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test_tripcolor (Issue #26864) plots with datetime on x-axis only , y-axis only, and both x- and y-axis #27491

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test_tripcolor (Issue #26864) plots with datetime on x-axis only , y-axis only, and both x- and y-axis #27491

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35 changes: 32 additions & 3 deletions lib/matplotlib/tests/test_datetime.py
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Original file line number Diff line number Diff line change
Expand Up @@ -735,11 +735,40 @@ def test_tricontourf(self):
fig, ax = plt.subplots()
ax.tricontourf(...)

@pytest.mark.xfail(reason="Test for tripcolor not written yet")
@mpl.style.context("default")
def test_tripcolor(self):
fig, ax = plt.subplots()
ax.tripcolor(...)
mpl.rcParams["date.converter"] = 'concise'
plt.style.use('_mpl-gallery-nogrid')
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Suggested change
plt.style.use('_mpl-gallery-nogrid')

The gallery-style is not used for tests (and is already set by @mpl.style.context("default")).


fig, (ax, ax1, ax2) = plt.subplots(3, 1, figsize=(6, 4))
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Suggested change
fig, (ax, ax1, ax2) = plt.subplots(3, 1, figsize=(6, 4))
fig, (ax, ax1, ax2) = plt.subplots(3, 1, figsize=(6, 4), layout='constrained')

dates = np.arange(np.datetime64('2022-01-01'), np.datetime64('2023-12-31'),
np.timedelta64(1, 'D'))
n = 256
np.random.seed(19680801)
xz = np.random.uniform(-3, 3, n)
yz = np.random.uniform(-3, 3, n)
zz = (1 - xz / 2 + xz ** 5 + yz ** 3) * np.exp(-xz ** 2 - yz ** 2)

# Randomly sample n dates for x-axis and different y values than above
x_rand_dates = np.random.choice(dates, n, replace=False)
y = np.random.uniform(-3, 3, n)

# Randomly sample n dates for the y-axis and different x values than above
x = np.random.uniform(-3, 3, n)
y_rand_dates = np.random.choice(dates, n, replace=False)

# plot:
ax.plot(x_rand_dates, y, 'o', markersize=2, color='grey')
ax.tripcolor(x_rand_dates, y, zz)
ax1.plot(x, y_rand_dates, 'o', markersize=2, color='grey')
ax1.tripcolor(x, y_rand_dates, zz)
ax2.plot(x_rand_dates, y_rand_dates, 'o', markersize=2, color='grey')
ax2.tripcolor(x_rand_dates, y_rand_dates, zz)
ax.set(xlim=(min(x_rand_dates), max(x_rand_dates)), ylim=(min(y), max(y)))
ax1.set(xlim=(min(x), max(x)), ylim=(min(y_rand_dates), max(y_rand_dates)))
ax2.set(xlim=(min(x_rand_dates), max(x_rand_dates)), ylim=(min(y_rand_dates),
max(y_rand_dates)))
fig.tight_layout()
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Suggested change
fig.tight_layout()


@pytest.mark.xfail(reason="Test for triplot not written yet")
@mpl.style.context("default")
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