"""
==================
Demo Parasite Axes
==================

"""
from mpl_toolkits.axisartist.parasite_axes import HostAxes, ParasiteAxes
import matplotlib.pyplot as plt

if __name__ == "__main__":
    fig = plt.figure(1)

    host = HostAxes(fig, [0.15, 0.1, 0.65, 0.8])
    par1 = ParasiteAxes(host, sharex=host)
    par2 = ParasiteAxes(host, sharex=host)
    host.parasites.append(par1)
    host.parasites.append(par2)

    host.set_ylabel("Density")
    host.set_xlabel("Distance")

    host.axis["right"].set_visible(False)
    par1.axis["right"].set_visible(True)
    par1.set_ylabel("Temperature")

    par1.axis["right"].major_ticklabels.set_visible(True)
    par1.axis["right"].label.set_visible(True)

    par2.set_ylabel("Velocity")
    offset = (60, 0)
    new_axisline = par2._grid_helper.new_fixed_axis
    par2.axis["right2"] = new_axisline(loc="right",
                                       axes=par2,
                                       offset=offset)

    fig.add_axes(host)

    host.set_xlim(0, 2)
    host.set_ylim(0, 2)

    host.set_xlabel("Distance")
    host.set_ylabel("Density")
    par1.set_ylabel("Temperature")

    p1, = host.plot([0, 1, 2], [0, 1, 2], label="Density")
    p2, = par1.plot([0, 1, 2], [0, 3, 2], label="Temperature")
    p3, = par2.plot([0, 1, 2], [50, 30, 15], label="Velocity")

    par1.set_ylim(0, 4)
    par2.set_ylim(1, 65)

    host.legend()

    host.axis["left"].label.set_color(p1.get_color())
    par1.axis["right"].label.set_color(p2.get_color())
    par2.axis["right2"].label.set_color(p3.get_color())

    plt.show()
