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"""
Tests specific to the patches module.
"""
import numpy as np
from numpy.testing import assert_array_equal
from numpy.testing import assert_almost_equal
from matplotlib.patches import Polygon
from matplotlib.patches import Rectangle
from matplotlib.testing.decorators import image_comparison
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches
import matplotlib.collections as mcollections
from matplotlib import path as mpath
from matplotlib import transforms as mtrans
def test_Polygon_close():
"""
Github issue #1018 identified a bug in the Polygon handling
of the closed attribute; the path was not getting closed
when set_xy was used to set the vertices.
"""
# open set of vertices:
xy = [[0,0], [0,1], [1,1]]
# closed set:
xyclosed = xy + [[0,0]]
# start with open path and close it:
p = Polygon(xy, closed=True)
assert_array_equal(p.get_xy(), xyclosed)
p.set_xy(xy)
assert_array_equal(p.get_xy(), xyclosed)
# start with closed path and open it:
p = Polygon(xyclosed, closed=False)
assert_array_equal(p.get_xy(), xy)
p.set_xy(xyclosed)
assert_array_equal(p.get_xy(), xy)
# start with open path and leave it open:
p = Polygon(xy, closed=False)
assert_array_equal(p.get_xy(), xy)
p.set_xy(xy)
assert_array_equal(p.get_xy(), xy)
# start with closed path and leave it closed:
p = Polygon(xyclosed, closed=True)
assert_array_equal(p.get_xy(), xyclosed)
p.set_xy(xyclosed)
assert_array_equal(p.get_xy(), xyclosed)
def test_rotate_rect():
loc = np.asarray([1.0, 2.0])
width = 2
height = 3
angle = 30.0
# A rotated rectangle
rect1 = Rectangle(loc, width, height, angle=angle)
# A non-rotated rectangle
rect2 = Rectangle(loc, width, height)
# Set up an explicit rotation matrix (in radians)
angle_rad = np.pi * angle / 180.0
rotation_matrix = np.array([[np.cos(angle_rad), -np.sin(angle_rad)],
[np.sin(angle_rad), np.cos(angle_rad)]])
# Translate to origin, rotate each vertex, and then translate back
new_verts = np.inner(rotation_matrix, rect2.get_verts() - loc).T + loc
# They should be the same
assert_almost_equal(rect1.get_verts(), new_verts)
@image_comparison(baseline_images=['clip_to_bbox'])
def test_clip_to_bbox():
fig = plt.figure()
ax = fig.add_subplot(111)
ax.set_xlim([-18, 20])
ax.set_ylim([-150, 100])
path = mpath.Path.unit_regular_star(8).deepcopy()
path.vertices *= [10, 100]
path.vertices -= [5, 25]
path2 = mpath.Path.unit_circle().deepcopy()
path2.vertices *= [10, 100]
path2.vertices += [10, -25]
combined = mpath.Path.make_compound_path(path, path2)
patch = mpatches.PathPatch(
combined, alpha=0.5, facecolor='coral', edgecolor='none')
ax.add_patch(patch)
bbox = mtrans.Bbox([[-12, -77.5], [50, -110]])
result_path = combined.clip_to_bbox(bbox)
result_patch = mpatches.PathPatch(
result_path, alpha=0.5, facecolor='green', lw=4, edgecolor='black')
ax.add_patch(result_patch)
@image_comparison(baseline_images=['patch_alpha_coloring'], remove_text=True)
def test_patch_alpha_coloring():
"""
Test checks that the patch and collection are rendered with the specified
alpha values in their facecolor and edgecolor.
"""
star = mpath.Path.unit_regular_star(6)
circle = mpath.Path.unit_circle()
# concatenate the star with an internal cutout of the circle
verts = np.concatenate([circle.vertices, star.vertices[::-1]])
codes = np.concatenate([circle.codes, star.codes])
cut_star1 = mpath.Path(verts, codes)
cut_star2 = mpath.Path(verts + 1, codes)
ax = plt.axes()
patch = mpatches.PathPatch(cut_star1,
linewidth=5, linestyle='dashdot',
facecolor=(1, 0, 0, 0.5),
edgecolor=(0, 0, 1, 0.75))
ax.add_patch(patch)
col = mcollections.PathCollection([cut_star2],
linewidth=5, linestyles='dashdot',
facecolor=(1, 0, 0, 0.5),
edgecolor=(0, 0, 1, 0.75))
ax.add_collection(col)
ax.set_xlim([-1, 2])
ax.set_ylim([-1, 2])
@image_comparison(baseline_images=['patch_alpha_override'], remove_text=True)
def test_patch_alpha_override():
"""
Test checks that specifying an alpha attribute for a patch or collection
will override any alpha component of the facecolor or edgecolor.
"""
star = mpath.Path.unit_regular_star(6)
circle = mpath.Path.unit_circle()
# concatenate the star with an internal cutout of the circle
verts = np.concatenate([circle.vertices, star.vertices[::-1]])
codes = np.concatenate([circle.codes, star.codes])
cut_star1 = mpath.Path(verts, codes)
cut_star2 = mpath.Path(verts + 1, codes)
ax = plt.axes()
patch = mpatches.PathPatch(cut_star1,
linewidth=5, linestyle='dashdot',
alpha=0.25,
facecolor=(1, 0, 0, 0.5),
edgecolor=(0, 0, 1, 0.75))
ax.add_patch(patch)
col = mcollections.PathCollection([cut_star2],
linewidth=5, linestyles='dashdot',
alpha=0.25,
facecolor=(1, 0, 0, 0.5),
edgecolor=(0, 0, 1, 0.75))
ax.add_collection(col)
ax.set_xlim([-1, 2])
ax.set_ylim([-1, 2])
@image_comparison(baseline_images=['patch_custom_linestyle'], remove_text=True)
def test_patch_custom_linestyle():
"""
A test to check that patches and collections accept custom dash patterns
as linestyle and that they display correctly.
"""
star = mpath.Path.unit_regular_star(6)
circle = mpath.Path.unit_circle()
# concatenate the star with an internal cutout of the circle
verts = np.concatenate([circle.vertices, star.vertices[::-1]])
codes = np.concatenate([circle.codes, star.codes])
cut_star1 = mpath.Path(verts, codes)
cut_star2 = mpath.Path(verts + 1, codes)
ax = plt.axes()
patch = mpatches.PathPatch(cut_star1,
linewidth=5, linestyle=(0.0, (5.0, 7.0, 10.0, 7.0)),
facecolor=(1, 0, 0),
edgecolor=(0, 0, 1))
ax.add_patch(patch)
col = mcollections.PathCollection([cut_star2],
linewidth=5, linestyles=[(0.0, (5.0, 7.0, 10.0, 7.0))],
facecolor=(1, 0, 0),
edgecolor=(0, 0, 1))
ax.add_collection(col)
ax.set_xlim([-1, 2])
ax.set_ylim([-1, 2])
if __name__=='__main__':
import nose
nose.runmodule(argv=['-s','--with-doctest'], exit=False)
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