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# Demo Floating Axis

Axis within rectangular frame

The following code demonstrates how to put a floating polar curve within a rectangular box. In order to get a better sense of polar curves, please look at demo_curvelinear_grid.py.

    import numpy as np
    import matplotlib.pyplot as plt
    import mpl_toolkits.axisartist.angle_helper as angle_helper
    from matplotlib.projections import PolarAxes
    from matplotlib.transforms import Affine2D
    from mpl_toolkits.axisartist import SubplotHost
    from mpl_toolkits.axisartist import GridHelperCurveLinear

    def curvelinear_test2(fig):
        """
        polar projection, but in a rectangular box.
        """
        global ax1
        # see demo_curvelinear_grid.py for details
        tr = Affine2D().scale(np.pi / 180., 1.) + PolarAxes.PolarTransform()

        extreme_finder = angle_helper.ExtremeFinderCycle(20,
                                                         20,
                                                         lon_cycle=360,
                                                         lat_cycle=None,
                                                         lon_minmax=None,
                                                         lat_minmax=(0,
                                                                     np.inf),
                                                         )

        grid_locator1 = angle_helper.LocatorDMS(12)

        tick_formatter1 = angle_helper.FormatterDMS()

        grid_helper = GridHelperCurveLinear(tr,
                                            extreme_finder=extreme_finder,
                                            grid_locator1=grid_locator1,
                                            tick_formatter1=tick_formatter1
                                            )

        ax1 = SubplotHost(fig, 1, 1, 1, grid_helper=grid_helper)

        fig.add_subplot(ax1)

        # Now creates floating axis

        # floating axis whose first coordinate (theta) is fixed at 60
        ax1.axis["lat"] = axis = ax1.new_floating_axis(0, 60)
        axis.label.set_text(r"$\theta = 60^{\circ}$")
        axis.label.set_visible(True)

        # floating axis whose second coordinate (r) is fixed at 6
        ax1.axis["lon"] = axis = ax1.new_floating_axis(1, 6)
        axis.label.set_text(r"$r = 6$")

        ax1.set_aspect(1.)
        ax1.set_xlim(-5, 12)
        ax1.set_ylim(-5, 10)

        ax1.grid(True)

    fig = plt.figure(1, figsize=(5, 5))
    fig.clf()

    curvelinear_test2(fig)

    plt.show()

Total running time of the script: ( 0 minutes 0.046 seconds)

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