{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n\n# Editing network geometry: Nodes\n\nIn this example, we show how to mode a node in the network and look into\nwhat happens to the links.\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Imports\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "from uuid import uuid4\nfrom tempfile import gettempdir\nfrom os.path import join\nfrom aequilibrae.utils.create_example import create_example\nfrom shapely.geometry import Point\nimport matplotlib.pyplot as plt"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "We create the example project inside our temp folder\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "fldr = join(gettempdir(), uuid4().hex)\n\nproject = create_example(fldr)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Let's move node one from the upper left corner of the image above, a bit to the left and to the bottom\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "# We also add the node we want to move\nall_nodes = project.network.nodes\nlinks = project.network.links\nnode = all_nodes.get(1)\nnew_geo = Point(node.geometry.x + 0.02, node.geometry.y - 0.02)\nnode.geometry = new_geo\n\n# We can save changes for all nodes we have edited so far\nnode.save()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "If you want to show the path in Python\nWe do NOT recommend this, though....  It is very slow for real networks\nWe plot the entire network\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "links.refresh()\ncurr = project.conn.cursor()\ncurr.execute(\"Select link_id from links;\")\n\nfor lid in curr.fetchall():\n    geo = links.get(lid[0]).geometry\n    plt.plot(*geo.xy, color=\"blue\")\n\nplt.plot(*node.geometry.xy, \"o\", color=\"black\")\n\nplt.show()\n\n# Did you notice the links are matching the node?\n# Look at the original network and see how it used to look like"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "project.close()"
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
    },
    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.9.18"
    }
  },
  "nbformat": 4,
  "nbformat_minor": 0
}