I have the following code:

from mpl_toolkits.axes_grid.axislines import SubplotZero
from matplotlib.transforms import BlendedGenericTransform
import matplotlib.pyplot as plt
import numpy

if 1:
    fig = plt.figure(1)
    ax = SubplotZero(fig, 111)
    fig.add_subplot(ax)

    ax.axhline(linewidth=1.7, color="black")
    ax.axvline(linewidth=1.7, color="black")

    plt.xticks([1])
    plt.yticks([])

    ax.text(0, 1.05, 'y', transform=BlendedGenericTransform(ax.transData, ax.transAxes), ha='center')
    ax.text(1.05, 0, 'x', transform=BlendedGenericTransform(ax.transAxes, ax.transData), va='center')

    for direction in ["xzero", "yzero"]:
        ax.axis[direction].set_axisline_style("-|>")
        ax.axis[direction].set_visible(True)

    for direction in ["left", "right", "bottom", "top"]:
        ax.axis[direction].set_visible(False)

    x = numpy.linspace(-0.5, 1., 1000)
    ax.plot(x, numpy.sin(x*numpy.pi), linewidth=1.2, color="black")

    plt.show()

which produces the following image:

graph

The axis arrowheads look vestigial in comparison to the actual graph. How do I size them up a little so that they look normal with respect to the width of the axes.

Also - it is difficult to see here, but the interior of the arrows is blue - how do I change that to black?

python matplotlib
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