test_spines.py

import numpy as np

import matplotlib.pyplot as plt
from matplotlib.testing.decorators import check_figures_equal, image_comparison


@image_comparison(['spines_axes_positions'])
def test_spines_axes_positions():
    # SF bug 2852168
    fig = plt.figure()
    x = np.linspace(0, 2*np.pi, 100)
    y = 2*np.sin(x)
    ax = fig.add_subplot(1, 1, 1)
    ax.set_title('centered spines')
    ax.plot(x, y)
    ax.spines['right'].set_position(('axes', 0.1))
    ax.yaxis.set_ticks_position('right')
    ax.spines['top'].set_position(('axes', 0.25))
    ax.xaxis.set_ticks_position('top')
    ax.spines['left'].set_color('none')
    ax.spines['bottom'].set_color('none')


@image_comparison(['spines_data_positions'])
def test_spines_data_positions():
    fig = plt.figure()
    ax = fig.add_subplot(1, 1, 1)
    ax.spines['left'].set_position(('data', -1.5))
    ax.spines['top'].set_position(('data', 0.5))
    ax.spines['right'].set_position(('data', -0.5))
    ax.spines['bottom'].set_position('zero')
    ax.set_xlim([-2, 2])
    ax.set_ylim([-2, 2])


@check_figures_equal(extensions=["png"])
def test_spine_nonlinear_data_positions(fig_test, fig_ref):
    plt.style.use("default")

    ax = fig_test.add_subplot()
    ax.set(xscale="log", xlim=(.1, 1))
    # Use position="data" to visually swap the left and right spines, using
    # linewidth to distinguish them.  The calls to tick_params removes labels
    # (for image comparison purposes) and harmonizes tick positions with the
    # reference).
    ax.spines["left"].set_position(("data", 1))
    ax.spines["left"].set_linewidth(2)
    ax.spines["right"].set_position(("data", .1))
    ax.tick_params(axis="y", labelleft=False, direction="in")

    ax = fig_ref.add_subplot()
    ax.set(xscale="log", xlim=(.1, 1))
    ax.spines["right"].set_linewidth(2)
    ax.tick_params(axis="y", labelleft=False, left=False, right=True)


@image_comparison(['spines_capstyle'])
def test_spines_capstyle():
    # issue 2542
    plt.rc('axes', linewidth=20)
    fig = plt.figure()
    ax = fig.add_subplot(1, 1, 1)
    ax.set_xticks([])
    ax.set_yticks([])


def test_label_without_ticks():
    fig = plt.figure()
    ax = fig.add_subplot(1, 1, 1)
    plt.subplots_adjust(left=0.3, bottom=0.3)
    ax.plot(np.arange(10))
    ax.yaxis.set_ticks_position('left')
    ax.spines['left'].set_position(('outward', 30))
    ax.spines['right'].set_visible(False)
    ax.set_ylabel('y label')
    ax.xaxis.set_ticks_position('bottom')
    ax.spines['bottom'].set_position(('outward', 30))
    ax.spines['top'].set_visible(False)
    ax.set_xlabel('x label')
    ax.xaxis.set_ticks([])
    ax.yaxis.set_ticks([])
    plt.draw()

    spine = ax.spines['left']
    spinebbox = spine.get_transform().transform_path(
        spine.get_path()).get_extents()
    assert ax.yaxis.label.get_position()[0] < spinebbox.xmin, \
        "Y-Axis label not left of the spine"

    spine = ax.spines['bottom']
    spinebbox = spine.get_transform().transform_path(
        spine.get_path()).get_extents()
    assert ax.xaxis.label.get_position()[1] < spinebbox.ymin, \
        "X-Axis label not below the spine"