{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from matplotlib import pyplot\n",
    "%matplotlib inline\n",
    "\n",
    "from shapely.geometry import Polygon, Point\n",
    "from descartes.patch import PolygonPatch"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "\n",
    "\n",
    "GRAY='#999999'\n",
    "BLUE='#222299'\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "\n",
    "fig = pyplot.figure(1, figsize=(12,20), dpi=90)\n",
    "\n",
    "a = Point(1, 1).buffer(1.5)\n",
    "b = Point(2, 1).buffer(1.5)\n",
    "\n",
    "# 1\n",
    "ax = fig.add_subplot(121)\n",
    "\n",
    "patch1 = PolygonPatch(a, fc=GRAY, ec=GRAY, alpha=0.2, zorder=1)\n",
    "ax.add_patch(patch1)\n",
    "patch2 = PolygonPatch(b, fc=GRAY, ec=GRAY, alpha=0.2, zorder=1)\n",
    "ax.add_patch(patch2)\n",
    "c = a.intersection(b)\n",
    "patchc = PolygonPatch(c, fc=BLUE, ec=BLUE, alpha=0.5, zorder=2)\n",
    "ax.add_patch(patchc)\n",
    "\n",
    "ax.set_title('a.intersection(b)')\n",
    "\n",
    "xrange = [-1, 4]\n",
    "yrange = [-1, 3]\n",
    "ax.set_xlim(*xrange)\n",
    "ax.set_xticks([-1, 0, 1, 2, 3])\n",
    "ax.set_ylim(*yrange)\n",
    "ax.set_yticks([-1, 0, 1, 2, 3])\n",
    "ax.set_aspect(1)\n",
    "\n",
    "#2\n",
    "ax = fig.add_subplot(122)\n",
    "\n",
    "patch1 = PolygonPatch(a, fc=GRAY, ec=GRAY, alpha=0.2, zorder=1)\n",
    "ax.add_patch(patch1)\n",
    "patch2 = PolygonPatch(b, fc=GRAY, ec=GRAY, alpha=0.2, zorder=1)\n",
    "ax.add_patch(patch2)\n",
    "c = a.symmetric_difference(b)\n",
    "\n",
    "if c.geom_type == 'Polygon':\n",
    "    patchc = PolygonPatch(c, fc=BLUE, ec=BLUE, alpha=0.5, zorder=2)\n",
    "    ax.add_patch(patchc)\n",
    "elif c.geom_type == 'MultiPolygon':\n",
    "    for p in c:\n",
    "        patchp = PolygonPatch(p, fc=BLUE, ec=BLUE, alpha=0.5, zorder=2)\n",
    "        ax.add_patch(patchp)\n",
    "\n",
    "ax.set_title('a.symmetric_difference(b)')\n",
    "\n",
    "xrange = [-1, 4]\n",
    "yrange = [-1, 3]\n",
    "ax.set_xlim(*xrange)\n",
    "ax.set_xticks([-1, 0, 1, 2, 3])\n",
    "ax.set_ylim(*yrange)\n",
    "ax.set_yticks([-1, 0, 1, 2, 3])\n",
    "ax.set_aspect(1)\n",
    "\n",
    "pyplot.show()\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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