{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# axis_direction demo\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import matplotlib.pyplot as plt\nimport numpy as np\n\nfrom matplotlib.projections import PolarAxes\nfrom matplotlib.transforms import Affine2D\nimport mpl_toolkits.axisartist as axisartist\nimport mpl_toolkits.axisartist.angle_helper as angle_helper\nimport mpl_toolkits.axisartist.grid_finder as grid_finder\nfrom mpl_toolkits.axisartist.grid_helper_curvelinear import \\\n    GridHelperCurveLinear\n\n\ndef setup_axes(fig, rect):\n    \"\"\"Polar projection, but in a rectangular box.\"\"\"\n    # see demo_curvelinear_grid.py for details\n    grid_helper = GridHelperCurveLinear(\n        (\n            Affine2D().scale(np.pi/180., 1.) +\n            PolarAxes.PolarTransform(apply_theta_transforms=False)\n        ),\n        extreme_finder=angle_helper.ExtremeFinderCycle(\n            20, 20,\n            lon_cycle=360, lat_cycle=None,\n            lon_minmax=None, lat_minmax=(0, np.inf),\n        ),\n        grid_locator1=angle_helper.LocatorDMS(12),\n        grid_locator2=grid_finder.MaxNLocator(5),\n        tick_formatter1=angle_helper.FormatterDMS(),\n    )\n    ax = fig.add_subplot(\n        rect, axes_class=axisartist.Axes, grid_helper=grid_helper,\n        aspect=1, xlim=(-5, 12), ylim=(-5, 10))\n    ax.axis[:].toggle(ticklabels=False)\n    ax.grid(color=\".9\")\n    return ax\n\n\ndef add_floating_axis1(ax):\n    ax.axis[\"lat\"] = axis = ax.new_floating_axis(0, 30)\n    axis.label.set_text(r\"$\\theta = 30^{\\circ}$\")\n    axis.label.set_visible(True)\n    return axis\n\n\ndef add_floating_axis2(ax):\n    ax.axis[\"lon\"] = axis = ax.new_floating_axis(1, 6)\n    axis.label.set_text(r\"$r = 6$\")\n    axis.label.set_visible(True)\n    return axis\n\n\nfig = plt.figure(figsize=(8, 4), layout=\"constrained\")\n\nfor i, d in enumerate([\"bottom\", \"left\", \"top\", \"right\"]):\n    ax = setup_axes(fig, rect=241+i)\n    axis = add_floating_axis1(ax)\n    axis.set_axis_direction(d)\n    ax.set(title=d)\n\nfor i, d in enumerate([\"bottom\", \"left\", \"top\", \"right\"]):\n    ax = setup_axes(fig, rect=245+i)\n    axis = add_floating_axis2(ax)\n    axis.set_axis_direction(d)\n    ax.set(title=d)\n\nplt.show()"
      ]
    }
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