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Added test for tricontour #27545

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Added test for tricontour #27545

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39 changes: 35 additions & 4 deletions lib/matplotlib/tests/test_datetime.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@

import matplotlib.pyplot as plt
import matplotlib as mpl

import matplotlib.tri as tri

class TestDatetimePlotting:
@mpl.style.context("default")
Expand Down Expand Up @@ -805,11 +805,42 @@ def test_text(self):
ax3.plot(x_dates, y_dates)
ax3.text(test_date, test_date, "Inserted Text", **font_properties)

@pytest.mark.xfail(reason="Test for tricontour not written yet")
@mpl.style.context("default")
def test_tricontour(self):
fig, ax = plt.subplots()
ax.tricontour(...)

# make unequailly distributed data points:

dates = np.arange(np.datetime64('2022-01-01'), np.datetime64('2022-12-28'),
np.timedelta64(1,'D'))
n = len(dates)
np.random.seed(19680801)
indx = np.array(np.random.random_sample(n//2)*n, dtype='int')
np.random.seed(100)
indy = np.array(np.random.random_sample(n//2)*n, dtype='int')
x = indx - n/2.
y = indy - n/2.
z = x**2 + y**2 - x/4.
levels = np.linspace(z.min(), z.max(), 5)
dates_x = dates[indx]
dates_y = dates[indy]

# plot:
fig, (ax0, ax1, ax2) = plt.subplots(1,3, figsize=(20, 5))
# dates on y axis
ax0.plot(x, dates_y, 'o', markersize=2, color='lightgrey')
ax0.tricontour(x, dates_y, z, levels=levels)
ax0.tick_params('y',labelrotation=45)
# dates on x axis
ax1.plot(dates_x, y, 'o', markersize=2, color='lightgrey')
ax1.tricontour(dates_x, y, z, levels=levels)
ax1.tick_params('x',labelrotation=45)
# dates on x and y axes
ax2.plot(dates_x, dates_y, 'o', markersize=2, color='lightgrey')
ax2.tricontour(dates_x, dates_y, z, levels=levels)
ax2.tick_params(labelrotation=45)

fig.tight_layout()
plt.show()

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