.. _axes_grid-demo_floating_axis:

axes_grid example code: demo_floating_axis.py
=============================================



.. plot:: /home/tcaswell/source/p/matplotlib/doc/mpl_examples/axes_grid/demo_floating_axis.py

::

    """
    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()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)