Using__repr_svg_with_networkx.ipynb

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   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "If you use the excellent [networkx](http://networkx.lanl.gov) package from working with graphs, here's a cool way to use the ``_repr_svg_`` in the IPython Notebook or qtconsole. "
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import networkx as nx\n",
      "import matplotlib.pyplot as plt\n",
      "import StringIO\n",
      "from matplotlib.figure import Figure\n",
      "\n",
      "class MyGraph(nx.Graph):\n",
      "  def _repr_svg_(self):\n",
      "     plt.ioff() # turn off interactive mode\n",
      "     fig=plt.figure(figsize=(2,2))\n",
      "     ax = fig.add_subplot(111)\n",
      "     nx.draw_shell(self, ax=ax)\n",
      "     output = StringIO.StringIO()\n",
      "     fig.savefig(output,format='svg')\n",
      "     plt.ion() # turn on interactive mode\n",
      "     return output.getvalue()\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 2
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Basically, I'm creating a class to use as a *harness* for networkx graphs so that I don't have to keep plotting them to see what changes have been made to the graph as a result of various operations on the graph (e.g. removing nodes, adding edges). For example,here's a binomial graph:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "g=nx.random_graphs.binomial_graph(10,.5)\n",
      "f=MyGraph(g)\n",
      "f\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
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    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Now, if I remove some edges as shown:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "f.remove_nodes_from([0,3,7,5] )\n",
      "f # this triggers the _repr_svg function in the notebook"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
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      }
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     "prompt_number": 4
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Pretty cool, huh? Now, you can interact with networkx graphs and get quick SVG's the represent those changes. Because I've defined a subclass, then I can do everything I normally do with network graphs.\n",
      "\n",
      "I'm sure there's a neater way to do this and I'd love to hear it! You can download this notebook on my github [site](https://github.com/unpingco/Pig-in-the-Python/blob/master/Using__repr_svg_with_networkx.ipynb)."
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Addendum by Min RK in the comments"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Min has come up with a better way to do this [without subclassing](ttp://nbviewer.ipython.org/urls/raw.github.com/minrk/Pig-in-the-Python/master/Using__repr_svg_with_networkx.ipynb). I'm including his work below to keep everything in one place.\n",
      "\n",
      "Let's define a function to render a graph to SVG:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import matplotlib.pyplot as plt\n",
      "from io import BytesIO\n",
      "\n",
      "def graph_to_svg(g):\n",
      "    \"\"\"return the SVG of a matplotlib figure generated from a graph\"\"\"\n",
      "    fig=plt.figure(figsize=(2,2))\n",
      "    ax = fig.add_subplot(111)\n",
      "    nx.draw_shell(g, ax=ax)\n",
      "    output = BytesIO()\n",
      "    fig.savefig(output, format='svg')\n",
      "    plt.close(fig)\n",
      "    return output.getvalue()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 5
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "And call it:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "from IPython.display import display, SVG\n",
      "display(SVG(graph_to_svg(g)))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
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       "text": [
        "<IPython.core.display.SVG at 0x41614b0>"
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     "prompt_number": 6
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Now we can register `graph_to_svg` as the formatter to be called *any time* an `nx.Graph` object is seen:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "formatter = get_ipython().display_formatter.formatters['image/svg+xml']\n",
      "formatter.for_type(nx.Graph, graph_to_svg)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 7
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "From now on, any time we would return a graph, we will see it as an SVG:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "g"
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     "language": "python",
     "metadata": {},
     "outputs": [
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    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Now, if I remove some edges as shown:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "g.remove_nodes_from([0,3,7,5])\n",
      "g # this triggers the graph_to_svg function in the notebook"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
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     ],
     "prompt_number": 9
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Pretty cool, huh? Now, you can interact with networkx graphs and get quick SVG's the represent those changes, without any subclasses.\n",
      "\n",
      "Thanks for the input, Min! This is a much cleaner way to accomplish this rendering."
     ]
    }
   ],
   "metadata": {}
  }
 ]
}