from datetime import datetime

import io

import itertools

import platform

import re

from types import SimpleNamespace

import numpy as np

from numpy.testing import assert_array_equal, assert_array_almost_equal

import pytest

import matplotlib as mpl

import matplotlib.pyplot as plt

import matplotlib.collections as mcollections

import matplotlib.colors as mcolors

import matplotlib.path as mpath

import matplotlib.transforms as mtransforms

from matplotlib.collections import (Collection, LineCollection,

EventCollection, PolyCollection)

from matplotlib.collections import FillBetweenPolyCollection

from matplotlib.testing.decorators import check_figures_equal, image_comparison

@pytest.fixture(params=["pcolormesh", "pcolor"])

def pcfunc(request):

return request.param

def generate_EventCollection_plot():

"""Generate the initial collection and plot it."""

positions = np.array([0., 1., 2., 3., 5., 8., 13., 21.])

extra_positions = np.array([34., 55., 89.])

orientation = 'horizontal'

lineoffset = 1

linelength = .5

linewidth = 2

color = [1, 0, 0, 1]

linestyle = 'solid'

antialiased = True

coll = EventCollection(positions,

orientation=orientation,

lineoffset=lineoffset,

linelength=linelength,

linewidth=linewidth,

color=color,

linestyle=linestyle,

antialiased=antialiased

)

fig, ax = plt.subplots()

ax.add_collection(coll)

ax.set_title('EventCollection: default')

props = {'positions': positions,

'extra_positions': extra_positions,

'orientation': orientation,

'lineoffset': lineoffset,

'linelength': linelength,

'linewidth': linewidth,

'color': color,

'linestyle': linestyle,

'antialiased': antialiased

}

ax.set_xlim(-1, 22)

ax.set_ylim(0, 2)

return ax, coll, props

@image_comparison(['EventCollection_plot__default.png'])

def test__EventCollection__get_props():

_, coll, props = generate_EventCollection_plot()

# check that the default segments have the correct coordinates

check_segments(coll,

props['positions'],

props['linelength'],

props['lineoffset'],

props['orientation'])

# check that the default positions match the input positions

np.testing.assert_array_equal(props['positions'], coll.get_positions())

# check that the default orientation matches the input orientation

assert props['orientation'] == coll.get_orientation()

# check that the default orientation matches the input orientation

assert coll.is_horizontal()

# check that the default linelength matches the input linelength

assert props['linelength'] == coll.get_linelength()

# check that the default lineoffset matches the input lineoffset

assert props['lineoffset'] == coll.get_lineoffset()

# check that the default linestyle matches the input linestyle

assert coll.get_linestyle() == [(0, None)]

# check that the default color matches the input color

for color in [coll.get_color(), *coll.get_colors()]:

np.testing.assert_array_equal(color, props['color'])

@image_comparison(['EventCollection_plot__set_positions.png'])

def test__EventCollection__set_positions():

splt, coll, props = generate_EventCollection_plot()

new_positions = np.hstack([props['positions'], props['extra_positions']])

coll.set_positions(new_positions)

np.testing.assert_array_equal(new_positions, coll.get_positions())

check_segments(coll, new_positions,

props['linelength'],

props['lineoffset'],

props['orientation'])

splt.set_title('EventCollection: set_positions')

splt.set_xlim(-1, 90)

@image_comparison(['EventCollection_plot__add_positions.png'])

def test__EventCollection__add_positions():

splt, coll, props = generate_EventCollection_plot()

new_positions = np.hstack([props['positions'],

props['extra_positions'][0]])

coll.switch_orientation() # Test adding in the vertical orientation, too.

coll.add_positions(props['extra_positions'][0])

coll.switch_orientation()

np.testing.assert_array_equal(new_positions, coll.get_positions())

check_segments(coll,

new_positions,

props['linelength'],

props['lineoffset'],

props['orientation'])

splt.set_title('EventCollection: add_positions')

splt.set_xlim(-1, 35)

@image_comparison(['EventCollection_plot__append_positions.png'])

def test__EventCollection__append_positions():

splt, coll, props = generate_EventCollection_plot()

new_positions = np.hstack([props['positions'],

props['extra_positions'][2]])

coll.append_positions(props['extra_positions'][2])

np.testing.assert_array_equal(new_positions, coll.get_positions())

check_segments(coll,

new_positions,

props['linelength'],

props['lineoffset'],

props['orientation'])

splt.set_title('EventCollection: append_positions')

splt.set_xlim(-1, 90)

@image_comparison(['EventCollection_plot__extend_positions.png'])

def test__EventCollection__extend_positions():

splt, coll, props = generate_EventCollection_plot()

new_positions = np.hstack([props['positions'],

props['extra_positions'][1:]])

coll.extend_positions(props['extra_positions'][1:])

np.testing.assert_array_equal(new_positions, coll.get_positions())

check_segments(coll,

new_positions,

props['linelength'],

props['lineoffset'],

props['orientation'])

splt.set_title('EventCollection: extend_positions')

splt.set_xlim(-1, 90)

@image_comparison(['EventCollection_plot__switch_orientation.png'])

def test__EventCollection__switch_orientation():

splt, coll, props = generate_EventCollection_plot()

new_orientation = 'vertical'

coll.switch_orientation()

assert new_orientation == coll.get_orientation()

assert not coll.is_horizontal()

new_positions = coll.get_positions()

check_segments(coll,

new_positions,

props['linelength'],

props['lineoffset'], new_orientation)

splt.set_title('EventCollection: switch_orientation')

splt.set_ylim(-1, 22)

splt.set_xlim(0, 2)

@image_comparison(['EventCollection_plot__switch_orientation__2x.png'])

def test__EventCollection__switch_orientation_2x():

"""

Check that calling switch_orientation twice sets the orientation back to

the default.

"""

splt, coll, props = generate_EventCollection_plot()

coll.switch_orientation()

coll.switch_orientation()

new_positions = coll.get_positions()

assert props['orientation'] == coll.get_orientation()

assert coll.is_horizontal()

np.testing.assert_array_equal(props['positions'], new_positions)

check_segments(coll,

new_positions,

props['linelength'],

props['lineoffset'],

props['orientation'])

splt.set_title('EventCollection: switch_orientation 2x')

@image_comparison(['EventCollection_plot__set_orientation.png'])

def test__EventCollection__set_orientation():

splt, coll, props = generate_EventCollection_plot()

new_orientation = 'vertical'

coll.set_orientation(new_orientation)

assert new_orientation == coll.get_orientation()

assert not coll.is_horizontal()

check_segments(coll,

props['positions'],

props['linelength'],

props['lineoffset'],

new_orientation)

splt.set_title('EventCollection: set_orientation')

splt.set_ylim(-1, 22)

splt.set_xlim(0, 2)

@image_comparison(['EventCollection_plot__set_linelength.png'])

def test__EventCollection__set_linelength():

splt, coll, props = generate_EventCollection_plot()

new_linelength = 15

coll.set_linelength(new_linelength)

assert new_linelength == coll.get_linelength()

check_segments(coll,

props['positions'],

new_linelength,

props['lineoffset'],

props['orientation'])

splt.set_title('EventCollection: set_linelength')

splt.set_ylim(-20, 20)

@image_comparison(['EventCollection_plot__set_lineoffset.png'])

def test__EventCollection__set_lineoffset():

splt, coll, props = generate_EventCollection_plot()

new_lineoffset = -5.

coll.set_lineoffset(new_lineoffset)

assert new_lineoffset == coll.get_lineoffset()

check_segments(coll,

props['positions'],

props['linelength'],

new_lineoffset,

props['orientation'])

splt.set_title('EventCollection: set_lineoffset')

splt.set_ylim(-6, -4)

@image_comparison([

'EventCollection_plot__set_linestyle.png',

'EventCollection_plot__set_linestyle.png',

'EventCollection_plot__set_linewidth.png',

])

def test__EventCollection__set_prop():

for prop, value, expected in [

('linestyle', 'dashed', [(0, (6.0, 6.0))]),

('linestyle', (0, (6., 6.)), [(0, (6.0, 6.0))]),

('linewidth', 5, 5),

]:

splt, coll, _ = generate_EventCollection_plot()

coll.set(**{prop: value})

assert plt.getp(coll, prop) == expected

splt.set_title(f'EventCollection: set_{prop}')

@image_comparison(['EventCollection_plot__set_color.png'])

def test__EventCollection__set_color():

splt, coll, _ = generate_EventCollection_plot()

new_color = np.array([0, 1, 1, 1])

coll.set_color(new_color)

for color in [coll.get_color(), *coll.get_colors()]:

np.testing.assert_array_equal(color, new_color)

splt.set_title('EventCollection: set_color')

def check_segments(coll, positions, linelength, lineoffset, orientation):

"""

Test helper checking that all values in the segment are correct, given a

particular set of inputs.

"""

segments = coll.get_segments()

if (orientation.lower() == 'horizontal'

or orientation.lower() == 'none' or orientation is None):

# if horizontal, the position in is in the y-axis

pos1 = 1

pos2 = 0

elif orientation.lower() == 'vertical':

# if vertical, the position in is in the x-axis

pos1 = 0

pos2 = 1

else:

raise ValueError("orientation must be 'horizontal' or 'vertical'")

# test to make sure each segment is correct

for i, segment in enumerate(segments):

assert segment[0, pos1] == lineoffset + linelength / 2

assert segment[1, pos1] == lineoffset - linelength / 2

assert segment[0, pos2] == positions[i]

assert segment[1, pos2] == positions[i]

def test_collection_norm_autoscale():

# norm should be autoscaled when array is set, not deferred to draw time

lines = np.arange(24).reshape((4, 3, 2))

coll = mcollections.LineCollection(lines, array=np.arange(4))

assert coll.norm(2) == 2 / 3

# setting a new array shouldn't update the already scaled limits

coll.set_array(np.arange(4) + 5)

assert coll.norm(2) == 2 / 3

def test_null_collection_datalim():

col = mcollections.PathCollection([])

col_data_lim = col.get_datalim(mtransforms.IdentityTransform())

assert_array_equal(col_data_lim.get_points(),

mtransforms.Bbox.null().get_points())

def test_no_offsets_datalim():

# A collection with no offsets and a non transData

# transform should return a null bbox

ax = plt.axes()

coll = mcollections.PathCollection([mpath.Path([(0, 0), (1, 0)])])

ax.add_collection(coll)

coll_data_lim = coll.get_datalim(mtransforms.IdentityTransform())

assert_array_equal(coll_data_lim.get_points(),

mtransforms.Bbox.null().get_points())

def test_add_collection():

# Test if data limits are unchanged by adding an empty collection.

# GitHub issue #1490, pull #1497.

plt.figure()

ax = plt.axes()

ax.scatter([0, 1], [0, 1])

bounds = ax.dataLim.bounds

ax.scatter([], [])

assert ax.dataLim.bounds == bounds

@mpl.style.context('mpl20')

@check_figures_equal()

def test_collection_log_datalim(fig_test, fig_ref):

# Data limits should respect the minimum x/y when using log scale.

x_vals = [4.38462e-6, 5.54929e-6, 7.02332e-6, 8.88889e-6, 1.12500e-5,

1.42383e-5, 1.80203e-5, 2.28070e-5, 2.88651e-5, 3.65324e-5,

4.62363e-5, 5.85178e-5, 7.40616e-5, 9.37342e-5, 1.18632e-4]

y_vals = [0.0, 0.1, 0.182, 0.332, 0.604, 1.1, 2.0, 3.64, 6.64, 12.1, 22.0,

39.6, 71.3]

x, y = np.meshgrid(x_vals, y_vals)

x = x.flatten()

y = y.flatten()

ax_test = fig_test.subplots()

ax_test.set_xscale('log')

ax_test.set_yscale('log')

ax_test.margins = 0

ax_test.scatter(x, y)

ax_ref = fig_ref.subplots()

ax_ref.set_xscale('log')

ax_ref.set_yscale('log')

ax_ref.plot(x, y, marker="o", ls="")

def test_quiver_limits():

ax = plt.axes()

x, y = np.arange(8), np.arange(10)

u = v = np.linspace(0, 10, 80).reshape(10, 8)

q = plt.quiver(x, y, u, v)

assert q.get_datalim(ax.transData).bounds == (0., 0., 7., 9.)

plt.figure()

ax = plt.axes()

x = np.linspace(-5, 10, 20)

y = np.linspace(-2, 4, 10)

y, x = np.meshgrid(y, x)

trans = mtransforms.Affine2D().translate(25, 32) + ax.transData

plt.quiver(x, y, np.sin(x), np.cos(y), transform=trans)

assert ax.dataLim.bounds == (20.0, 30.0, 15.0, 6.0)

def test_barb_limits():

ax = plt.axes()

x = np.linspace(-5, 10, 20)

y = np.linspace(-2, 4, 10)

y, x = np.meshgrid(y, x)

trans = mtransforms.Affine2D().translate(25, 32) + ax.transData

plt.barbs(x, y, np.sin(x), np.cos(y), transform=trans)

# The calculated bounds are approximately the bounds of the original data,

# this is because the entire path is taken into account when updating the

# datalim.

assert_array_almost_equal(ax.dataLim.bounds, (20, 30, 15, 6),

decimal=1)

@image_comparison(['EllipseCollection_test_image.png'], remove_text=True,

tol=0 if platform.machine() == 'x86_64' else 0.021)

def test_EllipseCollection():

# Test basic functionality

fig, ax = plt.subplots()

x = np.arange(4)

y = np.arange(3)

X, Y = np.meshgrid(x, y)

XY = np.vstack((X.ravel(), Y.ravel())).T

ww = X / x[-1]

hh = Y / y[-1]

aa = np.ones_like(ww) * 20 # first axis is 20 degrees CCW from x axis

ec = mcollections.EllipseCollection(

ww, hh, aa, units='x', offsets=XY, offset_transform=ax.transData,

facecolors='none')

ax.add_collection(ec)

def test_EllipseCollection_setter_getter():

# Test widths, heights and angle setter

rng = np.random.default_rng(0)

widths = (2, )

heights = (3, )

angles = (45, )

offsets = rng.random((10, 2)) * 10

fig, ax = plt.subplots()

ec = mcollections.EllipseCollection(

widths=widths,

heights=heights,

angles=angles,

offsets=offsets,

units='x',

offset_transform=ax.transData,

)

assert_array_almost_equal(ec._widths, np.array(widths).ravel() * 0.5)

assert_array_almost_equal(ec._heights, np.array(heights).ravel() * 0.5)

assert_array_almost_equal(ec._angles, np.deg2rad(angles).ravel())

assert_array_almost_equal(ec.get_widths(), widths)

assert_array_almost_equal(ec.get_heights(), heights)

assert_array_almost_equal(ec.get_angles(), angles)

ax.add_collection(ec)

ax.set_xlim(-2, 12)

ax.set_ylim(-2, 12)

new_widths = rng.random((10, 2)) * 2

new_heights = rng.random((10, 2)) * 3

new_angles = rng.random((10, 2)) * 180

ec.set(widths=new_widths, heights=new_heights, angles=new_angles)

assert_array_almost_equal(ec.get_widths(), new_widths.ravel())

assert_array_almost_equal(ec.get_heights(), new_heights.ravel())

assert_array_almost_equal(ec.get_angles(), new_angles.ravel())

@image_comparison(['polycollection_close.png'], remove_text=True, style='mpl20')

def test_polycollection_close():

from mpl_toolkits.mplot3d import Axes3D # type: ignore[import]

plt.rcParams['axes3d.automargin'] = True

vertsQuad = [

[[0., 0.], [0., 1.], [1., 1.], [1., 0.]],

[[0., 1.], [2., 3.], [2., 2.], [1., 1.]],

[[2., 2.], [2., 3.], [4., 1.], [3., 1.]],

[[3., 0.], [3., 1.], [4., 1.], [4., 0.]]]

fig = plt.figure()

ax = fig.add_axes(Axes3D(fig))

colors = ['r', 'g', 'b', 'y', 'k']

zpos = list(range(5))

poly = mcollections.PolyCollection(

vertsQuad * len(zpos), linewidth=0.25)

poly.set_alpha(0.7)

# need to have a z-value for *each* polygon = element!

zs = []

cs = []

for z, c in zip(zpos, colors):

zs.extend([z] * len(vertsQuad))

cs.extend([c] * len(vertsQuad))

poly.set_color(cs)

ax.add_collection3d(poly, zs=zs, zdir='y')

# axis limit settings:

ax.set_xlim3d(0, 4)

ax.set_zlim3d(0, 3)

ax.set_ylim3d(0, 4)

@check_figures_equal(extensions=["png"])

def test_scalarmap_change_cmap(fig_test, fig_ref):

# Ensure that changing the colormap of a 3D scatter after draw updates the colors.

x, y, z = np.array(list(itertools.product(

np.arange(0, 5, 1),

np.arange(0, 5, 1),

np.arange(0, 5, 1)

))).T

c = x + y

# test

ax_test = fig_test.add_subplot(111, projection='3d')

sc_test = ax_test.scatter(x, y, z, c=c, s=40, cmap='jet')

fig_test.canvas.draw()

sc_test.set_cmap('viridis')

# ref

ax_ref = fig_ref.add_subplot(111, projection='3d')

ax_ref.scatter(x, y, z, c=c, s=40, cmap='viridis')

@image_comparison(['regularpolycollection_rotate.png'], remove_text=True)

def test_regularpolycollection_rotate():

xx, yy = np.mgrid[:10, :10]

xy_points = np.transpose([xx.flatten(), yy.flatten()])

rotations = np.linspace(0, 2*np.pi, len(xy_points))

fig, ax = plt.subplots()

for xy, alpha in zip(xy_points, rotations):

col = mcollections.RegularPolyCollection(

4, sizes=(100,), rotation=alpha,

offsets=[xy], offset_transform=ax.transData)

ax.add_collection(col)

@image_comparison(['regularpolycollection_scale.png'], remove_text=True)

def test_regularpolycollection_scale():

# See issue #3860

class SquareCollection(mcollections.RegularPolyCollection):

def __init__(self, **kwargs):

super().__init__(4, rotation=np.pi/4., **kwargs)

def get_transform(self):

"""Return transform scaling circle areas to data space."""

ax = self.axes

pts2pixels = 72.0 / ax.get_figure(root=True).dpi

scale_x = pts2pixels * ax.bbox.width / ax.viewLim.width

scale_y = pts2pixels * ax.bbox.height / ax.viewLim.height

return mtransforms.Affine2D().scale(scale_x, scale_y)

fig, ax = plt.subplots()

xy = [(0, 0)]

# Unit square has a half-diagonal of `1/sqrt(2)`, so `pi * r**2` equals...

circle_areas = [np.pi / 2]

squares = SquareCollection(

sizes=circle_areas, offsets=xy, offset_transform=ax.transData)

ax.add_collection(squares)

ax.axis([-1, 1, -1, 1])

def test_picking():

fig, ax = plt.subplots()

col = ax.scatter([0], [0], [1000], picker=True)

fig.savefig(io.BytesIO(), dpi=fig.dpi)

mouse_event = SimpleNamespace(x=325, y=240)

found, indices = col.contains(mouse_event)

assert found

assert_array_equal(indices['ind'], [0])

def test_quadmesh_contains():

x = np.arange(4)

X = x[:, None] * x[None, :]

fig, ax = plt.subplots()

mesh = ax.pcolormesh(X)

fig.draw_without_rendering()

xdata, ydata = 0.5, 0.5

x, y = mesh.get_transform().transform((xdata, ydata))

mouse_event = SimpleNamespace(xdata=xdata, ydata=ydata, x=x, y=y)

found, indices = mesh.contains(mouse_event)

assert found

assert_array_equal(indices['ind'], [0])

xdata, ydata = 1.5, 1.5

x, y = mesh.get_transform().transform((xdata, ydata))

mouse_event = SimpleNamespace(xdata=xdata, ydata=ydata, x=x, y=y)

found, indices = mesh.contains(mouse_event)

assert found

assert_array_equal(indices['ind'], [5])

def test_quadmesh_contains_concave():

# Test a concave polygon, V-like shape

x = [[0, -1], [1, 0]]

y = [[0, 1], [1, -1]]

fig, ax = plt.subplots()

mesh = ax.pcolormesh(x, y, [[0]])

fig.draw_without_rendering()

# xdata, ydata, expected

points = [(-0.5, 0.25, True), # left wing

(0, 0.25, False), # between the two wings

(0.5, 0.25, True), # right wing

(0, -0.25, True), # main body

]

for point in points:

xdata, ydata, expected = point

x, y = mesh.get_transform().transform((xdata, ydata))

mouse_event = SimpleNamespace(xdata=xdata, ydata=ydata, x=x, y=y)

found, indices = mesh.contains(mouse_event)

assert found is expected

def test_quadmesh_cursor_data():

x = np.arange(4)

X = x[:, None] * x[None, :]

fig, ax = plt.subplots()

mesh = ax.pcolormesh(X)

# Empty array data

mesh._A = None

fig.draw_without_rendering()

xdata, ydata = 0.5, 0.5

x, y = mesh.get_transform().transform((xdata, ydata))

mouse_event = SimpleNamespace(xdata=xdata, ydata=ydata, x=x, y=y)

# Empty collection should return None

assert mesh.get_cursor_data(mouse_event) is None

# Now test adding the array data, to make sure we do get a value

mesh.set_array(np.ones(X.shape))

assert_array_equal(mesh.get_cursor_data(mouse_event), [1])

def test_quadmesh_cursor_data_multiple_points():

x = [1, 2, 1, 2]

fig, ax = plt.subplots()

mesh = ax.pcolormesh(x, x, np.ones((3, 3)))

fig.draw_without_rendering()

xdata, ydata = 1.5, 1.5

x, y = mesh.get_transform().transform((xdata, ydata))

mouse_event = SimpleNamespace(xdata=xdata, ydata=ydata, x=x, y=y)

# All quads are covering the same square

assert_array_equal(mesh.get_cursor_data(mouse_event), np.ones(9))

def test_linestyle_single_dashes():

plt.scatter([0, 1, 2], [0, 1, 2], linestyle=(0., [2., 2.]))

plt.draw()

@image_comparison(['size_in_xy.png'], remove_text=True)

def test_size_in_xy():

fig, ax = plt.subplots()

widths, heights, angles = (10, 10), 10, 0

widths = 10, 10

coords = [(10, 10), (15, 15)]

e = mcollections.EllipseCollection(

widths, heights, angles, units='xy',

offsets=coords, offset_transform=ax.transData)

ax.add_collection(e)

ax.set_xlim(0, 30)

ax.set_ylim(0, 30)

def test_pandas_indexing(pd):

# Should not fail break when faced with a

# non-zero indexed series

index = [11, 12, 13]

ec = fc = pd.Series(['red', 'blue', 'green'], index=index)

lw = pd.Series([1, 2, 3], index=index)

ls = pd.Series(['solid', 'dashed', 'dashdot'], index=index)

aa = pd.Series([True, False, True], index=index)

Collection(edgecolors=ec)

Collection(facecolors=fc)

Collection(linewidths=lw)

Collection(linestyles=ls)

Collection(antialiaseds=aa)

@mpl.style.context('default')

def test_lslw_bcast():

col = mcollections.PathCollection([])

col.set_linestyles(['-', '-'])

col.set_linewidths([1, 2, 3])

assert col.get_linestyles() == [(0, None)] * 6

assert col.get_linewidths() == [1, 2, 3] * 2

col.set_linestyles(['-', '-', '-'])

assert col.get_linestyles() == [(0, None)] * 3

assert (col.get_linewidths() == [1, 2, 3]).all()

def test_set_wrong_linestyle():

c = Collection()

with pytest.raises(ValueError, match="Do not know how to convert 'fuzzy'"):

c.set_linestyle('fuzzy')

@mpl.style.context('default')

def test_capstyle():

col = mcollections.PathCollection([])

assert col.get_capstyle() is None

col = mcollections.PathCollection([], capstyle='round')

assert col.get_capstyle() == 'round'

col.set_capstyle('butt')

assert col.get_capstyle() == 'butt'

@mpl.style.context('default')

def test_joinstyle():

col = mcollections.PathCollection([])

assert col.get_joinstyle() is None

col = mcollections.PathCollection([], joinstyle='round')

assert col.get_joinstyle() == 'round'

col.set_joinstyle('miter')

assert col.get_joinstyle() == 'miter'

@image_comparison(['cap_and_joinstyle.png'])

def test_cap_and_joinstyle_image():

fig, ax = plt.subplots()

ax.set_xlim([-0.5, 1.5])

ax.set_ylim([-0.5, 2.5])

x = np.array([0.0, 1.0, 0.5])

ys = np.array([[0.0], [0.5], [1.0]]) + np.array([[0.0, 0.0, 1.0]])

segs = np.zeros((3, 3, 2))

segs[:, :, 0] = x

segs[:, :, 1] = ys

line_segments = LineCollection(segs, linewidth=[10, 15, 20])

line_segments.set_capstyle("round")

line_segments.set_joinstyle("miter")

ax.add_collection(line_segments)

ax.set_title('Line collection with customized caps and joinstyle')

@image_comparison(['scatter_post_alpha.png'],

remove_text=True, style='default')

def test_scatter_post_alpha():

fig, ax = plt.subplots()

sc = ax.scatter(range(5), range(5), c=range(5))

sc.set_alpha(.1)

def test_scatter_alpha_array():

x = np.arange(5)

alpha = x / 5

# With colormapping.

fig, (ax0, ax1) = plt.subplots(2)

sc0 = ax0.scatter(x, x, c=x, alpha=alpha)

sc1 = ax1.scatter(x, x, c=x)

sc1.set_alpha(alpha)

plt.draw()

assert_array_equal(sc0.get_facecolors()[:, -1], alpha)

assert_array_equal(sc1.get_facecolors()[:, -1], alpha)

# Without colormapping.

fig, (ax0, ax1) = plt.subplots(2)

sc0 = ax0.scatter(x, x, color=['r', 'g', 'b', 'c', 'm'], alpha=alpha)

sc1 = ax1.scatter(x, x, color='r', alpha=alpha)

plt.draw()

assert_array_equal(sc0.get_facecolors()[:, -1], alpha)

assert_array_equal(sc1.get_facecolors()[:, -1], alpha)

# Without colormapping, and set alpha afterward.

fig, (ax0, ax1) = plt.subplots(2)

sc0 = ax0.scatter(x, x, color=['r', 'g', 'b', 'c', 'm'])

sc0.set_alpha(alpha)

sc1 = ax1.scatter(x, x, color='r')

sc1.set_alpha(alpha)

plt.draw()

assert_array_equal(sc0.get_facecolors()[:, -1], alpha)

assert_array_equal(sc1.get_facecolors()[:, -1], alpha)

def test_pathcollection_legend_elements():

np.random.seed(19680801)

x, y = np.random.rand(2, 10)

y = np.random.rand(10)

c = np.random.randint(0, 5, size=10)

s = np.random.randint(10, 300, size=10)

fig, ax = plt.subplots()

sc = ax.scatter(x, y, c=c, s=s, cmap="jet", marker="o", linewidths=0)

h, l = sc.legend_elements(fmt="{x:g}")

assert len(h) == 5

assert l == ["0", "1", "2", "3", "4"]

colors = np.array([line.get_color() for line in h])

colors2 = sc.cmap(np.arange(5)/4)

assert_array_equal(colors, colors2)

l1 = ax.legend(h, l, loc=1)

h2, lab2 = sc.legend_elements(num=9)

assert len(h2) == 9

l2 = ax.legend(h2, lab2, loc=2)

h, l = sc.legend_elements(prop="sizes", alpha=0.5, color="red")

assert all(line.get_alpha() == 0.5 for line in h)

assert all(line.get_markerfacecolor() == "red" for line in h)

l3 = ax.legend(h, l, loc=4)

h, l = sc.legend_elements(prop="sizes", num=4, fmt="{x:.2f}",

func=lambda x: 2*x)

actsizes = [line.get_markersize() for line in h]

labeledsizes = np.sqrt(np.array(l, float) / 2)

assert_array_almost_equal(actsizes, labeledsizes)

l4 = ax.legend(h, l, loc=3)

loc = mpl.ticker.MaxNLocator(nbins=9, min_n_ticks=9-1,

steps=[1, 2, 2.5, 3, 5, 6, 8, 10])

h5, lab5 = sc.legend_elements(num=loc)

assert len(h2) == len(h5)

levels = [-1, 0, 55.4, 260]

h6, lab6 = sc.legend_elements(num=levels, prop="sizes", fmt="{x:g}")

assert [float(l) for l in lab6] == levels[2:]

for l in [l1, l2, l3, l4]:

ax.add_artist(l)

fig.canvas.draw()

def test_EventCollection_nosort():

# Check that EventCollection doesn't modify input in place

arr = np.array([3, 2, 1, 10])

coll = EventCollection(arr)

np.testing.assert_array_equal(arr, np.array([3, 2, 1, 10]))

def test_collection_set_verts_array():

verts = np.arange(80, dtype=np.double).reshape(10, 4, 2)

col_arr = PolyCollection(verts)

col_list = PolyCollection(list(verts))

assert len(col_arr._paths) == len(col_list._paths)

for ap, lp in zip(col_arr._paths, col_list._paths):

assert np.array_equal(ap._vertices, lp._vertices)

assert np.array_equal(ap._codes, lp._codes)

verts_tuple = np.empty(10, dtype=object)

verts_tuple[:] = [tuple(tuple(y) for y in x) for x in verts]

col_arr_tuple = PolyCollection(verts_tuple)

assert len(col_arr._paths) == len(col_arr_tuple._paths)

for ap, atp in zip(col_arr._paths, col_arr_tuple._paths):

assert np.array_equal(ap._vertices, atp._vertices)

assert np.array_equal(ap._codes, atp._codes)

@check_figures_equal()

@pytest.mark.parametrize("kwargs", [{}, {"step": "pre"}])

def test_fill_between_poly_collection_set_data(fig_test, fig_ref, kwargs):

t = np.linspace(0, 16)

f1 = np.sin(t)

f2 = f1 + 0.2

fig_ref.subplots().fill_between(t, f1, f2, **kwargs)

coll = fig_test.subplots().fill_between(t, -1, 1.2, **kwargs)

coll.set_data(t, f1, f2)

@pytest.mark.parametrize(("t_direction", "f1", "shape", "where", "msg"), [

("z", None, None, None, r"t_direction must be 'x' or 'y', got 'z'"),

("x", None, (-1, 1), None, r"'x' is not 1-dimensional"),

("x", None, None, [False] * 3, r"where size \(3\) does not match 'x' size \(\d+\)"),

("y", [1, 2], None, None, r"'y' has size \d+, but 'x1' has an unequal size of \d+"),

])

def test_fill_between_poly_collection_raise(t_direction, f1, shape, where, msg):

t = np.linspace(0, 16)

f1 = np.sin(t) if f1 is None else np.asarray(f1)

f2 = f1 + 0.2

if shape:

t = t.reshape(*shape)

with pytest.raises(ValueError, match=msg):

FillBetweenPolyCollection(t_direction, t, f1, f2, where=where)

def test_collection_set_array():

vals = [*range(10)]

# Test set_array with list

c = Collection()

c.set_array(vals)

# Test set_array with wrong dtype

with pytest.raises(TypeError, match="^Image data of dtype"):

c.set_array("wrong_input")

# Test if array kwarg is copied

vals[5] = 45

assert np.not_equal(vals, c.get_array()).any()

def test_blended_collection_autolim():

f, ax = plt.subplots()

# sample data to give initial data limits

ax.plot([2, 3, 4], [0.4, 0.6, 0.5])

np.testing.assert_allclose((ax.dataLim.xmin, ax.dataLim.xmax), (2, 4))

data_ymin, data_ymax = ax.dataLim.ymin, ax.dataLim.ymax

# LineCollection with vertical lines spanning the Axes vertical, using transAxes

x = [1, 2, 3, 4, 5]

vertical_lines = [np.array([[xi, 0], [xi, 1]]) for xi in x]

trans = mtransforms.blended_transform_factory(ax.transData, ax.transAxes)

ax.add_collection(LineCollection(vertical_lines, transform=trans))

# check that the x data limits are updated to include the LineCollection

np.testing.assert_allclose((ax.dataLim.xmin, ax.dataLim.xmax), (1, 5))

# check that the y data limits are not updated (because they are not transData)

np.testing.assert_allclose((ax.dataLim.ymin, ax.dataLim.ymax),

(data_ymin, data_ymax))

def test_singleton_autolim():

fig, ax = plt.subplots()

ax.scatter(0, 0)

np.testing.assert_allclose(ax.get_ylim(), [-0.06, 0.06])

np.testing.assert_allclose(ax.get_xlim(), [-0.06, 0.06])

@pytest.mark.parametrize("transform, expected", [

("transData", (-0.5, 3.5)),

("transAxes", (2.8, 3.2)),

])

def test_autolim_with_zeros(transform, expected):

# 1) Test that a scatter at (0, 0) data coordinates contributes to

# autoscaling even though any(offsets) would be False in that situation.

# 2) Test that specifying transAxes for the transform does not contribute

# to the autoscaling.

fig, ax = plt.subplots()

ax.scatter(0, 0, transform=getattr(ax, transform))

ax.scatter(3, 3)

np.testing.assert_allclose(ax.get_ylim(), expected)

np.testing.assert_allclose(ax.get_xlim(), expected)

def test_quadmesh_set_array_validation(pcfunc):

x = np.arange(11)

y = np.arange(8)

z = np.random.random((7, 10))

fig, ax = plt.subplots()

coll = getattr(ax, pcfunc)(x, y, z)

with pytest.raises(ValueError, match=re.escape(

"For X (11) and Y (8) with flat shading, A should have shape "

"(7, 10, 3) or (7, 10, 4) or (7, 10) or (70,), not (10, 7)")):

coll.set_array(z.reshape(10, 7))

z = np.arange(54).reshape((6, 9))

with pytest.raises(ValueError, match=re.escape(

"For X (11) and Y (8) with flat shading, A should have shape "

"(7, 10, 3) or (7, 10, 4) or (7, 10) or (70,), not (6, 9)")):

coll.set_array(z)

with pytest.raises(ValueError, match=re.escape(

"For X (11) and Y (8) with flat shading, A should have shape "

"(7, 10, 3) or (7, 10, 4) or (7, 10) or (70,), not (54,)")):

coll.set_array(z.ravel())

# RGB(A) tests

z = np.ones((9, 6, 3)) # RGB with wrong X/Y dims

with pytest.raises(ValueError, match=re.escape(

"For X (11) and Y (8) with flat shading, A should have shape "

"(7, 10, 3) or (7, 10, 4) or (7, 10) or (70,), not (9, 6, 3)")):

coll.set_array(z)

z = np.ones((9, 6, 4)) # RGBA with wrong X/Y dims

with pytest.raises(ValueError, match=re.escape(

"For X (11) and Y (8) with flat shading, A should have shape "

"(7, 10, 3) or (7, 10, 4) or (7, 10) or (70,), not (9, 6, 4)")):

coll.set_array(z)

z = np.ones((7, 10, 2)) # Right X/Y dims, bad 3rd dim

with pytest.raises(ValueError, match=re.escape(

"For X (11) and Y (8) with flat shading, A should have shape "

"(7, 10, 3) or (7, 10, 4) or (7, 10) or (70,), not (7, 10, 2)")):

coll.set_array(z)

x = np.arange(10)

y = np.arange(7)

z = np.random.random((7, 10))

fig, ax = plt.subplots()

coll = ax.pcolormesh(x, y, z, shading='gouraud')

def test_polyquadmesh_masked_vertices_array():

xx, yy = np.meshgrid([0, 1, 2], [0, 1, 2, 3])

# 2 x 3 mesh data

zz = (xx*yy)[:-1, :-1]

quadmesh = plt.pcolormesh(xx, yy, zz)

quadmesh.update_scalarmappable()

quadmesh_fc = quadmesh.get_facecolor()[1:, :]

# Mask the origin vertex in x

xx = np.ma.masked_where((xx == 0) & (yy == 0), xx)

polymesh = plt.pcolor(xx, yy, zz)