{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# Manual Contour\n\nExample of displaying your own contour lines and polygons using ContourSet.\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import matplotlib.pyplot as plt\n\nfrom matplotlib.contour import ContourSet\nfrom matplotlib.path import Path"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Contour lines for each level are a list/tuple of polygons.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "lines0 = [[[0, 0], [0, 4]]]\nlines1 = [[[2, 0], [1, 2], [1, 3]]]\nlines2 = [[[3, 0], [3, 2]], [[3, 3], [3, 4]]]  # Note two lines."
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Filled contours between two levels are also a list/tuple of polygons.\nPoints can be ordered clockwise or anticlockwise.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "filled01 = [[[0, 0], [0, 4], [1, 3], [1, 2], [2, 0]]]\nfilled12 = [[[2, 0], [3, 0], [3, 2], [1, 3], [1, 2]],   # Note two polygons.\n            [[1, 4], [3, 4], [3, 3]]]"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "fig, ax = plt.subplots()\n\n# Filled contours using filled=True.\ncs = ContourSet(ax, [0, 1, 2], [filled01, filled12], filled=True, cmap=\"bone\")\ncbar = fig.colorbar(cs)\n\n# Contour lines (non-filled).\nlines = ContourSet(\n    ax, [0, 1, 2], [lines0, lines1, lines2], cmap=\"cool\", linewidths=3)\ncbar.add_lines(lines)\n\nax.set(xlim=(-0.5, 3.5), ylim=(-0.5, 4.5),\n       title='User-specified contours')"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Multiple filled contour lines can be specified in a single list of polygon\nvertices along with a list of vertex kinds (code types) as described in the\nPath class.  This is particularly useful for polygons with holes.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "fig, ax = plt.subplots()\nfilled01 = [[[0, 0], [3, 0], [3, 3], [0, 3], [1, 1], [1, 2], [2, 2], [2, 1]]]\nM = Path.MOVETO\nL = Path.LINETO\nkinds01 = [[M, L, L, L, M, L, L, L]]\ncs = ContourSet(ax, [0, 1], [filled01], [kinds01], filled=True)\ncbar = fig.colorbar(cs)\n\nax.set(xlim=(-0.5, 3.5), ylim=(-0.5, 3.5),\n       title='User specified filled contours with holes')\n\nplt.show()"
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
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    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.14.6"
    }
  },
  "nbformat": 4,
  "nbformat_minor": 0
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