generate_circle.ipynb

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 "metadata": {
  "name": ""
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import numpy as np\n",
      "import math"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def polar_to_cartesian(a, r):\n",
      "    a = math.radians(a)\n",
      "    return (np.cos(a) * r, np.sin(a) * r)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 2
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def write_circle(f, nb_cut, size_cut, radius, offset):\n",
      "    arc_list = []\n",
      "    inter = 360. / nb_cut\n",
      "    for i_cut in range(nb_cut):\n",
      "        arc_list.append((offset + inter * i_cut + size_cut, offset + inter * (i_cut + 1)))\n",
      "    for arc in arc_list:\n",
      "        start = polar_to_cartesian(arc[0], radius)\n",
      "        end = polar_to_cartesian(arc[1], radius)\n",
      "        f.write('M{0},{1} m {2},{3} a{4},{4} -40 0,1 {5},{6} '.format(size[0] / 2, size[1]/2, start[0], start[1], radius,\n",
      "                                                                      end[0] - start[0], end[1] - start[1]))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 3
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "nb_cut = 7\n",
      "size_cut = 0.5\n",
      "radius = 60\n",
      "start_radius = 70.\n",
      "max_radius = 230.\n",
      "nb_circles = 300\n",
      "size = (500, 500)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 17
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "with open(\"tmp.svg\", \"w\") as f:\n",
      "    f.write('<svg xmlns=\"http://www.w3.org/2000/svg\" height=\"{}\" width=\"{}\">'.format(size[0], size[1]))\n",
      "    f.write('<path d=\"')\n",
      "    for i in range(nb_circles):\n",
      "        write_circle(f, 16, 5, start_radius + (max_radius - start_radius) / nb_circles * i, (i % 2) * 360. / 32 )\n",
      "    f.write('\" fill=\"none\" stroke=\"red\" stroke-width=\"0.1\"/>')\n",
      "    f.write('</svg>')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 18
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}