import matplotlib
import matplotlib.pyplot as plt
import matplotlib.axes as maxes

class Axes(maxes.Axes):
    """
    A hackish way to simultaneously draw texts w/ usetex=True and
    usetex=False in the same figure. It does not work in the ps backend.
    """
    def __init__(self, *kl, **kw):
        self.usetex = kw.pop("usetex", "False")
        self.preview = kw.pop("preview", "False")

        maxes.Axes.__init__(self, *kl, **kw)

    def draw(self, renderer):
        usetex = plt.rcParams["text.usetex"]
        preview = plt.rcParams["text.latex.preview"]
        plt.rcParams["text.usetex"] = self.usetex
        plt.rcParams["text.latex.preview"] = self.preview

        maxes.Axes.draw(self, renderer)

        plt.rcParams["text.usetex"] = usetex
        plt.rcParams["text.latex.preview"] = preview

Subplot = maxes.subplot_class_factory(Axes)


def test_window_extent(ax, usetex, preview):

    va = "baseline"
    ax.xaxis.set_visible(False)
    ax.yaxis.set_visible(False)


    #t = ax.text(0., 0., r"mlp", va="baseline", size=150)
    text_kw = dict(va=va,
                   size=50,
                   bbox=dict(pad=0., ec="k", fc="none"))


    test_strings = ["lg", r"$\frac{1}{2}\pi$",
                    r"$p^{3^A}$", r"$p_{3_2}$"]

    ax.axvline(0, color="r")

    for i, s in enumerate(test_strings):

        ax.axhline(i, color="r")
        ax.text(0., 3-i, s, **text_kw)

    ax.set_xlim(-0.1,1.1)
    ax.set_ylim(-.8,3.9)


    ax.set_title("usetex=%s\npreview=%s" % (str(usetex), str(preview)))



F = plt.figure(figsize=(2.*3,6.5))

for i, usetex, preview in [[0, False, False],
                           [1, True, False],
                           [2, True, True]]:
    ax = Subplot(F, 1, 3, i+1, usetex=usetex, preview=preview)
    F.add_subplot(ax)
    F.subplots_adjust(top=0.85)

    test_window_extent(ax, usetex=usetex, preview=preview)


plt.draw()
plt.show()