",
      "            .style(\"fill\", function(d) {\n",
      "                return color(d.group); \n",
      "            })\n",
      "            .call(force.drag);\n",
      "\n",
      "        var txt = svg.selectAll(\".txt\")\n",
      "            .data(graph.nodes)\n",
      "            .enter().append(\"text\")\n",
      "            .attr(\"class\", \"txt\")\n",
      "            .text(function(d){return d.name; })\n",
      "            .call(force.drag);\n",
      "\n",
      "        force.on(\"tick\", function() {\n",
      "            link.attr(\"x1\", function(d) { return d.source.x; })\n",
      "                .attr(\"y1\", function(d) { return d.source.y; })\n",
      "                .attr(\"x2\", function(d) { return d.target.x; })\n",
      "                .attr(\"y2\", function(d) { return d.target.y; });\n",
      "            \n",
      "            node.attr(\"cx\", function(d) { return d.x; })\n",
      "                .attr(\"cy\", function(d) { return d.y; });\n",
      "            \n",
      "            txt.attr(\"x\", function(d) { return d.x + indent; })\n",
      "                .attr(\"y\", function(d) { return d.y; })\n",
      "                .attr(\"font-size\", 8);\n",
      "            \n",
      "        });\n",
      "    });\n",
      "});"
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     "language": "python",
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        "require.config({paths: {d3: \"http://d3js.org/d3.v3.min\"}});\n",
        "require([\"d3\"], function(d3) {\n",
        "    var width = 800,\n",
        "        height = 500;\n",
        "    var indent = 5;\n",
        "    var color = d3.scale.category10();\n",
        "    var force = d3.layout.force()\n",
        "        .charge(-120)\n",
        "        .linkDistance(60)\n",
        "        .size([width, height]);\n",
        "\n",
        "    var svg = d3.select(\"#d3-example\").select(\"svg\")\n",
        "    if (svg.empty()) {\n",
        "        svg = d3.select(\"#d3-example\").append(\"svg\")\n",
        "                    .attr(\"width\", width)\n",
        "                    .attr(\"height\", height);\n",
        "    }\n",
        "        \n",
        "    d3.json(\"miserables.json\", function(error, graph) {\n",
        "        force.nodes(graph.nodes)\n",
        "            .links(graph.links)\n",
        "            .start();\n",
        "\n",
        "        var link = svg.selectAll(\".link\")\n",
        "            .data(graph.links)\n",
        "            .enter().append(\"line\")\n",
        "            .attr(\"class\", \"link\");\n",
        "\n",
        "        var node = svg.selectAll(\".node\")\n",
        "            .data(graph.nodes)\n",
        "            .enter().append(\"circle\")\n",
        "            .attr(\"class\", \"node\")\n",
        "            .attr(\"r\", 5)  \n",
        "            .style(\"fill\", function(d) {\n",
        "                return color(d.group); \n",
        "            })\n",
        "            .call(force.drag);\n",
        "\n",
        "        var txt = svg.selectAll(\".txt\")\n",
        "            .data(graph.nodes)\n",
        "            .enter().append(\"text\")\n",
        "            .attr(\"class\", \"txt\")\n",
        "            .text(function(d){return d.name; })\n",
        "            .call(force.drag);\n",
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        "        force.on(\"tick\", function() {\n",
        "            link.attr(\"x1\", function(d) { return d.source.x; })\n",
        "                .attr(\"y1\", function(d) { return d.source.y; })\n",
        "                .attr(\"x2\", function(d) { return d.target.x; })\n",
        "                .attr(\"y2\", function(d) { return d.target.y; });\n",
        "            \n",
        "            node.attr(\"cx\", function(d) { return d.x; })\n",
        "                .attr(\"cy\", function(d) { return d.y; });\n",
        "            \n",
        "            txt.attr(\"x\", function(d) { return d.x + indent; })\n",
        "                .attr(\"y\", function(d) { return d.y; })\n",
        "                .attr(\"font-size\", 8);\n",
        "            \n",
        "        });\n",
        "    });\n",
        "});"
       ],
       "metadata": {},
       "output_type": "display_data",
       "text": [
        "<IPython.core.display.Javascript at 0x104fa3bd0>"
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     "language": "python",
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{
  "nodes":[
    {"name":"Myriel","group":1},
    {"name":"Napoleon","group":1},
    {"name":"Mlle.Baptistine","group":1},
    {"name":"Mme.Magloire","group":1},
    {"name":"CountessdeLo","group":1},
    {"name":"Geborand","group":1},
    {"name":"Champtercier","group":1},
    {"name":"Cravatte","group":1},
    {"name":"Count","group":1},
    {"name":"OldMan","group":1},
    {"name":"Labarre","group":2},
    {"name":"Valjean","group":2},
    {"name":"Marguerite","group":3},
    {"name":"Mme.deR","group":2},
    {"name":"Isabeau","group":2},
    {"name":"Gervais","group":2},
    {"name":"Tholomyes","group":3},
    {"name":"Listolier","group":3},
    {"name":"Fameuil","group":3},
    {"name":"Blacheville","group":3},
    {"name":"Favourite","group":3},
    {"name":"Dahlia","group":3},
    {"name":"Zephine","group":3},
    {"name":"Fantine","group":3},
    {"name":"Mme.Thenardier","group":4},
    {"name":"Thenardier","group":4},
    {"name":"Cosette","group":5},
    {"name":"Javert","group":4},
    {"name":"Fauchelevent","group":0},
    {"name":"Bamatabois","group":2},
    {"name":"Perpetue","group":3},
    {"name":"Simplice","group":2},
    {"name":"Scaufflaire","group":2},
    {"name":"Woman1","group":2},
    {"name":"Judge","group":2},
    {"name":"Champmathieu","group":2},
    {"name":"Brevet","group":2},
    {"name":"Chenildieu","group":2},
    {"name":"Cochepaille","group":2},
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    {"name":"Eponine","group":4},
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    {"name":"Woman2","group":5},
    {"name":"MotherInnocent","group":0},
    {"name":"Gribier","group":0},
    {"name":"Jondrette","group":7},
    {"name":"Mme.Burgon","group":7},
    {"name":"Gavroche","group":8},
    {"name":"Gillenormand","group":5},
    {"name":"Magnon","group":5},
    {"name":"Mlle.Gillenormand","group":5},
    {"name":"Mme.Pontmercy","group":5},
    {"name":"Mlle.Vaubois","group":5},
    {"name":"Lt.Gillenormand","group":5},
    {"name":"Marius","group":8},
    {"name":"BaronessT","group":5},
    {"name":"Mabeuf","group":8},
    {"name":"Enjolras","group":8},
    {"name":"Combeferre","group":8},
    {"name":"Prouvaire","group":8},
    {"name":"Feuilly","group":8},
    {"name":"Courfeyrac","group":8},
    {"name":"Bahorel","group":8},
    {"name":"Bossuet","group":8},
    {"name":"Joly","group":8},
    {"name":"Grantaire","group":8},
    {"name":"MotherPlutarch","group":9},
    {"name":"Gueulemer","group":4},
    {"name":"Babet","group":4},
    {"name":"Claquesous","group":4},
    {"name":"Montparnasse","group":4},
    {"name":"Toussaint","group":5},
    {"name":"Child1","group":10},
    {"name":"Child2","group":10},
    {"name":"Brujon","group":4},
    {"name":"Mme.Hucheloup","group":8}
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}

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